KR20020083043A - Livestock sewage disposal system - Google Patents

Abstract

PURPOSE: A livestock wastewater treatment system using rotary biofilm filter is provided. CONSTITUTION: The system comprises a raw water tank(10) to collect wastewater discharged from livestock farming facility; a filtration tank(20) to remove impurities and suspended solids by chemical precipitation; a flow equalization tank(30) to stabilize the influent water flow fluctuation; a hollow fiber membrane filtration tank(90) and a rotary biofilm filter tank(40) to maximize the contact efficiency between wastewater and filter media; a compressor(50) to supply air to the hollow fiber membrane filtration tank(90) and to the rotary biofilm filter tank(40); a pH controller(80) and a temperature controller to control the pH and temperature of the wastewater in the rotary biofilm filter tank(40); a discharge tank(60) to discharge the treated water; and a pump(90).

Description

Livestock wastewater treatment system {Livestock sewage disposal system}

The present invention relates to a livestock wastewater treatment system, and more particularly to a livestock wastewater treatment system using a rotary biofilm filter.

As the standard of living has improved due to the recent economic growth, the dietary lifestyle has become westernized, and the ratio of grain-oriented diets to meat-oriented diets is gradually increasing. In order to meet these demands, the potential growth of livestock farming has resulted in the release of many pollutants, contaminating not only rivers but also water sources.

Livestock wastewater has a smaller discharge rate than other pollutants (0.6%), but the pollution concentration is very high, accounting for 19.9% of the total water pollution in terms of pollution contribution. In the Act on the Treatment of Sewage, Manure and Livestock Wastewater, which was revised in March 1997, the area subject to simple livestock wastewater septic tanks was expanded nationwide in certain areas, such as water supply protection areas. The management of livestock wastewater has been strengthened, including the establishment of livestock wastewater for the collection and transportation of livestock wastewater discharged from farms, by including a sports ground in dairy cattle breeding facilities.

As of 2001, effluent water quality standards of livestock wastewater treatment plant are regulated to below 30mg / l, COD below 50mg / l, and T-P and N-P below 60mg / l and 8mg / l. Currently used livestock wastewater treatment methods include storage liquid fertilization method, simple septic tank, composting method, sawdust fermented pigs, etc., but these are difficult to meet the discharged water quality standards of livestock wastewater treatment facilities, Although research is being conducted, the installation cost and the operation cost are high, so it is actually having a lot of difficulties in the field.

Existing processes for treating livestock wastewater are difficult to satisfy effluent water quality standards for preserving water quality of general rivers and water sources, and due to the poor financial infrastructure and lack of expertise in small scale livestock farms due to expensive installation and operation costs. Several problems are raised.

Therefore, it is necessary to develop a livestock wastewater treatment process using a biofilter that has a higher treatment efficiency than other processes that do not require professional operation management.

The biofilter was first considered in 1923 for the effective control of odors emitted by bach from wastewater treatment plants. This concept was first applied to the site in the 1950s to eliminate odors emitted by US and West German sewage treatment plants, and several countries in Europe, along with subsequent research, now effectively treat odors in the Netherlands and Germany. Fully settled with technology However, in the United States, the excellence of biofilters has not been recognized. Recently, research on biofilters and their practical applications are rapidly increasing due to rising energy prices and tightening air pollution regulations. In addition, there are cases where biofilters are applied not only to the atmospheric field but also to wastewater treatment, but there are few attempts to apply biofilters to the water treatment field in Korea. Although some domestic companies have introduced biofilters, they are currently being applied as a process of simply securing the existing activated sludge method.

The key technologies of biofilters are strain isolation and carrier development. Currently, if strains are not secured in Korea, royalties are paid and used in foreign countries. The development of carriers based on fly ash, diatomaceous earth, blast furnace slag has been made. Its size is very small.

The present invention was devised to solve the above problems, and an object of the present invention is to apply a livestock wastewater treatment system using a rotating biofilm filter to separate and fix the fine strains that are well adapted to the wastewater by applying a fibrous filter. To provide.

