JPS62100494A - Purification of human excretion waste water by solid-liquid separation and organic fertilizer production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention effectively separates solid-liquid wastewater from human excrement, which accounts for a large portion of the environment as a source of environmental pollution. In addition, by making the solid part usable as high-quality organic fertilizer, we can prevent environmental pollution caused by wastewater from human waste, and we can also solidify wastewater from human waste to recycle discarded human waste as high-quality organic fertilizer. This invention relates to purification through liquid separation and a method for producing organic fertilizer.

(Prior Art) Conventional human excrement wastewater treatment methods include the standard activated sludge method or a method that partially applies it. For example, there is an activated sludge method as shown in FIG. The process of treating human waste wastewater using the activated sludge method involves removing huge impurities from the human waste wastewater, and then
After placing it in an adjustment tank, the liquid properties are made uniform, the pH is adjusted, etc., and then the foot is continuously pumped into a hot air tank.
Organic substances in human waste wastewater are oxidized and decomposed by aerobic bacteria groups activated by the air sent from the blower, forming activated sludge, and purifying the wastewater. Wastewater containing activated sludge turned into large particles has a sedimentation content of 1 liter.
The activated sludge is transferred to the II tank and allowed to settle for a certain period of time, whereupon the activated sludge and supernatant liquid are separated. After the excess sludge is separated into liquid and solid by a dehydrator, the solid is landfilled or discarded, and the liquid is circulated again to carry out the purification process of human excrement wastewater. However, with this type of activated sludge method, when the pollution concentration of human waste wastewater is high, the conditions make it difficult for aerobic bacteria to work in the aeration tank, so the wastewater is not purified within 1 minute. Ta. Therefore, it is necessary to adjust the pollution concentration, so a large amount of dilution water (10~
20 times) had to be added. As the amount of wastewater increases due to the addition of large amounts of diluted water, facilities such as hot air tanks become larger, operation and management become more complicated, facility costs increase, and water supply and facility costs due to diluted water supply facilities increase. However, it had many drawbacks, such as an increase in the power cost of the blower due to the increase in the amount of aeration in the hot air tank.

(Problems to be Solved by the Present Invention) The present invention efficiently purifies human excrement wastewater without using water, regardless of the pollution concentration of human excrement wastewater, thereby reducing management costs and power costs. , it is possible to realize the centralization and simplification of various facilities, and also to perform the purification process simply and completely to obtain purified water that meets the water quality standards, and to use the solid matter obtained in the treatment process as a high-quality organic fertilizer. This makes it possible to reuse resources.

(L stage for solving the problem) The present invention removes huge impurities contained in pumped human excrement wastewater through a contaminant processor, a crusher, a drum screen, etc., and after removal, Human excrement wastewater is transferred to a reaction aeration tank, warmed by blowing air at a predetermined amount for a predetermined time without dilution, and a predetermined amount of inorganic flocculant is added and agitated to coagulate, followed by solid-liquid separation via a dehydrator. The solids are aerated and naturally fermented to produce organic fertilizer, while the dewatered filtrate and dehydrator filter cloth washing water are transferred to a sedimentation tank and allowed to settle for a predetermined period of time to produce clean effluent water or water for second-hand business use. This is a method for purifying human excrement wastewater by solid-liquid separation and producing organic fertilizer, which is characterized by:

Furthermore, when aeration is started before the reaction starts, a small amount of a humus reaction accelerator produced by natural bacteria of organic matter and Fe... may be added to the sow. Furthermore, after the completion of the reaction, the human excrement wastewater before aggregation may be returned in an amount of about 20 to 30% or 70 to 80% of the amount of human excrement wastewater before the reaction temperature.

Further, a reverse osmosis membrane can be used as the sedimentation tank for processing the dewatered filtrate and filter cloth washing water.

(Example) An example related to an uninvented invention will be described below with reference to the drawings.

As the first step, huge foreign matter contained in the human excrement wastewater in the input tank 1 is removed via a foreign matter treatment machine 2, a crusher 3, a drum screen 4, etc. (conventional activated sludge method ).

In the second step, the human excrement wastewater from which impurities have been removed is transferred to the reaction temperature tank 8, where the activity of bacterial groups promotes the oxidative decomposition and particleization of soluble substances in the wastewater, and promotes the growth, binding, flocculation and nitrification of sludge. Before starting the reaction, at the same time as starting the aeration, 1,000 humus reaction accelerators were generated by a group of natural bacteria of 41 substances.
By adding a small amount of ~3000 ppm of p e* +, anti-r43 is further promoted and more economical efficiency can be achieved. In the reaction aeration tank 8, human excrement wastewater 1k9. 1 to
While supplying air at 2 m''/h for 12 hours to 4 days, constant pH (e ~ 7.5) @Nitrogen (N) by surrounding and form
(7) Concentration (NH4-N tN03-N) ノN0
The completion of the reaction is determined when 3-N increases or the presence of different types of microorganisms. In addition, by returning 20-30% or 70-80% of the human excrement wastewater after the reaction,
The reaction time can be significantly shortened.

