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A method for promoting sludge hydrolysis to release dissolved organic matter

A technology of dissolved organic matter and sludge, applied in water/sludge/sewage treatment, sludge treatment, biological sludge treatment, etc., can solve the problems of high moisture content, high content of organic components and secondary pollution in activated sludge and other problems, to achieve the effect of enhanced dehydration, easy operation and low energy consumption

Active Publication Date: 2020-06-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activated sludge has the characteristics of high water content, high organic component content and complex composition. If it is not treated effectively, it will easily cause secondary pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 1 kg of primary sludge and 1 kg of excess sludge from the sewage treatment plant (the mass ratio of primary sludge and excess sludge is 1:1) to form the mixed sludge for treatment in this example. Add 10% urea and 10% NaOH to the mixed sludge, and then pre-cool the sludge at 4 °C for 1 hour. During the pre-cooling process, the sludge is anaerobically stirred at a stirring speed of 100 rpm. Increase the dissolution of organic matter.

[0020] According to the method of the above-mentioned embodiment 1, the mixed sludge is compared with the original residual sludge without adding any substances:

[0021] After the mixed sludge was treated according to the method of the above-mentioned Example 1, the dissolved organic matter was measured, mainly the content of sugar and protein. Basic properties of sludge: total suspended solids TSS=20 g / L; volatile components accounted for VSS / TSS=70%.

[0022] Blank control group (no treatment): soluble sugar concentration: 12 mg / ...

Embodiment 2

[0025] Take 1 kg of primary sludge and 1 kg of excess sludge from the sewage treatment plant (the mass ratio of primary sludge and excess sludge is 1:1) to form the mixed sludge for treatment in this example. Add 10% NaOH and 10% urea to the mixed sludge, and then pre-cool the sludge at 4°C for 2 hours. During the pre-cooling process, the sludge is anaerobically stirred at a stirring speed of 100rpm. Increase the dissolution of organic matter.

[0026] The sludge treated by the method of the above-mentioned Example 2: soluble sugar concentration: 1272 mg / L, soluble protein 6340 mg / L.

Embodiment 3

[0028] Take 1 kg of primary sludge and 1 kg of excess sludge from the sewage treatment plant (the mass ratio of primary sludge and excess sludge is 1:1) to form the mixed sludge for treatment in this example. Add 10% NaOH and 10% urea to the mixed sludge, and then pre-cool the sludge at 4°C for 0.5 hours. During the pre-cooling process, the sludge is anaerobically stirred at a stirring speed of 100rpm. Increase the dissolution of organic matter.

[0029] The sludge treated by the method of the above-mentioned Example 3: soluble sugar concentration: 783 mg / L, soluble protein 4158 mg / L.

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Abstract

The invention relates to the technical field of environmental protection and discloses a method for promoting sludge hydrolysis to release soluble organic matters. The method comprises the following steps: separately taking primary settled sludge and remaining sludge from a sewage treatment plant to form mixed sludge, wherein the mass ratio of the primary settled sludge to the remaining sludge is (10:1) to (1:10); adding urea and alkali into the mixed sludge, wherein the mass of the urea added is 15% lower than that of the mixed sludge, and the mass of the alkali added is 15% lower than that of the mixed sludge; carrying out precooling for 0.5 to 3 hours at the temperature of 0 DEG C to 5 DEG C; carrying out anaerobic stirring on the sludge at a stirring rate of 20rpm to 150rpm during precooling, so as to improve the dissolving-out of the organic matters. According to the method, through adding the alkali and the urea and then carrying out precooling treatment, the disruption of the sludge and the dissolving-out of the organic matters are greatly promoted, so that rich substrates can be provided for the anaerobic fermentation of the sludge, and the resource utilization of the sludge is achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, in particular to a method for greatly promoting sludge hydrolysis to release organic matter. Background technique [0002] Activated sludge process is a widely used sewage biological treatment technology, which can remove nitrogen and phosphorus while removing organic matter. However, the activated sludge process produces a large amount of sludge (including primary sludge and residual sludge) while treating sewage. Specifically, primary sludge refers to the sediment discharged from the primary sedimentation tank of a sewage treatment plant , while the remaining sludge refers to the activated sludge discharged from the system from the secondary sedimentation tank (or sedimentation area) in the activated sludge system). Activated sludge has the characteristics of high water content, high organic component content and complex composition. If it is not treated effectively, it will e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/04
CPCC02F11/00C02F11/04
Inventor 陈银广郑雄余同郭敏
Owner TONGJI UNIV
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