JPS60190290A - Treatment of organic waste water - Google Patents

Abstract

PURPOSE:To remove nitrogen and chromaticity at a stroke, by applying manganese dioxide treatment to waste water containing an org. substance and having pH adjusted to 5 or more to reduce COD, phosphorus, nitrogen and chromaticity. CONSTITUTION:In treating waste water containing an org. substance and high in content of COD, phosphorus and ammonia such as urban sewage, excretion waste water or factory waste water, alkali is added to waste water to adjust the pH thereof to 5 or more because there is possibility such that Mn<2+> is eluted when waste water is acidic. Next, this waste water is passed through a packed cylinder packed with a manganese dioxide filter material to perform adsorption and oxidative decomposition of the org. substance, phosphorus and nitrogen. With respect to waste water high in COD concn., a packed cylinder packed with the manganese dioxide filter material is used in a multi-stage fashion to make it possible to obtain treated water low in COD concn.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating organic water, and more specifically, it involves adsorption and oxidative decomposition of organic substances contained in urban sewage, urine wastewater, industrial wastewater, etc. using manganese dioxide. -0 to do
This relates to a method for treating mechanical wastewater.

In recent years, the quality of water flowing into open water bodies such as lakes and marshes has been strengthened with respect to nitrogen, phosphorus, etc., from the perspective of ``rUS nutrition,'' and chemical oxygen demand caused by organic substances has been strengthened.
(COD) is also required to be processed at a high level.

Conventionally, biological treatment, namely the activated sludge method, has been widely used to treat extracted water containing organic substances due to its low processing cost. Currently, it is difficult to treat COD caused by biorefractory substances, and it has almost no effect on COD caused by biorefractory substances.

For this reason, wastewater containing high concentrations of organic substances requires further advanced treatment, and requires the combined use of activated carbon adsorption and oxidation treatment using chlorine or ozone.

However, in the activated carbon adsorption method, since the biologically persistent substances are generally polymeric compounds, the pores in the activated carbon (several tens of
Activated carbon has the drawbacks of poor adsorption and diffusion, and short lifespan of activated carbon.

Chlorine or ozone oxidation methods are not widely used except in special cases because of high equipment costs and processing costs.

- fj, the common method for treating phosphorus-containing wastewater is the coagulation sedimentation method, but this method has the problem that sludge treatment is difficult because the sludge that forms during treatment has poor thickening and dewatering properties. There is.

Furthermore, as methods for treating ammonia nitrogen in wastewater, ammonia stripping method, biological treatment method a3, and adsorption method using zeolite are conventionally known.

In any of these treatment methods, COO.

It was almost impossible to reduce phosphorus, nitrogen and color at the same time.

The present invention was made based on such requirements, and an object of the present invention is to provide a method for treating organic wastewater that removes COO, phosphorus, nitrogen, and chromaticity in wastewater all at once.

In accordance with this purpose, as a result of various studies, water valve 111j people have found that by adding manganese dioxide to wastewater,
The present invention was based on the discovery that COD, phosphorus, nitrogen, and chromaticity in wastewater can be adsorbed, oxidized and decomposed, and removed all at once.

In other words, the present invention uses manganese dioxide to reduce CO2 in the treatment of wastewater containing organic substances.
D. A method for treating organic wastewater characterized by reducing phosphorus, nitrogen and chromaticity.

In this way, in the present invention, by oxidizing and decomposing non-biodegradable substances, etc. in organic wastewater using manganese dioxide, COD and chromaticity in wastewater can be effectively removed, and at the same time, COD in wastewater can be effectively removed. This treatment method has the effect of adsorbing phosphorus and ammonia nitrogen.

The processing method of the present invention will be explained below.

JJI water, which is the counterpart of JJC treatment in the present invention, is CO water containing organic substances such as urban sewage, raw wastewater, and pumped wastewater.
There is drainage water that is high in D, phosphorus, and oxidant content.

In order to treat these wastewaters, 1) If the wastewater is acidic with 11 being 4 or less, a trace amount of Mll may be eluted, so alkali is added to increase the pl-1 to 5 or more. It is necessary to employ a neutralization step beforehand.

Next, the wastewater neutralized to pi-15 or higher is passed through a cylinder filled with manganese dioxide material to adsorb and oxidize organic substances, phosphorus, and nitrogen, and to avoid oxidative decomposition.

