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Method for improving straw and excrement mixed anaerobic digestion gas production performance by biochemical pretreatment of maize straw

A technology of corn stalk and anaerobic digestion, applied in biological sludge treatment, waste fuel, fermentation and other directions, can solve the problems of unbalanced nutrition and difficult degradation, and achieve the effect of saving operation cost, low cost and simple operation.

Active Publication Date: 2016-03-23
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the defects of refractory degradation and nutritional imbalance in the anaerobic fermentation process, the present invention is proposed

Method used

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  • Method for improving straw and excrement mixed anaerobic digestion gas production performance by biochemical pretreatment of maize straw
  • Method for improving straw and excrement mixed anaerobic digestion gas production performance by biochemical pretreatment of maize straw
  • Method for improving straw and excrement mixed anaerobic digestion gas production performance by biochemical pretreatment of maize straw

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Get 48 parts by weight of 39g corn stalks (calculated as TS), use dry weight TS in 2%-4% biogas slurry (biogas slurry that passes through 5 mesh, 10 mesh, 20 mesh and 40 mesh filter screen) and total solids concentration (10%, 15%, 20% and 25%) two factorial design full factorial pretreatment experiments. The above biogas slurry was added to 48 parts of corn stalks and sealed at 35°C for 3 days.

[0031] After the pretreatment, 13g of cow manure (calculated as TS) and 12g of anaerobic digester sludge (calculated as TS) from a sewage treatment plant in normal operation were added as inoculum and mixed for anaerobic digestion reaction for 50 days. Record the daily biogas production by drainage method, and measure the percentage of methane every day, calculate the total methane production, and then calculate T 80 . The experimental results are as follows:

[0032] Table 1 Anaerobic digestion effluent properties

[0033]

[0034] Table 1 shows the amount of methane p...

Embodiment 2

[0037] Weigh four parts of corn stalks, the amount of each part is 30g (calculated in TS), and use a 5-mesh sieve to collect 3:1 mixture of pure straw, straw and pig manure obtained from normal operation and stable fermentation for one year, and pure food kitchen waste. The output of the oxygen fermentation biogas digester is filtered, and the filtered biogas slurry is fully mixed with the crushed corn stalks according to 6 times the dry weight TS of the corn stalks. The pretreated corn stalks were sealed in ziplock bags, and pretreated at 35°C for 3 days, and the control group was unpretreated corn stalks.

[0038]The pretreated corn stalks were mixed with 10g of pig manure (calculated in TS) and 12g of sludge from the anaerobic digestion tank of a sewage treatment plant in normal operation (calculated in TS) as inoculum, added to the anaerobic digestion reactor, and tap water was added. to 80% of the reactor volume. Put the reactor filled with nitrogen gas and sealed after ...

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Abstract

A method for improving straw and excrement mixed anaerobic digestion gas production performance by biochemical pretreatment of maize straw belongs to the field of anaerobic digestion of organic solid waste, and comprises the following steps: extracting biogas liquid from a biogas liquid pool, and sieving with a sieve; crushing straw, uniformly mixing the crushed straw with the biogas liquid, placing the obtained mixture in a closed vessel, and pretreating in a thermostat at 35 DEG C for 1 to 3 days; uniformly mixing the obtained material with excrement, inoculating anaerobic digestion sludge, adjusting the pH, adding water for dilution and performing moderate-temperature anerobic fermentation. Compared with the prior art, the method has the following benefits: (1) the pretreatment time is remarkably shortened by 5-14 days; (2) the anerobic fermentation period is remarkably shortened by 23.08-43.59%; (3) the yield of methane is remarkably improved by 25.72-36.55%; (4) the process is simple, the cost is low, and the operation is easy.

Description

technical field [0001] The invention belongs to the field of anaerobic digestion of organic solid waste, and in particular relates to a method for improving the gas production performance of mixed anaerobic digestion of straw and feces through biochemical pretreatment of corn straw. Background technique [0002] my country is a traditional large agricultural country, with an annual output of more than 800 million tons of crop straw, of which 284 million tons of corn straw. Most of the corn stalks are burned in open air or stacked in the field because they cannot be used effectively in a timely manner, which seriously pollutes the atmospheric environment and wastes resources. Anaerobic digestion technology has been proven to be an important method to effectively obtain biomass energy, and has the advantages of low energy consumption and high production capacity. It has been widely used in industrial applications and large-scale demonstrations in my country. [0003] Anaerobi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C02F11/04
CPCC02F11/04C12P5/023C12P2201/00C12P2203/00Y02E50/30
Inventor 李秀金魏域芳袁海荣彭翔
Owner BEIJING UNIV OF CHEM TECH
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