A Process for Improving the Dewatering Performance of Excess Sludge

A technology with excess sludge and dewatering performance, applied in water/sludge/sewage treatment, sludge treatment, sludge treatment and other directions, it can solve the corrosion of the reaction system and pipeline, the investment of large equipment and manpower, and it is difficult to temper the sludge. and other problems, to achieve the effect of harmless resource treatment and disposal, low equipment investment cost, and simple process

Active Publication Date: 2020-08-21
山东益源环保科技有限公司
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Problems solved by technology

This patent uses a strong inorganic acid to adjust the pH to 3~4, which will not only cause corrosion to the dosing system, reaction system and pipelines, but also need to add a large amount of lime milk to adjust the pH to treat the filtrate. The whole process is cumbersome and consumes a lot of chemicals. and requires a lot of equipment and manpower
In addition, when the remaining sludge stays in the sludge thickening tank for a long time, it is prone to anaerobic digestion to produce reducing substances such as sulfide, ammonia, methane, etc., and it is difficult to adjust and temper the sludge moisture content to below 60%. , the research and development of a new simple and easy-to-operate sludge treatment process that can realize the resource utilization of sludge has very important economic, technical, environmental and social significance

Method used

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  • A Process for Improving the Dewatering Performance of Excess Sludge

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Embodiment Construction

[0023] refer to figure 1 , a process for improving the dewatering performance of excess sludge, comprising the following steps:

[0024] Step 1: Low-temperature plasma aeration: pass the remaining sludge in the sludge thickening tank into the low-temperature plasma aeration tank through a hydraulic pump, and aerate for 30 minutes under the action of the low-temperature plasma aeration device to remove the sulfide in the remaining sludge Hydrogen, ammonia, cyanide, methane, methyl mercaptan and other reducing substances can improve the quality of sludge and reduce the amount of subsequent oxidants added;

[0025] Step 2: Acidity adjustment: Put the reacted sludge in step 1 into the sludge homogeneous tank with a stirring device through a hydraulic pump, turn on the stirring device, and use a metering pump to add 320g of 15% of the absolute dry weight of the sludge / L concentration of acidic catalyst solution to adjust the sludge pH to 6.0;

[0026] Step 3: Fenton-like oxidati...

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Abstract

The invention discloses a technology for improving the dewaterability of excess sludge. The technology includes the first step of low-temperature plasma aeration, the second step of acidity regulation, the third step of fenton-like oxidation and the fourth step of plate-frame pressure filtration. The low-temperature plasma technology is combined with fenton-like oxidation for treatment the excess sludge together, sludge cell walls are effectively damaged, and the dewaterability of the sludge is improved. The water content after sludge dewatering is lower than 60%, the salt content is low, the heat value is high, and the technology is suitable for sanitary landfill and incineration and also suitable for aerobic fermentation to prepare biological organic fertilizers.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a process for improving the dewatering performance of excess sludge. Background technique [0002] In 2015, the national sewage treatment volume was 78.4 billion tons, and the sludge production volume was 34 million tons (water content 80%), and the sludge production volume continued to grow at a high rate year by year. While China's sewage treatment industry continues to make progress, it will face The huge pressure of sludge treatment and disposal. The residual sludge of urban sewage plants has the characteristics of large amount, high moisture content (generally above 98%), complex and changeable composition, rich in organic matter, containing a large number of pathogenic bacteria and parasites, perishable, difficult to dehydrate, and high in heavy metal content. If it is not harmless and stabilized, it will cause secondary pollution to the soil and the atmosphere, w...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/02C02F11/06C02F11/122
CPCC02F11/00C02F11/06C02F11/122C02F2303/06Y02W10/20
Inventor 张永顺柴春省李令宝韦芳张敬
Owner 山东益源环保科技有限公司
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