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[China Aluminum] In the treatment of sewage, one of our common water treatment consumables for purifying sewage is polyaluminium chloride water purifying agent. Although polyaluminum chloride has the advantage of a wide water area, what kind of wastewater can be better treated?
First, domestic water is treated with water after birth, which is the treatment of washing wastewater. Since the water contains a large amount of surfactants, this kind of agent reacts with the interactions of oil and dust particles to form negatively charged colloidal particles and it is easily and stably retained in water. If a suitable amount of polyaluminum chloride is added to the waste water, a large number of positively charged cations will be generated, and multinuclear highly charged complex ions formed by bridging and bridging will enable the charge suspended on the surface of the colloidal particles to be very strong. Adsorption of electricity neutralizing ability and the ability to compress the double layer, and then make the colloidal particles destabilized, and then the pollutant adsorption sedimentation separation of water.
2. Papermaking Wastewater Disposal Wastewater from the papermaking industry has a large amount of discharge, of which a large proportion comes from section water treatment, and there are many papermaking companies that have black liquor after pretreatment (anaerobic, strong acid treatment, cellulose separation, neutralization, etc.) Also mixed into the middle section of water together. Causes the increase of harmful substances in papermaking wastewater. Treating the mid-water of papermaking with polyaluminum chloride coagulation and sedimentation, the removal rate of COD and SS increased with the increase of alkalinity. It should be noted here that after 75% of the basicity of the salt, the removal rate dropped. At a temperature of 250°C, the addition of 0.6gL of polyaluminum chloride with a salt base degree of 75% will enable the effluent to meet the national emission standards. In addition, the polyaluminum chloride in the papermaking wastewater treatment, due to the low price, and the sediment can be returned to the papermaking process as raw materials, there is no secondary pollution problems, and can produce a certain degree of economic benefits, so it has practical significance. It was found that when the amount of coagulant is greater than 750 mgL, the polyaluminum chloride can reach 95% or more of the suspended solids under alkaline conditions (pH 7-9), and 20-50% of CODCr can be removed. .
Third, printing and dyeing wastewater treatment We are familiar with printing and dyeing wastewater, with a higher COD, color and ph value. The coagulation of its sewage is one of our commonly used treatment methods. Although the coagulation effect of polyaluminum chloride is good, the amount of dosing that we add when using it is relatively low. However, polyaluminum chloride has poor neutralization ability for printing and dyeing wastewater with high alkalinity, and its application is limited. Through years of research, with the use of two kinds of coagulants, the use of complementary advantages and the synergy effect of the same ion effect, the treatment of printing and dyeing wastewater can reduce the processing costs, while improving the treatment effect.
IV. Oily Wastewater Treatment Oily waste water mainly refers to the large amount of produced water produced from the exploitation of crude oil in oil fields, the oily wastewater discharged from oil refineries and petrochemical plants, and the waste water generated from the cleaning of oil tankers and vehicles. The treatment of general oily wastewater mainly uses oil separation, air flotation and biochemical methods. Polyaluminum chloride and modified cationic polyacrylamide are used together, and the coagulation and sedimentation filtration treatment contains wastewater, which has a very good treatment effect. The relative molecular weight of the modified cationic polyacrylamide cannot be too high, and it is easy to compound with the polyaluminum chloride to achieve the desired effect. Suzhou Shengnuo Company is a modern technology company specializing in the treatment of water pollution. It provides consultancy services for waste water treatment technologies for various industries and undertakes post-processing of sewage treatment works.
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