According to one aspect of the present invention, there is provided a wastewater treatment system for treating livestock wastewater generated in a livestock farm, comprising: a raw water tank (10) collecting wastewater discharged from the livestock facility; As a pretreatment method to easily maintain the wastewater of the raw water tank 10 and to utilize an existing septic tank, a filtration tank 20 for removing the contaminants and the suspended solids by chemical precipitation of the incoming contaminants and the suspended solids; A flow rate adjustment tank 30 for responding to the fluctuation of the severe inflow of the raw water tank 10; A hollow fiber membrane filter tank 90 and a rotary biofilm filter tank 40 for maximizing the contact surface efficiency with the wastewater flowing into the flow regulating tank 30; A compressor (50) for supplying air to the hollow fiber membrane filter tank (90) and the rotary biofilm filter tank (40); PH adjusting tank 80 for adjusting the pH of the wastewater in the rotary biofilm filter tank 40; A temperature controller 70 for maintaining a temperature of the rotary biofilm filter tank 40 at a predetermined temperature; A discharge tank 60 for discharging the wastewater treated by the rotary biofilm filter tank 40; In each of the tanks, characterized in that consisting of a pump 90 for supplying waste water to the next tank.

In addition, preferably the hollow fiber membrane filter tank 90 and the rotary biofilm filter tank 40, the inner space is formed of a porous or reticulated contact case that can flow and flow with the outside and smoothly the flow of air Circular supports (42,92) to optimally form the immobilized microorganisms using the livestock wastewater as nutrients; It is characterized by consisting of a rotating body (41,91) for rotating the plurality of circular support.

1 is a schematic block diagram of a livestock wastewater treatment system according to the present invention;

2 is a block diagram of a livestock wastewater treatment system according to an embodiment of the present invention,

3 is a perspective view of a rotating body in the filter tank of FIG.

Figures 4a, 4b is an illustration of the circular support of Figure 2;

<Description of Symbols for Main Parts of Drawings>

10: raw water tank 20: filtration tank

30: flow control tank 40: rotary biofilm filter tank

50: compressor 60: discharge tank

70: temperature controller 80: pH control tank

90: hollow fiber membrane filter tank

With reference to the accompanying drawings will be described in detail for the livestock wastewater treatment system of the present invention.

1 is a schematic block diagram of a livestock wastewater treatment system according to the present invention.

Referring to Figure 1, the raw water tank (10) collecting the wastewater discharged from the various livestock facilities, and the contaminants introduced as a pretreatment method that can easily maintain the wastewater of the raw water tank (10) and utilize the existing septic tank And a filtration tank 20 for removing the contaminants and the suspended matter by chemical precipitation of the suspended solids, a flow regulating tank 30 for responding to the fluctuations in the inflow of the raw water tank 10, and the flow regulating tank 30. The hollow fiber membrane biofilter 90 and the rotary biofilm filter tank 40 for maximizing the contact surface efficiency with the incoming wastewater and the pH control tank for adjusting the pH of the wastewater in the rotary biofilm filter tank 40 ( 80, and a discharge tank 60 for discharging the wastewater treated in the rotary biofilm filter tank 40.

When the amount of the waste water is large, the microbial cells of the rotary biofilm filter tank 40 react with each other competitively, so that it is difficult to maintain a certain concentration of microorganisms, so that the removal efficiency is reduced, and the flow rate is rapidly increased when cleaning in the livestock farm. 30) install.

In addition, the fractional molecular weight (MWCO) of the ultrafiltration membrane (U / F) filter 90 is 10,000 and 30,000, and has a sharp fractionation performance, and completely filters not only the microparticles of the treatment liquid but also microorganisms and bacteria of 0.01 micron. Can be.

U / F membrane is made of polysulfone, a heat-resistant resin, so it can be used at 90 ℃ hot water, and can be used in all areas of pH 1-14, so it can be washed with acid and alkali.

In addition, it is not affected by microorganisms and has excellent pressure resistance and durability by the double skin structure and the buffer layer effect connecting the skin and the support layer.

The rotary biofilm filter of the rotary biofilm filter tank 40 is currently mainly used to remove odors in chemical processes or wastewater treatment plants and sewage treatment plants. Recently, foreign biofilm filters have been applied to water treatment in foreign countries. The research to apply the biofilm filter process to water treatment is still insignificant.

