Anaerobic fermentation hydrogen production method using excess sludge as raw material, and additive

An anaerobic fermentation and residual sludge technology, applied in fermentation, sludge treatment, biological sludge treatment, etc., can solve problems such as increased energy consumption and complex process flow, and achieve simple overall process, reduce environmental pollution, and alleviate energy consumption. effect of shortage

Inactive Publication Date: 2020-08-11
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution uses low-temperature thermal pretreatment combined with free ammonia treatment to promote hydrogen production, which is equivalent to adding an additional low-temperature pretreatment process, making the overall process more complex and increasing energy consumption

Method used

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  • Anaerobic fermentation hydrogen production method using excess sludge as raw material, and additive
  • Anaerobic fermentation hydrogen production method using excess sludge as raw material, and additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) In a plexiglass reactor with a working volume of 1 L, the excess sludge produced by the municipal sewage treatment plant was placed at 3°C ​​for natural settlement for 24 hours, and the fermented raw material (i.e., the excess sludge sample) was obtained after the supernatant was drained. , the following examples are the same).

[0032] (2) Add ferrate of 0.05g / g TSS to the reactor, fill the reactor with nitrogen for 10 minutes to exclude oxygen, seal the reactor and put it in a shaker for anaerobic fermentation. Through the combined action of microorganisms in the sludge and ferrate, the organic matter in the sludge is converted into hydrogen. Among them, the fermentation temperature of the reactor is controlled at 25±1°C, the stirring speed of the shaker is 120rpm / min, the residence time of the sludge in the reactor is 3d, and the output of hydrogen produced is 4.03mL / g VSS.

Embodiment 2

[0034] (1) In a plexiglass reactor with a working volume of 1 L, the excess sludge produced by the urban sewage treatment plant was placed at 5°C for 48 hours to naturally settle, and the fermented raw material (i.e., the excess sludge sample) was obtained after the supernatant was drained. , the following examples are the same).

[0035] (2) Add ferrate of 0.07g / g TSS to the reactor, fill the reactor with nitrogen for 10 minutes to exclude oxygen, seal the reactor and put it in a shaker for anaerobic fermentation. Through the combined action of microorganisms in the sludge and ferrate, the organic matter in the sludge is converted into hydrogen. Among them, the fermentation temperature of the reactor is controlled at 37±1°C, the stirring speed of the shaker is 180rpm / min, the residence time of the sludge in the reactor is 3d, and the output of hydrogen produced is 5.82mL / g VSS.

Embodiment 3

[0037] (1) In a plexiglass reactor with a working volume of 1 L, the excess sludge produced by the urban sewage treatment plant was placed at 4°C for natural settlement for 24 hours, and the fermented raw material (i.e., the excess sludge sample) was obtained after the supernatant was drained. , the following examples are the same).

[0038] (2) Add ferrate of 0.03g / g TSS to the reactor, fill the reactor with nitrogen for 10 minutes to exclude oxygen, seal the reactor and put it in a shaker for anaerobic fermentation. Through the combined action of microorganisms in the sludge and ferrate, the organic matter in the sludge is converted into hydrogen. Among them, the fermentation temperature of the reactor is controlled at 30±1°C, the stirring speed of the shaker is 150rpm / min, the residence time of the sludge in the reactor is 3d, and the output of hydrogen produced is 2.67mL / g VSS.

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Abstract

The invention relates to an anaerobic fermentation hydrogen production method using excess sludge as raw material, and an additive. The hydrogen production method comprises the following steps: S1, using excess activated sludge generated by a sewage treatment plant as raw material, settling and removing supernatant of the excess activated sludge to obtain anaerobically fermented raw material; s2,adding the anaerobically fermented raw material into a fermentation reactor, adding ferrate, stirring uniformly, and keeping an anaerobic environment in the fermentation reactor; and S3, controlling the temperature, continuously carrying out a fermentation reaction, and continuously outputting or intermittently outputting generated hydrogen. Compared with the prior art, the hydrogen production method adopts the ferrate, which not only can destroy the structure of the excess sludge and promote the release of a large quantity of biodegradable organic matters in the sludge, but also can significantly inhibit and reduce the activity and abundance of hydrogen-consuming microorganisms such as hydrogen-phagocytosis methanogens, and thereby significantly promotes the amount of hydrogen produced byfermentation of the excess sludge; the operation is simple, and the long-term operation management is facilitated; and the hydrogen production quantity of the residual sludge resources can be obviously increased.

Description

technical field [0001] The invention relates to the technical field of environmental protection and sludge treatment and resource utilization, in particular to an anaerobic fermentation hydrogen production method and an additive using excess sludge as a raw material. Background technique [0002] Activated sludge process has been widely used in municipal sewage treatment. Although this process can effectively treat sewage, it also produces a large amount of process by-products, namely residual activated sludge. It is estimated that in 2020, my country's surplus sludge production is expected to reach 60 million metric tons (with a water content of 80%). Excess sludge concentrates a large number of toxic and harmful substances, such as pathogens, heavy metals, persistent organic pollutants, etc. If not effectively treated and disposed of, the contained pollutants will pose a huge threat to human health and the ecological environment. At present, the cost of sludge treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P3/00C02F11/04C02F11/121
CPCC12P3/00C02F11/04C02F11/121
Inventor 徐秋翔倪丙杰孙婧
Owner TONGJI UNIV
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