Dehydration and desiccation device and method for sewage sludge

Abstract

The invention relates to a dehydration and desiccation device and method for sewage sludge. The device comprises a wet sewage sludge storage and delivery system, a sludge dehydration system and a sludge desiccation system which are communicated through closed type pipelines and used for delivering, storing and modifying sludge, dehydrating the sludge and desiccating the sludge into grains respectively, wherein the sludge dehydration system comprises high pressure elastic press filtering equipment at a minimum so that working pressure of a filter press can be raised; the sludge desiccation system comprises horizontal type disc desiccation equipment at a minimum so that the sludge obtained after modification and dehydration can be desiccated. The dehydration and desiccation device is applicable to treatment and disposal of sludge of different water contents, and the sludge from different sewage treatment plants can all be treatment through the process. The sludge is sent into a sludge bin in the mode of vehicle carrying and transportation and then delivered through a pump and the pipelines, environmental pollution caused by delivery of the sludge is not caused, and environmental sanitation is good.

Description

technical field [0001] The invention relates to the field of sewage sludge treatment. The invention relates to a dehydration and drying device and method for urban sewage sludge, which is suitable for the treatment of sludge in urban sewage treatment plants, and is also suitable for the treatment of biogas residue after anaerobic digestion of urban waste organic matter Wait. Background technique [0002] The treatment and disposal of urban sewage sludge includes the requirements of sludge stabilization, reduction, harmlessness and resource utilization; sludge reduction is the core link of sludge treatment, and the main goal is to reduce the moisture in sludge; Sludge reduction methods include mechanical dehydration, thermal drying, etc.; in the process of sludge treatment and disposal, there are various combinations of processes. [0003] Mechanical dehydration methods include chamber filter press, diaphragm filter press, belt filter press, etc., among which diaphragm filte...

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Problems solved by technology

[0009] 1. The degree of sludge reduction by the filter press method is insufficient: the moisture content after dehydration by the filter press method is generally about 80%, the degree of sludge reduction is not enough, and the volume of the sludge after dehydration is still large, which is not convenient for final disposal; medium pressure Diaphragm filter press (working pressure 15-18bar) can reduce the moisture content of sludge to 60%, but it needs to add more conditioner (conditioning amount 30-50% / tDS), and the conditioned sludge can only enter landfill disposal;

[0010] 2. There are often more than two urban sewage treatment plants in an urban area, and the sludge dehydration methods and dehydration effects of each sewage treatment plant are different; the centralized sludge treatment plant needs to meet the requirements of multiple incoming sludge and large changes in moisture content;

[0011] 3. The direct drying method requires a large amount of hot flue gas, and the hot flue gas treatment after direct contact contains odor, which is difficult to deal with;

[0012] 4. The indirect drying method generally uses steam as the heat medium. Drying one ton of sludge usually requires 0.8-1.0t of steam (0.6Mpa, 160°C), and the treatment cost is relatively high

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