Defoaming agent for eliminating foam in wastewater aerobic activated sludge tank and preparation method ofdefoaming agent

Abstract

The invention discloses a defoaming agent for eliminating foam in a wastewater aerobic activated sludge tank and a preparation method of the defoaming agent. The defoaming agent comprises the following raw materials in percentage by weight: 40-55% of polyether modified silicone oil; 10-15% by mass of an emulsifier; 10-20% by mass of a carrier; 5-10% by mass of a curing agent; 10-20% by mass of deionized water; 4-5% by mass of a stabilizer; and 5-6% by mass of a dispersant. The prepared defoaming agent can be quickly dispersed and dissolved in water, does not float oil, is high in defoaming speed and lasting in foam inhibition, does not change the oxygen content of the water, avoids secondary pollution of a water body, has good alkali resistance and foam inhibition, can play an excellent defoaming effect with a very small addition amount, and can well inhibit foam regeneration.

Description

technical field [0001] The invention relates to the technical field of defoamers, in particular to a defoamer for eliminating foam in waste water aerobic activated sludge tanks and a preparation method thereof. Background technique [0002] The usual process flow of oil refinery wastewater is: grease trap→separation tank→flotation tank→aerobic activated sludge tank→contact oxidation tank→after floating tank→general discharge. Among them, the aerobic activated sludge tank often produces more foam during operation, and the subsequent contact oxidation tank also has foam problems. The generation of foam seriously affects the treatment effect of wastewater. The biggest advantage of the polyether defoamer used is that It has strong anti-foaming ability, but it has a fatal shortcoming of low foam-breaking rate. Once a large amount of foam is generated, it cannot be effectively extinguished at once, but it needs to add a certain amount of defoamer to have a good defoaming effect. ...

AI Technical Summary

Problems solved by technology

Among them, the aerobic activated sludge tank often produces more foam during operation, and the subsequent contact oxidation tank also has foam problems. The generation of foam seriously affects the treatment effect of wastewater. The biggest advantage of the polyether defoamer used is that It has strong anti-foaming ability, but it has a fatal shortcoming of low foam-breaking rate. Once a large amount of foam is generated, it cannot be effectively extinguished at once, but it needs to add a certain amount of defoamer to have a good defoaming effect. Foam suppression ability

[0003] At present, the existing defoamer for eliminating foam in the wastewater aerobic activated sludge tank also has some deficiencies, for example; the existing defoamer for eliminating the foam in the wastewater aerobic activated sludge tank is dispersed in water The speed is relatively slow, prone to the appearance of floating oil, the defoaming speed is relatively full, the foam suppression is short, it is easy to change the oxygen content of the water quality, and cause secondary pollution of the water body, and the existing aerobic activated sludge tank for eliminating wastewater The foam defoamer has general alkali resistance and poor foam suppression, so it needs to add a large amount of defoamer to exert an excellent defoaming effect