Method for improving dewatering property and settleability of sludge

Abstract

The invention discloses a method for improving dewatering property and settleability of sludge, and belongs to the field of solid waste treatment. The method for improving the dewatering property andthe settleability of the sludge comprises the following steps: mixing the modified rice hull ash and the sludge, and stirring to obtain the product. The preparation method of the modified rice hull ash comprises the following steps: burning rice hulls to obtain rice hull ash; mixing the rice hull ash with an aluminum chloride solution, carrying out ultrasonic treatment, carrying out solid-liquid separation, drying the separated solid, and grinding to obtain the modified rice hull ash. According to the method, the rice hull ash is modified by using the aluminum chloride, the sludge is treated by using the modified rice hull ash, the dewatering property and the settleability of the sludge can be obviously improved, and the method has an important effect on reducing the cost and the energy consumption of subsequent treatment of the sludge. According to the method, the rice hull ash is used as a raw material for improving the dewatering property and the settleability of the sludge, so thatthe waste of resources is avoided, the pollution of the rice hull and the sludge to the environment is avoided, and the method has the advantages of energy conservation, environmental protection, lowprice and the like.

Description

technical field [0001] The invention relates to a method for treating sludge by using modified rice husk ash to improve the dehydration and settling properties of the sludge, and belongs to the field of solid waste treatment. Background technique [0002] Sludge refers to the product of sewage treatment, which is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloids, etc. The main characteristics of sludge are high water content (the water content after dehydration is 70% to 80%) and high content of organic matter. Among the 192 compounds detected in sludge, 99 are identified as harmful compounds. Very hazardous solid waste. If it is not thoroughly treated and controlled, it will cause serious secondary pollution to the environment. [0003] At present, most of the urban sludge in China enters a disorderly temporary stockpiling or simple landfill state after leaving the sewage treatment plant, which not only occu...

AI Technical Summary

Problems solved by technology

At present, the safe disposal rate of sludge in China's sewage treatment plants is less than 35%, and the secondary pollution caused by random littering of sludge without harmless treatment is still very serious

The commonly used methods of sludge dehydration

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