JPS6141637B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a wastewater purification vehicle. In recent years, the purification of wastewater containing pollutants has become important in Japan, but the construction of purification facilities has not been able to keep up with the increase in wastewater due to population growth, and it is particularly difficult to secure sites for purification facilities. This has become difficult due to opposition from local residents, and there has been a problem in that it has not been possible to reliably purify the wastewater. By the way, for disaster relief, a transportable device equipped with purification means to make contaminated water drinkable has been proposed (Japanese Unexamined Patent Application Publication No. 1973-1981).
(See Publication No. 110143). However, this conventional device has a complicated structure, and is equipped with a means for measuring drinking water, a means for sealing a package containing drinking water, etc., as well as a means for purifying water. The problem is that it cannot be done easily and inexpensively. In addition, with conventional equipment, contaminated water is purified using chlorine gas, which is extremely difficult to handle and highly dangerous to the human body, which poses a safety problem.Moreover, the remaining chlorine gas is released into the atmosphere. Since these substances are emitted, there have been problems such as corrosion of the vehicle itself carrying the equipment, corrosion of buildings around the parking area, and further pollution. This invention has been made to solve the above problems, and its configuration will be explained below based on embodiments shown in the drawings. In the drawing, 1 is a vehicle body consisting of a car;
2 is a primary oxidation reactor mounted on the front end of this reactor, which contains a waste water inlet pipe 3, an acid such as sulfuric acid, an oxidation reaction catalyst such as ferrous sulfate, and an oxidizing agent such as hydrogen peroxide. They are connected to supply pipes 4 and equipped with a stirrer 5, respectively. 6
is a solid-liquid separator placed following the primary oxidation reactor 2, which has a roughly rhombic longitudinal section, and has an inverted funnel-shaped slope in its tapered upper half that regulates the flow path. A plate 7 is provided. 8 is a primary purification flow pipe, the starting end of which is placed in the bottom of the primary oxidation reactor 2, the other end is connected to the top of the solid-liquid separator 6, and a pump is installed in the middle. 13
is mediated. 9 is a sediment discharge pipe connected to the lower end of the tapered bottom of the solid-liquid separator 6, 10 is an on-off valve equipped thereon, and 11 is a sediment discharge pipe arranged below the solid-liquid separator 6. A dehydrator 9 communicates with the dehydrator, and 12 is a secondary oxidation reactor disposed following the solid-liquid separator 6, which is equipped with five consecutive oxidation reactors 12a to 12e.
14 is the upper end of the solid-liquid separator 6 and the secondary oxidation reactor 12
15 is a flow meter interposed at the end of the separation liquid flow pipe connected to the lower end of the first reaction column 12a, and 16 is a flowmeter for each reaction column 12a.
17 is an oxygen supply lamp whose starting end is connected to a liquid oxygen cylinder 18 and whose branched terminal end is connected to a diffuser nozzle 19 in each of the reaction tubes 12a to 12e. A pipe, 20 is an intermediate flow pipe that interconnects the top and bottom ends of adjacent reaction cylinders, and 21 is each reaction cylinder 12a to 12e.
An exhaust gas flow pipe containing oxygen and ozone is connected to the top of the secondary oxidation reactor. Unreacted oxygen and ozone in reactor 12 are led to primary oxidation reactor 2 and used there for aeration. 2
3 is connected to the secondary oxidation reactor 12 and the vehicle body 1
A neutralization tank is placed at the rear end, and is equipped with an agitator 24, and the tip of a secondary purified water discharge pipe 25 is visible. 26 is a clean water discharge pipe connected to the neutralization tank 23, and a valve 27 is interposed in the middle thereof. The wastewater purification vehicle is moved to a predetermined location where a wastewater storage tank (not shown) is installed. There, wastewater containing pollutants is collected as a vacuum.
