Integrated treatment method for livestock and poultry breeding wastewater

Abstract

The invention provides an integrated treatment method for livestock and poultry breeding wastewater. The integrated treatment method comprises that livestock and poultry breeding wastewater is subjected to solid-liquid separation to obtain waste residue and wastewater, the waste residue is directly recycled, the wastewater is homogenized, the homogenized wastewater is divided into two parts, one part directly enters an anaerobic pool, the another part enters an upflow type anaerobic sludge bed reactor and is treated, the generated biogas is stored so as to be spare, and the wastewater enters the anaerobic pool; and after the wastewater sequentially flows through the anaerobic pool, an anoxic pool and an aerobic pool and reacts, one part of the wastewater flows out from the outlet of the aerobic pool, enters a vertical flow type precipitation device, and is precipitated, the other part of the wastewater flows through a reflux gallery and refluxes to the anoxic pool and the anaerobic pool, the wastewater treated by the vertical flow type precipitation device enters a clear water pool and is disinfected, and the sludge in the vertical flow type precipitation device is discharged intoa sludge storage pool. According to the present invention, with the treatment method, the operating cost, the number of the structures, and the occupation area of the breeding farm can be reduced, theconstruction investment can be reduced, and the existing process flow can be reduced.

Description

technical field [0001] The invention belongs to the field of water pollution control of environmental engineering, and in particular relates to an integrated treatment method for livestock and poultry breeding wastewater. Background technique [0002] The livestock and poultry industry is an important part of agriculture and the rural economy, and the environmental pollution caused by the livestock and poultry breeding industry is very serious. The livestock and poultry breeding wastewater discharged by large-scale farms every day is large and concentrated. The wastewater contains a large number of pollutants, such as COD, ammonia nitrogen, heavy metals, residual veterinary drugs, and a large number of pathogens. The wastewater from livestock and poultry farming must be treated before it can emission. [0003] From the perspective of wastewater treatment technology, to achieve the effect of removing nitrogen and phosphorus while removing COD and BOD, anaerobic technology is...

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Problems solved by technology

[0006] Chinese invention patent CN103288303A discloses a method for resource utilization and recycling of livestock and poultry breeding wastewater, including anaerobic digestion to produce biogas, slag removal, ammonia nitrogen removal, biochemical aerated biological filter, disinfection and organic fertilizer manufacturing. The invention is based on anaerobic technology, denitrification technology, aerated biological biochemical technology and disinfection technology, and uses livestock and poultry breeding wastewater as a resource to process it through anaerobic fermentation to produce biogas, and the wastewater after biogas production is separated from solid and liquid , the solid slag is used as a raw material for the production of organic fertilizers, and the production of organic fertilizers has a good treatment effect. However, this invention requires the use of nano-catalytic inert electrodes, and at the same time, there are more equipment and the cost is higher.

Chinese invention patent CN104326561A discloses a method for multi-stage microbial enhancement to improve the treatment efficiency of livestock and poultry breeding wastewater. In this invention, different types of water purification microbial preparations are added to different treatment units of livestock and poultry breeding wastewater treatment facilities to enhance the sewage treatment effect , so as to improve the sewage treatment efficiency of each treatment unit, and finally improve the treatment efficiency of sewage treatment facilities as a whole, and further reduce the effluent index after treatment. The method provided by this invention can reduce COD and The removal rate of BOD can be increased by 10-40%, the removal rate of ammonia nitrogen and total nitrogen can be increased by 20-50%, and the efficiency of sewage treatment is significantly improved. The activity is affected by many factors, so the application of this method is limited

[0007] In order to make the effluent of livestock and poultry wastewater meet the requirements of GB18596-2001 "Pollutant Discharge Standards for Livestock and Poultry Breeding Industry", the commonly used process is pretreatment + hydrolysis acidification tank + anaerobic reaction tank + aerobic treatment system + natural treatment system, currently Most of the technologies used are pretreatment + UASB anaerobic reactor + AO reaction pool + natural treatment. The disadvantages of the existing technology are long process flow, many structures, large initial investment, and large floor area. Traditional nitrification and reaction Nitrification, high oxygen consumption, need to add carbon source, high energy consumption and high operating cost

Therefore, there is still a lack of a treatment method for livestock and poultry breeding wastewater that has high governance efficiency, simple operation steps, and is easy to popularize and apply.

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