A Process for Improving the Dewatering Performance of Excess Sludge

Abstract

The invention discloses a technology for improving the dewaterability of excess sludge. The technology includes the first step of low-temperature plasma aeration, the second step of acidity regulation, the third step of fenton-like oxidation and the fourth step of plate-frame pressure filtration. The low-temperature plasma technology is combined with fenton-like oxidation for treatment the excess sludge together, sludge cell walls are effectively damaged, and the dewaterability of the sludge is improved. The water content after sludge dewatering is lower than 60%, the salt content is low, the heat value is high, and the technology is suitable for sanitary landfill and incineration and also suitable for aerobic fermentation to prepare biological organic fertilizers.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a process for improving the dewatering performance of excess sludge. Background technique [0002] In 2015, the national sewage treatment volume was 78.4 billion tons, and the sludge production volume was 34 million tons (water content 80%), and the sludge production volume continued to grow at a high rate year by year. While China's sewage treatment industry continues to make progress, it will face The huge pressure of sludge treatment and disposal. The residual sludge of urban sewage plants has the characteristics of large amount, high moisture content (generally above 98%), complex and changeable composition, rich in organic matter, containing a large number of pathogenic bacteria and parasites, perishable, difficult to dehydrate, and high in heavy metal content. If it is not harmless and stabilized, it will cause secondary pollution to the soil and the atmosphere, w...

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Problems solved by technology

This patent uses a strong inorganic acid to adjust the pH to 3~4, which will not only cause corrosion to the dosing system, reaction system and pipelines, but also need to add a large amount of lime milk to adjust the pH to treat the filtrate. The whole process is cumbersome and consumes a lot of chemicals. and requires a lot of equipment and manpower

In addition, when the remaining sludge stays in the sludge thickening tank for a long time, it is prone to anaerobic digestion to produce reducing substances such as sulfide, ammonia, methane, etc., and it is difficult to adjust and temper the sludge moisture content to below 60%. , the research and development of a new simple and easy-to-operate sludge treatment process that can realize the resource utilization of sludge has very important economic, technical, environmental and social significance

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