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A method for synchronously increasing methane production and methane percentage content by adjusting alkali and carbon-nitrogen ratio

A technology of percentage content and carbon-nitrogen ratio, applied in biological sludge treatment, waste fuel, etc., can solve the problems of low methane percentage and low methane efficiency, achieve efficient recovery, improve efficiency, increase methane production and The effect of the percentage of methane

Active Publication Date: 2017-02-01
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problems of low methane production efficiency of remaining sludge and low methane percentage content in biogas, and provides a method to simultaneously increase methane production and methane percentage content by adjusting the alkali and carbon-nitrogen ratio, so as to realize methane production and methane The method of simultaneously maximizing the percentage content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Add 1kg of sewage plant surplus sludge and ryegrass mixture with a carbon-to-nitrogen ratio (C / N) of 9 / 1 into a 2L reactor (made of glass fiber reinforced plastic, with a working volume of 1.5L, an inner diameter of 10cm, a height of 26cm, and a cylindrical shape ), at a temperature of 35-37°C for anaerobic digestion to produce methane, control the anaerobic digestion time to 20-30d, and adjust the initial pH value to 4-13. It is found that the initial pH value is 4, and the anaerobic digestion time is At 30 days, the methane production was 159.6 L / kgVS add , the percentage content of methane at this time is 52.5%.

Embodiment 2

[0020] Add 1kg of sewage plant surplus sludge and ryegrass mixture with a carbon-to-nitrogen ratio (C / N) of 9 / 1 into a 2L reactor (made of glass fiber reinforced plastic, with a working volume of 1.5L, an inner diameter of 10cm, a height of 26cm, and a cylindrical shape ), anaerobic digestion at a temperature of 35-37°C to produce methane, the anaerobic digestion time is controlled to 20-30d, and the initial pH value is adjusted to 4-13. It is found that the initial pH value is 5, and the anaerobic digestion time is 30d , the methane production was 201.6 L / kgVS add , the percentage content of methane at this time is 55.6%.

Embodiment 3

[0022] Add 1kg of sewage plant surplus sludge and ryegrass mixture with a carbon-to-nitrogen ratio (C / N) of 9 / 1 into a 2L reactor (made of glass fiber reinforced plastic, with a working volume of 1.5L, an inner diameter of 10cm, a height of 26cm, and a cylindrical shape ), anaerobic digestion at a temperature of 35-37°C to produce methane, the anaerobic digestion time is controlled to 20-30d, and the initial pH value is adjusted to 4-13. It is found that the initial pH value is 6, and the anaerobic digestion time is 30d , the methane production is 225.5 L / kgVS add , the percentage of methane at this time is 61.5%.

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PUM

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Abstract

The invention belongs to the technical field of environmental protection, and relates to a method for synchronously increasing the yield and the percentage composition of methane through adjustment of alkali and carbon nitrogen ratios. According to the method, excess sludge and ryegrass which is cut to form small blocks with the length ranging from 1cm to 2cm are sufficiently mixed, and different carbon nitrogen ratios (C / Ns) are adjusted, so that the balance between organic matter and microelement in an anaerobic digestion system is achieved, and stable operation of an anaerobic digestion technology is guaranteed; different initial pH values of the system are adjusted to promote hydrolysis and acidification of the excess sludge and the ryegrass. By means of the combination effect of the C / Ns and the initial pH values of the anaerobic digestion system, carbon sources are added to the anaerobic digestion system, hydrolysis and acidification of the excess sludge and the ryegrass are promoted, and therefore the yield of the methane is increased; transformation of protein in the sludge is also improved, the yield of hydrogen is increased, dissolution of carbon dioxide is promoted, and therefore the percentage composition of the methane in biogas is increased. The increase of the yield of the methane and the increase of the percentage composition of the methane can be achieved at the same time through the combination effect of the C / Ns and the initial pH values.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a method for synchronously increasing methane output and methane percentage by adjusting the ratio of alkali and carbon to nitrogen. Background technique [0002] According to the China Environmental Status Bulletin in 2013, as of the end of 2013, the national urban sewage treatment rate was 89.21%, forming a sewage treatment capacity of about 124 million cubic meters per day. At the same time, sewage plants produced a large amount of excess sludge. According to 80%, the annual sludge output will exceed 30 million tons, and the sludge output will reach 60-90 million tons in 2020. The treatment and disposal of sludge has become an urgent problem to be solved. Sludge anaerobic digestion technology can not only stabilize sludge, but also efficiently recover biomass energy (such as biogas), and has become a common method of sludge treatment. Since the occurrence of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04
CPCY02E50/30
Inventor 张栋李晓帅王涛傅翔赵健戴晓虎
Owner TONGJI UNIV