KR20000072420A - Treatment method for livestock sewage and method of paddy rice fertilizer - Google Patents

Abstract

PURPOSE: Solid composting and fertilizer for water are provided to separate floating substances in highly concentrated livestock waste water without having inorganic phosphate or heavy metal by a solid-liquid separation method for producing high quality organic fertilizer. CONSTITUTION: A solid-liquid separation method of high concentration livestock waste water is performed by inputting sulfuric acid, hydrochloric acid and amino acid into the high concentration livestock waste water and by controlling pH 6.5-7. Active carbon powder or raw lime powder is input into the waste water and is adsorbed floating substances, nitrogen, phosphate or heavy metal. Oxidizing agents like PAC, aluminum oxide sulfate are input and aggregated by using a polymer aggregator after controlling pH 6.0-6.5. Floating substances are floated by using pressurizing floating tank. The solid-liquid separation method separates solid after passing through a screen. The solid-liquid separated colloidal solid is input to an aerobic fermenting system like ventilating fermenting tank, stirring-type fermenting tank or circular fermenting tank by mixing and stirring fly ash and waste wood for controlling brine rate, ventilation and coal quality rate proper to the aerobic fermentation.

Description

Treatment method for livestock sewage and method of paddy rice fertilizer}

The domestic livestock wastewater discharged from domestic farmhouse 567 thousand lakes is about 197 thousand tons per day, which is about 7720 thousand tons per year.

According to the law on the treatment of sewage manure and livestock waste water, a person who intends to install a livestock house must obtain permission to install livestock manure treatment facilities of the municipal government or report to the mayor of the mayor according to the scale of the livestock, and install a facility that treats discharged water quality standards or less. It was. Since 1991, the government has established a joint livestock wastewater treatment facility as a national government support project and promoted the treatment project to jointly collect and treat wastewater generated from small-scale livestock farms under license and report. Twelve locations are in operation, and 29 are under construction and commissioning. Currently, most of the livestock wastewater treatment plants have a BOD 5000mg / l facility design standard by the method of discharging the wastewater after purification, and the average BOD of the influent wastewater is 20000 ~ 30000mg / l. This problem is pointed out as a problem of the system, and it is pointed out that it is difficult to treat the discharge water quality standards such as BOD, COD, nitrogen, and phosphorus, and only waste water of 50% or less of facility capacity is treated. Livestock manure is about 17% of industrial waste emissions, and the high concentration of biological oxygen demand (BOD) is 47% of all industrial wastewater. When discharging these livestock wastes without proper treatment, it causes water quality deterioration, groundwater pollution and eutrophication of lakes, and contaminates water supply and agricultural water as well as destroys pleasant living environment such as odorous leachate pest damage. Conventional methods for treating high concentration livestock wastewater include active sludge method, storage liquid fertilization method, sprinkling water filter method, and composting method.However, the method for efficient solid-liquid separation of large-scale livestock wastewater is simply neutralized to agglomerate solids. The separation efficiency of suspended solids did not exceed 30-40%.

As a result, we invest a lot of research and technology development in the treatment method of high concentration livestock wastewater at home and abroad, but there are limitations in technology, so we have to revise the policy on livestock wastewater treatment and restrict the livestock raising or strengthen the wastewater discharge water quality standard. Technology development has been pointed out as the biggest problem for stable development of livestock industry as well as environmental conservation.

Unlike domestic wastewater and factory wastewater, livestock wastewater does not contain inorganic phosphorus or heavy metals as a high concentration of organic components, and it is easy to ferment and decompose microorganisms, so it is possible to resource it with high quality organic fertilizer. Therefore, avoid the method of purifying and discharging BOD 20000 ~ 30000mg / l high concentration livestock wastewater flowing into the livestock wastewater treatment plant forcibly and complying with BOD 5000mg / l. It is to provide a solid-liquid separation technology for separating suspended solids contained in high concentration livestock wastewater on the basis of water quality.

