A method of suppressing biofoam caused by Nocardia in an aeration tank

Abstract

The invention provides a method for suppressing biological foam caused by Nocardia in an aeration tank, belonging to the field of sewage treatment. The present invention adjusts the growth state of the foaming bacteria in the biological foam and sludge mixture by adding polyaluminum chloride at the front end of the aeration tank, and quickly controls the biological foam caused by Nocardia; The air volume can greatly reduce the flotation effect of Nocardia by reducing the flotation medium; finally, by fine-tuning the sludge discharge volume, the ecological environment of microorganisms can be adjusted, so that foaming bacteria can be screened out of the system and continuous foaming can be inhibited. The invention is simple and easy to operate, can effectively inhibit the growth of Nocardia, greatly reduce the abundance of foaming bacteria in the activated sludge, and can inhibit the continuous generation of foamy sludge on the surface of the aeration tank, making the foamy sludge Disappears quickly and produces a persistent depressive effect.

Description

technical field [0001] The invention discloses a method for suppressing biological foam caused by Nocardia in an aeration tank, belonging to the field of sewage treatment. Background technique [0002] Foaming and swelling phenomena in activated sludge process are still the main problems affecting its stable operation. In recent years, a large number of studies have shown that the foaming and swelling of sludge during the aeration process is mainly due to the excessive proliferation of some microorganisms (mostly filamentous bacteria) in the sludge, and its essence is the change of bacteria on related environmental factors. The balance between the colonies is disrupted due to the difference in the response of the activated sludge (Principles of Microbial Ecology for Acclimatization of Activated Sludge. Microbiology Bulletin, 2008, (6): 939-943). Dunkel et al. (Evaluating the influence of wastewater composition on the growth of Microthrix parvicella by GCxGC / qMS and real-tim...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the biological foam caused by Nocardia in the current activated sludge process aeration tank leads to the loss of activated sludge, the turbidity of the effluent, and the existence of a stable foam sludge layer that affects the sensory effect, and provides a A method for inhibiting biological foam caused by Nocardia in an aeration tank, by first adding polyaluminium chloride to adjust the growth state of the foaming bacteria, inhibiting the generation of foaming, and then adjusting the amount of aeration To reduce the floating medium of foam sludge, reduce the flotation of foam sludge, and finally adjust the ecological environment of microorganisms in combination with the concentration of sludge mixture, so as to screen foaming bacteria out of the system and inhibit continuous foaming

Images