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Start-up method of anaerobic digestion of cabbage waste and application of processing cabbage waste

An anaerobic digestion and waste technology, which is applied to the application field of cabbage waste treatment, can solve the problems of difficult and rapid transformation of cabbage waste and restricting the resource reuse of cabbage waste.

Active Publication Date: 2021-06-18
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, it is difficult to quickly convert cabbage waste into energy substances such as biogas, which limits the resource reuse of cabbage waste

Method used

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  • Start-up method of anaerobic digestion of cabbage waste and application of processing cabbage waste
  • Start-up method of anaerobic digestion of cabbage waste and application of processing cabbage waste
  • Start-up method of anaerobic digestion of cabbage waste and application of processing cabbage waste

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Mix 2 liters of cellulolytic bacteria WDC2 culture solution, 8 L of environmental flora (pond sediment sediment (taken from "Qiusuo Creek" of Three Gorges University in Yichang, Hubei), cow dung (outskirts of Zhijiang City, Yichang, Hubei), straw (rape) The anaerobic digestion liquid is mixed according to the mass ratio of 1:1:1) and injected into the 64L continuous stirred reactor (Continuous Stirred Tank Reactor, CSTR), see figure 1 . Add water to 50L as an anaerobic digestion solution. The cabbage waste (taken from the market and supermarket waste cabbage, the water content of the cabbage waste is greater than 94.9%, the C / N is 17.5, cut into 1cm pieces) is fed into the anaerobic reactor. The reactor temperature was set at 52°C.

[0024] After the anaerobic reactor is started, set the CSTR to adopt the intermittent stirring method, that is, 100 rpm, stir for 10s, stop, after an interval of 20s, then stir at 100rpm for 10s, and then repeat the cycle; according to th...

Embodiment 2

[0026] Changes in Gas Production of Anaerobic Digestion of Cabbage Waste

[0027] During the anaerobic fermentation of cabbage waste, the gas production was monitored. The air outlet of the anaerobic reactor is connected to the buffer bottle and connected to a wet gas flow meter (LML-1, Hengshui Xiangsheng Guofeng Technology Co., Ltd.) to record the gas production status of the anaerobic reactor.

[0028] The results showed that after the anaerobic reactor was started, the gas production showed a fluctuating pattern and gradually increased. After the anaerobic reactor was started, the organic load of the feed was gradually increased to 10.1g / (L·d) within 40 days, and then the organic load of 10.1g / (L·d) was maintained until the 240th day. The anaerobic digestion reaction system can maintain stable gas production at this stage, and the gas production reaches the maximum stage during the 213th to 231st day of reactor operation, and the average production period efficiency is 38...

Embodiment 3

[0030] Variation characteristics of methane content in biogas during anaerobic digestion of cabbage waste

[0031] During the anaerobic digestion of cabbage, the methane content in biogas was detected by gas chromatography. The specific method is that gas chromatography (Timet, 7890F type) is used for methane detection, and the chromatographic column is packed column GDX-502. It is 100 μL of the gas to be tested, which is detected by an FID detector. Each bottle of sample testing was repeated 3 times. Using high-purity methane (99%) as the standard gas, a standard curve was obtained, and the concentration of methane in the sample was detected by the external standard method.

[0032] Methane in biogas is produced by the conversion of small molecular organic acids or hydrogen / carbon dioxide by methanogenic archaea in the anaerobic digestion flora during anaerobic digestion. Methane has good combustion performance, which determines the use value of biogas. In the present inv...

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Abstract

The invention provides a bioreactor start-up method for anaerobic digestion of cabbage waste for methane production and its application to anaerobic digestion of cabbage waste for methane production. The method utilizes a continuous stirring reactor at 50-55°C to Cabbage waste was used as raw material to start the anaerobic reactor. Gradually increase the amount of cabbage waste feed by increasing the organic load of anaerobic digestion by gradient. After 200-250 days of enrichment culture, the anaerobic digestion liquid with better anaerobic digestion performance was obtained, and the maximum biogas production efficiency was 384.7 mL / g cabbage dry matter. The anaerobic digestion solution can effectively decompose the cabbage and filter paper, and the decomposition rates of the dry weight of cabbage and filter paper are 72.6±1.1% and 91.4±2.4% (mass fraction), respectively.

Description

technical field [0001] The invention relates to a start-up method of a bioreactor for anaerobic digestion of cabbage waste for methane production and its application to processing cabbage waste. Background technique [0002] Cabbage is one of the vegetables with the most abundant output. In my country, the annual output is about 1.1×10 8 Ton. During the process of harvesting, transporting and selling cabbage, some cabbage leaves are peeled off, resulting in a large amount of cabbage waste. According to statistics, in the whole process, 30% of the total weight of cabbage will be abandoned as waste. A large amount of cabbage waste hoarded has the risk of polluting the air and groundwater sources, putting enormous pressure on the environment. [0003] On the other hand, cabbage waste is also an important biomass resource, which can be converted into biogas through anaerobic digestion to produce bioenergy. [0004] However, due to the high water content of cabbage waste, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P5/02
CPCC12P5/023C12P2201/00Y02E50/30
Inventor 吕育财龚大春张耀平李宁郭金玲田毅红
Owner CHINA THREE GORGES UNIV