1. Treatment of oily wastewater
Oily wastewater mainly refers to a large amount of produced water produced by the exploitation of crude oil in oil fields, oily wastewater discharged by refineries and petrochemical plants, and oily wastewater produced by the cleaning of oil tankers and vehicles. The treatment of oily wastewater mainly adopts the methods of oil isolation sedimentation, air flotation and biochemistry. The combination of PAC and modified cationic polyacrylamide can treat oily wastewater with coagulation and precipitation filtration, and it has a very good treatment effect. The relative molecular weight of modified cationic polyacrylamide can not be too high, and it is easy to compound with PAC to achieve the ideal effect.
2. Treatment of papermaking wastewater
The paper industry wastewater discharge is large, its middle section water accounts for a large proportion, and many paper enterprises after pretreatment (anaerobic, strong acid treatment, cellulose separation, neutralization, etc.) is also mixed with the middle section water treatment.
3. Application of washing wastewater treatment
Washing wastewater contains a lot of surfactants. Surfactants interact with oil and dust particles to form negatively charged colloidal particles, which can exist stably in water bodies. The addition of PAC in the washing wastewater will produce a large number of positively charged cations and hydroxyl groups to form a multi-core highly charged complex ions, which have a strong ability to adsorb the charge on the surface of the Chemicalbook suspended colloidal particles and compress the double electric layer, resulting in the destabilization of colloidal particles, and finally the formation of high polymeric hydroxide adsorbed and precipitated pollutants Get out of the water.
4. Application of printing and dyeing wastewater treatment
Printing and dyeing wastewater has high COD, chroma and pH value, and coagulation with medicine is a common method to treat it. Although PAC has good coagulation effect and low dosage required, its ability to neutralize printing and dyeing wastewater with high alkalinity is poor, and its application is limited to some extent. H+ produced by hydrolysis of traditional coagulant Al2(SO4)3 can neutralize alkali in printing and dyeing wastewater, and has strong neutralization ability to alkalinity. The study proved that the use of these two coagulants can reduce the treatment cost and improve the treatment effect of printing and dyeing wastewater by taking advantage of their complementary advantages and synergistic effect of the same ion effect.
5. Application of mechanical processing wastewater treatment
The emulsion is widely used in the machining process as a cooling, lubrication, cleaning and rust prevention agent to improve the quality of the product. In the process of use, the emulsion is subjected to the effects of bacteria, microorganisms, high temperature, and selective adsorption of metal debris, which gradually changes from milky white to gray black, and deteriorates and stinks.
