JPS6034887B2 - Wastewater treatment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wastewater treatment method for purifying industrial wastewater, sewage, human waste, and the like.

In conventional wastewater treatment, as shown in FIG. 1, sand, dust, etc. are first removed by a sand and dust removal device 1, and then the wastewater is sent to a preliminary aeration layer 2.

Here, air is blown into the rope to make it easier to sink, and to float, and the next step is to move to the first sedimentation tank 3.
The garbage that floats on the surface of the pond is scraped up and removed by a machine, and the sludge that has settled is scraped up at the bottom of the pond and pumped out. The wastewater that has passed through the sedimentation tank 3 is sent to the aeration tank 4, where it is mixed with muddy water containing microorganisms and air.The microorganisms feed on organic matter in the sewage, take dissolved oxygen in the water, multiply, and settle. and is precipitated in the final settling tank 5. The wastewater discharged from the final settling tank 5 is sterilized from bacteria such as E. coli in a sterilizer 6, and is then reused as purified water or discharged into the river. On the other hand, the sludge settled in the first settling tank and the activated sludge settled in the final settling tank go through a sludge treatment device 7, such as a thickening tank, a flocculating tank, a flocculating tank dryer, etc., and are then landfilled or incinerated.

A part of the activated sludge is returned to the main aeration tank 4 via the pipe 8, and only the surplus is sent to the sludge treatment device 7. Now, in the treatment process described above, among the pollutants represented by BoD and COD, in particular, in the sedimentation process, water-soluble substances are separated from the wastewater as insoluble forms, that is, solids.
Coagulation and sedimentation ponds are generally used to apply biochemical treatment and separate floc-like solids generated by the action of bacteria from wastewater.

However, since the volume of this sedimentation tank occupies a considerable portion of the wastewater treatment process, it has the disadvantage that it requires a huge amount of land as a treatment facility. The present invention eliminates the aeration tank and the final sedimentation tank in the wastewater treatment process as shown in Figure 1, that is, the biochemical treatment process, and incorporates a moving bed type furnace after the initial sedimentation tank. By means of drainage,
This is an attempt to reduce the size of processing facilities.

Fig. 2 shows the wastewater treatment method according to the present invention, which enters the pre-aeration tank 2 through the dust removal device 1, and the wastewater that is precipitated in this step is easily precipitated, and the wastewater that floats is made easy to float. 3
The process up to the feeding is completely the same as the conventional example shown in FIG.

The overflow of the settling tank 3 is sent to a moving bed type furnace filtration device 9.

The wastewater filtered by the filtering device 9 is sterilized of coliform bacteria and the like by the sterilizer 6, and then is reused as purified water or discharged into a river. The furnace filtration device 9 uses combustible furnace material such as pulverized coal, and the furnace material is moved by a rotary feeder 10 etc. installed at the bottom of the furnace tank, so that the part through which wastewater passes is always allowed to filtrate. A so-called moving bed furnace, which can be operated continuously, is used.

As shown in the figure, this filtration device 9 has partition plates installed at the upper and lower parts of the filtration tank to divide the filtration layer into two into the raw water side and the treated water side. A rotary feeder 10 for discharging furnace material is installed at the bottom of the layer and the treated water side furnace layer, respectively.
It is equipped with Therefore, the rotary feeder on the raw water side
By driving 10 at high speed according to the degree of pollution,
The reactor layer on the raw water side can be moved quickly.

The treatment capacity of this treatment method is limited by the properties of the pollutants contained in the wastewater, but in some cases, installing multiple stages of moving bed furnaces can provide water quality that satisfies the discharge standards. . The volume of the filtration device 9 is smaller than that of the aeration tank and the coagulation and sedimentation tank.

Therefore, compared to conventional equipment, the area required for the entire water treatment system can be reduced, the investment amount for wastewater treatment equipment can be significantly reduced, and running costs can also be significantly reduced. The moving bed furnace uses combustible materials such as activated carbon, sea plastic, and coal seams as its furnace material.

Therefore, it is useful for the effective use of solid waste, and the suspended solids in the wastewater that are adsorbed and collected by the furnace material are dried together with the furnace material and finally used effectively as fuel. Since the raw water side reactor layer can be moved quickly, the raw water side reactor material and the treated water side reactor material can be used effectively.

In addition, the particle size of the furnace material should be selected from 0.1 to 1 Dian, depending on the type of furnace material, waste water quality, discharge standards, etc., but moving bed furnaces Since a filtration device is used, the filtration layer can be adjusted to obtain excellent filtration performance by combining furnace layers with different particle sizes or different types of furnace materials on the raw water side and the treated water side. Furthermore, since the moving bed type furnace filtration device is used, there is no need for a step of cleaning the hem material, the processing capacity is greater than that of the fixed bed type furnace filtration device, and continuous and stable furnace filtration performance can be obtained. In addition, since the coagulation sedimentation tank was omitted and a moving bed type furnace was used in its place, the sludge treatment equipment could be simplified and downsized by only treating the sludge in the sedimentation tank at first.

[Brief explanation of the drawing]

FIG. 1 shows a conventionally known wastewater treatment device. FIG. 2 shows an example of an apparatus for carrying out the wastewater treatment method according to the present invention. In the figure, 1...Sand settling and dust removal equipment, 2...Preliminary aeration layer, 3...First settling tank, 4...Aeration tank, 6... ... Sterilization device, 7 ... Sludge treatment device, 8 ... Piping, 9 ... Moving bed furnace filtration device, 10 ...
・Rotary feeder. Figure 1 Figure 2

Claims (1)

[Claims] 1 After physically treating the wastewater using a sand and dust removal device, preliminary aeration tank, and initial settling tank, the layered filter bed made of combustible filter media is divided into two parts: the raw water side and the treated water side. A method for treating wastewater, characterized in that the wastewater is filtered by a mobile filtration device having a rotary feeder.