For JJ) water with a high CoDil content, treated water with a low CoDil content can be obtained by using multiple stages of water filled with manganese dioxide'dM Ul, but it is possible to obtain treated water with a low CoDil content. By reducing the COD concentration to 100 ppm or less in advance, the life of manganese dioxide ill +A can be extended. Regarding chromaticity, for example, bile pigments contained in urine cannot be removed sufficiently by the activated sludge method, but with the treatment method of the present invention, the color can be almost transparent by simply passing through the manganese dioxide 1Iil material. water is available.

The manganese dioxide used in the present invention needs to be granular in order to provide an appropriate water flow rate. Various methods can be used to iq granular manganese dioxide, but for example, one that is granulated by applying the phenomenon in which particles solidify and cover each other when manganese dioxide crystals transfer and cover can be used. As a result of surface observation of such granular manganese dioxide, it was found that it is macroscopically porous and needle-like crystals of less than 1 μm exist on the surface due to illumination. It seems to be very effective against adsorption.

The treatment method of the present invention consists of the above-mentioned steps, and is a treatment method that is extremely simple and highly efficient compared to treatment methods that have been proposed and implemented in the past.

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples.

Example 1 100 cc of granular manganese dioxide of 0.4 to 0.6# was filled into a glass cylinder, and a COD depth of 81 was poured from the top of the cylinder.
The pHllll ulnar digestion and desorption fluid was prepared with an SV ratio of 1 to 51/
Water was passed through at a rate of 1-1r.

Figure 1 shows the COD concentration after water flow.

As shown in Figure 1, the CoDil degree of the treated water is approximately 25.
~35 ppm, and the COD removal rate was approximately 65%. Furthermore, within the range of SV ratios tested, no large COD concentration was observed in the treated water compared to ZG4.

In terms of chromaticity, the bed body digestion and desorption fluid has a deep yellowish color of J3 and C.
However, the color of the treated water was a dull yellow, almost transparent.

In addition, 1liIU of phosphorus J3 and nitrogen in 1 quintillion water are t'L 15 ppm and 1351111m telr, respectively.
dda (1) 1. : On the other hand, the ilJ degree of treated water passed through with an SV ratio of 1 is 0.2 ppm and 7.3111, respectively.
It was reduced to 110.

Tue-"L-Am" and pressurized body extinguishing 11 (2 parts 1 liquid diluted to 4 to 8 with tap water and C
ODm degree 20 pp+n, phosphorus concentration 4. Q ppm and an ammonia nitrogen concentration of 34 ppm were used as sample solutions, and water was passed through the sample solution at a speed of SV ratio 1 in the same manner as in Example 1.

The COD'a degree of the treated water is 7.0 ppm, and the phosphorus concentration is 0.
0 ppm and ammonia nitrogen concentration is 4. , Oppm
The chromaticity decreased to 711 and the color became transparent.

As explained above, the treatment method I) of the present invention using manganese dioxide is very effective in removing COD, phosphorus, nitrogen and chromaticity from wastewater containing organic substances, and CoDI
For wastewater with a degree of about 1100 pp, it is sufficient to use two to three manganese dioxide packed towers according to the present invention.

In this way, the treatment method according to the present invention can remove several types of substances at intervals, and the process itself is very simple, so equipment costs are low. It is suitably used as a treatment method.

[Brief explanation of drawings]

FIG. 1 is a graph showing the relationship between water flow rate (SV ratio) and COD concentration of treated water. Special a'F exit W1 person Mitsui Kinzoku Mining Co., Ltd. agent Patent attorney Tatsuo Ito agent Patent attorney Tetsuo Izuka's disease 1 E'', Imaginary 1 2 3 4 5 Water flow rate sv ratio u/Hrt

Claims (1)

[Claims] A method for treating organic wastewater, characterized by reducing J3 and chromaticity. 2. The method for treating organic 11 wastewater according to claim 1, wherein the wastewater before the manganese dioxide treatment is neutralized to Il+-15 or higher. 3. The method for treating organic wastewater according to claim 1 or 2, wherein the manganese dioxide is granular and macroscopically porous. 4. Or in which the manganese dioxide is filled in the filling cylinder
A method for treating IMtI JJI water as set forth in Claims 1, 2, or 3. 5. The method for treating organic wastewater according to claim 4, wherein the filling cylinder has multiple stages.