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Method for treating biochemical sludge

A biochemical sludge and treatment method technology, which is applied in biological sludge treatment, sludge treatment, water/sludge/sewage treatment, etc., can solve the problem of small gas production and difficult utilization, large consumption of pulverized coal calorific value, and increased energy costs. and other problems, to achieve the effect of reducing the concentration of volatile suspended solids, improving the anaerobic digestion performance of sludge, and improving the performance of sludge dewatering

Inactive Publication Date: 2018-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also many disadvantages in incinerating sludge with high moisture content mixed with coal powder. On the one hand, the original design of the existing incinerator cannot adapt to the incineration of sludge with a large amount of water, which will cause damage to the equipment body; on the other hand, due to the moisture content High, low calorific value of sludge will consume a lot of calorific value of pulverized coal, increase energy costs, and low utilization rate; in addition, the content of organic matter in sludge is still high, which will make the tail gas treatment of incineration a new problem
[0003] Some sewage plants adopt anaerobic digestion treatment technology for biochemical sludge. Due to the natural barrier effect of microbial cell walls and cell membranes, the degradation rate of organic matter is lower, and the removal rate is between 35% and 45%. The removal rate is low and the residence time is long. The processing load is low, and the gas production is small and difficult to use, which makes operation management more difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Dilute the biochemical sludge with water so that its solid content is between 12%, SCOD is 570mg / l, and sludge viscosity is 65000cp;

[0022] (2) Perform thermal hydrolysis on the diluted biochemical sludge, and cool it down to room temperature naturally after thermal hydrolysis; wherein: the thermal hydrolysis temperature is between 200°C, and the thermal hydrolysis time is 20 minutes;

[0023] (3) Perform anaerobic digestion on the biochemical sludge obtained in step (2); the temperature is 45°C, the solid content of the feed is 16% to 17%, and the organic matter volume load is as high as 4kg / m 3 d, the residence time is 10 days, the content of organic matter in the biochemical sludge used in the test is as high as 60%, the decomposition rate of organic matter is 55%, and the gas production rate is 0.75Nm3 / kgVSS (removal).

[0024] (4) After the post-treatment biochemical sludge is press-filtered with a plate-and-frame filter press, the filter press pressure is 1....

Embodiment 2

[0026] (1) Dilute the biochemical sludge with water so that its solid content is between 5%, SCOD is 557mg / l, and sludge viscosity is 64537cp;

[0027] (2) Thermally hydrolyze the diluted biochemical sludge. After the thermal hydrolysis is completed, cool it down to room temperature naturally; wherein: the thermal hydrolysis temperature is between 170°C and the thermal hydrolysis time is 30 minutes;

[0028] (3) Perform anaerobic digestion on the biochemical sludge obtained in step (2); use high temperature digestion at 50°C, feed solid content of 16% to 17%, organic matter volume load up to 2kg / m 3 d, the residence time is 15 days, the organic matter content of the biochemical sludge used in the test is as high as 62%, the organic matter decomposition rate reaches 60%, and the gas production rate is 0.85Nm3 / kgVSS (removal).

[0029] (4) The post-treatment biochemical sludge is press-filtered with a plate-and-frame filter press, and the filter press pressure is 1.2mPa to obtai...

Embodiment 3

[0031] (1) Dilute the biochemical sludge with water so that its solid content is between 15%, SCOD is 549mg / l, and sludge viscosity is 63125cp;

[0032] (2) Thermally hydrolyze the diluted biochemical sludge. After the thermal hydrolysis is completed, cool it down to room temperature naturally; wherein: the thermal hydrolysis temperature is between 150°C and the thermal hydrolysis time is 90 minutes;

[0033] (3) Perform anaerobic digestion on the biochemical sludge obtained in step (2); use high temperature digestion, 50°C, feed solid content of 16% to 17%, organic matter volume load up to 8kg / m 3 d, the residence time is 5 days, the organic matter content of the biochemical sludge used in the test is as high as 62%, the organic matter decomposition rate is 61%, and the gas production rate is 0.78Nm3 / kgVSS (removal).

[0034] (4) Press filter the post-treated biochemical sludge with a plate and frame filter press, and the pressure of the filter press is 1.2mPa to obtain the d...

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Abstract

The invention discloses a method for treating biochemical sludge. The method comprises (1) diluting biochemical sludge through water so that the solid content is 5% to 15%, (2) carrying out pyrohydrolysis on the diluted biochemical sludge and then naturally cooling the diluted biochemical sludge to the room temperature, wherein the pyrohydrolysis temperature is in a range of 140-200 DEG C and pyrohydrolysis time is in a range of 20-90min, (3) carrying out anaerobic digestion post-treatment on the biochemical sludge and (4) press-filtering the treated biochemical sludge through a plate-and-frame filter press to obtain dehydrated sludge. The method has simple processes, high sludge treatment efficiency and good treatment effects.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a treatment method for biochemical sludge. Background technique [0002] At present, the biochemical sludge in the industry basically adopts the treatment methods of concentration, centrifugation or plate-and-frame filter dehydration, incineration in thermal power plants mixed with coal powder, or outsourcing for entrusted disposal, and the treatment efficiency is low. After the sludge is dehydrated, it still has a water content of 70% to 80%. The sludge reduction is limited, and the organic matter in the sludge has not been removed. In the presence of a large amount of water and organic matter, the microorganisms in the sludge are still active. The state has not been finally stabilized. There are also many disadvantages in incinerating sludge with high moisture content mixed with coal powder. On the one hand, the original design of the existing incinerator ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/10C02F11/04C02F11/12
CPCC02F11/00C02F11/04C02F11/10C02F11/122
Inventor 孙晓峰仓一华卢保中吴敏童海定邓睿石蓉芸史丹妮梁嘉杰梁坡
Owner CHINA PETROLEUM & CHEM CORP
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