JP6524032B2 - How to handle flushing drainage - Google Patents

Description

  The present invention relates to a method of treating flushing drainage.

With flushing, iron powder, cutting oil, zinc oxide, joining material, etc. generated by connecting, cutting and welding work of piping before trial operation of air conditioning equipment, water supply / hot water supply equipment, plant, other piping system etc. In order to remove from the system, it is to flow and clean the fluid in the piping, and the method is
(1) Method to put water in the pipe as it is and drain it as it is (2) Method to put in water after circulation and then drain it out (3) There is a method to make small amount of water flow in pipe by increasing flow velocity by suction etc. is there.

  No matter which of these methods is used to flush the piping, flushing drainage from the piping system of the facility with the galvanized steel pipe contains high concentrations of zinc, oil used during manufacturing and screw processing, and a trace amount of heavy metal It is done. When flushing drainage from the piping system of a facility to which such galvanized steel pipes are piped, zinc is the main component that exceeds the drainage regulation value, and oil (detected as a normal hexane extract), and others Heavy metals are also rarely above regulatory limits.

  Flushing drainage containing zinc, oil, and heavy metals above the regulation level can not be discharged as it is, so it is generally diluted and then discharged outside the site, and under the present circumstances, zinc removal treatment is performed. There are very few cases where they are discharged. Therefore, there is no direct existing technology for removing zinc in the flushing drainage from the piping system of the facility piping the galvanized steel pipe (Non-patent Document 1).

Association of Air Conditioning and Sanitation Engineering Construction Maintenance Committee "Study and research on improvement of construction maintenance information and air conditioning piping system reliability" March 2009

  As described above, conventionally, there is a problem because flushing drainage is discharged after being subjected to dilution treatment.

  The present invention has been made in view of such a point, and when the flushing drainage from the piping system is treated, the flushing drainage is circulated between the system for treating the flushing drainage and the piping system. The purpose is to solve the problem.

In order to achieve the above object, the present invention is a method of treating flushing drainage from the piping system when flushing piping system for water for air conditioning in an air conditioning facility with water, and filtering the flushing drainage. A system having a filter is connected to the piping system, circulating flushing drainage between the piping system and the system, treating the flushing drainage with the system, and then returning it back to the piping system, and then the system It is characterized in that the treated water removed from the piping system and returned into the piping system is used as it is as water for air conditioning in the piping system .

  In such a case, the flushing drainage may be circulated several times through the piping system and the system, and then the system may be removed from the piping system.

When the measurement result of the turbidity of the treated water becomes equal to or more than a predetermined value, the treated water may not be discharged out of the system.

  According to the present invention, the system for treating the flushing drainage is connected to the piping system, and after the flushing drainage is treated by the system, it is returned to the piping system again. Therefore, the system and the piping system for treating the flushing drainage Between which the flushing drainage can be circulated.

It is a graph which shows correlation with the turbidity of flushing drainage, and a zinc concentration. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which showed the outline of the system | strain of a system typically. It is a graph which shows the relationship between a treated water amount and zinc concentration. It is a graph which shows the example of control of the amount of coagulating agents and the amount of return sludge based on inflow water turbidity. It is the graph which showed the relationship between the amount of treated water and the zinc concentration about the presence or absence of return of a precipitate. It is a graph which shows the other control example of the amount of coagulating agents and the amount of return sludge based on inflow water turbidity. It is explanatory drawing which showed typically the outline of the system | strain of other systems. It is the graph which showed the relationship between the suspended matter density | concentration and zinc concentration about the flushing drainage (raw water) and treated water, respectively.

  With regard to flushing drainage containing zinc, oil, and heavy metals above the above-mentioned drainage regulation value, the following techniques have conventionally been proposed as a general method for treating zinc-containing drainage. That is, after subjecting the zinc-containing wastewater to an alkali treatment first, an inorganic coagulant is added, and then a polymer flocculant is added to separate the sludge in the sedimentation tank, and in some cases, after filtration, the treated water The method is to neutralize the pH of the solution to the wastewater treatment standard and drain it (JP-A-58-19498, JP-A-11-188208, JP-A-11-290865).

