Method for purifying heavy metal elements namely copper and zinc in pig manure by utilizing forage cultivation

Abstract

The invention provides a method for purifying heavy metal elements namely copper and zinc in pig manure by utilizing forage cultivation. According to the invention, two forage varieties namely pennisetum purpureum Schumab cv. Purple and lolium multiflorum are selected for rotation intercropping; according to the idea that the application amount of a fertilizer is determined by the yield of forage,the target yield of the pennisetum purpureum Schumab cv. Purple is determined to be 15000 kg / 667<m2>, and the target yield of the lolium multiflorum is 5000 kg / 667<m2>, so the application amount of the pig manure is determined to be 1500 kg / 667<m2> according to the total annual yield of the forage. The method provided by the invention has the following advantages: firstly, the heavy metal elements namely copper and zinc applied into the soil can be completely removed through the forage in low-content, small-amount and repeated manners, so the purpose of harmless purification is achieved; ecological circulation is realized; and significant ecological benefits are achieved; and secondly, the yield of fresh forage can reach 20000 kg or more per mu, and economic benefit per mu reaches 4700 yuan or more in terms that the fresh forage is calculated to be 0.25 yuan per kilogram; meanwhile, treatment cost of breeding manure wastes is reduced; thus, significant economic benefits are achieved.

Description

technical field [0001] The invention relates to a method for purifying copper and zinc heavy metal elements in pig manure by using forage grass cultivation. Background technique [0002] A large amount of pig manure produced by large-scale pig breeding, some of which are directly added to the pig feed, such as copper, zinc, etc., most of which will be excreted with the pig manure, if the pig manure is improperly treated or used as organic fertilizer, heavy metals After enrichment, it will often cause harm to the environment and bring great pressure to the ecological environment pollution. The methods of processing pig manure in foreign countries mainly include the production of compound fertilizer, physical drying, composting, etc. The domestic pig manure treatment methods mainly include use as organic fertilizer, fermentation to produce biogas, and direct return to the field (limited to free-range farmers). [0003] A large amount of pig manure produced by large-scale pig ...

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Problems solved by technology

[0003] A large amount of pig manure produced by large-scale pig farms is often used for the production of compound fertilizers, physical drying, etc., often with high processing costs. Composting and fermentation are used as organic fertilizers for general crops. Due to the serious excess of copper and zinc in pig manure, general crops are purified and decontaminated. The receiving capacity is limited, which increases the risk of environmental pollution caused by livestock and poultry manure used as organic fertilizer

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