JPS59150598A - Treatment of night soil without dilution - Google Patents

Abstract

PURPOSE:To purify undiluted crude night soil with water, by performing an activated sludge process using sludge, in which bacteria are grown up in a state matured to the atmosphere of high concentration by sequentially changing a digested liquid after being aerobically digested into a higher load, as seed sludge. CONSTITUTION:After impurities are eliminated from night soil using a drum screen and a screw press, said night soil is charged in an aerobic digestion tank to perform aerobic digestion at 20-35 deg.C by the injection of air. By intensive aeration, both of COD and BOD in the digested liquid are reduced to about 3,000mg/l in about 4-7 days. An activated sludge process is performed at a temp. of 20-35 deg.C inside an aeration tank, while transferring the aerobically digested liquid as such to the aeration tank. The liquid after being treated with activated sludge is transferred to a precipitation tank A and left standing therein to perform solid-liquid separation. A part of a precipitate is returned as returned sludge to the aeration tank, while the other part is transferred as excess sludge to a reservoir tank. A supernatant liquid is subjected to coagulatively precipitating treatment. Said supernatant liquid is separated in a precipitation tank B.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for completely undiluting human waste,
The purpose of the present invention is to disclose a novel method for purifying collected human waste to a water quality within the legally regulated value without diluting it with water.

. Excluding special treatment methods for primary treatment, conventional human waste treatment methods employ digestion treatment, oxidation treatment, and chemical treatment, and then all of these treatment solutions are diluted 20 times and activated for secondary treatment. Treatment is carried out using a biological oxidation process mainly using the sludge method.

In order to fully implement the activated sludge method, etc., the operation of completely diluting the primary treatment liquid is completely established.

Recently, several methods have been proposed for treating human waste at substantially high concentrations, but it cannot be said to be completely diluted; in reality, it is diluted 2 to 5 times. Generally, in high concentration conditions, the activity of crude bacteria in the aeration tank decreases, making it difficult to perform biological oxidation treatment without dilution. However, on the other hand, the increase in the amount of human waste to be treated has led to the need for more equipment and the need to regulate the amount of wastewater. There was a desire to establish a system for treating human waste.

In view of the above-mentioned current situation, the inventor conducted a laboratory reexamination of the basic data and conducted a treatment test using a pilot plant, and as a result, the inventor found that complete non-dilution treatment is possible, and has hereby completed the process. It is.

The undiluted human waste treatment method according to the present invention is characterized in that the biological treatment includes aerobic digestion treatment and an activated sludge method,
The coagulation-precipitation method was used for all chemical treatments, and the activated carbon adsorption method was used for the final decolorization. Although some biological treatment methods are known, they have never been used to treat undiluted human urine, and up until now all methods have been 20-fold dilution.

The combination of aerobic digestion and activated sludge treatment is included in some cases, but the treatment conditions described below are unprecedented.
The activated sludge treatment should be carried out at ~35°C, and the activated sludge should be transferred to an aeration tank at an early stage and all activated sludge treatment should be carried out in a highly concentrated state.

At this time, the seed sludge is characterized in that the organic matter load of the digestive fluid is gradually increased, and all bacteria grown in the sludge that have been acclimatized to a high-concentration environment are used.

Hereinafter, the undiluted human waste treatment method of the present invention will be explained in detail according to the entire flow sheet 4d.

FIG. 1 is a flow sheet showing an embodiment of the present invention. The collected human waste is completely removed using a drum screen and screw press, and then transferred to a storage tank. Next, it is placed in an aerobic digestion tank, where air is blown into the tank and the aerobic digestion is carried out under the atmosphere.

Aerobic digestion requires that the temperature be maintained at a total temperature of 20 to 35°C, preferably around 30°C. If you are forced to expose yourself, it will be about 4~
? Elli &IC' Digestive Juice 0OI), BOD B
Both K will be about 3000 mf/l. DO increases from O to about 3-4 mDa/l. And even if you continue using it for more than 7 days, you won't see any change in your face. therefore,
There is no need to spend 20 to 30 days on conventional digestion methods. The generated gas is washed with water, adsorbed with activated carbon and deodorized, and then released.

