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Method for accelerating anaerobic fermentation of residual sludge by utilizing zero-valent iron technology

A technology for anaerobic fermentation and excess sludge, which is applied in biological sludge treatment, waste fuel, etc., can solve problems such as instability and difficulty in obtaining and operating materials, and achieve reduction in volume, increase in methane production, and low investment costs Effect

Active Publication Date: 2013-09-11
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are also problems such as difficult access to materials or unstable operation.
In recent years, foreign lipo tank anaerobic technology has begun to be applied in China, but there is still a large room for performance improvement when dealing with sludge with high solid content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take high-solid sludge with a solid content rate of less than 10% to be fermented, take iron filings (flaky) and add 10g per Kg of high-solid sludge, then inoculate anaerobic microorganisms and stir evenly, and mix the sludge Add in the anaerobic fermentation reactor, and seal the reactor well. The reactor was stirred by an electric stirrer at a stirring speed of 70 rpm, and anaerobic fermentation was carried out for 20 days under the stirring state, the pH value was controlled at 7, and the fermentation temperature was 37°C. After the fermentation of high-solid sludge per Kg, 15.4L of methane gas can be produced. The volume of high solid sludge was reduced by 29.5%.

Embodiment 2

[0021] Take high-solid sludge with a solid content rate of less than 10% to be fermented, take iron filings (flaky) and add 5g per Kg of high-solid sludge, then inoculate anaerobic microorganisms and stir evenly, and mix the sludge Add in the anaerobic fermentation reactor, and seal the reactor well. The reactor was stirred by an electric stirrer at a stirring speed of 70 rpm, and anaerobic fermentation was carried out for 20 days under the stirring state, the pH value was controlled at 7, and the fermentation temperature was 37°C. After the fermentation of high-solid sludge per Kg, 14.2L of methane gas can be produced. The volume of high-solid sludge was reduced by 27.1%.

Embodiment 3

[0023] Take high-solid sludge with a solid content rate of less than 10% to be fermented, take iron filings (flaky) and add 10g per Kg of high-solid sludge, then inoculate anaerobic microorganisms and stir evenly, and mix the sludge Add in the anaerobic fermentation reactor, and seal the reactor well. The reactor was stirred by an electric stirrer at a stirring speed of 70 rpm, and anaerobic fermentation was carried out for 20 days under stirring, the pH value was controlled at 7, and the fermentation temperature was 25°C. After the fermentation of high-solid sludge per Kg, 12.4L of methane gas can be produced. The volume of high solid sludge was reduced by 24.5%.

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Abstract

A method for accelerating anaerobic fermentation of residual sludge by utilizing a zero-valent iron technology comprises the following steps: mixing a high solid sludge with a solid ratio of less than 10% and iron scraps, putting the mixture into an anaerobic fermentation reactor, and inoculating with anaerobic microorganisms; undergoing the anaerobic fermentation in the reactor with stirring, and collecting methane generated during the fermentation process; having requirements of the stirring speed, the pH value in the reactor, the temperature control during the stirring process; after finishing fermentation, discharging the sludge, wherein the residual iron scraps remaining in the anaerobic fermentation reactor are used for next batch of the sludge fermentation. With the method for accelerating the anaerobic fermentation of the residual sludge by utilizing the zero-valent iron technology, the following technical effects are achieved: reduction of the high solid sludge is promoted after the anaerobic fermentation, and at the same time, the methane generation amount during the fermentation process is improved. The method has low investment cost, simple technical operation, and strong processing ability, and can be applied to upgrade reconstruction of new built sludge anaerobic fermentation equipment or existing equipment.

Description

technical field [0001] The invention relates to a method for sludge anaerobic fermentation. Background technique [0002] High-solid sludge is solid waste generated during the operation of sewage treatment plants. It generally refers to the sludge in the secondary sedimentation tank that has undergone chemical coagulation and mechanical pressure filtration, and its moisture content is 80-90%. At present, the sludge discharged from urban sewage treatment plants is basically high-solid sludge after pressure filtration. As of 2012, 2,163 urban sewage treatment plants have been built nationwide, with a daily treatment capacity of 14.26 million tons. This number will increase significantly in the next two decades. Such a high sewage treatment capacity will inevitably lead to high solids. With the increase of urban sludge, it is estimated that the current annual output of high-solid sludge in the country is about 60 million tons. At present, the treatment and disposal technology...

Claims

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Application Information

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IPC IPC(8): C02F11/04
CPCY02E50/30
Inventor 张耀斌冯应鸿全燮陈硕
Owner DALIAN UNIV OF TECH
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