A method of continuous deep dehydration and solar energy synergistically drying sludge

Abstract

The invention belongs to the technical field of sludge treatment and disposal, and relates to a continuous-deep-dewatering and solar-energy synergy sludge drying method. The continuous-deep-dewatering and solar-energy synergy sludge drying method includes the steps that primarily-dewatered sludge is subjected to continuous deep dewatering, and then subjected to solar-energy drying treatment, wherein continuous deep dewatering treatment comprises the sludge modifying treatment process and the squeezed dewatering treatment process. The invention further provides a continuous-deep-dewatering and solar-energy synergy sludge drying system. The continuous-deep-dewatering and solar-energy synergy sludge drying method can be widely applied to dewatering treatment of primarily-dewatered sludge of a sewage treatment plant, the moisture content of the primarily-dewatered sludge is reduced to 30% to 40% from 75% to 85%, and reduction, harmless and resource utilization of sludge is finally achieved.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment and disposal, and relates to a method for drying sludge in cooperation with continuous deep dehydration and solar energy. 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:...

AI Technical Summary

Problems solved by technology

High-pressure plate and frame filter deep dehydration technology must adjust the primary dewatered sludge to sludge with a moisture content of about 95% (or add PAM and mechanical concentration to reduce the moisture content of wet sludge to 95%), which can make the primary The moisture content of the dewatered sludge is reduced to below 60%, but the process has a large area of ​​equipment, complex system, long pressing time, inability to continuously discharge materials, high site requirements (need to set up a raised platform), ferric chloride corrosion, etc. shortcoming

[0005] Chinese patent CN200710181080.5 provides a solar activated sludge drying device, which mixes and spreads dry and wet sludge through a high-pressure blower, and turns and throws sludge through an improved walking tractor to realize sludge drying. Solar drying; however, it uses a high-pressure blower to spread the sludge, which has the problems of uneven sludge spreading and high energy consumption. It uses an improved walking tractor to turn the sludge, which cannot be continuously and automatically operated And no drying sludge collection device

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 in utilizing solar energy, high energy consumption, and limited processing capacity.

The above solar drying devices all have defects such as long drying time, large floor space, and unstable drying effect. The main reason is that the sludge entering the solar drying bed is unmodified and has a high initial moisture content, which affects the Treatment effect of solar drying bed

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