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Method for improving methane production by anaerobic fermentation of excess sludge

A technology of anaerobic fermentation and excess sludge, applied in biological sludge treatment and other directions, can solve the problems of inability to meet production requirements and low gas production.

Inactive Publication Date: 2020-09-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the traditional residual sludge anaerobic fermentation methane production technology has less gas production and cannot meet the existing production requirements

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  • Method for improving methane production by anaerobic fermentation of excess sludge
  • Method for improving methane production by anaerobic fermentation of excess sludge
  • Method for improving methane production by anaerobic fermentation of excess sludge

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Comparison scheme
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Embodiment 1

[0017] A method for increasing the anaerobic fermentation of excess sludge to produce methane is to mix the excess sludge with the seed sludge at a ratio of 3:1, and add iron sludge to the In the mixed sludge, nitrogen is charged for 10 minutes before fermentation to remove oxygen in the reaction device, and then the temperature is adjusted so that the entire reaction device reacts at about 35°C. A stirring device can be added to the reaction device to speed up the process of methane production, and the rotation speed is 90r min -1 , The frequency is 4 times a day, stirring for 1.5 hours each time, the whole process of methane production lasts about two months to the end of gas production.

Embodiment 2

[0019] Take the remaining sludge as the treatment object, add some iron sludge to the sludge, and check its daily gas production. The remaining sludge came from a sewage treatment plant in Xi'an, the inoculum sludge came from a brewery in Xi'an, and the Fenton iron sludge came from a paper mill in Wugong.

[0020] Component analysis of excess sludge and Fenton iron sludge:

[0021] (1) Component analysis of excess sludge:

[0022] Select certain sludge samples, centrifuge at 5000r / min for 10min, and then filter through a 0.45μm filter membrane to measure relevant physical and chemical indicators, mainly including pH, TS, VS, SCOD, TCOD, polysaccharides and other indicators. Explain the basic content of the remaining sludge, and provide help for subsequent research on methane production.

[0023] Table 1 is the basic components of excess sludge

[0024]

[0025] (2) Analysis of iron slime components:

[0026] Use visible light colorimetry to determine the content of orga...

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Abstract

The invention discloses a method for improving methane production by anaerobic fermentation of excess sludge, and belongs to the technical field of methane production by anaerobic fermentation of excess sludge. The preparation method comprises the steps: mixing excess sludge and inoculated sludge according to a ratio of 3:1; adding iron sludge into the mixed sludge according to the proportion that1 g of the iron sludge is added into each 100 ml of residual sludge; introducing nitrogen for 10 min before fermentation to remove oxygen, adjusting the temperature to make the whole reaction devicereact at 35DEG C, adding a stirring instrument into the reaction device to accelerate the methanogenesis process, and stirring once every 10 min. Compared with independent methane production of the excess sludge, the methane production of the excess sludge reinforced by the iron sludge adopted in the preparation method has the gas production rate improved by 87.9%, and compared with rust addition,the methane production of the excess sludge reinforced by the iron sludge reinforced by the iron sludge reinforced by the iron sludge reinforced by the iron sludge has the gas production rate improved by about 24.1%.

Description

technical field [0001] The invention relates to the technical field of methane production by anaerobic fermentation of excess sludge, in particular to a method for improving methane production by anaerobic fermentation of excess sludge. Background technique [0002] Surplus sludge is the waste produced during the process of biochemical treatment of sewage in sewage treatment plants. The output of surplus sludge is about 0.3%-0.5% of sewage production. With the growth of my country's population and the rapid development of economy, the situation of water pollution Increasingly serious, the continuous increase of sewage plants has become an inevitable measure. The generation and treatment costs of excess sludge are also increasing. The sludge output of my country's sewage plants is large, but most of them have not been effectively stabilized. The problem of secondary pollution is the obvious result of the rapid increase in sludge production. In addition, due to the problem of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04
CPCC02F11/04
Inventor 高俊玲李文涛杨子新魏文霞王辰风孙庆高云鹏
Owner SHAANXI UNIV OF SCI & TECH