As the third step, the human excrement wastewater after the reaction in the reaction bomb tank 8 is transferred to the flocculation tank 10, where it is adjusted to a pH of about 9 to 10 with a pH adjuster (NaOH etc.) 12 as necessary. ), 1000p of inorganic flocculant (FeC13) 11
Add 2000 ppm to the mixture and stir in a slightly acidic environment for about 20 minutes to coagulate.

As the fourth step, a vacuum dehydrator 13 is used (other types of dehydrators can also be used) to dehydrate and separate the coagulated human excrement wastewater, and turn the solids (70 to 75% water content) into fertilizer in a fully ripened facility. Air blower fi, which is an aeration device, is used for about 10 to 15 days by the device 17.
When aerated with le, natural fermentation produces high-quality organic fertilizer from which pathogenic bacteria and parasite eggs are removed.

Furthermore, other steps include transferring the dewatered filtrate from the dehydrator 13 and the washing water 14 that has washed the filter of the vacuum dehydrator 13 to a sedimentation tank 16 to remove a small amount of solid sludge contained in the washing water 14; When the water is allowed to stay and settle for 4 hours, clean and purified effluent water is obtained, a portion of which is transferred to a water tank for reuse as filter cleaning water, and the remainder is discharged. Further, a small amount of sludge settled in the settling tank 16 is returned to the reaction aeration tank 8 again.

5.6 is a belt conveyor, 7 is an incinerator, 9 is a blower, 1
5 is water for use.

The human excrement wastewater treatment process based on the conventional activated sludge method is as shown in Fig. 2, and as explained below, after removing huge impurities from human excrement wastewater, it is put into the adjustment tank 20 and liquid-based. We will perform work such as equalization and PH adjustment tri. After the work,
While continuously pumping a certain amount of water into the hot air tank 21,
The organic substances in the human waste wastewater are oxidized and decomposed by the aerobic bacteria group that is diluted to 0 times and activated by the air sent from the blower 22, forming activated sludge, and the wastewater purification progresses. do. Then, the wastewater containing the activated sludge that has been made into giant particles is transferred to the sedimentation separation tank 23, where it is allowed to stay and settle for a predetermined period of time. This precipitation produces activated sludge and -1-
The clear liquid is separated, -1- The clear liquid is discharged, a part of the settled activated sludge is returned and circulated to the waterfall tank 21 by the sludge pump 25, and the remaining surplus sludge is separated into liquid and solid by the dehydrator 24. After several minutes, the solids are buried or discarded, and the liquids are circulated again to carry out the human waste wastewater purification process. The above is the treatment process using the conventional activated sludge method.

The present invention is processed through each of the steps as described above, and when further experimental operations were carried out, the following results were obtained.

(1) Experiment details ■Human excrement wastewater; The collected human excrement wastewater was
The water quality after removing impurities in the process is as follows.

BOD; f5,000ppm~20,0OO
pp+*COD; 8,000ppm~15,
0OOTIP11SS; 20,000ppn
+ ~30,000ppm liquid temperature, 15~30℃ pH -8~9 ■Reaction temperature Only at the start of operation, add 1000~3000ppm of a humic reaction accelerator and 1 layer of io~300PI of Fe'' to the above human waste wastewater. , for adding human excrement wastewater!J
, about 20 to 40 g/min of air is continuously supplied.

Reaction time: 12 hours to 411 hours Pll; 6 to 7.5 ■ Aggregation If necessary, add a pH adjuster (
After adding NaOH) 12, an inorganic flocculant (FeCl
3) After adding 1,000 to 2,000 ppm of 11, stir and aggregate for about 20 minutes.

■Dehydration, sedimentation 0.8-1. A vacuum dehydrator 13 on an OK scale is used to dehydrate the coagulated human excrement wastewater. a small amount of water mixed with the dehydrated filtrate and the filter washing water 14;
In order to remove the += solid sludge, it is transferred to a sedimentation tank 16 and allowed to stay and settle for 3 to 4 hours. - portion is discharged and a portion is transferred to a water tank for use as filter cleaning water 14. A small amount of solid sludge is returned to the reaction temperature tank 8.

