Treatment combined process for pig farm waste water with high nitrogen content

Abstract

The invention provides a treatment combined process for pig farm waste water with high nitrogen content, which is characterized in that the process adopts a combined process realized by an unpowered inside and outside circulation (IOC) anaerobic reactor, an SBBR sequencing batch type biomembrane reactor and artificial swamp. The process flow of the combined process comprises the following steps: a, removing large-grain pollutants and floaters in sewage by mechanical grids; b, carrying out hydrolysis and acidification; c, using the inside and outside circulation anaerobic reactor for high-efficient anaerobic digestion; d, using SBBR reactor for aerobic / anoxic nitration; and e, carrying out the depth treatment by the artificial swamp, and realizing the high-efficient purification on the sewage through substrate filtering, absorption, precipitation, ion exchange, plant absorption and microbiological degradation. The invention can be applicable for the treatment and the integrated utilization of the waste water in big-and-middle-sized pig farms.

Description

technical field [0001] The invention relates to a pig farm wastewater treatment process, which belongs to the technical field of environmental protection wastewater treatment. Background technique [0002] With the development of my country's animal husbandry and the increasingly fierce industrial competition, the large-scale and intensive development of animal husbandry has become an inevitable trend. Large-scale pig farms have high livestock and poultry breeding technology, unified management, and reduced costs. However, the problem of environmental pollution caused by the discharge of a large number of concentrated feces and sewage is also becoming more and more serious. Very high, containing a lot of organic matter, ammonia nitrogen. Relevant data show that the BOD in pig farm wastewater is as high as 2000-5000mg / L, COD 5000-20000mg / L, NH 4 + -N 400~1500mg / L, TN 600~2000mg / L, TP100~300mg / L, it can be seen that the nitrogen concentration in pig farm wastewater is basical...

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Problems solved by technology

[0006] The purpose of the present invention is to propose a new process for treating high-nitrogen pig farm wastewater to solve the problems in the above-mentioned wastewater treatment method. Aiming at the characteristics of large changes in the quality and quantity of pig farm wastewater, imbalanced nutrient element ratios, and high ammonia nitrogen content, at the same time Considering the problem of deep denitrification and deep removal of organic matter, a combined process of IOC-membrane SBBR-constructed wetland is proposed

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