Green treatment process for activated sludge

A technology of activated sludge and treatment process, which is used in dewatering/drying/concentrating sludge treatment, pyrolysis treatment of sludge, etc., which can solve the problem of not effectively separating activated sludge for comprehensive utilization, and failing to achieve zero discharge in the treatment process. problems, to achieve the effect of good product application, easy industrial production, simple process and equipment

Inactive Publication Date: 2009-05-27
天津市裕川置业集团有限公司
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AI Technical Summary

Problems solved by technology

The above-mentioned patents did not effectively separate the active components in the activated sludge for comprehensive utilization, and did not realize zero discharge in the treatment process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 includes the following sequence steps: the remaining activated sludge is adjusted by water content, PH is adjusted, heated and sealed for hydrolysis, the hydrolyzate is separated from solid and liquid, the solid phase is further dehydrated and used as building materials, the supernatant is further concentrated, and after deployment The water content of the product is 92%, the pH is adjusted by calcium hydroxide, the adjusted pH is 12, the hydrolysis temperature is 115°C, and the hydrolysis time is 3 hours. The solid-liquid separation adopts a centrifuge, and the supernatant is concentrated by thin-film evaporation.

Embodiment 2

[0021] Example 2, the difference from Example 1 is that the moisture content after deployment is 96%, the pH is not adjusted, the hydrolysis temperature is 180°C, the hydrolysis time is 2 hours, the solid-liquid separation adopts plate and frame filter press, and the solid phase After one wash, the washings were combined with the supernatant and the tube evaporated.

Embodiment 3

[0022] Embodiment 3, differs from Example 1 in that: the water content after deployment is 90%, pH adjustment uses phosphoric acid, the pH value after adjustment is 5, the hydrolysis temperature is 90 ° C, the hydrolysis time is 4 hours, and the hydrolyzate uses The sodium hydroxide is adjusted to near neutrality, the solid-liquid separation adopts belt filter press, and the supernatant is firstly membrane-filtered and then multi-effect evaporated.

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PUM

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Abstract

The invention relates to activated sludge, which comprises sludge which is rich in microorganisms, protozoan, metazoan, algae and other organic substances, for example, secondary riverway sludge, fluviolacustrine substrate sludge, sewer sludge and sewage disposal plant sludge, and particularly residual activated sludge of sewage disposal plants in cities and towns. The invention relates to the field of after-treatment of activated sludge generated during biochemical treatment of sewage and wastewater, and in particular to green treatment technology for the residual activated sludge. The green treatment technology for the residual activated sludge is characterized in that the activated sludge is subjected to concentration regulation, strengthened hydrolysis, slag-liquid separation, washing of filter residue, filtrate concentration and utilization, drying and utilization of a concentrated solution, utilization of the filter residue and moisture recycling to realize comprehensive utilization of the activated sludge. The green treatment technology for the residual activated sludge has simple technological process and equipment and is easy to realize industrial production; the obtained filtrate product has good foamability and stable foam stability; and the obtained filter residue has good application effect when used as a building material.

Description

technical field [0001] The invention relates to the field of post-treatment of activated sludge generated in biochemical treatment of sewage and wastewater and environmental treatment, in particular to a green treatment process for residual activated sludge in urban sewage treatment plants. Background technique [0002] Biochemical method has become the mainstream process of urban sewage and industrial wastewater treatment, and excess activated sludge is the inevitable product of this process. At present, as far as the remaining activated sludge is concerned, it is mainly processed by making fertilizer, incinerating, using as building materials, landfilling, and throwing into the sea, but there are many shortcomings. Chinese patent application 01126637.6 discloses a low-oxygen digestion-membrane separation treatment process for organic sludge. The organic sludge is first separated and then enters pretreatment. The sludge enters hypoxic digestion and membrane separation for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/10C02F11/12
Inventor 刘成林
Owner 天津市裕川置业集团有限公司
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