  All of these prior art technologies supply coagulant quantitatively, and if there is a change in inflow concentration, it is assumed that the most concentrated drainage flows in, and the amount of coagulant and flocculant corresponding to it is added There is a need to.

  That is, in order to supply an appropriate amount of coagulant and coagulant, it is sufficient to directly measure the zinc concentration and add an appropriate amount of the coagulant in proportion to the concentration. The fact is that there is no simple way to measure the concentration of zinc in waste water. Methods of analyzing zinc in JIS include flame atomic absorption, electric heating atomic absorption, ICP emission spectrometry, and ICP mass spectrometry, all of which are suitable for continuous analysis since the analyzer is expensive. Not. Moreover, although there is a colorimetric method as a simple analysis method, analysis can not be performed continuously either.

  Therefore, under the existing technology, there is only a way to quantitatively supply the coagulant, and as a result, even if drainage water with a low zinc concentration flows in during the process, an excess of the coagulant will be introduced, which is essentially necessary. The amount of generated sludge was also large because the amount of the coagulant was higher than that of the coagulant. Since zinc aggregates have poor settling properties, the addition amount of the coagulant and the coagulant is often added in view of safety, and the amount of generated sludge is further increased.

  In this regard, it is possible to easily estimate the concentration of zinc in the flushing drainage from the piping system of the installation piping the galvanized steel pipe, and based on that, it is preferable to appropriately control the addition amount of the coagulant and the coagulant.

  Therefore, the present inventor analyzed flushing drainage discharged from various facilities for various items, found items correlated with the zinc concentration, and found that it was possible to estimate the zinc concentration easily and continuously. . That is, it has been found that there is a correlation between the concentration of zinc in the flushing drainage from the piping system of the facility piping the galvanized steel pipe and the turbidity.

  FIG. 1 shows the result. The zinc concentration was measured using a Varian ICP emission spectrometer 720-ES, and the turbidity was measured using a HACH turbidity color meter 2100AN. According to the results shown in FIG. 1, regardless of the raw water of the flushing drainage and the treated water after the treatment, the turbidity and the zinc concentration in the flushing drainage of the piping system made of galvanized steel pipe are in a proportional relationship, It was found that there was a correlation of .99.

  Moreover, it was also confirmed that there was a correlation between the zinc concentration and the turbidity even when the flushing method was different. Therefore, by measuring the turbidity and the zinc concentration in advance and knowing the correlation thereof, the zinc concentration can be determined promptly and continuously from the turbidity of the treated raw water or the treated water after the treatment.

  Moreover, since the component ratio of the flushing drainage from the piping system which consists of galvanized steel pipes is almost always uniform at any equipment, it is considered that there is a correlation between the zinc concentration and the turbidity, which is different from other zinc-containing drainages. It is considered to be unique to flushing drainage of piping system of galvanized steel pipe. For example, unlike flushing wastewater, zinc-containing wastewater discharged from a plating plant, a zinc smelting factory, etc. varies in composition depending on the manufacturing factory, and since the wastewater generated in various processes is mixed at the discharge port, the zinc concentration The correlation between the turbidity and the turbidity differs from day to day, and substances other than zinc often affect the turbidity, and often there is no correlation between the zinc concentration and the turbidity.

  The following description of the embodiment is directed to a system, a method for treating flushing drainage, which has been made in view of such findings.

  FIG. 2 shows an outline of a system of a treatment system for carrying out the method of treating flushing drainage, and flushing drainage from a piping system of a facility having a galvanized steel pipe, such as a galvanized steel pipe, is an inflow pipe 1 From the inlet pump 2 into the system.

