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A kind of anaerobic drying treatment method of excess sludge

A treatment method and excess sludge technology, which is applied in the field of anaerobic digestion gas production, cell wall breaking of excess sludge, and drying treatment, can solve the problem of large-scale application of excess sludge, high processing cost, and ultrasonic pretreatment High technical investment costs and other issues, to achieve the effect of accelerating anaerobic digestion rate, increasing gas production, and reducing removal resistance

Active Publication Date: 2021-08-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ultrasonic pretreatment technology adopted in this invention has the problems of high investment cost and high processing cost.
It is difficult to apply to the status quo of surplus sludge pretreatment in my country on a large scale

Method used

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  • A kind of anaerobic drying treatment method of excess sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The specific embodiment of the present invention will be described by taking the excess sludge of a certain sewage treatment plant as an example. Add 1.2% TS sludge (TS is the total solid content of sludge) sodium perchlorate and 2% TS tributyl phosphate to 200kg of excess sludge with a water content of 98.5% and add 1.25% TS sludge After the polymyxin, the high-speed shear knife was started to perform high-speed shearing and breaking of the sludge wall at a speed of 20000r / min for 2h. The VSS reduction rate of the sludge after breaking the wall was 27.74%, and the SCOD increased by 24.95 times of the original sludge. After the wall is broken, the sludge is passed into an anaerobic fermentation tank, and anaerobic granular sludge of 1 / 8 of the remaining sludge volume is added for anaerobic digestion, and the temperature is controlled at 35°C. After 16 days of anaerobic digestion, the cumulative methane production increased by 44.26% compared with the direct anaerobic d...

Embodiment 2

[0036] Basically the same as Example 1, the difference is that the treatment agent is sodium perchlorate and 0.25% TS tributyl phosphate of 0.18% TS sludge, and colistin is added to 0.15% TS sludge, other process conditions and steps With embodiment 1. After the wall was broken, the VSS reduction rate of the sludge was 26.64%, and the SCOD increased by 23.60 times of the original sludge. After 18 days of anaerobic digestion, the cumulative methane production increased by 41.52% compared with the direct anaerobic digestion of raw mud. The moisture content of the sludge after dehydration is 62.56%. The moisture content of the remaining sludge after drying was reduced to 11.8%.

Embodiment 3

[0038] It is basically the same as Example 1, except that the treatment agent is sodium perchlorate of 0.8% TS sludge and tributyl phosphate of 1% TS sludge, and the polymyxin and 0.5% of TS sludge are added The colistin of %TS sludge, other technological conditions and steps are with embodiment 1. The reduction rate of sludge VSS after wall breaking was 30.03%, and SCOD increased 28.26 times of the original sludge. After 15 days of anaerobic digestion, the cumulative methane production increased by 52.91% compared with direct anaerobic digestion of raw mud. The moisture content of the sludge after dehydration is 60.48%. The moisture content of the remaining sludge after drying is reduced to 9.2%.

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Abstract

The invention discloses an anaerobic drying treatment method for excess sludge. In the treatment method, firstly, the excess activated sludge is sent into a high-speed shear homogenization tank, and then a treatment agent is added into the homogenization tank for shear homogenization. After that, it is sent to the sludge anaerobic fermentation tank for anaerobic gas production and biogas recovery. After the anaerobic sludge is sent to the sludge dehydrator for dehydration, dehydrated cake and sewage are obtained. The sewage is sent to the sewage plant for further treatment, and the obtained The dehydrated cake is sent to the molding machine to be extruded into strips, and then enters the biogas through the conveyor belt to heat the multi-layer mesh belt low-temperature drying box for drying to obtain dried sludge with a moisture content of less than 15%. The method of the invention can reduce the moisture content of the remaining sludge to below 15%, greatly reducing the volume of the sludge, and the drying energy consumption is self-sufficient, and the drying sludge can be used as a further resource raw material or incinerated.

Description

technical field [0001] The invention relates to a method for treating surplus activated sludge, in particular to a treatment method for cell wall breaking, anaerobic digestion, gas production and drying of surplus sludge. Background technique [0002] As the residual product of sewage treatment, the residual activated sludge has a moisture content of over 97%, is perishable, has a foul smell, and contains a large amount of harmful substances such as pathogenic microorganisms, parasite eggs or heavy metals. Direct discharge will bring serious secondary damage to the environment. pollute. Sludge treatment and disposal are indispensable in sewage treatment. Without this link, sewage treatment will not be truly completed. Since the 1980s, my country has started large-scale construction of modern sewage treatment plants, but has always ignored the importance of sludge treatment and disposal. According to statistics, in the construction of sewage treatment plants in developed cou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C02F11/127C02F11/122C02F11/123C02F11/13
CPCY02E50/30
Inventor 吴巍回军孙浩程刘春阳李宝忠
Owner CHINA PETROLEUM & CHEM CORP