Immobilized nitrobacteria enrichment culture method and device in sewage treatment process

Abstract

The invention discloses an immobilized nitrobacteria enrichment culture method and device in a sewage treatment process. A sequencing-batch biomembrane activated sludge process is utilized to perform enrichment culture on nitrobacteria: dewatered sludge is inoculated in an immobilized nitrobacteria culture device, and an enrichment culture solution is added; and in the nitrobacteria enrichment culture process, the biomembrane ammonia nitrogen load is gradually enhanced, and the pH value is controlled. The enrichment culture solution is formed by mixing NH4HCO3 and pretreated municipal sewage, the ammonia nitrogen concentrations are respectively 100, 300, 500, 700 and 1000 mg/L, and the COD (chemical oxygen demand) concentration is 30-60 mg/L. By controlling the immobilized nitrobacteria culture device, the DO in the reaction mixture is 2-6 mg/L, the pH value is 6.5-8.0, the biofilm-formation acclimatization culture temperature is 10-14 DEG C, and the enrichment purification culture temperature is 15-25 DEG C. The device can be used for culturing nitrobacteria at low temperature, and the nitrobacteria content is up to 40-45%. The immobilized nitrobacteria have high low-temperature nitration resistance, and can treat the wastewater of which the ammonia nitrogen concentration is up to 1000 mg/L, so that the ammonia nitrogen in the wastewater is lowered to 1.0 mg/L or below.

Description

technical field [0001] The invention relates to a method for enriching and cultivating immobilized nitrifying bacteria in a sewage treatment process, and a cultivating device used in the cultivating method. The cultured immobilized nitrifying bacteria can not only be directly used to treat industrial wastewater with high ammonia nitrogen concentration, but also can be used for the upgrading of traditional activated sludge sewage treatment plants, which belongs to the field of sewage treatment. Background technique [0002] With the rapid development of my country's economy, a large amount of domestic sewage and industrial wastewater are directly discharged into various water bodies. Although the environmental supervision mechanism is becoming more and more perfect, the problem of water pollution in my country is still not optimistic, which affects the sustainable development of the economy to a certain extent. [0003] Biological denitrification of sewage is currently the mo...

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Problems solved by technology

CN103319000A discloses a preparation method of a low-temperature-resistant autotrophic nitrifying bacteria agent, using low-temperature activated sludge as raw material, the medium is composed of sodium acetate, ammonium chloride, calcium chloride, and buffer, cultivated at 10°C, rich in The collected nitrifying bacteria agent is not fixed on the carrier, and the type and content of the cultured nitrifying bacteria are not mentioned

CN102559489A discloses a method for rapidly enriching ammonia oxidizing bacteria, using domestic sewage activated sludge as raw material,

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