Method for inhibiting expansion of anaerobic active sludge

Abstract

The invention discloses a method for inhibiting expansion of anaerobic active sludge, comprising the following steps of: firstly adding an inorganic salting liquid containing 5-10% of ferrous sulphate, 10-20% of cupric nitrate, 5-20% of cobalt nitrate and the like into wastewater, stirring, adding active substances such as 5-20% of kaolin, 10-20% of calcium carbonate and the like into water after 20-40 min, adjusting pH value of water to 6.5-8.5, and carrying out oxygen-enriched aeration at normal temperature for 2-4 hours. According to the invention, with the addition of the inorganic heavy metallic salts and active substances, the growth of anaerobic bacteria is inhibited and consolidation performance of sludge is raised so as to improve sludge settleability; and in addition, through oxygen-enriched aeration, production of anaerobic bacteria can be further inhibited so as to prevent expansion of anaerobic active sludge.

Description

technical field [0001] The invention relates to a method for inhibiting the expansion of anaerobic activated sludge, which belongs to the field of sludge treatment. Background technique [0002] The bulking of anaerobic activated sludge is mainly caused by the continuous large-scale reproduction of anaerobic bacteria in water. The problem of sludge bulking is a difficult problem that has been accompanied and often occurred since the generation of activated sludge. Its main characteristics are: sludge The structure is loose, the quality becomes lighter, the sedimentation compressibility is poor, the SV value increases, sometimes reaching 90%, and the SVI reaches more than 300, a large amount of sludge is lost, the effluent is turbid, the secondary sedimentation is difficult to separate solid and liquid, and the return sludge concentration is low, sometimes Also accompanied by the generation of a large amount of foam, it is impossible to maintain the normal work of biochemical...

AI Technical Summary

Problems solved by technology

In addition, it is also possible to destroy the growth of bacteria by adding hydrogen peroxide and ozone. This method can generally reduce the SVI value quickly, but it does not fundamentally control the growth and reproduction of bacteria. Once the dosing is stopped , the phenomenon of sludge bulking will come back

Therefore, none of the above methods can fundamentally inhibit the growth of bacteria.