Livestock and poultry breeding wastewater storage method based on farmland utilization

Abstract

The invention provides a livestock and poultry breeding wastewater storage method based on farmland utilization. The livestock and poultry breeding wastewater storage method comprises the following steps that 1, collecting and then converging wastewater into a wastewater collection tank; 2, pumping the wastewater in the wastewater collection tank into an acid adjusting tank, adjusting the pH value to 5.0-6.0, adding a methane inhibitor, uniformly mixing, and pumping into a wastewater storage tank for storage; 3, performing hydrolytic acidification on the high-water-content biomass waste to generate solid residues and hydrolytic acidification liquid, and making the solid residues into biochar; 4, when the pH value of the wastewater in the wastewater storage tank is higher than 6.5, adding hydrolytic acidification liquid and biochar into the tank, uniformly mixing, and continuously storing; and 5, diluting the wastewater stored in the step 4, and then returning the diluted wastewater to the field for application. The method has a good nitrogen conservation effect, can treat solid and liquid wastes at the same time, is environment-friendly, improves the fertilizer value of the stored wastewater, and meets the requirements of low carbon, environmental protection and resource recycling.

Description

technical field [0001] The invention relates to the technical field of ecological environment protection and resource recycling, in particular to a storage method for livestock and poultry breeding wastewater based on farmland utilization. Background technique [0002] While livestock and poultry farming provides residents with meat, egg and milk products, it also produces a large amount of livestock and poultry manure. It is estimated that China produces 3.8 billion tons of livestock and poultry manure every year, of which about 2 billion tons of waste water are produced annually. Compared with feces, wastewater is large, scattered, and difficult to treat, and is more likely to cause non-point source pollution. Aquaculture wastewater has become one of the important sources of agricultural non-point source pollution. "Technical Specifications for Pollution Control Engineering of Livestock and Poultry Breeding Industry" (HJ497~2009) pointed out that livestock and poultry bre...

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Problems solved by technology

Ding Jingtao et al. (2020) found that after direct storage of pig farm wastewater for 6 months, the loss rate of ammonium nitrogen reached over 68%. Adding an acidifying agent can reduce the total nitrogen loss by 6.3% to 11.1%. Patent (CN201910239399.1) uses oxidants and nano-scale filters to oxidize and filter livestock and poultry breeding manure to reduce the concentration of pollutants in manure; patent ( CN201911221502.6) discloses a method for acidifying dairy cow manure sewage with melon and vegetable stalks. By adding the hydrolyzed acidification liquid of the melon and vegetable stalk press filter liquid to the dairy farm wastewater, the pH value of the dairy cow wastewater is adjusted to 5.0-6.5, and then the dairy cow wastewater is treated. In storage, the ammonia volatilization is reduced by more than 95%, and the nitrogen content is increased by more than 40%. After being directly applied to the field, the fertilizer efficiency is increased by more than 60% compared with the unacidified dairy cow manure sewage. Although this patent has a good effect on reducing the storage of dairy wastewater The effect of nitrogen loss in the process, but melon and vegetable stalks are affected by regions and seasons, and dairy cow wastewater is produced every day, so this technology has great limitations

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