The basic characteristics of fine chemical industry wastewater are extremely high COD, high salinity, and toxicity to microorganisms, making it a typical refractory wastewater. The high content of pollutants in the wastewater is caused by the incomplete reaction of raw materials and the entry of a large amount of solvent media used in raw materials or production into the wastewater system. Its water quality composition is complex, with many by-products. The reaction raw materials are often solvent substances or compounds with cyclic structures. Many organic pollutants in fine chemical industry wastewater are toxic and harmful to microorganisms, such as halogen compounds, nitro compounds, and bactericidal dispersants or surfactants, which increases the difficulty of wastewater treatment.
The demulsifier for fine chemical industry wastewater is an organic polymer that can improve the interfacial tension of oil-in-water, neutralize the negative charges in the oily wastewater, promote the separation and aggregation of emulsified oil from water, and achieve the effects of demulsification and flocculation. The demulsifier can reduce the COD of sewage. Through its adsorption effect, it can effectively reduce pollutants such as chromaticity and total phosphorus. It can be applied to the treatment of high-concentration oily wastewater such as cutting fluids, emulsions, grinding fluids, and release agents.
The operation is simple, and the steps are as follows:
- Add the demulsifier to the fine chemical industry wastewater and stir for 1-2 minutes to achieve rapid demulsification.
- This demulsifier has a synergistic effect. Adding PAC or PFAC and PFC in the early stage can quickly clarify the water quality.
- After adding the demulsifier to achieve demulsification, a small amount of prepared polyacrylamide can be added in the later stage for flocculation and sedimentation.
- The amount of the demulsifier and the pH of the wastewater can be adjusted to achieve the purpose of rapid demulsification and separation. The best effect is achieved when the pH is between 7 and 8.
- According to the actual situation of the user's wastewater, determine whether to add PAC and PAM in the experiment, the addition sequence, and the specific dosage.
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