KR900001608B1 - Method for obtaining fertilizer from waste water treatment - Google Patents

Abstract

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Description

Composting method of high concentration organic sewage

1 is a process flow chart of the present invention.

2 is a conventional wastewater treatment process diagram.

* Explanation of symbols for main parts of the drawings

1: Input tank 2: Settlement place

3: grinding machine 4: drum screen

5: storage tank 6: adjusted reactor

7A: pH adjusting tank 8: coagulation reaction tank

9: dehydrator 10: mature composting device

11: sedimentation tank 12: water tank

13: incinerator 14: blower

15: squary press 16: sterilization tank

According to the present invention, the liquid portion becomes a purified water and the solids are high quality organic fertilizers by separating the solids by supernatantly corroding manure and livestock manure or other high-concentration organic sewage that occupy a large part as an environmental pollution source. It relates to the composting method of sewage.

It is an object of the present invention to produce a high-quality organic fertilizer suitable for agricultural use by completely separating the solid-liquid separation without adding a large amount of dilution water for organic sewage treatment, and at the same time it is possible to recycle the separation solution that meets the water quality inspection standards for industrial use. It is to solve the serious problem of polluting the environment by the discharge of organic sewage and to avoid the use of dilution water, to simplify and simplify the facility, and to solve the difficulties of facility management cost and management technology.

As a conventional method for treating high concentration organic sewage, there has been a standard activated sludge method or a method of partially applying the same. For example, according to FIG. 2, a conventional manure treatment process using activated sludge process removes various contaminants in the collected manure sewage, and puts it in a storage tank to homogenize the liquidity and adjust the pH as necessary, and then dilute 10-20 times as much. When water is added to the pretreated manure sewage and diluted and transferred to the aeration tank 18, the manure sewage is activated by the action of aerobic bacteria group (activated sludge) by the air blown by the blower 19, so that organic matter is oxidatively decomposed and magnetized. Solids are naturally precipitated if they are transferred to the settling tank 20 and left as it is for a certain period of time. The isolated symbolic water is sterilized and discharged, and the precipitate is concentrated and landfilled or incinerated. However, this method is difficult to carry out where there is no water source because it adds a large amount of dilution water to organic sewage, and the total sewage capacity is increased by adding dilution water, so the facilities such as aeration tank sedimentation tank are enormous and the power cost for pumping aeration is increased. Not only does it increase the maintenance and operating costs, but it also has the disadvantage of requiring highly skilled techniques for maintenance, as well as contaminating water resources by discharging incompletely treated sewage, securing water sources and reclaiming dehydrated solids, There were various problems, such as securing a site for incineration. The present invention is to solve this problem of the prior art, so that the dilution water is not used in the treatment of organic sewage, such as manure, so as to simplify the treatment agent facility and to reduce the cost of facility management cost management cost, and to ease operation management. At the same time, complete solid-liquid separation yields purified water that meets water quality standards, and solids (dehydrated cakes) can make a significant contribution to agriculture by making compost, a good organic fertilizer.

The present invention is described in detail according to the processing procedure according to the accompanying drawings 1 as follows.

1) Pretreatment of Organic Sewage

Collected organic filthy water is organic filthy water by using a drum screen (4) and a squary press (15), etc., through which the sand is removed from the settling basin (2) and the crusher is crushed by the crusher (3). The contaminants contained therein are removed and temporarily stored in the storage tank 5 to homogenize the liquid phase.

2) Super corrosion corrosion treatment

Superficial corrosion generated by oxidative decomposition of organic sewage by active propagation of aerobic bacterial groups by continuously supplying an appropriate amount of air to the blower 14 by pre-injecting organic sewage to be treated to the control reactor 6 equipped with an aeration device. Prepare in advance so that a suspension of material is formed.

In the present invention, "bio-corrosive substance" is a protein, carbohydrate, etc. in the organic sewage by the microorganism in the decomposition and resynthesis or metabolic products of the kinoid substance and amino acids (COOH and NH _2, carboxyl and amino groups in the same molecule ) Is produced mainly as a substance, and it is a substance produced in a liquid state by decomposing even a substance having a low molecular weight of a poorly soluble organic substance such as lignin by a microorganism. In addition, "suspension of superbiodegradable substance" refers to an aqueous solution of the superbiode extracted after the generation of the parasitic corrosive material in the present invention has a strong organic sewage purification ability.

