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Alkaline thermal hydrolysis treatment method and system for sludge

A treatment system and treatment method technology, applied in the field of sludge alkaline thermal hydrolysis treatment method and system, to achieve the effect of maximizing resource utilization

Pending Publication Date: 2018-06-22
山西晋联环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the usual sludge treatment and disposal process fails to effectively maximize resource utilization

Method used

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  • Alkaline thermal hydrolysis treatment method and system for sludge
  • Alkaline thermal hydrolysis treatment method and system for sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A sludge alkaline thermal hydrolysis treatment method is characterized in that it comprises the following steps:

[0026] (1) Sludge blending and preheating, put the sludge (collected from Shanxi Sewage Treatment Co., Ltd.) and hydrolysis agent into the sludge blending and preheating device, adjust the sludge to a moisture content of 86%, and a temperature of 70°C, then hydrolyze The agent is quicklime, and the proportion of quicklime added is 20% of the dry weight of the sludge;

[0027] (2) Sludge hydrolysis reaction, the prepared and preheated sludge is transported to the hydrolysis reaction device, heated to 123°C, and stayed for 3 hours to complete the hydrolysis reaction process;

[0028] (3) Sludge flash evaporation, the sludge that has completed the hydrolysis reaction is transported to the flash tank for flash evaporation for 0.5 hours;

[0029] (3) Sludge solid-liquid separation. After the sludge hydrolysis reaction, the solid-liquid separation is carried out...

Embodiment 2

[0037] The difference between the method of Example 2 and the method of Example 1 is that the addition ratio of quicklime is 22.5% of the dry weight of the sludge, the deployment preheating temperature is 90°C, the thermal hydrolysis reaction temperature is 120°C, and a constant temperature of 120°C is maintained for 2 Hour.

[0038] The nutritional components and properties of the residue obtained in step (3) were analyzed. The water content was 38.2%, the pH value was 9.8, the calcium content was 11.3%, the organic matter content was 32.5%, the crude protein content was 10.3%, and the overall nutrient content was 7.73%, which met the requirements of the standard.

[0039] The filtrate obtained in step (3) was subjected to a pot test, in which the green vegetables in group A averaged 236.5g each, which was 71% higher than the 138.3g growth rate in group B, and the cherry radishes in group C averaged 16.8g each. Compared with the 10.3g growth rate of group D, the growth rate h...

Embodiment 3

[0041] The difference between the method of Example 3 and the method of Example 1 is that the addition ratio of quicklime is 18% of the dry weight of the sludge, the deployment preheating temperature is 80°C, the thermal hydrolysis reaction temperature is 125°C, and the constant temperature of 125°C is kept at 2.5°C. Hour.

[0042] The nutritional components and properties of the residue obtained in step (3) were analyzed. The water content was 39.0%, the pH value was 8.6, the calcium content was 9.4%, the organic matter content was 30.9%, the crude protein content was 9.8%, and the overall nutrient content was 7.52%, which met the requirements of the standard.

[0043] The filtrate obtained in step (3) was subjected to a pot test, in which the green vegetables in group A averaged 211.6g each, which was 72% higher than the 123g growth rate in group B, and the cherry radishes in group C averaged 16.5g each. Compared with the 11g growth rate of group D, it increased by 59.1%.

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Abstract

The invention provides an alkaline thermal hydrolysis treatment method for sludge, which can solve the technical problem that common sludge treatment processes cannot effectively realize the maximum resource utilization. The alkaline thermal hydrolysis treatment method for the sludge is characterized by comprising following steps: (1) sludge blending and preheating: the sludge and a hydrolysis agent are added to a sludge blending and preheating device, the sludge is blended until the water content is 86%-90% and the temperature is 70-90 DEG C, wherein the hydrolysis agent is quick lime, and the adding proportion of the quick lime is 18%-25% of the dry weight of the sludge; (2) a sludge hydrolysis reaction: the blended and preheated sludge is conveyed to a hydrolysis reaction device, heatedto 120 DEG C and kept for 2-3 h, and the hydrolysis reaction process is completed; (3) flash evaporation of the sludge: the sludge completing the hydrolysis reaction is conveyed into a flash evaporation tank for flash evaporation for 0.5 h; (4) solid-liquid separation of the sludge: solid-liquid separation is performed through a solid-liquid separation device after the sludge hydrolysis reaction,obtained filtrate is a protein stock solution which is stored in a stock solution tank, and obtained residues are directly sent into a recycling product production device.

Description

technical field [0001] The invention relates to the technical field of sludge treatment and disposal, in particular to a sludge alkaline thermal hydrolysis treatment method and system. Background technique [0002] With the continuous increase of urban sewage and industrial wastewater, according to the statistics of the Ministry of Housing and Urban-Rural Development, as of the end of September 2013, a total of 3,501 urban sewage treatment plants have been built nationwide, and the urban sewage treatment volume has reached more than 30 billion cubic meters. The construction and operation of the sewage plant will produce a large amount of excess sludge. Based on the moisture content of 80%, the total annual sludge output in the country will exceed 30 million tons, and this figure will continue to rise. The situation of sludge treatment is very severe. [0003] The usual sludge treatment and disposal method is: After the sewage plant sludge is press-filtered, its water content...

Claims

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Application Information

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IPC IPC(8): C02F11/10C02F11/12C02F11/18C02F11/00C05F7/00C05G3/04C09K17/40C05G3/80
CPCC09K17/40C02F11/00C02F11/10C02F11/12C02F11/122C02F11/18C05F7/00C02F2303/06C05G3/80Y02A40/20
Inventor 李雄伟朱葛范明阳
Owner 山西晋联环境科技有限公司
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