It is sucked up into the primary oxidation reactor 2 through the introduction pipe 3 by a pump or the like. In the primary oxidation reactor 2, sulfuric acid is added to the wastewater to make it acidic, an appropriate amount of hydrogen peroxide is added, and an amount of ferrous sulfate is added as a catalyst. In wastewater containing pollutants, hydrogen sulfide, ammonia, methane, etc. are generated due to the action of anaerobic organisms, and the wastewater is in a reduced state. As a result, hydrogen sulfide, ammonia, methane, etc. are oxidized and decomposed, and the wastewater to be treated becomes oxidized.At the same time, organic matter is oxidized and decomposed by the action of aerobic bacteria. Harmful sulfide formation is inhibited and harmless sulfates and nitrates are produced. In addition, colloidal particles in the wastewater are decomposed, thereby improving solid-liquid separation in the wastewater. Next, by operating the pump 13, the primary purified water from the primary oxidation reactor 2 is introduced into the top of the solid-liquid separator 6 via the flow pipe 8. The primary purified water gradually descends inside the separator 6 along the outer surface of the inclined plate 7, and the solids are precipitated at the bottom, and the separated liquid passes through the inside of the inverted funnel-shaped inclined plate 7 and reaches the top of the separator 6. It is made to flow out from the flow pipe 14. The solids deposited at the bottom of the separator 6 are discharged from the discharge pipe 9 in a water-containing state of about 95%, dehydrated to a water content of about 50 to 60% in a dehydrator 11, and then incinerated, or Used as an organic soil conditioner. Next, the separated liquid discharged from the solid-liquid separator 6 is in a primarily purified state, and it is colored, has a residual odor, and also contains undecomposed organic substances. . This separated liquid is introduced into the secondary oxidation reactor 12 through the flow pipe 14,
The reactor 12 is made to pass through five reaction cylinders 12a to 12e in order. Each reaction cylinder 12a-12
In e, the separated liquid is irradiated with ultraviolet rays, and at the same time, oxygen is supplied from the oxygen supply pipe 17. A portion of the oxygen is then converted into ozone by the irradiation with ultraviolet rays, and the strong oxidizing power of this ozone and the irradiation energy of the ultraviolet rays cause the undecomposed organic substances in the separated liquid to be oxidized and decomposed extremely quickly. In this way, five reaction cylinders 12a to 1
The purified water that has been almost completely purified by successively passing through 2e is introduced into the neutralization tank 23 through the drain pipe 25. Note that the exhaust gas containing oxygen and ozone from each of the reaction tubes 12a to 12e is sent to the primary oxidation reactor 2 through the flow pipe 21 and introduced into the wastewater through the aeration nozzle 22. It is designed to assist in oxidation reactions. In the neutralization tank 23, an alkali such as caustic soda is added from the supply pipe 28 to neutralize the secondary purified water. The purified water treated in this way is completely deodorized and sufficiently bleached to be colorless.
The COD and BOD values are also within the standard values, and are either discharged as is from the discharge pipe 26 or reused. Further, this secondary purified water is almost sterile, so there is almost no need for chlorine sterilization, but even if chlorine sterilization is performed, the amount of chlorine used can be very small. In addition, the agitator 5 in the wastewater purification vehicle mentioned above,
24, the dehydrator 11, the pump 18, the ultraviolet light 16, etc. are operated by electric power from a power source 29 installed in the engine portion of the vehicle body 1. Next, an experimental example in which wastewater was purified using the wastewater purification vehicle of the above embodiment will be explained. Note that three different processing conditions were used. That is, first, sulfuric acid was added to the wastewater of the primary oxidation reactor 2 to make it acidic, and then hydrogen peroxide and ferrous sulfate were added. The amounts added to these wastewaters are shown in the table below.

