Thermal hydrolysis anaerobic digestion sludge dewatering method

A technology of anaerobic digestion and thermal hydrolysis, applied in pyrolysis treatment of sludge, water/sludge/sewage treatment, chemical instruments and methods, etc. The problems of large dosage and large dosage of pharmaceuticals can achieve the effect of facilitating subsequent disposal and utilization, avoiding large dosage of pharmaceuticals and small increase in dosage.

Inactive Publication Date: 2019-02-19
北京尚水清源水处理技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention proposes a thermal hydrolysis anaerobic digested sludge dehydration method with a small amount of medicament dosage and basically no change in the pH value of the sludge, which solves the problem of thermal hydrolysis anaerobic digested sludge in the prior art. During sludge dehydration, the dosage of chemicals is large, a large number of air bubbles are generated in the feed, the pH of the sludge filtrate changes greatly, and technical problems affecting the subsequent treatment and disposal of the filtrate and mud cake

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] For the dehydration of thermally hydrolyzed anaerobic digested sludge from the anaerobic digester of the sewage treatment plant, the compound conditioning method of inorganic coagulant and organic flocculant is used to improve the sludge dewatering performance. During the dehydration process, the inorganic coagulant The dosage is 0.5% of the sludge volume; the dosage of the organic flocculant is 2.0% of the sludge volume; the inorganic coagulant is polythirteen aluminum, namely Al 12 AlO 4 (OH 24 ) 7+ , the organic flocculant is polydimethyldiallylammonium chloride;

[0035] This example includes the following steps:

[0036] S1. Take an appropriate amount of thermally hydrolyzed anaerobic digested sludge in the reactor, start stirring, and stir at a frequency of 40HZ for 10 minutes. The moisture content of the raw sludge is measured to be 94.5%, and the pH of the raw sludge is 7.53;

[0037] S2. Measure corresponding amounts of inorganic coagulants and organic floc...

example 2

[0045] Aiming at the dehydration of thermally hydrolyzed anaerobic digested sludge from the anaerobic digester of sewage treatment plant, the scheme adopts the compound conditioning method of inorganic coagulant and organic flocculant to improve the dewatering performance of sludge. During the dehydration process, inorganic coagulation The dosage of the agent is 1.0% of the sludge volume; the dosage of the organic flocculant is 2.2% of the sludge volume, and the inorganic coagulant is polythirteen aluminum, that is, Al 12 AlO 4 (OH 24 ) 7+ , the organic flocculant is polydimethyldiallylammonium chloride;

[0046] This example includes the following steps:

[0047] S1. Take an appropriate amount of thermally hydrolyzed anaerobic digested sludge in the reactor, start stirring, and stir at a frequency of 45HZ for 10 minutes. The measured moisture content of the raw sludge is 94.1%, and the pH of the raw sludge is 7.65;

[0048] S2. Take the corresponding amount of inorganic c...

example 3

[0056] Aiming at the dehydration of thermally hydrolyzed anaerobic digested sludge from the anaerobic digester of sewage treatment plant, the scheme adopts the compound conditioning method of inorganic coagulant and organic flocculant to improve the dewatering performance of sludge. During the dehydration process, inorganic coagulation The dosage of the agent is 1.2% of the sludge volume; the dosage of the organic flocculant is 2.4% of the sludge volume, and the inorganic coagulant is polythirteen aluminum, that is, Al 12 AlO 4 (OH 24 ) 7+ , the organic flocculant is polydimethyldiallylammonium chloride;

[0057] This example includes the following steps:

[0058] S1. Take an appropriate amount of thermally hydrolyzed anaerobic digested sludge in the reactor, start stirring, and stir at a frequency of 45HZ for 15 minutes. The moisture content of the raw sludge is measured to be 93.7%, and the pH of the raw sludge is 7.79;

[0059] S2. Take the corresponding amount of inorg...

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Abstract

The invention discloses a thermal hydrolysis anaerobic digestion sludge dewatering method, which comprises the following steps: firstly, thermal hydrolysis anaerobic digestion sludge is conditioned byusing the combination of a specific inorganic coagulant and an organic flocculant, and the sludge is stirred at different frequencies and for different time periods by an agitator. Physical dewatering is carried out on the conditioned sludge, the water content of sludge cake made of dewatered sludge is reduced from 93-95% to below 60%, and the deep dewatering of the thermal hydrolysis anaerobic digestion sludge is achieved, which facilitates subsequent disposal and utilization. The method has low dosage of medicament and a simple conditioning process, the basicity degrees and PH values of thesludge before and after conditioning are consistent, dry solid is increased little, no odor is produced in the production process, and the problem that the dosage of traditional conditioning method is too large and the alkalinity consumption is high is solved. The method does not affect the subsequent resource-based disposal of mud cakes and anaerobic ammonia oxidation treatment of the filtrate.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a method for dewatering thermal hydrolysis anaerobic digestion sludge. Background technique [0002] With the continuous improvement of my country's urbanization level and the rapid development of sewage treatment facilities, the amount of sludge treatment has increased dramatically. After sewage treatment, a large number of pollutants are enriched, concentrated, and transferred to the sludge, and the special morphological structure and high hydrophilicity of the sludge make it difficult to remove a large amount of water, resulting in a huge volume of sludge, which seriously affects Its reduction, stabilization and harmlessness, and comprehensive utilization of resources. In order to facilitate the subsequent transportation and disposal of sludge, sludge is generally dehydrated. As an efficient sludge dehydration and volume reduction technology, deep sludge dehydration is widely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/10C02F11/04C02F11/143C02F11/122
CPCC02F11/04C02F11/10C02F11/122C02F11/14C02F2209/06
Inventor 虞红波刘锟刘昕苏航杨晓胤
Owner 北京尚水清源水处理技术有限公司
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