Then, pH adjustment is performed on the flushing drainage in the pH adjustment tank 11 first. The pH adjustment is carried out by supplying a pH adjusting agent into the pH adjusting tank 11 from the pH adjusting agent supply source (not shown) by the pump 12 and stirring by the stirring device 13 provided in the pH adjusting tank 11 . The input amount of the pH adjusting agent is controlled based on the pH value by the pH measuring device 14 provided in the pH adjusting tank 11. For example, the operation of the pump 12 is performed so that the pH is 8.5 to 11.0. It is controlled. As a pH adjuster (alkali), known alkali chemicals such as sodium hydroxide (NaOH), slaked lime (Ca (OH) ₂ ), soda ash (Na ₂ CO ₃ ) and the like can be used.

  The wastewater after pH adjustment in the pH adjustment tank 11 is subjected to a condensation treatment in a condensation tank 21. An inorganic coagulant is supplied to the coagulating tank 21 from an inorganic coagulant supply source (not shown) by a pump 22 and is agitated by an agitator 23 provided in the condensing tank 21. As a coagulant, an iron-based coagulant is preferable, and any of ferrous sulfate, ferric sulfate, ferric chloride, copperous chloride, polyferric chloride, polyiron sulfate, iron-silica inorganic polymer coagulant Or in combination. In addition, although the coagulation performance is inferior to that of an iron-based coagulant, an aluminum-based coagulant such as PAC (polyaluminum chloride) or a sulfuric acid band (aluminum sulfate) may be used.

  The waste water subjected to the condensation treatment in the coagulation tank 21 is subjected to the aggregation treatment in the aggregation tank 31. The polymer flocculant is supplied to the flocculation tank 31 from a polymer flocculant supply source (not shown) by a pump 32 and is stirred by a stirring device 33 provided in the flocculation tank 31. An anionic flocculant is preferred as the polymer flocculant. In addition to the coagulant, known flocculation aids such as activated silica, powdered activated carbon, bentonite, sodium alginate and the like may be added, but according to the method of the present invention, only the coagulant and coagulant are drainage standard values. The necessity is low because it is possible to process up to the following.

  Then, the waste water subjected to the aggregation treatment in the aggregation tank 31 is transferred to the sedimentation tank 41. The precipitate (sludge) deposited in the settling tank 41 can be returned to the front side of the pH adjusting tank 11 through the return pipe 43 by the pump 42. A discharge pipe 44 is branch-connected to the return pipe 43. The return pipe 43 and the discharge pipe 44 are provided with valves 43a and 44a, respectively. Further, the supernatant water of the settling tank 41 is sent to the pH adjusting tank 51 on the downstream side of the system through the pipe 45. The piping 45 is provided with an outflow valve 45 a.

In the pH adjustment tank 51, a pH adjuster (acid) is supplied into the pH adjustment tank 51 by a pump 52 from a pH adjuster supply source (not shown), and a stirring device 53 provided in the pH adjustment tank 51. Is stirred. The input amount of the pH adjusting agent is controlled based on the pH value by the pH measuring device 54 provided in the pH adjusting tank 51. For example, the operation of the pump 52 is performed such that the pH is 5.8 to 8.6. It is controlled. As a pH adjuster (acid), commonly known acids such as sulfuric acid H ₂ SO ₄ , hydrochloric acid HCl, carbon dioxide CO _{2 and the} like can be used.

  A return pipe 46 for returning the drainage (supernatant water) of the sedimentation tank 41, ie, the treated water after aggregation treatment, to the inflow pipe 1 is branched and connected to the pipe 45, and the pH adjustment tank 11 is operated by the return pump 47. It is possible to return the treated water from the piping 45 to the front side of. The return pipe 46 is provided with a return valve 46 a. Treated water can be reprocessed by this.

