Process for nitrosation-anaerobic ammonia oxidation immobilization and aquaculture waste water treatment

Abstract

The invention discloses a nitrosation-anaerobic ammonia oxidation treatment process for aquaculture waste water. The nitrosation-anaerobic ammonia oxidation treatment process comprises a nitrosation stage and an anaerobic ammonia oxidation stage, wherein the nitrosation stage and the anaerobic ammonia oxidation stage adopt immobilized microbial spheres for treatment, and the immobilized microbialspheres are obtained by sludge culture, domestication and immobilization. The nitrosation-anaerobic ammonia oxidation treatment process disclosed by the invention has the beneficial effects that the immobilized microbial spheres are cultured and domesticated by adopting bottom sediment of a culture pond, and microbial immobilization is carried out by proper concentration of sodium alginate, boricacid, polyvinyl alcohol and artificial zeolite, higher strength can be borne, the dispersion is not easy, the mass transferring property is good and the stability is higher; nitrosobacteria and anaerobic ammonium oxidation bacteria are cultured, domesticated and immobilized simultaneously to obtain the immobilized microbial spheres with nitrosation and anaerobic ammonia oxidation capabilities, sothat the treating capability is strong and the treatment cost is reduced; the nitrosation-anaerobic ammonia oxidation treatment process has the advantages of small occupied area, low oxygen demand, lower energy consumption and low cost.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a nitrosation-ANAMMOX immobilization and aquaculture wastewater treatment process. Background technique [0002] With the development of social economy and the continuous improvement of people's material living standards, the livestock and poultry breeding industry has become one of the pillar industries of my country's agricultural development. But at the same time, the environmental problems it brings are becoming increasingly prominent. According to the Bulletin of the First National Survey of Pollution Sources released in 2010, the emissions of COD and ammonia nitrogen from agricultural sources were 13,240,900 tons and 918,100 tons respectively, of which the emissions of COD and ammonia nitrogen from the livestock and poultry industry were 12,682,600 tons respectively and 717,300 tons, accounting for 95.8% and 78.1% of agricultural COD and ammonia nitrogen emissions...

AI Technical Summary

Problems solved by technology

Aquaculture wastewater has low BOD and COD concentrations, and has the disadvantage of insufficient carbon sources. It belongs to low C / N ratio ammonia nitrogen wastewater, and low C / N ratio is the key factor restricting the efficient denitrification of aquaculture wastewater.

[0004] The traditional sewage treatment process uses nitrification and denitrification, and there are some problems in the traditional biological denitrification process: (1) Large area and high infrastructure investment

(2) Due to the slow proliferation of nitrifying bacteria and the difficulty of maintaining a high biological concentration, especially in low-temperature winters, the HRT of the system is longer, requiring a larger aeration tank, which increases investment and operating costs

(3) The whole nitrification-denitrification process requires a lot of oxygen, resulting in high energy consumption

(4) Denitrification has a large demand for organic carbon sources, and sewage with a low C / N ratio requires additional carbon sources, which increases operating costs

(5) Alkalinity needs to be supplemented to increase processing costs

[0007] Although the above scheme can treat sewage with low energy consumption through the nitrosation-anammox process, the immobilization method is complicated, and the strength of the biofilm is not high, so it cannot be used for sewage treatment for a long time

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