Method for integrating sludge dewatering and sludge damp drying

Abstract

The invention discloses a method for integrating sludge dewatering and sludge damp drying, which comprises the following steps: dewatering sludge from sewage treatment plants; mixing; mixing dewatered sludge and sludge treated by a damp drying treatment for forming mixed sludge; drying the mixed sludge in a drying device by a direct heat exchange mode with outer heat source for forming damp drying sludge with 40 to 45% of the water content; gas-solid separating and screening the damp dried sludge, wherein sludge particle with 1 to 2mm of particle size is circularly used as damp drying sludge in the step. The present invention has the advantages that the method is simple, operation is easy, time of damp drying is short, drying, heat energy efficiency is high, gas phase products through gas-solid separation are sent to a rotary drum drier for a heat exchanging with the mixed sludge, recycle usage of energy is realized, tail gas processing burden can be minimized and the energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to an integrated method for sludge dehydration and sludge semi-drying. Background technique [0002] At present, even if many sewage treatment plants in my country have concentrated and dehydrated the sludge, they often fail to meet the requirements, and the moisture content of the sludge still does not meet the requirements of less than 80%. Inadequate sludge treatment not only increases the difficulty of transportation , and pose a threat to the surrounding environment of the transportation route, and what is worse, it poses a threat to the environment in which the sludge contacts, thus forming a "sludge pollution-sludge treatment-treatment is not in place-affecting sludge disposal-sludge secondary Pollution" vicious circle situation. [0003] The sewage treatment process is related to the sludge treatment and final disposal methods: [0004] (1) If the sludge in ...

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Problems solved by technology

[0004] (1) If the sludge in the sewage treatment plant adopts a post-stabilization process such as digestion, the sewage treatment process should not adopt an aerobic low-load treatment process with sludge stabilization;

[0005] (2) If the sludge from the sewage treatment plant is landfilled, since there are certain restrictions on the organic components of the landfill or garbage dump, it is not suitable for the sewage treatment plant to adopt a high-load sewage treatment process with a large amount of sludge;

[0006] (3) If the sludge in the sewage treatment plant is incinerated and the calorific value in the sludge needs to be used, the sewage treatment plant should not adopt the treatment process of low load and post-stabilization treatment of the sludge

Sludge drying is the process of evaporating the water in the sludge by providing heat. The traditional drying process usually not only consumes a lot of energy, but also the organic matter in the sludge that can be used as a resource Components (the source of calorific value), as well as the flocculant that can play a role in consolidation will be severely damaged, resulting in a reduction in the value of sludge resources available

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