  In the system example of FIG. 2, a turbidimeter A is provided on the downstream side of the connection point of the inflow pipe 1 with the return pipe 46 and on the upstream side of the connection point with the return pipe 43. A turbidity meter B is provided on the outlet side of the drainage (supernatant water), that is, on the settling tank 41 side of the pipe 45.

  The measurement results of the respective turbidity meters A and B are output to the control device Z, and the control device Z determines the inflow pump 2, the pumps 22, 32, 42 based on the correlation of the turbidity-zinc concentration previously obtained. , Valves 43a and 44a, outflow valve 45a, return valve 46a, return pump 47 and the like.

  According to this system, the turbidity of the flushing drainage flowing in from the inflow pipe 1 is continuously measured by the turbidity meter A, and the amount of the coagulant introduced into the coagulation tank 21 and the amount of the coagulant introduced into the aggregation tank 31 It can be adjusted immediately. For example, if the turbidity of the flushing drainage is high, that is, if the zinc concentration is high, the amount of coagulant can be increased, and if it is low, the amount of coagulant can be controlled, thereby preventing wasteful introduction of the coagulant can do.

  In addition, the turbidity of the treated water (supernatant water) from the sedimentation tank 41 is continuously measured by the turbidity meter B, and when the turbidity reaches a certain value or more, the inflow pump 2 is stopped, the outflow valve 45a is closed, and returned It is also possible to perform a series of operations such as opening the valve 46a and turning on the operation of the return pump 47. As a result, the zinc concentration of discharged water was 0.5 mg / L or less, and could be treated constantly. The results are shown in the table of FIG.

  By the way, in the flocculation method, since the suspended matter which is not dissolved in water becomes the nucleus of the aggregate, the larger the suspended matter is, the more easily flocculated and precipitated. In this regard, in the system of FIG. 2, the pump 42 is controlled based on the turbidity of the flushing drainage measured by the turbidity meter A, and the amount of sediment (sludge) returned from the settling tank 41 through the return pipe 43 Can be controlled. Due to the control of the amount of sediment (sludge) returned, the returned sediment becomes a nucleus for aggregation, enabling stable aggregation and sedimentation. In addition, particularly when the zinc concentration of the flushing drainage is low, the amount of aggregates is small and aggregation and precipitation become difficult. When the turbidity of the inflow flushing drainage measured by the turbidity meter A is lower than a predetermined value, that is, the zinc concentration is thinner than the predetermined value, the pump 42 is operated and the pH adjustment tank through the return pipe 43 from the sedimentation tank 41 The amount of sediment (sludge) returned to the front side of 11 can be controlled to increase as the concentration of zinc decreases.

  FIG. 4 schematically shows the relationship between the influent water turbidity, the input amount of the coagulant, and the return amount of the precipitate (sludge) with regard to the control of the input amount of the coagulant and the control of the return amount of the precipitate (sludge) described above. It is As shown in FIG. 4, when the turbidity of the inflow flushing drainage is below a predetermined value, the amount of returned sludge was increased as the turbidity was lower, and the amount of returned sludge was controlled as the turbidity was higher. When the turbidity was equal to or higher than a predetermined value, control was performed to reduce the amount of returned sludge as the turbidity was lower and to increase the amount of returned sludge as the turbidity was higher. In addition, as described later, an upper limit is provided for the amount of returned sludge. As a predetermined value, for example, about 10 to 30 NTU (corresponding to 3 to 10 mg / L in zinc concentration) can be exemplified.

  By carrying out such control of the amount of sediment returned, the zinc concentration in the inflow flushing drainage is thin, and as a result, even if the additive coagulant is small, the zinc concentration in the discharge water is constant at 0.5 mg / L or less. I was able to handle it. When the return amount control was not performed when the zinc concentration of the inflow flushing drainage was low, the amount of the added coagulant was small, and therefore sufficient zinc removal was not performed. The results are shown in the table of FIG.

