Polymeric aluminium chloride in the use of which sewage treatment advantages are obvious

    In the treatment of sewage, one of our most common water treatment consumables to purify sewage is Polymeric Aluminium Chloride(PAC) water purifier. Although polymerised aluminium chloride has the advantage of a wide range of waters, then its role in dealing with which kind of sewage is better?

First, the treatment of domestic water after birth, that is, the treatment of washing wastewater. Because the water contains a lot of appearance active agent, this agent if the oil, dust particles and other interaction reaction, will constitute a negatively charged colloidal particles, easy and stable in the water. If the appropriate amount of polymeric aluminium chloride in the wastewater, there will be a lot of positively charged cations, and the formation of the base of the bridge link of the multinuclear highly charged cooperative ions, can make the charge suspended in the colloidal particles on the outside of the strong adsorption of electricity and the ability to neutralise and compression of the double layer ability to make the colloidal particles to destabilise, and then the pollutants adsorption and deposition of aliens in the water body.

Second, paper wastewater treatment paper industry wastewater emissions, a large proportion of which comes from the section of water treatment, and there are many paper companies in the black liquor after pretreatment (anaerobic, strong acid treatment, cellulose isolation, neutralisation, etc.) is also mixed into the section of the water together with the treatment. Make the paper wastewater in the increase of harmful substances. Coagulation deposition with polymeric aluminium chloride treatment of paper middle water, followed by the increase in salinity, COD and SS removal rate increased. It should be noted here that the removal rate turned down after 75% of the salt base degree. In the temperature of 250 ℃, the addition of 75% of the salinity of polymeric aluminium chloride 0.6gL, can make the water to reach the national emission standards. In addition, polymeric aluminium chloride in paper wastewater treatment, because of the low price, and the slag can be returned to the paper-making process as raw materials, there is no secondary pollution problems, and can occur a certain economic benefits, so it has practical significance. The study found that polymeric aluminium chloride in alkaline (pH 7-9) conditions, when the coagulant dosage is greater than 750mgL, the suspended solids removal rate can reach more than 95%, and can remove 20-50% of CODCr.

Third, printing and dyeing wastewater treatment we are familiar with printing and dyeing wastewater, with high COD, chroma and ph value. Coagulation of its sewage is a common treatment method. Although the coagulation effect of Polyaluminum Chloride is good, we use the dosage is relatively low, but the neutralization ability of polymeric aluminium chloride on the high alkalinity of printing and dyeing wastewater is poor, and the application has been somewhat limited. After years of research, the co-operation of two coagulants, the use of both complementary advantages and the synergistic effect of the same ionic effect, the treatment of printing and dyeing wastewater can reduce the cost of treatment, while improving the treatment effect.

Fourth, oily wastewater treatment of oily wastewater mainly refers to the oilfield extraction of crude oil occurs a lot of water, refineries and petrochemical plants discharged oily wastewater as well as cleaning tankers and vehicles occurring by the wastewater containing. Generally, the treatment of oily wastewater mainly selects the method of oil separation and sedimentation, air flotation and biochemical. Polymeric Aluminium Chloride and modified cationic polyacrylamide are used in cooperation, coagulation, deposition and filtration treatment of oily wastewater, which has a very good treatment effect. The relative molecular weight of modified cationic polyacrylamide should not be too high, and it can be easily compounded with polymeric aluminium chloride (PAC) to reach the ideal effect.

Henan Xinhuan Water Treatment Materials Co., Ltd. is a professional company dedicated to the treatment of water pollution and resource use of high-tech environmental protection skills. The main business scope of our company is: sewage, sludge and wastewater treatment, and we have made a number of scientific research achievements and know-how, and successfully applied them to various categories of environmental pollution treatment projects.

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