CN101492229B - Pulling flow type anaerobe reactor - Google Patents

Abstract

The invention belongs to the field of agricultural environmental protection and relates to a plug-flow anaerobic bioreactor for sewage treatment. The plug-flow anaerobic bioreactor of the present invention is realized by the following approach. The pretreated feed liquid is transported to the warming tank for temperature increase. The heated feed liquid enters the feed tank from the overflow pipe, and then It is transferred from the feed port in the feed tank to the inside of the reactor. The feed liquid fully contacts with the film-coated carrier, planktonic anaerobic microorganisms and activated sludge in the reactor, and then is pushed into the water pressure room. The overflow pipe is discharged, and the sludge is taken away by the suction truck. The advantages and positive effects of the present invention: the warming tank increases the energy utilization rate of the feed liquid, improves the acidification, hydrolysis and methane production process of the anaerobic reaction, shortens the retention period of the feed liquid, and improves the processing capacity and treatment effect of the system; The design of the film-covered carrier and the mud retaining wall in the reactor increases the number of anaerobic microorganisms in the reactor and promotes the conversion efficiency of organic matter in the feed liquid.

Description

A plug-flow anaerobic bioreactor

【Technical field】

The invention belongs to the field of agricultural environmental protection and relates to a plug-flow anaerobic bioreactor for sewage treatment.

【Background technique】

With the acceleration of the construction of new rural areas in my country and the rapid development of intensive pig farming, the large amount of wastewater generated in the process of breeding development is far from being absorbed by the land naturally, and constitutes a serious threat to the atmosphere, soil, groundwater and other receiving water bodies. Serious threat of pollution, aquaculture pollution problem has aroused the country's great attention. However, pig farming is a low-profit industry, which limits the investment capacity of sewage treatment. This requires a sewage treatment method with low investment, good treatment effect, low operating cost, and certain economic benefits.

Although the sewage treatment technology based on the aerobic activated sludge method has a high pollutant removal rate, it occupies a large area, and the basic investment and operating costs are high; while the anaerobic biological treatment technology has a high resistance to organic loads; it does not require exposure Gas oxygen supply, saving operating costs; less sludge output and easy to handle; low energy consumption; the biogas generated in the anaerobic process can be recovered as clean energy and utilized, and has become an energy-saving technology that is widely concerned at home and abroad.

The activity and quantity of microorganisms in the anaerobic bioreactor directly affect the purification efficiency of the reactor, and the temperature directly affects the activity, quantity and generation cycle of microorganisms in the reactor. Generally speaking, under the same other process conditions, in the range of 0°C to 60°C, the reaction rate will increase by about 2 to 4 times for every 10°C increase in temperature. Therefore, increasing the temperature of the fermentation raw materials in the reactor to the optimum range will effectively improve the reaction efficiency of the system.

The improved plug-flow anaerobic bioreactor described in the present invention, supplemented by solar double-effect warming technology and film-covered carrier technology, helps to increase the temperature of fermentation raw materials, promote the activity of anaerobic microorganisms, and significantly accelerate the anaerobic process. The acidification, hydrolysis and methane production process of the reaction shorten the retention period of the feed liquid and improve the processing capacity and processing effect of the system.

【Content of invention】

The plug-flow anaerobic bioreactor of the present invention is realized by the following approach. The pretreated feed liquid is transported to the warming tank for temperature increase. The heated feed liquid enters the feed tank from the overflow pipe, and then It is transferred from the feed port in the feed tank to the inside of the reactor, and the feed liquid fully contacts with the film-coated carrier, planktonic anaerobic microorganisms and activated sludge in the reactor, and then is pushed into the water pressure room, and the supernatant is The overflow pipe is discharged, and the sludge is taken away by the suction truck.

In the plug-flow anaerobic bioreactor, a reflux system is installed in the water pressure room to intermittently return the fermented feed liquid rich in anaerobic microorganisms to the feed tank.

In the plug-flow anaerobic bioreactor, a greenhouse is built around the reactor or a heating pipeline is connected inside the reactor to forcibly increase the temperature of the feed liquid, which helps to promote the activity of anaerobic bacteria and significantly improves the anaerobic biological reactor. Oxygen reaction acidification, hydrolysis and methane production process shorten the retention period of feed liquid and improve the processing capacity and effect of the system.

The film-covered carrier is a frame made of steel pipes, steel bars or UPVC hard tube rigid materials, and a unit module group constructed by using porous and corrosion-resistant double-sided non-woven fabrics, non-woven cotton or similar materials as attachments, and fixed with the frame.

Working principle of the present invention:

After the system is started, the pretreated material liquid is transported to the heating tank by the lift pump. There is a light-transmitting cover made of sunlight board or glass or other high-transparency materials on the top of the heating tank. The light-transmitting cover and the heating The tanks are sealed to prevent the pungent smell from the warming tank. The feed liquid stays in the warming tank for a period of time. The heat collected in the solar greenhouse and the sunlight directly entering the greenhouse will pass through the transparent cover plate for The feed liquid in the warming tank is heated, and the heated feed liquid will flow into the feed tank through the overflow pipe, and flow into the reactor through the feed pipe, and the sludge accumulated in the warming tank for a long time can be drained The mud pipe is discharged, and the feed liquid entering the reactor is fully contacted with the anaerobic microorganisms on the film-coated carrier, in the bottom sludge and in the feed liquid in a push flow manner to carry out anaerobic fermentation. During the generation of microorganisms, the feed liquid The organic matter in the reactor is decomposed and transformed to achieve the purpose of removing CODcr and suspended matter, and changing the form of organic nitrogen and organic phosphorus; the reacted feed liquid is pushed to the hydraulic room by the new feed liquid, and then discharged from the water outlet.

