A method for reducing the activity of heavy metal ions in livestock and poultry manure by adding ethionyl nitrogen

Abstract

The invention belongs to the field of preparation of organic fertilizers, and concretely relates to a method for reducing the activity of heavy metal ions in excrements of livestock by adding sodium diethyldithiocarbamate trihydrate. The method comprises: under the condition of continuous turning over or stirring, sprinkling an aqueous solution sodium diethyldithiocarbamate trihydrate into excrements of livestock, controlling the pH value to be 6-7, and then standing for 2-3 h, so as to enable state-exchangeable heavy metal ions to have a complexation reaction with sodium diethyldithiocarbamate trihydrate and to be passivated, so as to reduce the biological activity of the heavy metal ions. sodium diethyldithiocarbamate trihydrate employed by the method has extremely strong passivation capability on state-exchangeable heavy metal ions in excrements of livestock, and a relatively high heavy-metal passivation rate can be obtained and the passivation effect is relatively good when the usage amount of the pasivation agent is less, and sodium diethyldithiocarbamate trihydrate is applicable to moderate and mild heavy-metal-polluted excrements, also is usable as a technology for restoring heavy-metal-polluted soil, and has substantial effect on composite pollution caused by multiple heavy-metal elements.

Description

technical field [0001] The invention belongs to the field of organic fertilizer preparation, and in particular relates to a method for reducing the activity of heavy metal ions in livestock and poultry manure by adding ethylsulfur nitrogen. Background technique [0002] In recent years, animal husbandry has gradually developed towards large-scale and modernization, and the number of livestock and poultry has increased significantly. However, while animal husbandry provides us with sufficient food such as meat and eggs, it also produces some environmental problems, such as producing a lot of stench and polluting the air. At the same time, livestock and poultry manure is an excellent organic fertilizer, containing a lot of phosphorus and nitrogen, and is an important fertilizer resource in my country's agricultural production. Therefore, it is an important way to solve the problem of livestock and poultry manure pollution by proposing efficient and harmless livestock and poul...

AI Technical Summary

Problems solved by technology

[0004] At present, there have been many studies on heavy metal pollution in livestock and poultry manure. There are two main solutions: one is to change the form of heavy metals, make them fixed and stable, and reduce their mobility and bioavailability in the environment. The second is to remove heavy metals from livestock and poultry manure, use special plants to absorb them and then remove the plants, or use engineering technology to change the heavy metals in livestock and poultry manure into soluble and free states, and then collect them after washing Heavy metals in the eluate, so as to achieve the dual purpose of recovering heavy metals and reducing heavy metals in livestock and poultry manure, using the plant absorption method for treatment, the economic cost is low, but the cycle is long, time-consuming and labor-intensive, and the effect is slow. The absorption and utilization of heavy metals is limited, and the treatment of plants in the later stage is more difficult; the scheme of recycling heavy metals by using engineering technology can achieve the dual purposes of recycling heavy metals and reducing heavy metals in livestock and poultry manure, increasing the economic income of the factory, but the heavy metal recovery process is complicated and cumbersome. higher cost

The research and application of the first scheme is more extensive. The traditional method of solidifying and stabilizing heavy metal ions is to use sulfide such as sodium sulfide as a passivating agent to passivate heavy metals, so as to achieve the purpose of removing heavy metals. The passivation effect of sodium sulfide is good, and the passivation rate High, but the amount of industrial application is large, the price is expensive, the economic cost is high, and the residual sodium ions will cause secondary pollution to the soil

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