Method for treating high-concentration ammonia nitrogen pig breeding biogas slurry

Abstract

A method for treating a high-concentration ammonia nitrogen pig breeding biogas slurry comprises the following steps: (1) performing heat treatment on pig breeding biogas slurry at a temperature of 70-100 DEG C for 10-25 min, cooling and carrying out centrifugation to obtain the high-concentration ammonia nitrogen pig breeding biogas slurry; (2) adding activated permutite into the high-concentration ammonia nitrogen pig breeding biogas slurry obtained in the step (1), adsorbing for 20-30h at the room temperature, and filtrating permutite out to obtain a biogas slurry subjected to permutite adsorption treatment, wherein the adding amount of the permutite is 15-25 g / L; (3) inoculating scendesmus obliquus at the logarithmic growth phase to the biogas slurry subjected to permutite adsorption treatment and obtained in the step (2), enabling the initial OD<680> to be 0.15-0.3, placing the biogas slurry inoculated with the scendesmus obliquus till the temperature is 24-26 DEG C, cultivating for 10-15 days with air and lighting according to the ventilation of 1-2 L / min at a 1000-10000 lx environment, and carrying out solid-liquid separation on the culture, wherein the liquid is the purified biogas liquid, and the solid is an energy microalgae biomass. According to the method, deep purification and resource utilization of the high-concentration ammonia nitrogen pig breeding biogas slurry are realized, so that not only are environmental management benefits obtained, but also the production cost of the energy microalgae is reduced.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment. It relates to a treatment method for swine biogas slurry. Background technique [0002] With the development of the economy and the continuous improvement of people's living standards, my country's animal husbandry, especially the pig industry, has developed rapidly in recent years, and the resulting large amount of pig-raising wastewater has had a serious impact on the environment and human health. If the pig wastewater is not properly treated, the nitrogen, phosphorus and organic matter in it will cause environmental problems such as water eutrophication and groundwater pollution. At present, pig wastewater mainly removes high-concentration organic matter through anaerobic fermentation. Although this digestion process reduces the content of some organic matter and nitrogen and phosphorus, the ammonia nitrogen value of the biogas slurry after anaerobic fermentation is relatively hi...

AI Technical Summary

Problems solved by technology

At present, microalgae biomass energy has the problem of high cost of raw materials, and the cost of cultivation (including the cost of carbon source, nitrogen source, phosphorus source and other trace elements) is the bottleneck. Growth medium) will greatly reduce the production cost of microalgae, and also find a good way for the resource development and utilization of waste water

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