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Method for deep reduction of remaining active sludge

A technology of residual activity and sludge, which is applied in biological sludge treatment, pyrolysis sludge treatment, sludge treatment through temperature control, etc. It can reduce the amount of excess activated sludge and the treatment cost, and overcome the complicated sludge cracking process and low treatment cost.

Inactive Publication Date: 2018-01-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the defects existing in the prior art, the object of the present invention is to provide a method for reducing the depth of excess activated sludge, which overcomes the complex sludge cracking process, high energy consumption and large amount of chemical agents in the prior art, and the sludge is disgusting. Poor oxygen digestion stability and other problems

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  • Method for deep reduction of remaining active sludge

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Effect test

Embodiment 1

[0053] The characteristics of the remaining activated sludge to be treated: 10kg of sludge in the sludge thickening tank of a sewage treatment plant biochemical treatment process, the sludge index is: the concentration of mixed suspended solids (MLSS) is 28.7g / L, the concentration of volatile suspended solids in the mixed solution (MLVSS) is 22.4g / L.

[0054] The above-mentioned residual activated sludge to be treated is processed according to the following steps:

[0055] (1) The remaining activated sludge 1 to be treated is first sent to the heat exchanger 2 to be preheated to a certain temperature, and then sent to the heater 3 to be heated to 75° C. to obtain the heated remaining activated sludge;

[0056](2) Pump the remaining activated sludge after heating into the low-temperature thermal hydrolysis reaction kettle 4, heat and keep it warm with steam; the temperature of the low-temperature thermal hydrolysis reaction kettle 4 is 75° C., and the low-temperature thermal hy...

Embodiment 2

[0071] The characteristics of the remaining activated sludge to be treated: 10kg of sludge in the sludge thickening tank of a sewage treatment plant biochemical treatment process, the sludge index is: the concentration of mixed suspended solids (MLSS) is 28.7g / L, the concentration of volatile suspended solids in the mixed solution (MLVSS) is 22.4g / L.

[0072] The above-mentioned remaining activated sludge to be treated is processed according to the following steps:

[0073] (1) The remaining activated sludge 1 to be treated is first sent to the heat exchanger 2 to be preheated to a certain temperature, and then sent to the heater 3 to be heated to 95° C. to obtain the heated remaining activated sludge;

[0074] (2) Pump the remaining activated sludge after heating into the low-temperature thermal hydrolysis reaction kettle 4, heat and keep it warm with steam; the temperature of the low-temperature thermal hydrolysis reaction kettle 4 is 95° C., and the low-temperature thermal ...

Embodiment 3

[0089] The characteristics of the remaining activated sludge to be treated: 10kg of sludge in the sludge thickening tank of a sewage treatment plant biochemical treatment process, the sludge index is: the concentration of mixed suspended solids (MLSS) is 28.7g / L, the concentration of volatile suspended solids in the mixed solution (MLVSS) is 22.4g / L.

[0090] The above-mentioned remaining activated sludge to be treated is processed according to the following steps:

[0091] (1) The remaining activated sludge 1 to be treated is first sent to the heat exchanger 2 to be preheated to a certain temperature, and then sent to the heater 3 to be heated to 90° C. to obtain the heated remaining activated sludge;

[0092] (2) Pump the remaining activated sludge after heating into the low-temperature thermal hydrolysis reactor 4, heat and keep it warm with steam; the temperature of the low-temperature thermal hydrolysis reactor 4 is 90° C., and the low-temperature thermal hydrolysis react...

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Abstract

The present invention relates to a method for deep reduction of remaining active sludge. The method comprises: 1, heating remaining active sludge to be treated, and carrying out a low temperature thermal hydrolysis reaction; 2, carrying out a facultative digestion reaction on the remaining active sludge treated in the step 1; and 3, dewatering the remaining active sludge treated in the step 2 to obtain the dewatered sludge. According to the present invention, the degradation and the reduction of the remaining active sludge are prompted by using the low temperature thermal hydrolysis technologyand facultative digestion combined process, such that the reduction effect is good, the treatment cost is low, the technology is mature and reliable, the process is simple, the water content and theorganic component in the remaining active sludge can be effectively reduced, the amount of the remaining active sludge and the treatment cost can be substantially reduced, and the good economic and application value can be provided.

Description

technical field [0001] The invention relates to the technical field of solid waste treatment, in particular to a method for deep reduction of excess activated sludge. In particular, it refers to the method of promoting the depth reduction of excess activated sludge by using the combined process of sludge cracking and sludge digestion. Background technique [0002] Activated sludge method is currently the most widely used sewage treatment method. It utilizes the biological coagulation, adsorption and oxidation of activated sludge to decompose and remove organic pollutants in sewage. It has the significant advantages of low treatment cost and high efficiency. However, in the process of sewage treatment by activated sludge method, a large amount of excess activated sludge will also be produced at the same time. Excess activated sludge is an extremely complex heterogeneous sludge composed of organic matter fragments, bacterial cells, inorganic particles and colloids. body. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/10C02F11/02C02F11/12C02F11/14C02F11/18
CPCY02W10/40
Inventor 魏令勇李昕阳邱松杨芳芳侯秀华
Owner CHINA PETROLEUM & CHEM CORP
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