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Method for producing methane through jointly opsonizing sludge by microwave and heat to improve anaerobic fermentation of low organic sludge

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

Active Publication Date: 2013-12-04
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 anaerobic stabilization process to treat and dispose of it, the purpose of this invention is to provide a combination of microwave and heat conditioning sludge to improve the low organic matter Method for producing biogas by anaerobic fermentation of sludge

Method used

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  • Method for producing methane through jointly opsonizing sludge by microwave and heat to improve anaerobic fermentation of low organic sludge

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Effect test

Embodiment 1

[0024] figure 1 A flow chart showing the method for improving the anaerobic fermentation of low-organic-matter sludge to produce biogas by combining microwave and heat conditioning sludge according to the present invention.

[0025] Take dewatered sludge (water content 78.91%) and thickened sludge (water content 96.17%) from a sewage treatment plant in a certain place to make mixed sludge with water content 90.0% in the sludge blending tank. At this time, its volatile Organic solids accounted for 32.5% of the total solids. Then put the above sludge into the microwave irradiation device, the microwave frequency is 2450MHz, under the condition of 1000W, it is irradiated by microwave for 1min, and then put into the heating pretreatment device, and heated at 120°C for 30min. Take 1L of the above-mentioned sludge that has been processed and put it into a fermenter with an effective volume of 20L (the sludge residence time is 20d), and discharge 1L into the sludge collection tank. ...

Embodiment 2

[0030] Take dewatered sludge (water content 79.11%) and thickened sludge (water content 97.62%) from a sewage treatment plant in a certain place to make mixed sludge with water content 85.0% in the sludge blending tank. At this time, its volatile The proportion of organic solids to total solids was 20.0%. Then put the above sludge into the microwave irradiation device, the microwave frequency is 2450MHz, microwave irradiation under the condition of 600W for 10min, then put into the heating pretreatment device, and heat at 90°C for 60min. Take 1L of the above-mentioned sludge that has been processed and put it into a fermenter with an effective volume of 25L (the sludge residence time is 25d), and discharge 1L into the sludge collection tank. The gas is collected through the digester every day, and the temperature is controlled at 35±2°C, the pH is automatically adjusted to 7.5±0.5, and the speed is controlled at 150rpm. After 2 to 3 cycles of continuous operation (ie 50 to 75...

Embodiment 3

[0035] Take dewatered sludge (water content 78.11%) and thickened sludge (water content 98.35%) from a sewage treatment plant in a certain place to make mixed sludge with water content 95.0% in the sludge blending tank. At this time, its volatile The proportion of organic solids to total solids was 45.0%. Then put the above sludge into the microwave irradiation device, the microwave frequency is 2450MHz, under the condition of 100W, it is irradiated by microwave for 20min, and then put into the thermal pretreatment device, and heated at 170℃ for 10min. Take 1L of the above-mentioned sludge that has been processed and put it into a 30L effective volume fermenter (sludge residence time is 30d), and discharge 1L into the sludge collection tank. The gas is collected through the biogas digester every day, and the temperature is controlled at 55±2°C, the pH is automatically adjusted to 7.5±0.5, and the speed is controlled at 50rpm. After 2 to 3 cycles of continuous operation (ie 50...

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Abstract

The invention belongs to the technical field of the recycling of solid wastes and discloses a method for producing methane through jointly opsonizing sludge by microwave and heat to improve anaerobic fermentation of low organic sludge. The method comprises the following steps that: preparing concentrated sludge and dewatered sludge into mixed sludge, preprocessing the mixed sludge, taking the mixed sludge as a feeding material to conduct anaerobic fermentation, discharging sludge with the same volume, and collecting methane. According to the method, the anaerobic starting time of the low organic sludge is shortened, the total gas output rate caused by the anaerobic fermentation of the low organic sludge is increased, and the recycling utilization of the low organic sludge is promoted.

Description

technical field [0001] The invention belongs to the technical field of solid waste recycling, and relates to a method for combining microwave and heat conditioning sludge to improve anaerobic fermentation of low-organic-matter sludge to produce biogas. 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 the reduction of urban pollution load, the amount of urban sludge, a by-product of the sewage treatment process, is also increasing day by day. At present, the annual production of wet sludge in the country is nearly 30 million tons (water content 80%), and the center of sludge treatment and disposal has shifted from simple landfill to resource-based land use. Before the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/04
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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