Water quality of discharged water; BOD: ! Below Oppm COD:
20 pp- or less S S: 20 pp or less F T -N: 80 ppm or less T-P: 3 ppm or less pH: 6 to 8 ■ Solid matter separated from solid fertilizer fully ripened dehydrator 13 (moisture content 70 to 75%)
is naturally fermented by aeration for 10 to 15 days in a fully ripened compost production facility 7.

(2) Experimental results ■Provided purified water that met water quality standards.

C) 0 to 80 kg of solid organic fertilizer 19 can be produced when human excrement wastewater is not treated.

- Comparing the treatment method of the present invention based on the experimental operation as described in section 1 with the conventional treatment method, the following results (part 1,
It turns out that there is a 2).

(Part 1) (Part 2) (Effects) (1) The present invention promotes oxidative decomposition and particle formation of soluble substances in wastewater without dilution, and at the same time prevents the growth, binding, and formation of sludge in wastewater. After accelerating various reactions such as flocculation and nitrification, the remaining fine particles are enlarged using an inorganic flocculant so that solid-liquid separation can be easily performed, so that the resulting liquid part can be purified to meet water quality standards. This is an innovative method that allows waste water to be discharged and reused, and solid materials to be recycled as fully ripened, high-quality organic fertilizer.

(2) Furthermore, the present invention has a low concentration (BOD approximately eooppm or less), which has been considered as common knowledge in the conventional activated sludge method.
Unlike measuring the growth of aerobic microorganisms continuously under the
Since solid-liquid separation is possible through a chemical flocculation reaction by making full use of various reactions such as microbial activity, management is much simpler, and the usage of flocculants is also lower than that of conventional activated sludge. It has the advantage that sufficient separation can be achieved with a much smaller amount than the amount used for processing the surplus square mud produced by the method.

(3) In addition, in the present invention, before starting the reaction in human excrement wastewater from which impurities have been removed, at the same time as tU Qi is started, the humic reaction accelerator (1000
~3000ppm) and Fe''' (100~200ppm)
By adding a small amount of pm), the reaction temperature time can be shortened, better treated water and organic fertilizer can be obtained, and treatment costs can also be reduced.

(4) Furthermore, the present invention can obtain industrial water and produce high-quality fertilizer by purifying human excrement wastewater with relatively simple facilities and at a low price, thus preventing environmental pollution and reducing acidification. It has significant advantages that can significantly contribute to soil revitalization.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a treatment process according to the present invention, and FIG. 2 is a diagram showing a conventional human excrement wastewater treatment process. 1-... Input tank, 2... Foreign matter processing machine, 3... Crushing machine, 4... Ginseng drum screen, 5゜6・e@belt conveyor, 7@ψ Ginseng incinerator, 8... Reaction temperature tank, No. 9/
Blower, 10・Φsha flocculant tank, 11・Fist・Inorganic flocculant (F
eC13), 12--pH adjuster (NaQH etc.), 1
3--Vacuum dehydrator, 14-φ washing water, 15--conference water, 16--settlement tank, 17-φ-fertilizing device, 18φ
・Blower 19φφ・Solid organic fertilizer, 20・Adjustment tank, 21...Aeration tank, 22・Houseφ blower, 23...
Separation tank, 2411--Dehydrator, 25--Fist sludge pump.

Claims (4)

[Claims] (1) Huge contaminants contained in the pumped human excrement wastewater are removed via a contaminant treatment machine, crusher, drum screen, etc., and the human excrement wastewater after removal is transferred to a reaction waterfall tank. Then, without dilution, blow air at a predetermined amount for a predetermined time to aerate the mixture, add a predetermined amount of an inorganic flocculant, stir and flocculate, separate solid and liquid through a dehydrator, and aerate the solids to allow natural fermentation. By solid-liquid separation of human excrement wastewater, the dewatered filtrate and dehydrator filter cloth washing water are transferred to a sedimentation tank and allowed to settle for a predetermined period of time to obtain clean effluent water or industrial water. Purification and organic fertilizer production method. (2) Before starting the reaction At the same time as starting the fall, the humus reaction accelerator and Fe^+^ produced by natural bacteria in the organic matter
Claim 1 characterized in that a small amount of + is added.
Purification and organic fertilizer production method by solid-liquid separation of human excrement wastewater as described in Section 1. (3) After the reaction waterfall is completed, the human feces wastewater before aggregation is returned by about 20 to 30% or 70 to 80% of the amount of human feces wastewater before the reaction waterfall. A method for purifying human excrement wastewater by solid-liquid separation and producing organic fertilizer as described in Scope 1. (4) The method for purification and organic fertilizer production by solid-liquid separation of human excrement wastewater according to claim 1, characterized in that the sedimentation tank for treating the dehydrated filtrate and filter cloth washing water is a reverse osmosis membrane.