Compounded sludge dewatering conditioner and application and method thereof

Abstract

The invention discloses a compounded sludge dewatering conditioner and application and a method thereof. The compounded sludge dewatering conditioner comprises the following components in parts by weight: 2-6 parts of ferric trichloride, 2-6 parts of magnesium chloride, 2-6 parts of calcium oxide, 1-3 parts of magnesium oxide, 1-3 parts of calcium aluminate, 2-4 parts of sodium dodecyl benzene sulfonate, 0.5-1 part of sulfuric acid and 0.5-1 part of ammonium chloride. After the sludge is dewatered by the compounded sludge dewatering conditioner, the moisture content of the sludge is reduced to be less than 45%, and the pH of the sludge is between 6-7; the sludge does not stink; less usage amount of the conditioner does not cause the problem of capacity increasing, and sludge reduction can be realized, so that the environmental benefit is good, the conditioner is beneficial to sludge resource utilization in following step, can be widely applied to sewage and sludge treatment in chemical industry, municipal administration and the like, and is very suitable for domestic sludge treatment in town sewage plants.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a composite sludge dewatering conditioner, and also relates to the application of the conditioner and a method for sludge dewatering. Background technique [0002] At present, sewage treatment plants generally use mechanical methods to dehydrate sludge, and this method can reduce the moisture content of sludge to between 75% and 85%. The "Notice on Strengthening the Prevention and Control of Sludge Pollution in Urban Sewage Treatment Plants" (Huanban [2010] No. 157) issued by the General Office of the Ministry of Environmental Protection in 2010 stipulates: For the purpose of transporting sludge to the factory, the sludge must be dehydrated to a moisture content of less than 50%. This poses a challenge to the traditional sludge dewatering technology that takes 80% water content as the factory standard. Seeking new sludge deep dehydration technology to achie...

AI Technical Summary

Problems solved by technology

Among the existing chemical conditioners, inorganic conditioners composed of ferric chloride, quicklime and fly ash are commonly used, but this type of conditioner must achieve a better dehydration effect compared to sludge with a moisture content of 80%. The requirements for equipment and process are high, the total amount of conditioner added accounts for more than 20% of the sludge ratio, the problem of sludge volume increase is serious, and the reduction of sludge has not been realized in fact

In addition, some conditioners combine inorganic conditioners with polyacrylamide, which can reduce the total amount of conditioner added to a certain extent, but because polyacrylamide is a viscous slurry, it will affect the efficiency of filtration and subsequent treatment. effect, and there are pollution problems such as refractory degradation

[0005] Therefore, the current difficulty in deep dewatering of sludge is that the existing conditioners have high cost, large dosage, complicated conditioning process, and have not achieved sludge reduction, which easily affects the subsequent utilization of sludge and has poor environmental benefits. Shortcomings

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