[Table] Next, the primary purified water from the primary oxidation reactor 2 was introduced into the solid-liquid separator 6 to separate the solid content. A portion of the separated liquid discharged from the top of the solid-liquid separator 6 was extracted, and its PH value, chemical oxygen consumption (COD), amount of suspended solids (SS), and chromaticity were measured. The measurement results are shown in the table below. Next, the separated liquid was introduced into the secondary oxidation reactor 12, where the separated liquid was purified by irradiating ultraviolet rays while blowing oxygen into each of the five oxidation reactors 12a to 12e. The above characteristics of the secondary purified water discharged from the secondary reactor 12 were measured. The measurement results are summarized in the table below. In addition, the average time of ultraviolet irradiation in the secondary oxidation reactor 12 is 60 minutes in the first example,
In the second example, this was 30 minutes, and in the third example, this was 15 minutes.

[Table] Finally, the secondary purified water was introduced into the neutralization tank 23, neutralized with caustic soda, and discharged from the discharge pipe 26. In the above embodiment, sulfuric acid is used as the acid added in the primary oxidation reactor 2, but other acids such as hydrochloric acid may be used. Further, although ferrous sulfate is used as the oxidation reaction catalyst, it may be an oxidation reaction catalyst containing other metal ions. Further, although oxygen is blown into the secondary oxidation reactor 12 as an oxidizing gas, air or other oxygen-containing gas, or ozone or an ozone-containing gas may be used instead. From the point of view of oxidation reactivity, it is most preferable to use ozone, but some of the oxygen is converted to ozone by ultraviolet irradiation, so
Sufficient oxidizing power can also be obtained using oxygen-containing gases such as oxygen and air. Of these oxidizing gases, it is of course preferable to use air from an economic standpoint. As described above, the wastewater treatment vehicle according to the present invention includes the primary oxidation reactor 2 in the vehicle body 1.
, solid-liquid separator 6, and dehydrator 11 below this
, an oxidizing gas supply means 18 located between the primary oxidation reactor 2 and the solid-liquid separator 6, and a secondary oxidation reactor 12 consisting of multiple stages of acid reaction cylinders 12a to 12e.
Since the neutralization tanks 23 are arranged in this order,
It is very compact, and therefore the wastewater treatment vehicle can be manufactured easily and inexpensively, and the vehicle can be downsized and requires less parking space. The wastewater is then purified in the primary oxidation reactor 2 using an acid such as sulfuric acid, an oxidation reaction catalyst, hydrogen peroxide, and an auxiliary oxidation gas containing oxygen or ozone, and then the solids in the primary purified water are solidified. The undecomposed pollutants in the primary purified water, which are separated and removed by the liquid separator 6 and do not contain solid matter, are removed from the secondary oxidation reactor 1, which is composed of multiple stages of oxidation reactors 12a to 12e.
2, the wastewater is oxidized and decomposed sequentially and continuously by oxidizing gas and ultraviolet irradiation, and finally the secondary purified water is neutralized in the neutralization tank 23, so that the wastewater can be purified very quickly and almost completely. can be purified to obtain colorless, odorless and sterile reusable purified water. Furthermore, since chlorination treatment as in the conventional method is not performed, it is extremely safe and has the effect that it does not cause pollution due to the release of chlorine gas.

[Brief explanation of the drawing]

The top view is a schematic side view showing an embodiment of the invention. 1...Vehicle body, 2...Primary oxidation reactor, 3...
...Wastewater introduction pipe, 4...Acid such as sulfuric acid, oxidation catalyst and hydrogen peroxide supply pipe, 6...Solid-liquid separator, 11
...Dehydrator, 12...Secondary oxidation reactor, 12a~
12e... Oxidation reaction cylinder, 16... Ultraviolet irradiation lamp,
17...Oxygen supply pipe, 23...Neutralization tank.

Claims (1)

[Claims] 1 The front end of the vehicle body 1 is equipped with a primary oxidation reactor 2 that oxidizes and decomposes pollutants in wastewater using an acid such as sulfuric acid, an oxidation reaction catalyst, and hydrogen peroxide. Next, a solid-liquid separator 6 is installed to separate and remove solids contained in the primary purified water from the reactor 2. A dehydrator 11 is installed below the solid-liquid separator 6, and the primary oxidation reactor 2 An oxidizing gas supply means 18 is installed between the solid-liquid separator 6 and the oxidizing gas supply pipe 17 and an ultraviolet irradiation lamp 16 at the rear of the vehicle body 1, and is used to remove undecomposed contaminants in the primary purified water. The vehicle is equipped with a secondary oxidation reactor 12 consisting of multiple stages of oxidation reaction cylinders 12a to 12e that continuously oxidize and decompose substances, and is equipped with a neutralization tank 23 at the rear end of the vehicle body 1. Wastewater purification vehicle.