Method for treating pig farm wastewater by using straw

Abstract

The present invention discloses a method for treating pig farm wastewater by using straw, including the steps of A, building a straw matrix pool to degrade wastewater COD and absorb nitrogen and phosphorus through straw; B, adding straw in the straw matrix pool after the pool is built and immersing the straw in wastewater; C, treating breeding wastewater, including gradually adding pig farm wastewater after anaerobic methane fermentation, allowing the wastewater to flow down step by step, keeping the wastewater in the straw matrix pool for 5-10 days, and discharging the wastewater by a lower end outlet; and D, managing the straw matrix pool, including replenishing straw to the straw matrix pool after the straw matrix pool running for 4-5 months. The method for treating pig farm wastewater by using straw is low in operating costs, simple in operation, and easy to be accepted by farming households, has an excellent treatment effect on nitrogen, phosphorus and COD in farm waste, and has a good application prospect in the majority of sub-tropical areas in middle and lower reaches of the Yangtze River.

Description

Technical field [0001] The present invention relates to the field of agricultural environment, and more specifically to a method for treating waste pollutants in pig farms, and is particularly suitable for treating waste pollutants from pig farms in the subtropical region south of the Yangtze River in China, and reduces chemical oxygen demand (COD) of wastewater. And the content of nitrogen and phosphorus is 40-60%. Background technique [0002] In recent years, with the rapid development of large-scale aquaculture, the problem of eutrophication in rivers and lakes caused by waste discharge has become increasingly prominent, and the aquaculture industry has become the main source of nitrogen and phosphorus in my country's agricultural non-point source pollution. The treatment of aquaculture waste is currently mainly based on the use of biogas digester anaerobic fermentation as the main form of energy reuse, while the use of biogas slurry is mainly in the form of fertilizer irriga...

AI Technical Summary

Problems solved by technology

This technology has a good effect on the wastewater treatment of small-scale farmers, but with the expansion of the breeding scale, the amount of wastewater discharge increases, coupled with the limitation of the available land area of ​​the farm, the biogas slurry will be released to the farm under the condition of not being fully utilized. The discharge of water bodies such as surrounding rivers and lakes will cause an increase in the NP content of the water body (eutrophication), thus posing a serious threat to the surrounding water body environment. At present, some large pig farms mainly use oxidation ponds or septic tanks to treat waste. Although it has a certain effect in reducing COD, it cannot effectively reduce the content of nitrogen and phosphorus in wastewater

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