Treating suspended solids in high concentration livestock wastes with low chemical treatment, separating 70-80% of solids and nitrogen phosphorus and composting and discharging solids with 15 to 20% of colloidal material by weight of total wastewater by composting and recycling wastewater To reduce treatment costs, maximize the treatment capacity of livestock wastewater from which solids are removed with low concentration wastewater, and provide a method for solid-liquid separation and solid composting of environmentally-friendly high concentration livestock wastewater to promote efficient treatment methods under the regulation of discharged water quality. .

In the present invention, the fly ash and waste wood are pulverized to adjust the water content, breathability, and carbon content (C / N) at an initial water content of 60 to 65% suitable for aerobic fermentation of the colloidal material having a water content of 70 to 80%. Wood flour, bark meal, wood chip (Moisture regulating agent No. 0220210) specially prepared by mixing and stirring, into the ventilation fermentation tank, stirred fermentation tank, other aerobic fermentation system and injecting air 70 ~ 85 The fermentation was carried out at a high temperature of ℃ to produce a compost within a short time and by adding the nutrients necessary for paddy soil improvement to reduce to the soil as a water fertilizer to achieve the object.

The configuration of the present invention will be described below.

1 is a flow diagram of solid-liquid separation of high-estimate wastewater

2 is a composting process diagram of the solids

The present invention consists of a process for separating suspended solids, nitrogen and phosphorus from high concentration livestock wastewater, a process for composting separated colloidal solid matter, and a process for purifying and discharging the solid-liquid separation wastewater into an existing livestock wastewater purification plant. The present invention consists of a solid-liquid separation process and a composting process of solids.

Solid-liquid separation process of the wastewater from the primary storage tank by installing two reservoirs that can store the amount of wastewater treated every day according to the facility capacity of the livestock wastewater treatment plant; Acid and amino acid liquids are used in livestock wastewater to reduce the pH to 7 ~ 6 and 5, which are weakly acidic, causing oxidation catalyst reactions of suspended solids, nitrogen, and phosphorus in the wastewater, and suspended solids using activated carbon powder or quicklime powder. After adsorbing; Adjust the pH to 6, 0 to 6, 5 while adding an oxidizing agent such as PAC or alumina sulfate; A method of chemically treating solids with high efficiency and solid-liquid separation efficiency by flocculating with a polymer flocculant and then using a floating flotation flotation to float suspended matter and passing solids through the screen. About 80% of the suspended solids contained in the high concentration livestock wastewater are separated by coagulation of 10 ~ 20% by weight of wastewater, and the water content is controlled by the initial water content of 60 ~ 65%, and the air permeability and carbon mass rate (C / N) are controlled. Mixing and stirring fly ash, waste wood, bark flour, wood chips or specially prepared moisture control material (Patent No. 0220210) for the purpose of grinding; It enters into a ventilated fermentation tank, a stirred fermentation tank, and other aerobic fermentation systems, and fermentation proceeds at a high temperature of 70-85 ° C. Therefore, harmful pathogens, parasites, and weed seeds are killed. Compost through the property in an average of 10 to 15 days per year; Water fertilizer is prepared by adding paddy soil improver and nutrient to aerobic fermentation compost;

Hereinafter, the present invention will be described in detail by way of examples.

Example 1; Solid-liquid Separation of High-Livestock Wastewater and Composting of Solids

First process; Oxidation catalyst reaction step

The pH is adjusted to 6, 5-7, 0 by administering 1, 0-1, 5ml of oxidizing agents such as sulfuric acid and hydrochloric acid to 200ml of wastewater storage tank.

When the oxidant is directly injected into the livestock wastewater storage tank, bubbles are generated rapidly because the oxidant is ionized with the organic matter of the livestock wastewater and the combined sludge rises due to the specific gravity difference.

Therefore, these bubbles make it difficult to operate the adsorption chemical process efficiently. In order to overcome these disadvantages, the oxidant is gradually added to the weak acid through the pretreatment process.

Second process; Adsorption Process Step

It is a process of adsorbing fine suspended solids, nitrogen, phosphorous, and chromatic substances by using activated carbon powder or quicklime powder in livestock wastewater which has undergone oxidation catalyst reaction step. In order to homogenize this reaction, the stirrer was installed and pH was adjusted to 6, 0-6, 5% using PAC, alumina sulfate, etc. which are oxidizing agents.