Activated sludge treatment is performed by transferring the aerobic digestion treatment directly to an aeration tank. And the temperature of the air tank is 20~35℃,
Preferably, when the temperature is around 30°C, active movement of activated sludge organisms can be observed, and the pH has also decreased from 9.2 to 6.0 after inputting the digestive fluid.
It desquamates and biodegradation progresses rapidly. Generally, the conventional long-time exposure method has a BOD of $0.3 kg
/m', day or less, BOD, MLSS load 0, 2 Kq
/Kq・day It is said that it is best to drive under the following conditions. In this ring treatment method, BOD volume load is 0.86
K<1~・Ratio BOD-MLS8 load o, 19 to 9/+
Biodegradation progresses in a short period of time due to the extremely unique high load of +/day. However, COD ranges from 1100mf/l to 700-800mf/I! Therefore, biological treatment cannot be expected to have a high COD removal rate. However, due to the following coagulation-sedimentation treatment, C
The OD removal rate is promising.

That is, after activated sludge treatment, it is transferred to the settling tank (A),
Here, the sludge is allowed to stand still to separate the solid and liquid, and part of the precipitate is returned to the aeration tank as return sludge, and the other part is transferred to the storage tank as surplus sludge. The supernatant liquid is subjected to coagulation sedimentation treatment and sent to sedimentation tank (B).
The supernatant liquid is separated and the precipitate is transferred to a storage tank.

The mixed sediment in the storage tank is dehydrated using a dehydrator.

The desorbed liquid is returned to the coagulation and sedimentation tank for circulation treatment. The cake can be composted and used as fertilizer.

The supernatant liquid in the sedimentation tank (B) is decolorized by sand layer filtration and activated carbon adsorption, and then sterilized in a sterilization tank. Treated water quality: Transparency is 30 degrees or higher, chromaticity is 50 degrees or lower, and BOD is 30 mf.
/l! All ♂πm values were below the legal regulation value, and very good results were obtained.゛Hereinafter, this processing method will be explained in more detail by presenting all the numerical values in Examples.

Example (Pilot Plant No. 1) Characteristics of Sample The night soil used as a sample was obtained by removing impurities by a conventional method, and the analysis results are as shown in Table 1.

Table 1 The properties of the samples were measured using a UO-1l model manufactured by Central Kagaku Co., Ltd., and the chromaticity was measured by spectrophotometry (wavelength: 4108 m).

2. Aerobic Digestion Process The above human waste is placed in an aerobic digestion tank (effective capacity 7 doors, FRP door) using a vacuum truck, and forced aeration is performed while maintaining the digestion temperature at around 30℃. 7 Elfi [
[(lJlf]C0DSBOD are both 3000mf/1
It will be about. The color is dark brown, there is no human odor, but the ammonia odor is strong, and the PR is slightly alkaline, around 9.

The daily changes in water quality during the aerobic digestion process are shown in Table 2. DO increases from about 3 days after warming, and is approximately 3 to 4 mf/1 in one week! and reaches the equilibrium value. COD steadily decreases until the 6th day of digestion.

The pH changed from the 155th day and fell to 6.1-6.3. This is considered to be because NH4-N was oxidized to N02-N, since the detection of No2-N gradually increased as the biological treatment progressed.

3) Method for propagating seed sludge In order to make seed sludge that completely biodegrades the highly concentrated digestive fluid produced in an aerobic digestion tank, we first diluted the highly concentrated digestive fluid twice with water to prepare a stock solution of 151 polyno 10# Insert ffi,
The water temperature is around 25°C, and the water temperature is around 25°C.
Acclimatization was carried out by repeating the entire procedure of draining ml and adding the same amount of new high-concentration digestive fluid. After getting used to it for about a month,
Since degrading bacteria that can withstand high concentration digestive juices were developed, this sludge was used as a full-species sludge.

4) Seed sludge by seeding 3 was used as activated sludge in a total aeration tank. However, if the entire seed sludge was used in high-concentration digestive fluid from the beginning, there was a risk that the bacteria would become weakened, so the concentration was gradually increased from low-concentration digestive fluid.

The progress is shown in Table 3.

8-5 BOD volume load in activated sludge treatment aeration tank 0.86 K (J/m'・
All activated sludge treatment was carried out under heating at around 30°C under daily surface load conditions. The oral changes are shown in Table 4.

The pH decreased from 9.2 to 6.0 on the second day, indicating that biodegradation was rapidly progressing. The supernatant liquid of 5V30 was clear and brown, and the biota showed active movement of sympathetic and leisure-type organisms.

