Backflow defoaming method for sewage pool

Abstract

The invention discloses a backflow defoaming method for a sewage pool. The backflow defoaming method comprises the following steps: S1, adding sewage into the sewage pool through a liquid pump; S2, adding a defoaming agent into a defoaming liquid storage pool through a metering pump, and then adding deionized water for dilution to obtain a defoaming liquid, with the dilution ratio being 2-4:1; S3,spraying the defoaming liquid to the surface of the sewage pool in a mist mode while stirring is conducted, performing defoaming treatment, and discharging, wherein the weight ratio of the defoamingagent to the sewage is 1-3:100. According to the method, objectives of bidirectionally increasing the surface tension of a substance solution and reducing the surface free energy of foams are achievedthrough compounding synergy; chemical performance is improved, the dosage is reduced, and COD of discharged water of the system is not influenced. The defoaming agent has the advantages of strong acid and alkali resistance, strong defoaming and foam inhibition capabilities, long foam inhibition time and capability of avoiding secondary pollution of wastewater due to addition of the defoaming agent.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a reflux defoaming method for a sewage pool. Background technique [0002] In the process of domestic sewage and industrial sewage treatment, because the sewage contains a large number of microorganisms, a large number of foams will be produced. These foams are viscous. If no defoaming treatment is carried out, they will be floated at the outlet with the discharged water to form a foam layer to block The normal material and energy exchange between sunlight and air and water body affects the natural purification ability of water body and seriously affects the normal growth of aquatic organisms in rivers. [0003] The commonly used method of suppressing and removing foam in sewage is mainly to add sewage defoamer, which is an additive that suppresses foam generation or eliminates foam that has already occurred by reducing the surface tension of sewage. At present, the com...

AI Technical Summary

Problems solved by technology

At present, the commonly used sewage defoamers are divided into three categories: mineral oil, polyether, and silicone. Among them, polyether defoamers have the characteristics of high temperature resistance and strong alkali resistance, but their defoaming speed and The antifoaming time is not ideal, and the defoaming effect is poor; although the silicone defoaming agent has the characteristics of rapid defoaming, long antifoaming time, safety and non-toxicity, it is difficult to dissolve in water, and it is resistant to high temperature and strong alkali Poor performance; but the defoamer prepared by the prior art has the defects of short foam suppression time and long defoaming time, and its application range is small