When treating sewage, the most common water treatment consumables for purifying sewage are polyaluminium chloride water purifiers. Although polyaluminium chloride has the advantage of a wide water area, what kind of sewage is it better for?
1. Treatment of domestic water after production, that is, the treatment of washing wastewater. Because the water contains a lot of surfactants, if this agent interacts with oil, dust particles, etc., it will form colloidal particles with negative charges, which are easy to remain in the water stably. If an appropriate amount of polyaluminium chloride is added to the wastewater, a lot of positively charged cations and multi-nuclear high-charge cooperative ions formed by radical bridging will be generated, which can make the charges suspended on the surface of the colloidal particles have strong adsorption and electrical neutralization capabilities and double-layer compression capabilities, thereby destabilizing the colloidal particles, and then adsorbing and depositing the pollutants to separate the water body.
2. Papermaking wastewater treatment The papermaking industry discharges a large amount of wastewater, a large proportion of which comes from the treatment of stage water, and many papermaking enterprises' black liquor is also mixed with the middle stage water for treatment after pretreatment (anaerobic, strong acid treatment, cellulose separation, neutralization, etc.). This increases the harmful substances in papermaking wastewater. Use polyaluminium chloride to coagulate and precipitate to treat papermaking middle stage water. With the increase of basicity, the removal rate of COD and SS increases. It should be noted here that after the basicity reaches 75%, the removal rate decreases. At a temperature of 250°C, adding 0.6gL of polyaluminium chloride with a basicity of 75% can make the effluent meet the national emission standards. In addition, polyaluminium chloride has practical significance in the treatment of papermaking wastewater because of its low price and the fact that the sediment can be returned to the papermaking process as raw material, there is no secondary pollution problem, and it can generate certain economic benefits. Research has found that when the amount of coagulant added is greater than 750 mg/L under alkaline conditions (pH 7-9), the removal rate of suspended solids can reach more than 95%, and 20-50% of CODCr can be removed.
3. Treatment of printing and dyeing wastewater We all know that printing and dyeing wastewater has high COD, chromaticity and pH value. Adding drugs to its wastewater for coagulation is a common treatment method. Although polyaluminum chloride has good coagulation effect and the dosage we add is relatively low when using it, polyaluminum chloride has poor neutralization ability for high alkalinity of printing and dyeing wastewater, and its application is subject to certain restrictions. After years of research, the two coagulants are used together, and the complementary advantages of the two and the synergistic effect of the common ion effect are used to treat printing and dyeing wastewater, which can reduce the treatment cost and improve the treatment effect.
4. Treatment of oily wastewater Oily wastewater mainly refers to a lot of produced water generated by oil field exploitation of crude oil, oily wastewater discharged by refineries and petrochemical plants, and wastewater generated by cleaning tankers and vehicles. Generally, the treatment of oily wastewater mainly adopts oil separation sedimentation, flotation and biochemical methods. The combined use of polyaluminium chloride and modified cationic polyacrylamide for coagulation sedimentation filtration treatment of oily wastewater has a very good treatment effect. The relative molecular weight of modified cationic polyacrylamide should not be too high, and it should be easy to compound with polyaluminium chloride to achieve the ideal effect.
The main products of flocculant manufacturer Xinhuan Water Treatment are:
White polyaluminium chloride (food grade), drinking grade polyaluminium chloride, industrial grade polyaluminium chloride, anionic polyacrylamide, cationic polyacrylamide, nonionic polyacrylamide, petroleum recycling polyacrylamide, oil recovery polyacrylamide, polyacrylamide, polymer flocculant polymer flocculation coagulant, polymeric ferrous sulphate, polyferric aluminium chloride and other water treatment chemicals. Welcome customers to write to us to negotiate business! Tel/WhatsApp：+8619003830067 Email：joanna@xhwtm.com Contact:Joanna
