Comprehensive treatment and utilization method of livestock and poultry breeding wastewater

Abstract

The invention discloses a comprehensive treatment and utilization technology of livestock and poultry breeding wastewater. The technology concretely comprises the following steps: solid liquid separation, biological adsorption and condensation, UASB, two-stage A / O, efficient MBR, chemical phosphorus removal and ultraviolet catalytic ozonation. Compared with the prior art, the technology has the following benefits: the technology ensures that treated wastewater can meet the requirements of intensive pig farm pollutant discharge limitation in discharge standard of pollutants for livestock and poultry breeding (GB18596-2001) and water quality standard for farm irrigation) (GB 5084-2005) through the process combination; nutrient substance, such as organic matter, nitrogen and phosphorus, in breeding wastewater is recycled through the effect of biological adsorption and condensation on the basis that the technology reaches a standard, so that composting production is performed, and the problem that resource recovery cannot be performed through the existing single pollution treatment technology is solved; the ozonation efficiency is improved through ultraviolet catalysis, and the problems that the existing ozonation technology cannot be stable and reach a standard and the energy consumption is high are solved; external energy input for the whole technology is greatly reduced throughrecycling of marsh gas for generating power.

Description

technical field [0001] The invention relates to a method for comprehensive treatment and utilization of livestock and poultry breeding wastewater, and belongs to the technical field of resource utilization of sewage. Background technique [0002] The scale of livestock and poultry farming in my country is huge. Taking pigs as an example, the number of pigs slaughtered every year is close to 1.2 billion, and the annual production of fecal pollutants is 3 billion tons. The large-scale breeding of livestock and poultry presents a trend of high pollution load and low emission standards. The environmental pollution caused by livestock and poultry breeding has greatly exceeded the maximum capacity and carrying capacity of the environment, and has become one of the main reasons for the deterioration of my country's ecological environment. On December 21, 2016, at the 14th meeting of the Central Finance and Economics Leading Group, it was proposed that "speeding up the treatment and...

AI Technical Summary

Problems solved by technology

Disadvantages are: ① Sufficient agricultural land is required, which is not available in many farms; ② The seasonality of crop fertilizers is in conflict with the continuity of manure discharge, requiring a large amount of storage space; ③ The biogas slurry needs to be clarified, otherwise the pipe network will be easily blocked Furrow application or a large amount of flood irrigation can easily cause soil compaction; ④ low sanitation level, there is still a greater risk of environmental pollution

[0005] Problems in the environment-friendly type dominated by standard discharge: ① Most of the treatment effects are not good, the wastewater treatment facilities cannot operate normally, and a large amount of waste liquid is directly discharged without effective treatment, seriously polluting the ecological environment; ② A few normal projects also have treatment costs It is relatively high, with poor operation stability, and it is difficult to fully meet the discharge standards; ③Take water treatment as the main guide, ignore the treatment and disposal of feces, and easily cause direct discharge of feces

Images