A method for continuous deep dehydration and low-temperature sludge drying

Abstract

The invention provides a continuous deep dewatering and low temperature drying cooperation system for sludge. The continuous deep dewatering and low temperature drying cooperation system comprises a preliminarily dewatered sludge storage bin, a sludge modification mixing machine, a sludge dewatering machine, a dewatered sludge cache bin and low temperature drying equipment, wherein the preliminarily dewatered sludge storage bin, the sludge modification mixing machine, the sludge dewatering machine and the dewatered sludge cache bin are connected in sequence through a conveyer; the low temperature drying equipment is located below the dewatered sludge cache bin. The invention further provides a continuous deep dewatering and low temperature drying cooperation method for the sludge. The continuous deep dewatering and low temperature drying cooperation method and the continuous deep dewatering and low temperature drying cooperation system which are provided by the invention can be widely applied to deep dewatering and drying treatment of preliminarily dewatered sludge in a sewage treatment plant, so as to reduce the moisture content of the preliminarily dewatered sludge from 75 to 85 percent to 10 to 45 percent, and finally realize reduction, stabilization and recycling of the sludge; meanwhile, the investment cost of the equipment and the operation cost of the system are reduced.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and disposal, and relates to a method and system for continuous deep dehydration and low-temperature sludge drying. Background technique [0002] With the construction and operation of a large number of sewage treatment plants across my country, the sewage treatment rate has increased significantly, and the sludge output has also increased simultaneously. Based on a moisture content of 80%, by the end of 2012, the total annual sludge output in China had exceeded 30 million tons. According to forecasts, by 2020, the amount of sludge will exceed 60 million tons per year. Sewage plant sludge is rich in organic matter, heavy metals, pathogenic microorganisms and other toxic and harmful substances contained in sewage, which has greater biological toxicity. On the other hand, the "Water Ten Measures" issued in April 2015 further stipulates the promotion of sludge treatment and disposal: "The ...

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Problems solved by technology

This method can reduce the moisture content of the sludge to 60%, but the method is complicated and the cost is high

[0006] Chinese patent CN200920067632.4 provides a system for drying sludge using solar energy. It first collects solar energy through the insulation shed, and then transfers the heat to the sludge drying rotary kiln through the solar heat collecting air duct to realize sludge drying. There are problems such as limited efficiency of solar energy utilization, high energy consumption, limited processing capacity, unstable drying effect, and greater influence by weather.

This method combines sludge modification, steam heating, and screw pressing to reduce the moisture content of dehydrated sludge to 60%. However, this method mainly relies on steam heating and heat exchange for sludge dehydration. higher

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