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Biomass pretreatment method, method and equipment for preparing firedamp by biomass anaerobic fermentation

An anaerobic fermentation and pretreatment technology, which is applied to fertilizers made from biological waste, bio-organic part treatment, fermentation, etc., can solve the problems of adverse effects of residue utilization, low volumetric efficiency of reactors, and slow growth of bacteria. Achieve the effects of improving biodegradability, accelerating fermentation speed and avoiding emissions

Active Publication Date: 2009-10-21
江苏乐尔环境科技股份有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The traditional pretreatment includes acid hydrolysis, alkali hydrolysis and hydrothermal reaction, etc., but the cost is generally high, and the added chemical agents have adverse effects on the subsequent utilization of residues
Due to the slow reproduction speed of the bacteria in methane fermentation, and the difficulty of separating the bacteria from the effluent in the traditional straw fermentation process, it is difficult to maintain a high concentration of the bacteria in the reactor. Therefore, the fermentation speed is slow and the reactor low volumetric efficiency

Method used

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  • Biomass pretreatment method, method and equipment for preparing firedamp by biomass anaerobic fermentation

Examples

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Effect test

Embodiment 1

[0027] like figure 1 As shown, the biomass 1 (corn stalks in this example) is crushed to 20 mm by a crusher (not shown in the figure), and sent to the infiltration tank 2, and water 3 is added according to the proportion of 25% of the weight content of the straw. Soak for 1 hour. Then it is sent to the shredder 4, and under the action of two round rollers with different linear speeds, the soaked straw is torn into thin slices, and then sent to the ultrasonic infiltrator 5, and nitric acid is added in a proportion of 0.65% of the total weight. (6 in the figure), the ultrasonic wave acts for 2.5 minutes. Afterwards, it is sent to the hydrothermal reactor 7, and the hydrothermal reaction is carried out for 1 hour under the condition of 138° C., and the straw is decomposed into biodegradable substances. The material after the hydrothermal reaction is sent to a press machine 8 to be separated into a saccharified liquid 9 and a saccharified straw residue 14 . The saccharification...

Embodiment 2

[0029] Processing systems such as figure 1 As shown, the difference is that the mixture of wheat straw (chopped to 40mm) and wood sawdust (by weight, wheat straw: wood sawdust is 2:1) is sent into the soaking tank, and in the soaking tank, it is pressed Add nitric acid at a ratio of 0.2% of the total weight and phosphoric acid at a ratio of 0.05% of the total weight, soak for 15 minutes at 80°C, then act for 45 seconds under ultrasonic energy density of 1.0W / cm2, and then perform hydrothermal treatment at 180°C React for 10 minutes. The press for the pretreated material is a belt filter press. After fermentation, the saccharification residue is directly used as fertilizer without pressing. The biomass conversion rate was 52%. Compared with no hydrothermal reaction, the fermentation speed is increased by more than 2 times, and the volume load of liquid phase fermentation is increased by more than 2 times.

Embodiment 3

[0031] The rice straw broken to 10mm and the cassava stalk of 3mm (by weight, rice straw: cassava stalk is 2:1) are sent into such as figure 1 Immersion tank of the system shown, carrying out hydrothermal reaction and methane fermentation. The difference is that nitric acid is added in a proportion of 0.2% of the total weight, sulfuric acid is added in a proportion of 0.05%, hydrochloric acid is added in a proportion of 0.01%, phosphoric acid is added in a proportion of 0.02%, soaked at 60°C for 2 hours, and shredded Finally, under the condition that the ultrasonic energy density is 3W / cm2, it acts for 20 seconds. The hydrothermal reaction temperature is 130° C., and the time is 2 hours. Pressing with a screw press. The saccharification residue is directly used as fertilizer without fermentation. The liquid phase reactor can reach more than 18kg-COD / (m3·d), and the biomass conversion rate can reach 66%. Compared with the mixed fermentation, the liquid phase fermentation vol...

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Abstract

The invention relates to a biomass pretreatment method, a method and an equipment for preparing firedamp by biomass anaerobic fermentation, comprising the following steps of: 1) treating the biomass as short sections of 3-40mm; 2) soaking the short sections in water at the temperature of 15-80 DEG C for 15-90min; 3) tearing up the soaked short sections into fragments; 4) leading fragments to carry out a hydrothermal reaction under a heating or heating and pressurizing condition; and 5) quenching the straws to obtain saccharification solution or saccharification slag after the hydrothermal reaction. The method improves the biological degradability by the pre-treatment of the straws, quickens the fermentation speed, greatly improves the fermentation efficiency by respectively fermenting the pre-treated solid and liquid, avoids the exhaust of a large amount of waste liquid by the circular fermentation of hydrothermal reaction of the fermentation liquid, leads the whole system to run at high efficiency and greatly improves the conversion rate of the biomass.

Description

technical field [0001] The invention belongs to the technology in the field of solid waste treatment and recycling. In particular, a biomass pretreatment method and a method and equipment for producing biogas by anaerobic fermentation of biomass. Background technique [0002] A large amount of straw is produced in the process of agricultural production, and a large amount of biomass waste such as sawdust, bark and scraps are produced in the process of tree product production, especially agricultural straw is often burned on site as waste to pollute the environment. On the other hand, biomass contains a large amount of organic matter and is a rich resource. There have been many explorations on the resource utilization of biomass. Wherein, it is often costly to make a product with high purity, which is difficult to be practical. As fuel is directly burned, it is easy to pollute on a small scale, and it is difficult to use it efficiently due to low energy density on a large s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C05F5/00
CPCY02E50/343Y02A40/20Y02E50/30Y02W30/40
Inventor 张书廷
Owner 江苏乐尔环境科技股份有限公司
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