Regulation and control method for fruit and vegetable waste high-load stable anaerobic digestion

A fruit and vegetable waste, anaerobic digestion technology, applied in the direction of biochemical equipment and methods, waste fuel, microbial measurement/inspection, etc., can solve the adverse effects of biogas residue and biogas slurry utilization, cannot completely change the habitat of methanogens, The system cannot restore gas production and other problems well, so as to achieve high gas production rate of tank capacity and prevent instability

Inactive Publication Date: 2016-08-17
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual practice is to add alkaline substances such as limestone, sodium hydroxide, potassium hydroxide, etc. to adjust the pH value of the system, but the addition of alkaline substances will have an adverse effect on the subsequent utilization of biogas residue and biogas slu...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Experimental group: Using fruit waste as raw material, a 50L stirred fully mixed reactor (CSTR) was used, and the biogas fermentation inoculum was domesticated before feeding. After domestication for 30 days, the initial pH value of the inoculum in the reactor was determined to be 7 In the range of ~8, the gas production is stable, the content of methane is in the range of 55% to 65%, and the content of carbon dioxide is in the range of 25% to 35%, that is, CH 4 / CO 2 In the range of 1.57 to 2.00, the biogas fermentation temperature is controlled to be 35°C±2°C.

[0019] In the first stage of fermentation load, that is, during the operation period from 1st to 30th day, the organic load rate of the feed is 1.0g VS / L.d, CH 4 / CO 2 The values ​​are all in the range of 1.5 to 2.0; during the 31st to 60th day of operation, feed with an organic load of 2.0 g VS / L.d, CH 4 / CO 2 The values ​​are all in the range of 1.4-1.8.

[0020] From the 61st day, when the feed organic...

Embodiment 2

[0024] Experimental group: Using vegetable waste as raw material, a 100L fully mixed reactor (CSTR) was used, and the biogas fermentation inoculum was domesticated before feeding. After domestication for 15 days, the initial pH value of the inoculum in the reactor was determined to be 7 In the range of ~8, the gas production is stable, the methane content is in the range of 55%~65%, the BA value is stable in the range of 8000~10000mg / L, and the biogas fermentation temperature is controlled at 35℃±2℃.

[0025] In the first stage of fermentation load, that is, the operation period from the first day to the 30th day, the organic load rate of the feed is 1.0g VS / L.d, and the BA value is within the normal range (BA value is in the range of 5000-10000mg / L) ; Feed with an organic load of 2.0 gVS / L.d ​​during the operation period of 31-60 days, and the BA value is also within the normal range (BA values ​​are all in the range of 2000-5000mg / L).

[0026] From the 61st day, when the fee...

Embodiment 3

[0030] Experimental group: using fruit and vegetable mixed waste as raw material, a 70L fully mixed reactor (CSTR) was used, with an effective volume of 50L, and the biogas fermentation inoculum was domesticated before feeding. The initial pH value of the inoculum is in the range of 7-8, the gas production is stable, the methane content is in the range of 55%-65%, the concentration of n-butyric acid is extremely low (<5mg / L), and the biogas fermentation temperature is controlled at 55°C±2 ℃.

[0031] In the first stage of fermentation load, that is, during the operation period from 1st to 30th day, the organic loading rate of the feed was 1.0g VS / L.d, and the concentration of n-butyric acid was maintained at a stable low level (the concentration of n-butyric acid was all at 5.0 mg / L or less); during the 31st to 60th day of operation, feed with an organic load of 2.0 g VS / L.d, and the concentration of n-butyric acid was also maintained at a stable low level (the concentration o...

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Abstract

The invention discloses a regulation and control method for fruit and vegetable waste high-load stable anaerobic digestion. Early warning is achieved by monitoring the concentrations of CH4 and CO2 in a gas phase and the alkalinity of bicarbonate and the concentration of n-butyric acid in a liquid phase in an anaerobic fermentation system, and the anaerobic fermentation system is regulated and controlled by means of at least one mode of reducing the feed load rate, backwards flowing biogas slurry or adding ammonium bicarbonate. The anaerobic fermentation system can stably run under the condition of high organic load rate, and the high volume gas productivity is achieved; early warning is achieved by monitoring the concentrations of CH4 and CO2 in the gas phase and the alkalinity of bicarbonate and the concentration of n-butyric acid in the liquid phase in the anaerobic fermentation system; by means of three instability early warning regulation and control methods, timely early warning is conducted for system acidification likely to appear, further instability of the biogas fermentation system is prevented by means of corresponding means, and the biogas fermentation system at an instable state is regulated back to the normal state.

Description

technical field [0001] The invention belongs to the technical field of biological fermentation, and in particular relates to a control method for high-load stable anaerobic digestion of fruit and vegetable waste. Background technique [0002] Anaerobic digestion, also known as biogas fermentation or anaerobic fermentation, is one of the best technical ways to reduce the environmental pollution of organic waste and recover the clean energy contained in it. With the rapid development of agricultural intensive planting in my country, the output of fruit and vegetable waste has increased dramatically. Fruit and vegetable waste has the characteristics of high water content, high organic matter and nutrient content, and is very suitable for anaerobic digestion. However, vegetable waste is an extremely perishable raw material, which is prone to acidification to inhibit gas production during anaerobic digestion, especially under high-load anaerobic digestion conditions. Therefore,...

Claims

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Application Information

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IPC IPC(8): C12Q3/00C12P5/02
CPCC12P5/023C12Q3/00Y02E50/30
Inventor 李东陈琳刘晓风李志东闫志英袁月祥
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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