Table 4 Daily changes in activated sludge treatment 6) Coagulation and sedimentation The solid-liquid separated liquid after activated sludge treatment is brown in color, and both chromaticity and COD are high. Conventionally, ferric chloride and lime have been used as coagulants for the chemical treatment of coagulated sediment.In the case of this experiment, a mixed system of polyferric sulfate and slaked lime was the most effective. It was a target. For example, solid-liquid separation liquid 1
1 to 3 ml of undiluted polyferric sulfate 3%
At an addition amount of 30 ml of slaked lime solution, both the chromaticity and the decrease in COD become flat.

The results are shown in Table 5.

For example, the chromaticity increased from 3900 degrees to 500 degrees, and the decolorization rate was 87%, which was a good result. Also, COD is 760
decreased from ml/11 to 130 mlII,
The removal rate also reached 83%.

Table 5 Results of Coagulation Test 7 Activated Carbon Adsorption The chromaticity and COD removal efficiency of the coagulation-sedimentation-treated water by activated carbon adsorption are as shown in FIGS. 2 and 3. When the chromaticity of treated water is around 50 degrees, it is almost colorless to the naked eye. In addition, the pH of the treated water is around 8.0, and the COD is 30.
mf/l or less, BOD is also less than 30 mf/1.

That is, because the primary treatment (aerobic digestion treatment) and secondary treatment (activated sludge treatment) according to the present invention were carried out very smoothly, the tertiary treatment (physicochemical treatment) also produced even better results.

[Brief explanation of the drawing]

The first factor is the flow sheet of the undiluted human waste treatment method of the present invention, and Figure 2 is a graph showing the relationship between contact time and chromaticity during activated carbon adsorption treatment of coagulated sedimentation-treated water according to the present invention.
FIG. 3 is a graph showing the relationship between contact time and COD. Applicant: West Japan Johkasou Management Center Co., Ltd. Representative Patent Attorney Hiroshi Mori 3rd Department (1 [n119 (γ/L,)) (10 procedural amendments (Mutsu) March 11, 1981 Patent application No. 25224 3, Person making the amendment 4, Agent 〒710 6-fi Subject of amendment (υ Application, request for examination of application, and clear survey document Attachment 1 of the invention, title of the invention All 1 Processing of urine 2. The claim is completely missing, so 9 is corrected. [1] After biological treatment such as aerobic digestion and activated sludge treatment of human waste, physical processes such as coagulation and sedimentation, decolorization, and sterilization are performed. A method for treating human waste that involves chemical treatment, characterized in that activated sludge treatment is carried out using sludge produced from rice seedlings kept in a concentrated environment as seed sludge. 3) Meisho, page 1, lines 14 to 17 ``The present invention is disclosed...'' Replace J with the following sentence. ``The present invention relates to a method for processing human waste that enables complete, non-diluted treatment of human waste, and The purpose of this patent is to disclose a new method for efficiently purifying human waste in a short period of time to bring the water quality within legal measurement values without diluting it with water.'' 4) Page 6, line 3, ``... is obtained.'' Insert the following sentence next to ``As described above, the method of the present invention makes it possible to treat human waste completely without dilution, and also allows mixing of washing water, replenishment of evaporated water, and filtration as necessary. It is now possible to perform arbitrary dilutions at much higher concentrations than before, such as 2 to 3 times dilution."5) Same page, line 16, page 6, table 1, page 6. Inside, page 7, lines 5 and 12, page 8, table 2,
Page 10, line 5, table 4, page 11, table 5, 12
On the 5th line of the page, correct "PH" to II) H, J. 6) On page 7, line 10, correct the wording ``digestive mouth and neck'' and ``number of days for digestion.'' 7) On page 9, line 2, correct "same amount" to "same amount."that's all

Claims (1)

[Claims] 1 After biological treatment such as aerobic digestion and activated sludge treatment of human waste, physicochemical treatment such as coagulation sedimentation, decolorization, and sterilization? In the human waste treatment method, the human waste is completely subjected to aerobic digestion without being diluted with water, and then the digestive fluid is gradually increased in load, and the sludge is treated as sludge with all types of sludge that have been made with beneficial bacteria that have been acclimatized to a high-concentration environment. There are nine ways to do this.