At the heart of the rotary biofilm filter process is the strain and carrier. It is economical to separate the strain having excellent decomposition ability of the pollutant to be treated, and to apply to livestock wastewater treatment process by providing a carrier having a low porosity and high porosity.

Therefore, the rotary biofilm filter process is immobilized on the fibrous carrier to parasitic in the carrier, so it is possible to operate only by adjusting only the appropriate temperature and pH, so that professional operation is not required when installed in a general livestock farm.

3 is a perspective view of a rotating body in the filter tank of FIG. 2, and FIGS. 4A and 4B are exemplary views of the circular support of FIG.

The hollow fiber membrane filter tank 90 and the rotary biofilm filter tank 40 are fibrous in a cylindrical support (see Fig. 4a) or cylindrical grill mesh (see Fig. 4b) (42,92) containing holes of plastic material. Surround the carrier and inoculate the isolated strains.

And the air coming out of the bottom of the hollow fiber membrane filter tank 90 and the rotary biofilm filter tank 40 is a cylindrical support is introduced into the thin hole of the cylindrical grill mesh (42,92) to activate the strain. At this time, in order to increase the contact area between the immobilized microorganism and the wastewater, the rotary plates 41 and 91 are installed to enable the rotation of the cylindrical support or the cylindrical grill mesh attached to the upper layer of the hollow fiber membrane filter and the rotary biofilm filter. If it is slow, the removal efficiency is low, and if it is fast, desorption of immobilized microorganisms occurs, so it is operated by deriving an appropriate rotation speed.

Referring to the operation and effect of the present invention configured as described above, Figure 2 is a schematic diagram of a livestock wastewater treatment system according to an embodiment of the present invention.

1 is configured to include a temperature controller 70 for adjusting the temperature conditions for optimal growth of microorganisms in the rotary biofilm filter tank 40, and also for the flow of wastewater from each tank to the next tank A pump 11 is provided, and a compressor 50 for supplying air to the hollow fiber membrane filter tank 90 and the rotary biofilm filter tank 40 is provided.

One of the key technologies of the rotary biofilm filter tank 40 is the separation of rainwater strains that are well adapted to the treated wastewater. In order to develop microbial strains for inoculation of microorganisms, sulfur and nitrogen gas were integrated and cultured alone and mixed gas, using activated sludge as a microbial separation source, sludge treatment plant sludge, waste coal mine and hot spring soil as separate sources. After microorganisms are separated using various kinds of media, strains having excellent activation ability are selected from various strains purely isolated.

The carrier is a fibrous carrier, not a particulate carrier made of fly ash, diatomaceous earth, blast furnace slag or the like, which are widely used so far. By applying a fibrous carrier 42 made of nylon, polypropylene, polyethylene, or the like, the contact area is increased during wastewater treatment, and microorganisms immobilized on the carrier are not detached even during aeration. Excellent porosity of polypropylene, nylon, polyethylene, etc., which is used as a zero material, for wastewater and wastewater. It consists of a carrier.

The most important thing in the rotary biofilm filter 40 is a method of immobilizing the isolated strain on the carrier. When the strain is not properly immobilized on the carrier, the microorganisms immobilized on the fibrous carrier are detached and the concentration of the strain of the rotary biofilm filter 40 is reduced and suspended matter is formed.

The method of immobilizing the microorganism includes an attachment method, a crosslinking method, a capture method and an encapsulation method, and the attachment method refers to an immobilization technique in the form of being attached to a carrier surface by natural adhesion or chemical bonding of cells. It refers to a method of attaching and grouping chemicals and microorganisms with functional groups. In addition, the capture method is a method to be trapped in the pores of the carrier, the encapsulation method is a technique to coat the microorganisms in the lattice of the gel (Gel) or the coating of the polymer (polymer). Among these immobilization methods, a specific surface area is increased and a method capable of immobilizing the isolated microorganisms on the developed carrier is selected. In the present invention, by developing a support 42 or a mesh grill 42 capable of supporting a fibrous carrier, the microorganisms immobilized on the fibrous carrier increase the contact rate with the air introduced into the support hole, thereby improving wastewater treatment efficiency. Increase.

Therefore, the microorganism can maximize the contact area between the fibrous carrier and the wastewater, and minimize the desorption of the immobilized microorganisms to maximize the removal efficiency.

