Method for promoting sludge to be reduced by ozone

A technology of sludge and ozone, applied in the direction of oxidation treatment of sludge, biological sludge treatment, waste fuel, etc., can solve the problems of slow rate of hydrolysis, low gas production, long residence time of sludge anaerobic digestion, etc., to achieve saving Subsequent treatment costs, increased gas production, and good resource utilization effects

Inactive Publication Date: 2010-05-19
NANJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0004] In the whole process of sludge anaerobic digestion, the rate of hydrolysis process is slow, which is the rate-limiting stage, resulting in the disadvantages of long residence time of sludge anaerobic digestion (generally more than 30 days) and low gas production.

Method used

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  • Method for promoting sludge to be reduced by ozone
  • Method for promoting sludge to be reduced by ozone

Examples

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Effect test

Embodiment 1

[0023] The remaining sludge of a certain urban sewage treatment plant, after being concentrated in the sludge concentration tank 1, has the following properties: the water content is 98.8%, the sludge SS is 12.01g / L, the VSS is 9.272g / L, and the soluble COD is 100.6mg / L. Adjust the pH to 9.03, take 1.2L of sludge and put it into the 2.5L sludge pretreatment reactor 2, the ozone generated by the ozone generator 3 enters the sludge pretreatment reactor 2 from the bottom, and the tail gas is emptied after being treated. The dosage of ozone is 0.3g / gTSS, the soluble COD in the sludge after treatment becomes 4899.5mg / L, the soluble COD increases 49 times, and the sludge SS reduction rate is 41.06%. After ozone pretreatment, the sludge enters the anaerobic digestion reactor 4, and the gas produced by digestion is removed by the gas purification device 5 2 After waiting for impurities, methane gas 6 can be obtained; the anaerobic digestion temperature is 35±1°C, and the inoculum slud...

Embodiment 2

[0025] The remaining sludge of a certain urban sewage treatment plant, after being concentrated in the sludge concentration tank 1, has the following properties: the water content is 98.2%, the sludge SS is 18.53g / L, the VSS is 14.48g / L, and the soluble COD is 110.5mg / L. Adjust the pH to 7.0, take 1.2L of sludge and put it into the 2.5L sludge pretreatment reactor 2, the ozone generated by the ozone generator 3 enters the sludge pretreatment reactor 2 from the bottom, and the tail gas is emptied after being treated. The dosage of ozone is 0.05g / gTSS, the soluble COD in the sludge after treatment becomes 3049.1mg / L, the soluble COD increases 28 times, and the sludge SS reduction rate is 16.1%. After ozone pretreatment, the sludge enters the anaerobic digestion reactor 4, and the gas produced by digestion is removed by the gas purification device 5 2 After waiting for impurities, methane gas 6 can be obtained. The temperature of anaerobic digestion is 25±1°C. The inoculum sludge...

Embodiment 3

[0027] The remaining sludge of a petrochemical sewage treatment plant, after being concentrated in the sludge concentration tank 1, has the following properties: the water content is 99.2%, the sludge SS is 8.218g / L, the VSS is 5.811g / L, and the soluble COD is 49.0mg / L. Adjust the pH to 10.0, take 1.2L of sludge and put it into the 2.5L sludge pretreatment reactor 2, the ozone generated by the ozone generator 3 enters the sludge pretreatment reactor 2 from the bottom, and the tail gas is emptied after being treated. The dosage of ozone is 0.02g / gTSS, the soluble COD in the sludge after treatment becomes 733.1mg / L, the soluble COD increases 15 times, and the sludge SS reduction rate is 8.65%. After ozone pretreatment, the sludge enters the anaerobic digestion reactor 4, and the gas produced by digestion is removed by the gas purification device 5 2 After waiting for impurities, methane gas 6 can be obtained. The anaerobic digestion temperature is 55±1°C. The inoculum sludge is ...

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Abstract

The invention relates to a method for promoting sludge to be reduced by ozone, in particular to a technology used for pretreating the sludge and accelerating anaerobic sludge digestion speed by utilizing ozone oxidation technique, which is widely applied to the sludge treatment technique of a sewage plant. The method comprises: the residual sludge of the sewage plant is concentrated and then treated by a sludge pretreatment reactor; due to the strong oxidizing property of ozone, the cell wall and the cell membrane of microorganism inside the sludge are broken, and a great deal of organic matter is released out of cells; after being treated by the ozone, the sludge enters into an anaerobic digestion reactor, and anaerobic digestion can be carried out in a closed anaerobic state; gas generated by digestion is treated by a gas purifying device, and methane can be obtained; after anaerobic digestion, the sludge is treated by flocculation and dehydration, and dewatering sludge can be obtained; then, final treatment can be carried out, for example, the sludge can be used for manufacturing agricultural fertilizer, bricks, porcelain granules or auxiliary fuel of fire coal; and anaerobic supernate is treated by biological filtering bed technique, so that the organic matter, ammonia and nitrogen in the solution can be removed.

Description

technical field [0001] The present invention relates to a method for promoting sludge reduction by ozone, in particular, it relates to a technique for pretreating sludge by using ozone oxidation technology to accelerate the anaerobic digestion rate of sludge, which can be widely used in sewage plants sludge treatment process. Background technique [0002] At present, more than 90% of the world's urban sewage treatment adopts the activated sludge method, and a large amount of sludge will be generated during the treatment process. Sludge has high moisture content, large volume, and contains harmful substances such as refractory organic matter, heavy metals, and pathogenic bacteria and parasites. At present, the annual output of sludge in my country has reached 26.62 million tons (water content 80%), and it is expected that the annual output of sludge will reach 30 million tons (water content 80%) in 2010. With the development of economy and society, the country pays more and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/06C02F11/04
CPCY02E50/343Y02E50/30
Inventor 沈树宝陈英文刘明庆祝社民
Owner NANJING UNIV OF TECH
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