  In such an example, by measuring the turbidity of the flushing drainage with the turbidimeter A, the required amount of sediment (sludge) returned can be determined, so the amount of return can be variably controlled. Therefore, depending on the state of treatment, if it is possible to remove zinc without mixing the precipitate in the settling tank 41 with the inflow flushing drainage, to mix the sediment in the settling tank 41 into the inflow flushing drainage The pump 42 does not have to be operated, and the power of the pump 42 can be saved.

  In addition, if the amount of return water increases and the amount of inflowing water to the settling tank 41 increases too much, the load on the settling tank 41 increases and the settling property of the precipitate (sludge) is deteriorated and the sludge flows out. An upper limit may be placed on the amount of return through tube 43.

  In addition, when the turbidity of the flushing drainage is low, that is, when the zinc concentration is low, since there are few suspended solids that form nuclei of aggregates, condensation is performed as described above (when the zinc concentration is low, the amount of coagulant is reduced). If the amount of the agent is reduced, the cohesion is deteriorated, but the cohesion becomes good by increasing the amount of returned sediment (sludge). In this way, the amount of sludge generated can be reduced by performing control to improve the cohesion while the amount of the coagulant is small.

  As another control method for performing stable aggregation and precipitation even when the zinc concentration in the inflow flushing drainage is low, as shown in FIG. A fixed amount of coagulant may be introduced without increasing the amount of material (sludge) returned. Although FIGS. 4 and 6 show control examples of the amount of coagulant and the amount of returned sludge, the amount of coagulant is also the same as the amount of coagulant.

  Next, another example will be described. FIG. 7 shows an outline of a system of a treatment system for carrying out another method for treating flushing drainage, and this example is basically the same as the system shown in FIG. The downstream side is provided with a dilution system for treated water and a filter removal system. That is, in the system of FIG. 7, the dilution water pipe 62 is connected to the discharge pipe 61 connected to the pH adjustment tank 51 instead of discharging the treated water from the pH adjustment tank 51 as it is, A dilution water, for example, water can be supplied by a pump 63 from a dilution water supply source (not shown) to the dilution system piping 62. On the other hand, for the filter removal system, the filter removal system piping 64 is connected to the discharge pipe 61, the filter removal system piping 64 is provided with the filter 65, and the treated water from the discharge pipe 61 is supplied to the filter 65 by the pump 66 After removing the contaminants by the filter 65, it can be discharged out of the system.

  Such treatment of treated water by the dilution system and the filter removal system is performed by the controller Z. That is, based on the measurement result of the turbidimeter C provided in the discharge pipe 61, the valve 62a for discharging the system as it is, the valve 62a for processing by the dilution system, the pump 63, and the filter removal Control of the valve 64a and the pump 66 for performing processing by the system is performed.

  And in the system example of FIG. 7, the pH adjustment tank 11, the coagulation tank 21, the coagulation tank 31, the settling tank 41, and the pH adjustment tank 51 are bypassed, and flushing drainage is directly sent downstream of the pH adjustment tank 51. A bypass pipe 69 is provided. The open / close control of the valve 69 a of the bypass pipe 69 is also performed by the control device Z based on the measurement result of the turbidity meter A.

  According to the system having such a configuration, for example, if the measurement result by the turbidity meter C (zinc concentration based on turbidity) is less than a predetermined value, the pH adjustment tank is controlled by opening the valve 61a and closing the valves 62a and 64a. The treated water from 51 is discharged from the discharge pipe 61 out of the system as it is.

  And, when the measurement result by the turbidity meter C exceeds the predetermined value, when it does not greatly exceed the predetermined value, for example, the predetermined reference value (zinc concentration) is 2 mg / L and the measured value is 2.5 mg / L. In some cases, it may be more cost effective to dilute and discharge with dilution water than to carry out further processing. In this case, the treated water from the pH adjustment tank 51 is diluted by the dilution system piping 62 and discharged out of the system by the control of closing the valve 61a, opening the valve 62a, and closing 64a.