That is, the existing circular support has a desorption phenomenon of microorganisms due to the impact of the flow of sewage and the flow of air bubbles, and when such desorption occurs, the biological oxygen demand and the amount of suspended solids increase, and the waste water purification ability is reduced.

Therefore, the inner space is a porous or reticulated contact case in which water flow and bubbles can flow to the outside so that the immobilized microorganisms can be protected from the impact of the flow of sewage and the flow of air bubbles. Air from the bottom is introduced into the thin hole of the support or grill mesh 42 to activate the strain. In this case, in order to increase the contact area between the immobilized microorganism and the wastewater, the rotary plate 41 is installed to rotate the cylindrical support agent or the cylindrical grill mesh 42 attached to the upper layer of the rotary biofilm filter, and rotates at a constant speed.

That is, the livestock wastewater introduced by a certain amount by the flow control tank 30 first removes various bacteria and foreign substances through the hollow fiber membrane filling tank 90, and the various types of chemicals introduced are rotated biofilm filter tank 40. Will be removed from.

At this time, the air is supplied through the compressor 50 in order to increase the efficiency of removal, and in particular, the proper pH is adjusted through the pH adjusting tank 80 to properly grow microorganisms of the rotary biofilm filter tank 40. By discharging livestock wastewater as efficiently as possible.

As described above, according to the present invention, the livestock wastewater treatment process using the rotary biofilm filter is more economically applicable to livestock farms to effectively cope with the ever-increasing environmental regulations and import and opening of agricultural and livestock products. As it is a process that can efficiently and efficiently treat livestock wastewater, it is expected to be fully applicable to wastewater treatment plants including sewage terminal treatment plants in the future. There is an effect that can be widely used in wastewater treatment plants.

Claims (5)

In the wastewater treatment system for treating livestock wastewater generated in livestock farms, A raw water tank 10 collecting wastewater discharged from the livestock facility; As a pretreatment method to easily maintain the wastewater of the raw water tank 10 and to utilize an existing septic tank, a filtration tank 20 for removing the contaminants and the suspended solids by chemical precipitation of the incoming contaminants and the suspended solids; A flow rate adjustment tank 30 for responding to the fluctuation of the severe inflow of the raw water tank 10; A hollow fiber membrane filter tank 90 and a rotary biofilm filter tank 40 for maximizing the contact surface efficiency with the wastewater flowing into the flow regulating tank 30; A compressor (50) for supplying air to the hollow fiber membrane filter tank (90) and the rotary biofilm filter tank (40); PH adjusting tank 80 for adjusting the pH of the wastewater in the rotary biofilm filter tank 40; A temperature controller 70 for maintaining a temperature of the rotary biofilm filter tank 40 at a predetermined temperature; A discharge tank 60 for discharging the wastewater treated by the rotary biofilm filter tank 40; Livestock wastewater treatment system comprising a pump (90) for supplying wastewater from each tank to the next tank. The method of claim 1, wherein the hollow fiber membrane filter tank, A circular support 92 formed of a porous contact case in which an inner space flows to the outside and water and bubbles can be flowed smoothly; Livestock wastewater treatment system comprising a rotating body (91) for rotating the plurality of circular supports. The method of claim 1, wherein the hollow fiber membrane filter tank, A circular support 92 formed of a mesh contact case through which the inner space can flow with the outside and water flow and bubbles; Livestock wastewater treatment system comprising a rotating body (91) for rotating the plurality of circular supports. The method of claim 1, wherein the rotary biofilm filter tank 40, Circular support 42 to form an internal space is made of a porous contact case that can flow and flow and bubbles to the outside to facilitate the flow of air so that the immobilized microorganisms nutrients to the livestock wastewater nutrients can be optimally formed Wow; Livestock wastewater treatment system comprising a rotating body 41 for rotating the plurality of circular supports. The method of claim 1, wherein the rotary biofilm filter tank 40, Circular support 42 to form an internal space is made of a mesh contact case through which water and bubbles can flow to the outside to smoothly flow the air so that immobilized microorganisms nourish the incoming livestock wastewater as nutrients. Wow; Livestock wastewater treatment system comprising a rotating body 41 for rotating the plurality of circular supports.