Third process; Pressurized Flotation Flocculation Process

Immediately after the adsorption reaction is carried out, the flocculant is floated using the polymer flocculant to flocculate the flocculant, and then the operation of separating the solid matter momentarily through the pressure relief tank and the screen is a simple and highly efficient chemical treatment method.

Fourth process; Mixing of moisture control material

70-90% by weight of fly ash and 10-30% by weight of pulverized wood powder were mixed and mixed in order to control the water content, breathability, and carbon content suitable for aerobic fermentation in the colloidal solids having a water content of 70-80% of solid-liquid separation. It was put into the fermentation system.

Fifth process; Fermentation Process

The fermentation system is a tunnel fermenter with a pit length of 60 to 100m, a width of 4 to 8m and a depth of 1, 5 to 2, 0m, a round fermentation system of 10 to 25m in pit diameter and a depth of 2, 0 to 2, 5m depending on the compost production capacity. Pipeline that can inject 20 ~ 30㎥ of mixture material per day and force air into the bottom of fermenter by using ventilated fermentation system with pit height 2, 0m, width 2, 5 ~ 3m, length 5 ~ 6m Using a powerful blower installed in the fermenter side connected to the air supply for the fermentation drying simply 24 hours. In winter, heat is supplied by heat pipe to help activate aerobic microorganisms, and it lasts 5-7 days at high temperature of 70-85 ℃ during fermentation period.After 10-15 days, water content 40% and internal temperature of fermentation tank are 30-40 ℃. Fermentation was completed.

6th process; Water Fertilizer Manufacturing

The fermented wood pieces are selected by a circular screen under the manufacturing process in the fifth step, and recycled with an initial mixing agitator. The fermentation compost is 60 to 70% by weight, 10 to 20% by weight of fly ash as a soil improvement agent and 10 to amino acids as nutrients. 20% by weight of 20% by weight in a PE bag to prepare a fertilizer for water.

Sulfuric acid was added to 500ml of high concentration livestock wastewater to adjust pH to 6, 5 ~ 7, 0, slightly acidic, and 3ml of PAC or alumina sulfate was adjusted to pH 6, 0 ~ 6, 5 to treat BOD, TN (total Nitrogen) TP (total phosphorus) is removed more than 80%, and pretreatment with activated carbon powder recovers 85 ~ 90% of BOD, TN, TP and recycles it for composting into colloidal solids, and purifies low concentration wastewater pretreated by solid-liquid separation. It is an eco-friendly and useful invention that increases efficiency.

The water fertilizer prepared by the method of the present invention is a complex soil improver for water, which contains soil microorganisms, organic matter, silicic acid, lime, koto, and trace elements, which are insufficient in paddy soil, and has soil, compost, siliceous fertilizer, trace amount in paddy soil. It is characterized by the technology of manufacturing labor-saving compound fertilizers with the effect of simultaneously applying elemental and fertilizer trielements (nitrogen, phosphoric acid, and garlic) and its fertilizers.

Test institute; Institute of Agricultural Science and Technology, Korea Household Goods Research Institute.

Claims (2)

Sulfuric acid, hydrochloric acid and amino acid are administered to high concentration livestock wastewater to adjust pH to 6, 5 ~ 7, 0. Activated carbon powder or quicklime powder is added to the wastewater to adsorb suspended solids, nitrogen, phosphorus and heavy metals. After adjusting the pH to 6, 0 ~ 6, 5 by adding oxidizing agent, agglomerate using polymer coagulant, and then using floating flotation tank to float the suspended solids and go through the screen to separate solids. Separation method. Aerobic fermentation such as ventilated fermenter, stirred fermenter, round fermenter, etc. A method for producing a complex soil improver for water, prepared by adding nutrients necessary for paddy soil to compost fermented for 10 to 15 days by aerobic high temperature fermentation at 70 to 85 ° C. in a system.