Henan Xinhuan Polyaluminium Chloride Division specializes in the production and supply of polyaluminium chloride, with complete contents and complete processes, and can provide you with the most suitable products according to customer needs. Today, Xinhuan Xiaobian will briefly introduce the application of polyaluminium chloride in 5 types of industrial water treatment.
1. Printing and dyeing wastewater treatment
Printing and dyeing wastewater has high COD, chromaticity and pH value, and drug coagulation is a common method for its treatment. Although polyaluminium chloride has good coagulation effect and low dosage, polyaluminium chloride has poor neutralization ability for high alkalinity of printing and dyeing wastewater, and its use is subject to certain restrictions. Traditional coagulant A12(S04)3 hydrolyzes to produce H+, which can neutralize the alkali in printing and dyeing wastewater and has strong neutralization ability for alkalinity. Studies have shown that the combined use of these two coagulants, taking advantage of the complementary advantages of the two and the synergistic effect of the common ion effect, can reduce the treatment cost and improve the treatment effect of printing and dyeing wastewater.
2. 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 oily wastewater generated by cleaning tankers and vehicles. The treatment of oily wastewater mainly adopts oil separation sedimentation, flotation and biochemical methods. The combined use of polyaluminum chloride and modified cationic polyacrylamide, coagulation sedimentation filtration to treat oily wastewater has a very good treatment effect. The relative molecular weight of modified cationic polyacrylamide cannot be too high, and it can achieve the desired effect by simple compounding with polyaluminum chloride.
3. Treatment of papermaking wastewater
The papermaking industry has a large amount of wastewater discharge, of which intermediate water accounts for a large proportion, and many papermaking enterprises also mix the black liquor with intermediate water after pretreatment (anaerobic, strong acid treatment, cellulose separation, neutralization, etc.). Polyaluminum chloride is used to coagulate and sediment to treat the intermediate water of papermaking. With the increase of basicity, the removal rate of COD and SS increases. However, after the basicity>75%, the removal rate decreases. At a temperature of 250°C, adding 0.6g/L 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 materials, there is no secondary pollution problem, and it can generate certain economic benefits. Studies have found that under alkaline conditions (pH 7-9), when the amount of coagulant added is greater than 750mg/L, the removal rate of suspended solids can reach more than 95%, and 20-50% of CODCr can be removed.
4. Mechanical processing wastewater treatment
Emulsions are widely used in mechanical processing as cooling, lubricating, cleaning and rust preventive agents to improve product quality. During use, the emulsion is subjected to the selective adsorption of bacteria, microorganisms, high temperature, and metal chips, and gradually changes from milky white to gray-black, and becomes corrupt and smelly. Static coagulation was used to treat emulsified wastewater, adding 2g/L polyaluminium chloride, 2mL/LPAM (8%), the optimal pH range was 6.5-7.5, the coagulation time was 6min, the static separation time was 60min, the effluent was clear and transparent, the oil content was less than 10mg/L, 800mg/L. If it was treated with coal slag ash adsorption, the effluent oil content was less than 3mg/L, COD<300mg/L
5. Treatment of washing wastewater
There are many surfactants in washing wastewater. Surfactants react with oil, dust particles, etc. to form negatively charged colloidal particles, which can exist relatively stably in water bodies. Adding polyaluminium chloride to washing wastewater will produce a large number of positively charged cations and multi-nuclear high-charge cooperative ions formed by radical bridging. They have strong adsorption and electrical neutralization capabilities and double-layer compression capabilities for the charges on the surface of suspended colloidal particles, causing the colloidal particles to destabilize. Finally, the high-polymer hydroxide formed will adsorb and precipitate the pollutants and separate them from the water body.
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