A high concentration of organic sewage to be treated is added to 1/6 times the suspension of the suspension so that the BOD load in the suspension is 0.1-0.25 Kg BOD / Kg MLSS.d, and the blower 14 When aeration is caused, super erosion of organic sewage proceeds. The load value may be added or decreased depending on the concentration of organic effluent water and the removal rate of nitrogen, and the number of treatment days may be changed within 1-3 days in accordance with the above conditions.

Since the mixed liquid suspended solids concentration (MLSS) is about 20,000 to 22,000 ppm in the suspension of the supernatant of the present invention compared to the conventional activated sludge method (1,500-2,000 ppm), it is not necessary to carry back the activated sludge into the suspension. Since the amount of the suspension of the super-corrosive substance with low BOD is 6-10 times higher with respect to the amount of high organic sewage, the BOD in the control reactor 6 is lowered when mixing, so that dilution water is not necessary and the treatment can be performed in a short time. The process of completely oxidizing organic substances in organic sewage is as follows. BOD oxidizing organisms ingest organic substances in organic sewage, oxidize biochemically by oxygen to CO ₂ and H ₂ O The assimilation process takes place at the same time as the ingested organic matter is converted to the cells by the microbial bioreaction. At this time, the chemical formula of the oxidation process and assimilation process is as follows.

Oxidation Process C _X HyO _2- → CO ₂ + H ₂ O- △ H

Assimilation process C _X H _y O _z + NH ₃ + O _2- → Cell + CO ₂ + H ₂ O- △ H

The determination of the completion of the supercorrosion treatment is performed by lowering the pH electrical conductivity, increasing the dissolved oxygen value, lowering the ammonia nitrogen (NH ₄ -N) and the expression of nitrogen oxide (NO _X -N), or just before it. This is accomplished by inherent numerical values indicating the parasitic erosion of sewage components, such as a decrease in COD BOD values, a reduction in E. coli or common bacterial populations, and the emergence of native protozoa.

3) Agglomeration of super corrosive substances

When the supernatant corrosion of organic wastewater is completed in the reactor 6, the same amount (1-1 / 6 times of the suspension) as the amount introduced first is transferred to the coagulation reactor 8 through the mixing reactor 7 and the reactor ( In 6), the superbiocorrosive treatment is continuously carried out through the same process by leaving the suspension of the supercorrosive material as the first and then adding the organic sewage to be treated while adjusting the BOD load. Organic sewage transferred to the coagulation reactor (8) was supercorroded, so if necessary, adjust the pH to 9-10 with a pH adjuster (NaOH), and then add a predetermined amount of inorganic coagulant such as ferric chloride to pH 4.0- Solid-liquid separation is carried out at around 4.5. The agglomerated solid content is dehydrated by the dehydrator 9 to obtain a dehydrated cake and a desorption liquid.

4) post-treatment

Dehydration cake (dehydration rate 50-80 depending on the dehydrator) is adjusted by the mature composting device (10) to adjust the pH, temperature, moisture content, blowing amount, etc. Proper operation management increases the corrosiveness to produce progressive corrosive to produce mature compost. The treatment period is 45-60 days for the addition of crude oil such as sawdust and rice straw as the original moisture modifier, and 20-30 days for the addition of products (compost) or other minerals without the addition of crude oil. PH control of the desorption liquid from the dehydrator (9) and removal of a small amount of solid sludge contained in the washing water mixture which washed the filter, and then transferred to the settling tank (11) for settling for 3-4 hours to obtain clean neutral symbol water. Since some of them are transferred to the water tank 12 for reuse as the washing water of the filter, the remainder is discharged after a predetermined sterilization treatment. The small amount of concentrated sludge settled in the settling tank 11 is returned to the mixing adjustment tank 7. The present invention is processed by each process as described above, but the experimental operation of the case of human manure in high concentration organic sewage is as follows.

1) pretreatment of manure

The sand contained in any amount of collected manure brought in by Vacuum Carriage is removed from the sedimentation basin, the debris is sorted out by a drum screen, and stored in a storage tank to homogenize the manure. The period of storage in a storage tank is not limited, but is at least 1 day. Examples of water quality of the homogenized manure wastewater are as follows.

pH: Average 8.0

S.S: Average 6,500 PPM

BOD: Average 6,100 PPM

COD: Average 4,100 PPM

2) Super erosion treatment

In the control reactor, a suspension of supercorrosive substances obtained by oxidizing manure is prepared in advance. The manure waste water homogenized in the pretreatment process is introduced and mixed into the control reactor so as to have a predetermined load, and a predetermined amount of air is supplied to the aeration device. At this time, the adjusted load amount was 0.1-0.25 kg BOD / kg MLSS.d, and the amount of manure input was 1-1 / 6 times the amount of the supernatant corrosive suspension, and the supply amount was 3 m 3 / m 3 .Hr. The treatment period can be adjusted in 1-2 days. The manure wastewater added to the suspension of the controlled reaction tank undergoes oxidative decomposition and magnetization of soluble substances due to purification by various aerobic bacteria, and supernatant growth of liquid phase with growth of sludge. Judgment criteria for the completion of HT are as follows.

