How to treat chemical wastewater containing surfactants?

Surfactants have good properties of washing, wetting, emulsification and solubilization. Surfactant wastewater sources are very wide, such as household kitchen wastewater, hotel wastewater, laundry wastewater contain anionic surfactant (LAS), washing, chemical, textile and other industries also produce a large number of wastewater containing surfactant. In addition to the surfactant and colloidal pollutants carried by the emulsification, the wastewater also contains auxiliaries, bleach and oil substances. The wastewater is generally alkaline, and some of the surfactant content is as high as 1000mg/L, such as wool washing wastewater, and some are only ten mg/L, such as bath wastewater; C0D values also vary widely, from a few hundred to tens of thousands or even higher. Surfactant wastewater exists widely, and its treatment is of great significance for protecting resources, maintaining ecological balance and promoting economic development.

Conventional treatment method

The main methods are foam separation, adsorption, coagulation and catalytic oxidation. The treatment cost is high, the removal rate is not good, and the system is unstable. Biological method has low cost, the most studied and the most widely used, but most of the surfactants have a strong inhibition on the degradation activity of bacteria, so it is not easy to domesticate and cultivate a stable biochemical system.

Surfactant wastewater treatment technology

[Composite catalytic micro-electrolysis process] is the core technology for the environmental treatment of surfactant wastewater.

After treatment by Haichi microelectrolysis, the COD reduction rate of surfactant wastewater reaches 50%-90%, and the biological toxicity of wastewater is greatly reduced. The effluent from micro-electrolysis was treated with hydrolytic acidification and aerobic treatment to achieve standard discharge. At the same time, you can view more technical documents of China sewage treatment engineering network.

Application engineering

Fine chemical plant wastewater treatment project, water volume 50m3/d, influental COD value of 3500mg/L, poor biodegradability, COD value changes greatly, COD load impact is great, can not be directly biochemical treatment.

Treatment technology

Surfactant wastewater -- - regulating pool - - sea chi micro electrolysis subsystem -- - hydrolysis biological aerobic system -- - -- - sand filter -- - emissions

Water inlet and outlet index and process parameters

Total residence time HRT=40 hours operating cost (direct cost)≤2.5 yuan/ton.