  Similarly, when the measurement result by the turbidity meter C exceeds the predetermined value, if it does not greatly exceed the predetermined value, the valve 61a is closed, the valve 62a is closed, and the 64a is opened. Treated water is discharged out of the system after contaminants are removed by the filter 65 of the filter removal system piping 64. As the predetermined value, for example, a filter filtration test may be performed in advance, and the correlation between the zinc concentration before filtration and the zinc concentration after filtration may be measured and determined from the measurement result. For example, when the reference value is 2 mg-Zn / L, if the zinc concentration before filtering is 5 mg / L and the zinc concentration after filtering is 2 mg / L, the predetermined value is 5 mg-Zn / L. In practice, it is set to a slightly lower value for safety, for example, about 4 mg-Zn / L.

  By filtering the treated water with the filter 65, fine particles can be removed and the concentration of zinc in the treated water can be lowered. However, since the fine particles are easily clogged in the filter, filtering the total amount of treated water increases the cost required for replacement and maintenance of the filter. Therefore, it is most economical to filter only when the zinc concentration of the treated water is high. Until now, it was not possible to continuously measure the concentration of zinc in treated water, but according to the present invention, it is possible to easily estimate the concentration of zinc in treated water by measuring turbidity, such economic A control method becomes possible.

  The particle size of the particulate matter in water obtained by treating the flushing drainage by coagulation is the largest in the range of about 1 to 10 μm. Therefore, as the filtering material of the filter 65, a known filtering material having a filtration diameter of about 0.1 to 10 μm is used I can do things. The use of a cartridge filter as the filter medium is the most inexpensive and convenient.

  Furthermore, when the zinc concentration of the flushing drainage measured by the turbidimeter A does not greatly exceed the predetermined reference value, after being treated with the dilution system and the filter removal system in the same manner as above, it may be discharged out of the system. it can. Of course, if the zinc concentration of the flushing drainage measured by the turbidity meter A is less than a predetermined reference value, it is discharged out of the system through the discharge pipe 61 as it is. The system may have one of a dilution system and a filter removal system.

  As described above, according to the present invention, since the zinc concentration in waste water and treated water can be estimated immediately and continuously based on the turbidity of flushing drainage and treated water, it is adopted in the above system. Thus, it is possible to carry out a suitable treatment depending on the concentration.

  Unlike flushing drainage, zinc-containing drainage discharged from plating plants, zinc smelting plants, etc. varies in composition depending on the manufacturing plant, and the drainage generated in various processes is mixed at the discharge port, so zinc While the correlation between concentration and turbidity differs from day to day, substances other than zinc often affect the turbidity, and often there is no correlation between the zinc concentration and the turbidity.

  Moreover, in Unexamined-Japanese-Patent No. 2002-28663 (henceforth "the reference technique"), it is disclosed that the suspended matter density | concentration of process water is measured and the amount of coagulants is controlled by it. However, as a result of the present inventor's analysis of the flushing drainage discharged from various places, it was found that the flushing drainage has no correlation with the amount of suspended matter and the concentration of zinc, and the same control can not be used. FIG. 8 shows the results, in which the suspended matter concentration and the zinc concentration are not directly related. Therefore, with the technology described in the reference technology, it is impossible to immediately and continuously know the zinc concentration in the flushing drainage based on the turbidity, as in the present invention, and concerning that matter Exceptionally useful information is not found in the reference technology. Also, there is usually no correlation between zinc concentration and turbidity. This is because both zinc dissolved in water and zinc not dissolved contribute to the concentration of zinc, but only zinc which does not dissolve affects turbidity, so it is unique to flushing drainage It is presumed to be a correlation.

