Simulated wastewater and method for rapidly culturing autotrophic thiobacillus denitrificans sludge

Abstract

The invention relates to simulated wastewater for rapidly culturing autotrophic thiobacillus denitrificans sludge. The simulated wastewater comprises, in concentration, 0-200 mg / L of NO3-N3, 300-1500 mg / L of NaHCO3, 60-500 mg / L of S, 10-80 mg / L of MgSO4 7H2O, 48-100 mg / L of FeSO, 460-300 mg / L of Na2HPO and 430-400mg / L of NaH2PO. The thiobacillus denitrificans sludge with good sedimentation performance (the sedimentation rate is 2-3 m / h, the sedimentation rate of the sludge cultured by a common method is 0.5-1.0 m / h), high sludge activity, high total nitrogen (the total nitrogen load is as high as 1.0 kg / m<3> / d) can be quickly cultured, so that the reactor load is effectively increased, and after culturing for 20 days (the sludge culture time is greatly shortened, and the start-up time of the sludge cultured by the common method is as long as 3-4 months, the black thiobacillus denitrificans sludge with an average particle size of about 50 microns and good activity is obtained.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a denitrification thiobacterium sludge, in particular to a simulated wastewater and a method for rapidly cultivating autotrophic denitrification thiobacterium sludge. Background technique [0002] In recent years, water body eutrophication has become a global problem, and total nitrogen exceeding the standard is one of the culprits of water body eutrophication, so it is imminent to solve the problem of total nitrogen. The discharge standard currently implemented by the country is the first-level A standard, which stipulates that the total nitrogen effluent index should be less than 15mg / L, while in some special areas such as Beijing and Jiangsu and Zhejiang, it is stipulated that the total nitrogen effluent should be less than 10mg / L of the special discharge limit. In some areas such as Dianchi Lake, it is even proposed that the total nitrogen can reach the standar...

AI Technical Summary

Problems solved by technology

However, the existing sulfur autotrophic denitrification sludge cultivation methods are all packed beds, that is, a large amount of sulfur flakes are added to the reactor, and the bacteria are attached to the surface of the sulfur flakes to form a layer of biofilm through continuous water inflow culture. It has a series of problems such as long start-up time (3-4 months), large floor area, low denitrification efficiency, and possible SS exceeding the standard in the effluent.

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