pH: below 8

Dissolved Oxygen Value: 0-0.5mg / l rises above 1mg / l

On or shortly before the emergence of nitrogen oxides

Reduction of Escherichia Coli and Common Bacteria

The emergence of indigenous protozoa such as trichinella

Lowering the BOD COD Value

3) flocculation treatment

When it is determined that the supercorrosion has been completed, transfer to the flocculation reactor as much as the first dose and re-introduce the homogenized manure wastewater to the control reactor again. In the coagulation reactor, the pH is adjusted by adding a regulator (NaOH), and then 1,500-6,000 ppm is added to an inorganic coagulant such as ferric chloride (Fecl ₃ ) so that the pH becomes 4-4.5. The agglomerate is solid-liquid separated with a vacuum dehydrator on a 3H ³ / Hr scale to obtain a dehydrated cake and desorption solution.

4) Ripe composting and post-treatment

After adding sawdust as a moisture modifier to the dehydrated cake with a water content of 75-85%, composting was performed for 45 days in a mature composting device, and as a result, 8-13 kg per 1 kg of manure (excluding 50% of moisture modifier) Could get The desorption solution and the follicle washing water are settled in the sedimentation tank, and the supernatant water is discharged after sterilization or used as industrial water, and the precipitated solid sludge is transferred to the mixing control tank and the above treatment is repeated. At this time, the water quality of the discharged water was suitable for the water quality standards as follows.

pH 5.8-8.6

S.S 30 ppm or less

BOD 20 ppm or less

100 coli / cm3 or less

In the same experiment described above, it was found that the treatment method of the present invention, which was previously defined, has the following results (Table 1 and Table 2) as compared with the conventional treatment method.

TABLE 1

TABLE 2

The effects expected by the present invention are as follows.

(1) The present invention can be promoted by oxidative decomposition and granulation according to the superbiodegradation of high concentration organic sewage components in the absence of dilution, and at the same time by promoting the reaction of growth, flocculation and oxidation of suspended sludge in the mixed solution. Since the supernatant is made after the formation of supercorrosive material, the inorganic coagulant enlarges the microparticles and facilitates the separation of the solid solution. The resulting purified water meets the water quality standards and can be reused as discharged or industrial water. It is a groundbreaking way to make a significant contribution to soil improvement in agriculture.

(2) Furthermore, the present invention maintains various activities of microorganisms, promotes superbiodegradation, and performs coagulation and dehydration for efficient purification even without using a large amount of dilution water, which is considered as conventional common sense. In particular, the operation management surface is much simpler, the facility operation personnel can be reduced, and advanced knowledge is required, since there is no need to consider the sedimentation properties of the sludge in the sedimentation tank, which is the biggest problem in the operation of the conventional activated sludge method. It does not have the advantage.

(3) In the present invention, since the dilution water is not used, the facility is not enlarged and the facility can be constructed at a lower cost than the conventional one, and the operation cost can be reduced, and the water purifying the water quality standard can be obtained. As it can produce compost, it has the advantage of making a great contribution to the prevention of environmental pollution and the development of soil in farmland.

Claims (1)

The collected sand and contaminants in the high concentration organic sewage are removed by a known settling paper (2), crusher (3), drum screen (4) and stored in a storage tank (5) to homogenize the liquidity, and an adjustment reaction tank with an aeration device ( 6) pre-preparation of the suspension of supernatant corrosives generated by oxidation of high concentration organic sewage and injecting the homogenized high concentration organic sewage into a predetermined amount so that the BOD load of the suspension becomes 0.1-0.25Kg BOD MLSS.d. After mixing and aeration, the supernatant is corroded, and the same process is carried out by transferring the same amount of the supercorroded organic sewage to the coagulation reaction tank (8) in the entire suspension in which the supernatant is completed. The organic sewage transferred to the coagulation reaction tank (8) is repeated, and after adjusting the pH in some cases, the inorganic coagulant is added and coagulated to solid-liquid separation with a dehydrator. High concentration composting process of organic waste water, characterized in that the cake produced organic fertilizer nophyeo the busikdo in mature compost apparatus 10 into a tablet.

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