  As described above, the correlation between the turbidity of the flushing drainage from the galvanized steel pipe and the zinc concentration was discovered for the first time by the inventors, and the present invention is based on the discovery. , Was newly built. In addition, since hot-dip galvanized steel pipes used for this type of equipment are defined in JIS, the products and the manufacturing method are almost the same regardless of the product to any maker, and they are constructed by the same construction method. There is. The inventors paid attention also to this point, and since the component ratio of the flushing drainage of the galvanized steel pipe is almost the same in almost all facilities, the above-mentioned drainage treatment method has been invented.

  According to the above disclosed technology, oil and heavy metals such as lead can be stably removed at the same time in addition to zinc in the flushing drainage. Also, after the flushing drainage is treated with this system, it can be returned to the piping system again (that is, the piping on the downstream side of the pH adjustment tank 51 in the system of FIG. 2 and the drainage pipe in the system of FIG. 61 to connect the piping system so that flushing drainage can be circulated between the piping system and the present system) connecting the piping system and the system of the present invention, for example, the number of water through the piping system and the system of the present invention After circulation and sufficient treatment, the system may be removed from the piping system, and the treated water returned into the piping system may be used as it is as water for air conditioning.

  According to the disclosure content described above, there is provided a method of treating flushing drainage from a piping system of a facility piping a galvanized steel pipe, comprising the steps of adjusting the pH of the flushing drainage, and adjusting the water after adjustment to inorganic condensation. And coagulating with a polymer flocculant to separate and remove the zinc-containing aggregates, and turbid of the flushing drainage (treated raw water) or the treated water after the separation and removal It is possible to propose a method of treating flushing drainage from a piping system characterized by measuring the degree and adjusting the input amount of the inorganic coagulant and the polymer coagulant based on the measurement result.

  In the step of separating and removing the aggregates, in addition to the precipitation and aggregation in the precipitation tank, filtration may be performed using a filter.

  In the case where the separation and removal described above are carried out by precipitating the aggregates in a settling tank, the method further comprises the step of returning the precipitated aggregates to the front side of the step of coagulating with the inorganic coagulant; The amount of agglomerates returned and / or the amount of flushing drainage to be treated may be adjusted based on

  When the measurement result becomes equal to or more than a predetermined value, the treated water may be reprocessed without being discharged to the outside of the system, diluted and then discharged, or filtered and filtered and then discharged.

  According to the disclosed technology described above, the amount of addition of the coagulant and the coagulant can be appropriately controlled when treating the flushing drainage from the piping system of the installation piping the galvanized steel pipe, and the turbidity degree in advance By examining the relationship with the zinc concentration, it is possible to easily estimate the concentration of zinc in waste water and treated water.

  The present invention is useful for the treatment of flushing drainage from piping systems.

DESCRIPTION OF SYMBOLS 1 inflow pipe 2 inflow pump 11, 51 pH adjustment tank 12, 22, 32, 52 pump 13, 23, 33 stirring apparatus 21 condensation tank 31 coagulation tank 41 sedimentation tank 43 return pipe 45, 61 discharge pipe 46 return pipe 47 return pump 62 Dilution system piping 64 Filter removal system piping 65 Filter 69 Bypass pipe A, B, C Turbidimeter Z controller

Claims (3)

A method of treating flushing drainage from the piping system at the time of flushing the water piping system for air conditioning in an air conditioning facility with water ,
Connecting a system having a filter for filtering the flushing drainage and the piping system;
The flushing drainage is circulated between the piping system and the system, and after the flushing drainage is treated by the system, it is returned to the piping system again,
Then remove the system from the piping system,
A method of treating flushing drainage from a piping system, characterized in that the treated water returned into the piping system is used as it is for air conditioning in the piping system. The method for treating flushing drainage from a piping system according to claim 1, wherein the system is removed from the piping system after circulating the flushing drainage through the piping system and the system several times. The piping system according to any one of claims 1 and 2, wherein the treated water is not discharged out of the system when the measurement result of the turbidity of the treated water becomes equal to or more than a predetermined value. How to handle flushing drainage from

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