Method and equipment for treating swine wastewater

Abstract

The invention relates to a fast, efficient and sanitary method and equipment for treating swine wastewater. The method comprises the following steps: filtering solid particles out of stoste; feeding filtrate into a Fenton oxidation tank, adjusting the pH value to 2-6 and adding 5-50 mmol / L of Fe<2+> and H2O2 with the mass concentration of 30% (the volume ratio of the H2O2 and the wastewater is 1 / 20-1 / 3.) for a Fenton reaction for 10-24 h; feeding supernate into a deferrization treatment tank, adding an alkalinous metal compound, stirring the mixture for 1-10 min and performing a Fe ion sedimentation reaction for 1-5 h; and feeding supernate into a denitrification treatment tank, adding a medicament containing phosphate radicals and Mg<2+> after dissolution at a molar ratio (being 1:1:(1-1.3) of N to P to Mg, stirring the mixture for 1-10 min and performing a reaction on magnesium ammonium phosphate for 1-5 h. The waste water treated by the method meets the national grade-1 standard of wastewater discharge. Additionally, after filter pressing is carried out on solid precipitates generated in all the steps, the solid precipitates are treated safely as solid wastes, and liquid formed by filter pressing flows back to the stoste. The method and the equipment are suitable for treating urine and wastewater of a pig farm and have the advantages of being short in cycle, high in efficiency, good in effect, sanitary in implementation environment and the like.

Description

technical field [0001] The invention relates to the fields of agriculture, animal husbandry and environmental protection, in particular to a method and equipment for treating pig wastewater by chemical methods. Background technique [0002] With the rapid development of my country's livestock and poultry breeding industry, the traditional decentralized management has gradually been replaced by intensive and large-scale farming methods. The centralized discharge of a large amount of waste water rich in high-concentration organic pollutants such as livestock manure and urine poses a great potential threat to the environmental safety of surrounding waters and soil. Large-scale breeding enterprises urgently need a fast and efficient treatment technology to meet The national limit standard for livestock and poultry breeding wastewater discharge. The survey shows that among the pollution factors of livestock and poultry breeding wastewater, the pollution index of pig wastewater i...

AI Technical Summary

Problems solved by technology

When using biochemical methods to treat pig wastewater, the treatment cycle is long, and the hydraulic retention time usually ranges from 1 week to 20 days; this leads to high wastewater storage in the system, relatively complex equipment in the system, large footprint, and difficulty in automation; at the same time, Large-scale equipment is difficult to seal. During operation, a large amount of malodorous gas diffuses into the surrounding environment, causing serious air pollution in the surrounding area, affecting the health and normal life of residents; and it is difficult to meet the national standard for effluent water quality

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