In addition, a reflux system is installed in the water pressure room to intermittently return the fermented feed liquid rich in anaerobic microorganisms to the feed tank, so as to promote full contact between anaerobic microorganisms and new raw materials, and improve the degradation conversion efficiency of the reactor; It is also possible to selectively connect heating pipes inside the reactor as needed to force the feed liquid to increase in temperature, which will help to promote the activity of anaerobic bacteria and significantly improve the acidification, hydrolysis and methanogenic processes of anaerobic reactions. Shorten the retention period of the feed liquid and improve the processing capacity and processing effect of the system.

Advantage and positive effect of the present invention:

①The warming tank will help to greatly improve the energy utilization rate of the feed liquid;

② The feed liquid can effectively use solar energy or other warming measures to heat and increase the temperature, which is helpful to promote the activity of anaerobic bacteria, significantly improve the acidification, hydrolysis and methane production process of anaerobic reaction, shorten the retention period of the feed liquid, and improve the efficiency of the system. processing capacity and processing effect.

③The introduction of film-covered carriers and mud walls in the reactor increases the number of anaerobic microorganisms in the reactor and promotes the conversion efficiency of organic matter in the feed liquid.

④ A reflux system is installed in the water pressure room to intermittently return the fermented feed liquid supernatant to the feed tank to promote full contact between anaerobic microorganisms and fresh feed liquid and improve the degradation conversion efficiency of the reactor.

⑤ If a solar greenhouse is built around the reactor, the solar energy is fully utilized and the energy supply of the system is saved.

【Description of drawings】

Figure 1 Top view of anaerobic bioreactor

Figure 2 A-A sectional view of anaerobic bioreactor

Figure 3 B-B Sectional View of Anaerobic Bioreactor

Figure 4 C-C Sectional Diagram of Anaerobic Bioreactor

Figure 5 D-D Sectional Diagram of Anaerobic Bioreactor

Among them: 1. Feeding pipe, 2. Warming tank, 3. Skylight, 4. Feed tank, 5. Overflow pipe, 6. Feed pipe, 7. Return pipe, 8. Mud discharge pipe, 9. Film-covered carrier, 10. mud retaining wall, 11. heating pipeline, 12. solar greenhouse.

【Detailed ways】

As shown in Figures 1 to 5, the structural points of the anaerobic bioreactor in this embodiment include a warming tank, a skylight, an overflow pipe, a feed tank, a feed pipe, a return pipe, a sludge discharge pipe, and a film-coated carrier , mud wall, heating pipeline, solar greenhouse, gas storage room, light-transmitting cover, reaction area, water pressure room and water outlet, etc. The film-covered carrier is a frame made of steel pipes, steel bars or UPVC hard tube rigid materials, and a unit module group constructed by using porous and corrosion-resistant double-sided non-woven fabrics, non-woven cotton or similar materials as attachments, and fixed with the frame.

After being collected by the sewage collection system, the aquaculture wastewater from pig farms or breeding areas is pretreated and transported by the lift pump to the heating tank 2 through the feeding pipe 1. After being heated in the heating tank, it flows into the feeding material from the overflow pipe 5. tank 4, and then flow into the reactor through the feed pipe 6 at the bottom of the feed tank, and the feed liquid passes through the film-coated carrier 9 in a push-flow manner inside the reactor, and the film-coated carrier, the mud retaining wall 10 and the water in the water body After the anaerobic microorganisms are fully contacted and transformed, they enter the water pressure room through the channel, and then rise to the water outlet to be discharged. Through the return pipe 7, a part of the fermented feed liquid in the hydraulic room can be regularly and quantitatively returned to the feed tank, and mixed with the fresh feed liquid flowing out of the overflow pipe, so as to promote the contact opportunity between the fresh feed liquid and anaerobic microorganisms, and also increase It ensures the circulating fluidity of the feed liquid in the pool and plays a certain role in mixing and stirring. During the flow of the feed liquid in the tank, part of the activated sludge that settles down is intercepted by the mud retaining wall 10 to preserve active microorganisms and promote the decomposition and conversion of organic matter in the feed liquid.

Claims (4)

1. A push-flow type anaerobic bioreactor, characterized in that, the feed liquid after the pretreatment is delivered to the warming tank for heating, and the feed liquid after the warming enters the feed tank by the overflow pipe, and then The feed port in the feed tank is transferred to the inside of the reactor, and the feed liquid fully contacts with the film-coated carrier, planktonic anaerobic microorganisms and activated sludge in the reactor, and then is pushed into the water pressure room, and the supernatant is discharged from the overflow The flow pipe is discharged, and the sludge is taken away by the suction truck. 2. The plug-flow anaerobic bioreactor according to claim 1, characterized in that a reflux system is set in the hydraulic room to intermittently return the fermented feed liquid rich in anaerobic microorganisms to the feed tank. 3. The plug-flow anaerobic bioreactor according to claim 1, characterized in that a greenhouse is built around the reactor or a heating pipeline is connected inside the reactor to forcibly increase the temperature of the feed liquid. 4. The plug-flow anaerobic bioreactor according to claim 1, characterized in that, the film-covered carrier is a frame made of steel pipe, steel bar or UPVC hard pipe rigid material, and a porous and corrosion-resistant double-sided non-woven fabric or non-woven fabric is used. The spun cotton is used as an attachment, and the frame is fixed together to form a unit module group.

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