Landfill leachate sludge dewatering composite biological enzyme conditioner as well as preparation method and use method thereof

Abstract

The invention relates to a landfill leachate sludge dewatering composite biological enzyme conditioner as well as a preparation method and a use method thereof. The conditioner comprises the following components in percentage by mass: 10-15% of cellulase; 5-8% of xylanase; 3-5% of laccase; 8-10% of pectinase; 12-18% of protease; 5-8% of chitosanase; 5-10% of lipase; 8-12% of fatty acid sorbitan; 10-15% of hexadecyl trimethyl bromide; 2-5% of sodium chloride; 1-3% of potassium sorbate; and 3-20% of deionized water. The components can be used for dewatering landfill leachate sludge after being mixed, extracellular polymeric substances in the sludge are extracted and damaged by the aid of the enzyme and the surfactant, so that water bound to the sludge is reduced, meanwhile, colloids and fine fibers in the sludge are modified and degraded by the conditioner, the filtering speed of water in the sludge is increased. The treated sludge is flocculated through a flocculating agent PAM, and finally, the dryness of the leachate sludge can be greatly improved through filter pressing and dewatering treatment, the dryness of the sludge after filter pressing can reach 55-65%, and the sludge can be directly incinerated together with garbage.

Description

technical field [0001] The invention relates to a biological enzyme preparation, in particular to a leachate sludge dehydration composite biological enzyme conditioner and a use method thereof. Background technique [0002] Leachate sludge is the terminal product discharged after leachate wastewater treatment in waste-to-energy plants, including primary sludge, biochemical sludge, blow-off sludge, and advanced treatment sludge. So far, the methods of leachate sludge disposal mainly include sea discharge, landfill, agricultural use and incineration. The premise of sludge composting, incineration or other resource utilization is to dehydrate the sludge to a certain degree of dryness. At present, there are many methods for dehydrating leachate sludge at home and abroad, including dry dehydration and mechanical dehydration. The energy consumption and comprehensive operation cost of dry dehydration are relatively high, and the mechanical method can make the sludge dryness meet t...

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Problems solved by technology

[0003] At present, by adding flocculants, taking measures to increase dehydration pressure, ensure dehydration time, avoid rewetting, and reduce dehydration resistance, it is possible to use mechanical methods to filter primary sludge and blow off sludge from landfill leachate. The water content of the cake is less than 50%, but this method is aimed at the landfill leachate biochemical sludge and advanced treatment sludge, the water content of the filter cake can only reach less than 60%, this is because the landfill leachate biochemical sludge, The presence of microbial extracellular polymers in advanced treatment sludge seriously affects the deep dehydration of landfill leachate sludge. Microbial extracellular polymers are organic polymer mixtures with extremely high water content produced by microorganisms. The surface of the fine fibers and bacterial micelles in the leachate sludge is easy to adsorb the transition metal ions and anion garbage in the landfill leachate sludge, which not only makes it difficult to remove the moisture inside the microorganisms and themselves, but also hinders the removal of water in the sludge. The migration of free water makes the deep dehydration of landfill leachate sludge extremely difficult. Therefore, how to select a suitable landfill leachate sludge conditioning technology to make a large change in the structure, composition and distribution of microbial extracellular polymers in sludge, Improving sludge dewatering performance is a key issue to be solved when developing new landfill leachate sludge dewatering technology

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