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Next, let’s talk about the application scenarios of polyaluminum chloride under Xintai Group.
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2022-11-08
The editor of Xintai Group would like to inform everyone that industrial papermaking wastewater discharge volumes are substantial. After pretreatment, the black liquor generated by the papermaking industry is mixed with mid-stage wastewater for joint treatment, thereby increasing the concentration of harmful substances in the papermaking wastewater. Polyaluminum chloride is used in the treatment of mid-stage wastewater in the papermaking process.
Next, let’s talk about the application scenarios of polyaluminum chloride under Xintai Group.
Xintai Group: Application Scenarios of Polymeric Aluminum Chloride
The editor of Xintai Group would like to inform you that industrial papermaking wastewater discharge volumes are substantial. The black liquor generated by the papermaking industry, after preliminary treatment, is mixed with mid-stage wastewater for joint treatment, thereby increasing the concentration of harmful substances in the papermaking wastewater. When polyaluminum chloride is used for treating mid-stage papermaking wastewater, the removal rates of COD and SS both increase with rising alkalinity. However, once the alkalinity reaches 75%, the removal rates no longer increase but instead begin to decline. At a temperature of 250°C and with a salt content of 75% in the polyaluminum chloride, the effluent can meet national discharge standards. When using polyaluminum chloride to treat papermaking wastewater, the cost is low, and the resulting precipitate can be recycled as a raw material back into the papermaking process, thus avoiding secondary pollution and even generating tangible economic benefits. Experimental evidence shows that when the dosage of the coagulant exceeds 750 mg/L, in an alkaline environment (pH 7–9), the polyaluminum chloride can achieve a suspended solids removal rate of over 95% and a CODCr removal rate ranging from 20% to 50%.
The editor from Xintai Group would like to inform you that polyaluminum chloride can treat wastewater generated from daily domestic water use and washing effluents, as well as remove oil stains, dust particles, and other contaminants. It reacts with the large amounts of surfactants present in water, forming negatively charged colloidal particles that readily remain suspended in the water. When an appropriate amount of polyaluminum chloride is added to wastewater, it releases positive cations and highly charged polynuclear coordination ions. These ions impart adsorption-neutralization capabilities and double-layer compression effects to the charges on the surface of the colloidal particles, destabilizing them and causing them to aggregate, settle, and separate from the water body.
Dyeing and printing wastewater contains high levels of COD, pH, and color. Although polyaluminum chloride exhibits excellent coagulation performance and requires a low dosage during use, it has limited neutralizing capacity for highly alkaline dyeing and printing wastewater, which restricts its application. By leveraging the complementary advantages of two different coagulants and harnessing the synergistic effects of common-ion phenomena, treating dyeing and printing wastewater can not only reduce treatment costs but also enhance treatment efficiency.
The editor of Xintai Group would like to inform you that oily wastewater refers to wastewater containing oil generated during oilfield exploitation, refinery operations, and petrochemical plant production. Such wastewater can be treated using methods such as oil-water separation and sedimentation, air flotation, and biochemical treatment. When modified cationic polyacrylamide is used in combination with polyaluminum chloride, the treatment effect is particularly remarkable. The relative molecular weight of the modified cationic polyacrylamide should not be too high; only when it is easily compatible with polyaluminum chloride can the desired optimal treatment result be achieved.
That’s all for today’s explanation of “Application Scenarios of Polymeric Aluminum Chloride” by our Xintai Group editor. Does everyone understand now? We hope our explanation has been helpful to you. If you’d like to learn more about this topic, please feel free to contact us at Xintai Group. Thank you for watching!
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