Sludge dewatering and drying process technology and dewatering and drying system

Abstract

The invention belongs to the technical field of sludge dewatering and drying, and particularly relates to a sludge dewatering and drying process technology and a dewatering and drying system. The method comprises the following steps: 1) sludge pretreatment: carrying out odor collection treatment on sludge, and carrying out dehydration conditioning and disinfection sterilization on the sludge by adopting a sludge conditioner; 2) sludge dewatering: performing high-pressure plate-and-frame filter pressing on the conditioned sludge; and 3) sludge drying: heating the sludge with steam, condensing the steam generated by heating, and discharging the condensed steam, wherein the sludge conditioner comprises the following components: polyaluminum chloride, polyacrylamide, waste dried organisms anda mixture of biological enzymes. The adopted conditioner can reduce the moisture content of the sludge, sterilize and disinfect the sludge and reduce peculiar smell, then deep drying is conducted through plate-frame diaphragm filter pressing dehydration and steam serving as a heat medium, the weight and size of the sludge are greatly reduced, reduction of municipal sludge is achieved, and the moisture content of the sludge is reduced to 40% or below.

Description

technical field [0001] The invention belongs to the technical field of sludge dehydration and drying, and in particular relates to a sludge dehydration and drying process technology and a dehydration and drying system. Background technique [0002] With the rapid growth of my country's urban sewage treatment capacity, the sludge output of sewage treatment plants has also increased significantly. Sludge contains heavy metals, pathogenic bacteria, parasite eggs and other harmful substances that endanger human health. If not handled properly, it will pollute the environment, soil, crops and water bodies. [0003] It is predicted that by 2022, the sludge generated in my country's urban sewage treatment process will reach 89.09 million tons, and the sludge disposal problem is becoming increasingly severe. At present, sludge disposal in my country mainly adopts separate or joint landfill with domestic waste. With the increasing shortage of land resources and increasing environme...

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Problems solved by technology

[0004] The existing sludge treatment process includes: 1) Combination of microwave and high-pressure plate and frame treatment. First, the sludge is deodorized by microwave conditioning, then dehydrated by high-pressure diaphragm filtration, and finally deep-dried by microwave. However, there are Defects such as difficulty in stabilizing the water content of the plate and frame filter press, high microwave energy consumption, and potential safety hazards; 2) The plate and frame filter press and low-temperature drying process first concentrates the sludge, then reduces the water content through the plate and frame filter press, and finally Low temperature drying reduces the water content to 40%, but there are problems such as high investment cost, high equipment depreciation rate, low energy efficiency ratio and environmental impact due to large amount of dust

[0005] Sludge has characteristics such as high moisture content, bulky volume, and easy corruption and odor, which are not conducive to transportation and disposal

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