Recycling treatment method for feces and wastewater in large-scale livestock and poultry breeding farm

Abstract

A recycling treatment method for feces and wastewater in a large-scale livestock and poultry breeding farm includes the following steps: (1) pre-treating the feces and wastewater in the large-scale livestock and poultry breeding farm in a pretreatment unit to form slurry; (2) feeding the slurry into an energy recovery unit, and performing solid anaerobic digestion in a solid anaerobic reactor to obtain an energy gas, methane; (3) performing solid-liquid separation to the digested slurry to generate wastewater, which is then fed into a UASB reactor to perform further anaerobic fermentation to remove organic pollutants from the wastewater; (4) feeding the treated wastewater into a nitrogen and phosphorus removal unit to perform nitrogen and phosphorus removal treatment; (5) separating and purifying a precipitate, which is generated in the nitrogen and phosphorus removal unit and mainly includes magnesium ammonium phosphate, to obtain an organic fertilizer additive, wherein the nitrogen removal process is autotrophic nitrogen removal and can reduce aeration quantity by 62.5% without addition of any carbon sources, thus saving large quantity of operation cost; and (6) feeding the treated wastewater into a deep-treatment unit to remove bio-refractory substances and disinfect the wastewater so as to finally reach emission and recovery standards of wastewater.

Description

technical field [0001] The invention relates to the field of waste water treatment, in particular to a resource treatment process for livestock and poultry farm manure and waste water. Background technique [0002] According to statistics, there are more than 14,000 large-scale livestock and poultry farms in my country, and the stock of livestock and poultry breeding is 12.36 billion heads (only). The output value of the livestock and poultry breeding industry exceeds 1.4 trillion yuan, accounting for 34% of the agricultural output value, which is related to the national economy and people's livelihood. important industry. However, in recent years, the problem of pollution prevention and control of livestock and poultry breeding in my country has become increasingly prominent. According to the results of the "First National Survey of Pollution Sources" in 2010, the pollution of livestock and poultry breeding has become the top of agricultural non-point source pollution in my ...

AI Technical Summary

Problems solved by technology

If the farm wastewater is not effectively treated and discharged directly into the external environment, it will cause serious pollution to the environment

[0004] The traditional sewage treatment process of "using energy to dissipate energy and transfer pollution" has aggravated the emission of greenhouse gases, resulting in a large amount of energy waste, and the rising trend of energy prices has also raised the cost of sewage treatment

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