Method for immobilizing nutrients in cow dung water by alum

Abstract

The invention provides a method for immobilizing nutrients in cow dung water with alum, which comprises the following steps: slowly adding the alum into the cow dung water in an adjusting tank, continuously stirring, and adjusting the pH value of the cow dung water to 5.5-6.5; wherein the addition amount of the alum is 1.2-3.5% of the mass fraction of the cow dung water. According to the invention, the alum is used as an additive, ammonia gas emission of the cow dung water can be effectively reduced, the nutrient immobilization effect is stable, the nutrient immobilization process flow of thecow dung water is simplified, ammonia gas emission and nitrogen leaching loss in the cow dung water are reduced, and the method has good ecological and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of resource utilization of agricultural waste, in particular to a method for alum to hold cow dung water nutrients. Background technique [0002] With the rapid development of large-scale farming in my country, the discharge of manure and water from livestock and poultry farming has increased sharply. Pig farms generally clean up livestock and poultry manure by dry manure, which produces relatively little water, but cattle farms especially The amount of manure produced by dairy farms is relatively large. Due to its high solid content and difficult treatment, the manure produced by cattle farms has become one of the important sources of agricultural non-point source pollution, greenhouse gas and ammonia emissions. [0003] At present, the treatment of cow dung water mainly includes anaerobic fermentation storage and returning to the field and direct storage and returning of dung water to the field. Among them,...

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Problems solved by technology

[0003] At present, the treatment of cow dung water mainly includes anaerobic fermentation storage and returning to the field and direct storage and returning of dung water to the field. Among them, anaerobic fermentation takes the advantage of the biogas produced by it as a clean energy source and has become the most vigorously promoted use of dung water in my country. However, in the production of anaerobic fermentation of manure, the maintenance cost of equipment is relatively high, and the biogas produced by small-scale farms does not have the economic value of utilization, resulting in a lot of biogas being directly discharged into the atmosphere, causing environmental pollution; In terms of direct storage and returning of manure to the field, because manure contains a large amount of urea, the urea decomposes to produce a large amount of ammonium ions. Excessive accumulation of ammonium ions in manure will cause the manure to release a large amount of ammonia gas and pollute the environment.

The dung water is alkaline in the presence of a large amount of ammonium ions. Adding acid to the dung water can store ammonium ions in the dung water for a long time, improve the fertilizer efficiency of the dung water, and reduce the volatilization of ammonia gas. A method for acidifying and storing poultry breeding manure (CN109516839A), using sulfuric acid as an acidifying agent to acidify the breeding manure, there is a problem of adding sulfuric acid multiple times, and the cost of using other organic acids represented by oxalic acid and lactic acid is too high

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