A treatment process for degreasing wastewater

Abstract

The invention provides a treatment process for degreasing wastewater which comprises the following steps: S1, pre-filtering degreasing wastewater to remove part of solids and oil in the degreasing wastewater to obtain pre-filtered water; S2, adjusting the pH value of the pre-filtered water to 8.5-9; S3, carrying out three-phase separation on the adjusted pre-filtered water to remove solids and oil in the pre-filtered water, so as to obtain three-phase separated water; S4, collecting the three-phase separated water and controlling the three-phase separated water to be within a preset liquid level range; S5, carrying out low-temperature vacuum evaporation treatment on the three-phase separated water to obtain evaporated water; and S6, carrying out ceramic membrane filtration on the evaporated water to remove light oil and impurities contained in the evaporated water. The quality of the water obtained by the process can reach the reuse standard, the water quantity of production water is reduced, the production cost input of enterprises is reduced, and the process can greatly save the outsourcing treatment cost of the degreasing wastewater.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a degreasing wastewater treatment process. Background technique [0002] Degreasing wastewater is generally divided into chemical (or electrochemical) degreasing wastewater and surfactant degreasing wastewater, which have in common that the content of alkali and inorganic salts is relatively high, and the pH value is also relatively high; the second is that the oil stained by alkali washing is generally mineral oil , so it does not form a soap base, but floats on the liquid surface; the third is that it is basically non-toxic and will not directly cause damage and danger to the ecology and the human body. [0003] At present, most of the treatment processes for degreasing wastewater are traditional processes, such as oil slick, chemical addition, demulsification and coagulation reaction, air flotation, biochemical and so on. Because of the presence of grease, if the...

AI Technical Summary

Problems solved by technology

Because of the presence of grease, if the flocculant (PAC) and PAM are directly used and the sedimentation treatment process is used, a large amount of cotton-like loose flocs will be produced. Although the effect of mud-water separation using air flotation facilities is better, the load is heavy

Moreover, when the concentration of degreasing wastewater is high, it is very difficult to treat, and the consumption of chemicals is large, the operation is difficult, and the operation stability is poor.

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