A method of applying natural friendly compound conditioner to realize efficient dehydration of sludge

Abstract

The invention relates to application of a natural friendly sludge composite conditioning agent and a dehydration method for improving the sludge processing performance. First, sludge with a water content of 97 to 99% is condensed until the water content reaches 90 to 93%; secondly, cationic etherified starch, which accounts for 0.2 wt% to 1 wt% of the solid phase of sludge to be processed, is added into the condensed sludge, and then the mixture is stirred for five minutes; thirdly, chitosan, which accounts for 0.1 wt% to 1 wt% of the solid phase of the sludge to be processed, is added into the mixture, and then the mixture is stirred for ten minutes; fourthly, modified silicon-calcium slag with a rigid skeleton, which accounts for 10 wt% to 100 wt% of the solid phase of the sludge, is added, and then the mixture is stirred for five minutes; finally, the conditioned sludge is transported to a press-filtering dehydration device to carry out operations of filtering, squeezing, and dehydrating. The provided method has the following advantages: (1) the composite conditioning agent is non-toxic and harmless, does not generate any secondary pollution, and does not corrode the sludge transportation lines and dehydration equipment; (2) the sludge processing performance is improved by seven times after the novel technology is adopted; (3) the water content of a dehydrated filter cake is reduced by 10% compared to the original technology; (4) the processed sludge can be directly buried, burned or composted, and can meet the national environmental requirements; (5) the technology is simple, and the provided method can be applied to industry.

Description

technical field [0001] The invention relates to the technical field of sludge dewatering, in particular to a high-efficiency dewatering method in the natural and friendly sludge production process. Background technique [0002] With the development of cities and industries, sewage sludge has increased dramatically, and environmental hazards have been paid more and more attention. Sludge dehydration reduction is a key part of the sewage treatment process and is an important guiding direction for the country on sludge treatment. my country's standards for different sludge disposal methods require that the moisture content of the filter cake after sludge dewatering is not higher than 60wt%. However, the sharp increase in sludge production and the serious shortage of sludge treatment capacity and treatment methods have formed a sharp contradiction, causing a large amount of sludge to be piled up randomly, which has brought great harm to the natural environment, including water,...

AI Technical Summary

Problems solved by technology

The flocculant iron salt has a corrosive effect on the operating equipment, and the residual metal in the final product is harmful to the environment; polyacrylamide is biologically toxic, difficult to be biodegraded, and seriously endangers human health (such as: dementia), so Substances containing polyacrylamide cannot be discharged directly to avoid secondary pollution

In addition, in the existing sludge dewatering process, the sludge with a water content of 97-99% is directly fed into the plate and frame filter press for dehydration without concentration. Decreased processing capacity and increased labor intensity

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