Method for improving methane yield through anaerobic fermentation of low organic matter sludge by pretreatment

A sludge anaerobic fermentation and pretreatment technology, applied in the field of solid waste recycling, can solve the problems of difficult anaerobic stable process treatment and disposal, difficulty in starting low-organic sludge, unstable gas production, etc. The effect of gas production rate, promotion of resource utilization of low organic matter sludge, and shortening of sludge residence time

Inactive Publication Date: 2012-07-25
TONGJI UNIV
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Problems solved by technology

[0005] Aiming at the defects that low organic matter sludge is difficult to start, the gas production is small, and the gas production is unstable, and it is difficult to apply the anaerobic stabilization process to treat and dispose of it, the purpose of the present invention is to provide a pretreatment method to improve the anaerobic fermentation of low organic matter sludge. Methods of producing biogas

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  • Method for improving methane yield through anaerobic fermentation of low organic matter sludge by pretreatment
  • Method for improving methane yield through anaerobic fermentation of low organic matter sludge by pretreatment
  • Method for improving methane yield through anaerobic fermentation of low organic matter sludge by pretreatment

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Embodiment 1

[0027] figure 1 It shows the flow chart of the method for improving biogas production by anaerobic fermentation of low-organic sludge by alkaline hydrolysis pretreatment of the present invention.

[0028] Take the dewatered sludge (water content of 78.91%) and concentrated sludge (water content of 96.17%) from a sewage treatment plant in a certain area to form a mixed sludge with a water content of 90.0% in the sludge mixing tank. The organic solids accounted for 32.5% of the total solids. Then put the above-mentioned sludge into the alkali regulating tank, add sodium hydroxide under the stirring condition of 120rpm, the dosage of sodium hydroxide is 0.05g / gVS, after stirring, let it stand in the standing tank for 24h, and then add hydrochloric acid Adjust the pH to 7.5±0.5. Take 1L of the treated sludge and put it into a 20L fermenter with an effective volume (the sludge retention time is 20d), and discharge 1L to the sludge collection tank. Collect gas through the biogas dige...

Embodiment 2

[0033] Take the dewatered sludge (water content of 79.11%) and concentrated sludge (water content of 97.62%) from a sewage treatment plant in a certain area to form a mixed sludge with a water content of 85.0% in the sludge mixing tank. The ratio of organic solids to total solids was 20.0%. Then put the above-mentioned sludge into the alkali adjustment tank, add calcium oxide under the condition of stirring at 120rpm, the dosage of calcium oxide is 0.10g / gVS, after stirring, let it stand in the standing tank for 12h, and then add hydrochloric acid to adjust the pH To 7.5±0.5. Take 1L of the above-mentioned processed sludge and put it into a 25L effective volume fermentation tank (the sludge retention time is 25d), and discharge 1L to the sludge collecting tank. Collect gas through the biogas digester every day, and control the temperature to 35±2℃, automatically adjust the pH to 7.5±0.5, and control the speed to 150rpm. After continuous operation for 2 to 3 cycles (that is, 5...

Embodiment 3

[0038] Take the dewatered sludge (water content of 78.11%) and concentrated sludge (water content of 98.35%) from a sewage treatment plant in a certain area to form a mixed sludge with a water content of 95.0% in the sludge mixing tank. The ratio of organic solids to total solids was 45.0%. Then put the above-mentioned sludge into the alkali regulating tank, add calcium hydroxide under the stirring condition of 120rpm, the dosage of calcium hydroxide is 0.15g / gVS, after stirring, let it stand in the standing tank for 18h, and then add hydrochloric acid Adjust the pH to 7.5±0.5. Take 1L of the above-mentioned processed sludge and put it into a 30L effective volume fermentation tank (the sludge retention time is 30d), and discharge 1L to the sludge collecting tank. Collect gas through the biogas digester every day, and control the temperature to 55±2℃, automatically adjust the pH to 7.5±0.5, and control the speed to 50rpm. After continuous operation for 2 to 3 cycles (that is, ...

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Abstract

The invention belongs to the technical field of solid waste reclamation, and discloses a method for improving methane yield through anaerobic fermentation of low organic matter sludge by pretreatment. The method comprises the following steps of: preparing concentrated sludge and dewatered sludge into mixed sludge for pretreatment; carrying out anaerobic fermentation on the mixed sludge as a feedstock and discharging sludge the volume of which is the same as that of the mixed sludge; and collecting methane. By using the method, the efficiency of producing methane by anaerobic fermentation of the low organic matter sludge is improved, methane production quantity is stable, the energy consumption is low, the application is convenient, and further, and the sludge reclamation is further promoted; the anaerobic starting time of the low organic matter sludge is shortened, the total quantity of methane produced by anaerobic digestion of the low organic matter sludge is increased, and the reclamation utilization of the low organic matter sludge is promoted.

Description

Technical field [0001] The invention belongs to the technical field of solid waste resource utilization, and relates to a method for pretreatment to improve biogas production by anaerobic fermentation of low-organic sludge. Background technique [0002] my country has built a large number of sewage treatment plants. As of 2009, there were 1,792 urban sewage treatment plants nationwide, with a treatment capacity of 99.04 million m3 / d, and an average operating load rate of 81.27%. While the construction and operation of these sewage treatment plants have played an important role in reducing the urban pollution load, the amount of by-product urban sludge in the sewage treatment process is also increasing. At present, the country's annual production of wet sludge has reached nearly 30 million tons (with a moisture content of 80%), and the center of sludge treatment and disposal has shifted from simple landfill to resource-based land use. Before the sludge is used for land use, the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04
CPCY02E50/343Y02E50/30
Inventor 严媛媛陈汉龙冯雷雨戴晓虎周琪
Owner TONGJI UNIV
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