Method for using reduced iron powder to promote anaerobic fermentation of sludge to produce short-chain fatty acids

A technology of sludge anaerobic fermentation and short-chain fatty acid, which is applied in the fields of environmental protection and resource utilization to achieve the effects of reducing volume, high utilization value, and promoting acid production rate and yield

Active Publication Date: 2015-07-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there is no report on the use of reduced iron powder to promote sludge fermentation to produce short-chain fatty acids

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) In a plexiglass reactor with a working volume of 5.0L, the supernatant liquid produced by the traditional activated sludge method was added after natural static settling for 24 hours, and the remaining sludge (pH=6.8) obtained was used as an anaerobic fermentation production Substrates of short-chain fatty acids (i.e. sludge samples, the same as in the following examples);

[0033] (2) Add reduced iron powder with a particle size of 0.15 mm to the reactor, and the ratio of its dosage to the dry weight of the sludge is 0.3:1. The reactor is filled with nitrogen and oxygen for 10 minutes, and the reactor is sealed for fermentation. Through the combined action of microorganisms in the sludge and reduced iron powder, the organic matter contained in the sludge is converted into short-chain fatty acids. The temperature of the fermentation reaction is controlled at 20±1°C, the pH of the fermentation system varies within the range of 6.5-8.0, the residence time of the sludg...

Embodiment 2

[0035] (1) In a plexiglass reactor with a working volume of 5.0L, the supernatant liquid produced by the traditional activated sludge method was added after natural settling for 24 hours, and the remaining sludge (pH=6.8) obtained was used as an anaerobic fermentation production short Substrates for chain fatty acids;

[0036] (2) Add reduced iron powder with a particle size of 0.15 mm to the reactor, and the ratio of its dosage to the dry weight of the sludge is 1.2:1. The reactor is filled with nitrogen and oxygen for 10 minutes, and the reactor is sealed for fermentation. Through the combined action of microorganisms in the sludge and reduced iron powder, the organic matter contained in the sludge is converted into short-chain fatty acids. The reaction temperature is 20±1°C, the pH of the fermentation system varies within the range of 6.5-8.0, the residence time of the sludge in the reactor is 5 days, and the content of short-chain fatty acids produced is 473.67 mg / L (based...

Embodiment 3

[0038] (1) In a plexiglass reactor with a working volume of 5.0L, add the supernatant liquid produced by the traditional activated sludge method after natural static settling for 24 hours, and the obtained residual sludge (pH=6.8) is used as an anaerobic fermentation production Substrates for short-chain fatty acids;

[0039] (2) Add reduced iron powder with a particle size of 10 μm to the reactor, and the ratio of the amount to the dry weight of the sludge is 0.3:1. The reactor is filled with nitrogen and oxygen for 10 minutes, and the reactor is sealed for fermentation. Through the combined action of microorganisms in the sludge and reduced iron powder, the organic matter contained in the sludge is converted into short-chain fatty acids. The reaction temperature is 20±1°C, the pH of the fermentation system varies within the range of 6.5-8.0, the residence time of the sludge in the reactor is 5 days, and the content of short-chain fatty acids produced is 620.92 mg / L (based on...

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Abstract

The invention belongs to the technical field of environmental protection and recycling and relates to a method for promoting anaerobic sludge fermentation to produce short-chain fatty acids. The method comprises the following steps of: (1) putting sludge into a container, discharging the supernatant liquid, and obtaining a sludge sample; and (2) adding reduced iron powder into the sludge sample, filling nitrogen for oxygen displacement in a reactor, sealing the reactor, uniformly mixing substances in the reaction system, controlling the fermentation temperature, and performing anaerobic fermentation. The sludge can be effectively reduced, the environmental pollution is reduced, the sludge can be recycled, and lots of short-chain fatty acids with high utilization values are produced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and resource utilization, and relates to a method for promoting anaerobic fermentation of sludge to produce short-chain fatty acids. Background technique [0002] As a secondary treatment method of urban sewage treatment, biological treatment uses microorganisms in the system to complete the degradation of organic pollutants, and the main purpose is to remove suspended solids and dissolved biodegradable organic matter. It has been widely used at present. application. However, a large amount of organic-rich sludge (including primary sludge and residual sludge) will be produced in the biological treatment process. It is estimated that by the end of 2010, my country's sludge output has reached 4 million tons (dry weight), and the resulting environmental pollution is becoming more and more serious, and it is urgent to properly treat and dispose of it. [0003] Anaerobic fermentation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P7/40C12P7/52C12P7/54
Inventor 冯雷雨罗景阳杨兰琴陈银广李暮
Owner TONGJI UNIV
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