Comprehensive processing process of culturing farm cow dung waste water

Abstract

The invention relates to a comprehensive processing technique of culturing farm cow dung waste water, and relates to the technical field of culturing farm waste processing. The processing process comprises the following steps: (1) liquid and solid parts of fresh cow dung water are separated primarily by a grating; (2) suspended impurities in the cow dung waste water are removed by further centrifuge and air-float; (3) organic pollutant and major part of nitrogen and phosphor compound are removed by using anaerobes and aerobes after the suspended impurities are removed; (4) biogas produced during the anaerobic treatment is purified to generate electricity, and residual heat from electricity generation is recycled; (5) microbe sludge produced during aerobic treatment is dehydrated and is decomposed; (6) the water, from which the organic compounds and the nitrogen and phosphor compounds are removed, is disinfected and then supplied to the breeding farm to flush cowhouse and irrigate the nearby farm land. The electricity generated in the comprehensive processing process can meet the requirement of a breeding farm; high quality organic fertilizer is produced; the comprehensive processing process needs small areas for processing cow dung; the utilization of waste as resource and harmlessness and zero emission are realized during the processing process.

Description

technical field [0001] The invention relates to the technical field of farm waste treatment, in particular to a method for centralized treatment of livestock excrement and urine to meet the standard discharge and comprehensive utilization. Background technique [0002] The rapid development of China's dairy industry has prompted major dairy companies to establish their own dairy farms. The number of cows raised in these pastures varies from a few hundred to as many as more than 10,000. This large-scale pasture produces a large amount of cow dung and urine every day. According to statistics, a dairy cow urinates 20-25Kg and defecates 30-40Kg a day on average. As a kind of animal organic fertilizer, cow dung itself is a kind of precious resource, which can be applied to farmland and pasture. According to statistics, the cow dung produced by a cow can meet the fertilizer demand of 5-8 acres of farmland. Therefore, in foreign countries, the corresponding cows are bred accordin...

AI Technical Summary

Problems solved by technology

According to statistics, the cow dung produced by a cow can meet the fertilizer demand of 5-8 acres of farmland. Therefore, in foreign countries, the corresponding cows are bred according to the area of ​​farmland or pasture. However, due to various conditions in China, many pastures are not nearby. There is not enough farmland or pasture to absorb the dung produced by cows

Therefore, the excess cow dung must be further purified, which will cause serious pollution to the surrounding environment.

[0003] At present, the domestic cow dung treatment methods mainly include composting and biogas preparation. Composting can make the solid part of cow dung into organic fertilizer for takeaway, and preparing biogas can generate clean energy, but neither of these two methods can solve the problem of cow dung. The liquid part, cow manure wastewater contains a large amount of organic matter and nitrogen and phosphorus compounds. These high-concentration compounds will cause damage to the ecological environment when discharged directly. Therefore, the wastewater must be further treated

[0004] At present, domestic cow dung wastewater treatment mostly adopts the process of facultative pond + aerobic pond + wetland. The treatment effect of this method is acceptable, but because it mainly depends on the biodegradation in the natural environment, its degradation load is very low, and the degradation load is very low. The time is also very long, which leads to a large area required, and most dairy farms do not have the conditions to build these ponds around

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