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Municipal sludge pretreatment method enhancing sludge anaerobic fermentation acid production

A technology of sludge anaerobic fermentation and municipal sludge, applied in water/sludge/sewage treatment, sludge treatment, biological sludge treatment, etc. and other problems, to achieve the effect of high efficiency and mild reaction conditions

Active Publication Date: 2013-12-18
南京特克赛环保科技有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003]At present, the research on enzymatic pretreatment of sludge at home and abroad mainly focuses on thermophilic enzymes, cellulase and alkaline protease, etc., and the effects are not very good Ideal, mainly because thermophilic enzymes and alkaline cellulase require alkaline conditions and higher temperatures to exert their maximum enzyme activity
At the same time, the composition of organic matter in the sludge will also affect the treatment effect of the above enzymes. The organic matter in the sludge is mainly carbohydrates such as protein and polysaccharides, and the protein content can usually reach about 70% (Wen-rong Hu et al, 2010) , so the effect of enzyme preparations such as cellulase is very limited

Method used

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  • Municipal sludge pretreatment method enhancing sludge anaerobic fermentation acid production
  • Municipal sludge pretreatment method enhancing sludge anaerobic fermentation acid production
  • Municipal sludge pretreatment method enhancing sludge anaerobic fermentation acid production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1, the influence of protease concentration and enzymolysis time on sludge pretreatment effect

[0020] The sludge was taken from the dewatered sludge of the secondary settling tank of Wuxi Lucun Sewage Treatment Plant. and 20mg / gTS, reacted for 2.0h under the stirring condition with a rotation speed of 120r / min, and took samples at the reaction time points of 0.5, 1.0, 1.5 and 2.0h respectively, and measured the SCOD of the water samples. The results showed that when the concentration of neutral protease was 20mg / gTS and the stirring time was 1.0h, the SCOD in the sludge supernatant could reach 1118.8mg / L, which was 1.8 times higher than that of the pretreated sludge solution.

Embodiment 2

[0021] The influence of embodiment 2, temperature and EDTA-2Na salt concentration on sludge pretreatment

[0022] The source of sludge and other experimental conditions were the same as Example 1, and the enzyme concentration and stirring time were fixed at 20mg / gTS and 1.0h respectively, and the concentration of EDTA-2Na was set at five levels: 0, 0.05, 0.1, 02 and 0.4g / gTS, Each level was stirred for 1.0 h at temperatures of 35, 45, 55 and 65°C, respectively. The results show that when the concentration of EDTA-2Na is 0.2g / gTS and the temperature is 55℃, the concentration of SCOD in the sludge can reach 8470.0mg / L, the concentration of polysaccharide can reach 2695.1mg / L, and the concentration of protein can reach 156.7mg / L The pretreatment sludge solution increased by 20.0, 12.5 and 2.1 times respectively.

Embodiment 3

[0023] Embodiment 3, the influence of pH on sludge pretreatment effect

[0024] The source of sludge and other experimental conditions are the same as Example 1. The set temperature is 55°C, the concentration of EDTA-2Na salt is 0.2g / gTS, the concentration of enzyme is 20mg / gTS, and the stirring time is 1h. At different initial pH (4.0, 5.0 , 6.0, 7.0, 8.0) to pretreat sludge. The results showed that when the initial pH was 7.0, the concentration of SCOD in the sludge reached 8621.32mg / L, which was 20.4 times higher than that of the untreated sludge solution.

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Abstract

The invention discloses a municipal sludge pretreatment method enhancing sludge anaerobic fermentation acid production. The method enables sludge cells to rupture, enables organic matter to be released and converted in a superior-quality mode to the most extent and remarkably increases the quantity of organic acid produced through follow-up anaerobic fermentation by jointly inputting neutral protease and ethylene diamine tetraacetic acid disodium salt (EDTA-2Na) and adjusting potential of hydrogen (pH) and reaction temperature. Test results show that by means of the municipal sludge pretreatment method, the concentration of soluble chemical oxygen demand (SCOD) in sludge is improved by 18.0-20.0 times, the concentration of polysaccharide is improved by 11.0-13.0 times, and the concentration of protein is improved by 1.5-2.5 times. The municipal sludge pretreatment method has the advantages of being moderate in reaction condition, high in efficiency, high in sludge quantity reducing degree and the like. A new method and idea is provided for the purpose of finally achieving recycling, reduction and harmlessness of excess sludge.

Description

technical field [0001] The invention relates to an urban sludge pretreatment method for improving the output of organic acids in sludge anaerobic fermentation, and belongs to the field of sludge treatment. Background technique [0002] my country's annual dry sludge production is about 9 million tons, accounting for about 0.3% of the total waste, and increasing at a rate of more than 10% per year, while the cost of sludge treatment and disposal accounts for about 50-60% of sewage treatment, so cities The proper disposal of sludge is imminent. Anaerobic fermentation of sludge to produce acid is a good solution, but since most of the organic matter in the sludge is microbial cells, which are wrapped by cell walls, the dissolution of organic matter in the sludge cells and its high-quality transformation have become restrictions on sludge annoyance. The key steps of oxygen fermentation acid production. There have been reports on sludge pretreatment methods at home and abroad, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/04
Inventor 刘和祖叶品刘宏波符波
Owner 南京特克赛环保科技有限公司
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