Kitchen waste and sludge hydrogen-producing acidification pretreatment method capable of increasing methane production rate

A technology for kitchen waste and pretreatment, which is applied in biological sludge treatment, microorganism-based methods, biochemical equipment and methods, etc. The effect of increasing the production rate

Active Publication Date: 2015-04-29
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Jae Kyoung et al. conducted a study on the methanation potential (BMP) of food waste, and the results showed that: food waste has a high anaerobic methanation potential, and the methanation potential of meat, cellulose, rice, cabbage and mixed waste is 482. 356, 294, 277, 472mLCH4 / gVS, anaerobic biodegradability are 0.82, 0.92, 0.72, 0.73, 0.86 respectively, but the long-term stability test results are not good, the gas production rate is far below the UBMP research results

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  • Kitchen waste and sludge hydrogen-producing acidification pretreatment method capable of increasing methane production rate

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Embodiment 1

[0027] After the food waste and sludge are pulverized and pretreated, they are mixed according to a mass ratio of 1:1 to obtain pretreated raw materials. Then with 1% H 2 SO 4 The solution is prepared into a mixed solution with a pretreatment raw material concentration of 20g / L, and the mixed solution is hydrolyzed at a high temperature of 135°C for 15 minutes to obtain a fermented raw material; 200ml of fermented raw material is added to a fermentation bottle with a volume of 600ml. NaOH adjusted the pH of the mixture to 6.4. Add 0.2g of yeast powder, inoculate 20ml of dark fermentation hydrogen-producing bacteria, pass high-purity nitrogen gas for 20 minutes to create an anaerobic fermentation environment, and then carry out deep acidification pretreatment of dark fermentation hydrogen production at a constant temperature of 37°C; dark fermentation hydrogen production bacteria are collected from anaerobic digestion The sludge is separated, and the sludge is heated to kill ...

Embodiment 2

[0030] After the food waste and sludge are pulverized and pretreated, they are mixed according to a mass ratio of 1:1 to obtain pretreated raw materials. Then with 1% H 2 SO 4The solution is prepared into a mixed solution with a pretreatment raw material concentration of 25g / L, and the mixed solution is hydrolyzed at a high temperature of 135°C for 15 minutes to obtain a fermentation raw material; 300ml of the high-temperature-treated mixed solution is added into a 600ml fermentation bottle, and the mass concentration is The pH of the mixed solution was adjusted to 6.5 by 6mol / L NaOH. Add 0.3g of yeast powder, inoculate 30ml of dark fermentation hydrogen-producing bacteria, pass high-purity nitrogen gas for 20 minutes to create an anaerobic fermentation environment, and then carry out deep acidification pretreatment of dark fermentation hydrogen production at a constant temperature of 37°C; dark fermentation hydrogen production bacteria are collected from anaerobic digestion ...

Embodiment 3

[0033] After the food waste and sludge are pulverized and pretreated, they are mixed according to a mass ratio of 1:1 to obtain pretreated raw materials. Then with 1% H 2 SO 4 The solution is prepared into a mixed solution with a pretreatment raw material concentration of 30g / L, and the mixed solution is hydrolyzed at a high temperature of 135°C for 15 minutes to obtain a fermentation raw material; 500ml of the high-temperature-treated mixed solution is added to a fermentation bottle with a volume of 600ml, and the mass concentration is The pH of the mixed solution was adjusted to 6.6 by 6mol / L NaOH. Add 0.5g of yeast powder, inoculate 50ml of dark fermentation hydrogen-producing bacteria, pass high-purity nitrogen gas for 20 minutes to create an anaerobic fermentation environment, and then carry out deep acidification pretreatment of dark fermentation hydrogen production at a constant temperature of 37°C; dark fermentation hydrogen production bacteria are collected from anae...

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Abstract

The invention relates to the technology of biomass energy utilization, and aims to provide a kitchen waste and sludge hydrogen-producing acidification pretreatment method capable of increasing the methane production rate. The method comprises the following steps: mixing the kitchen waste and the sludge after crushing pretreatment, using the mixture and a sulfuric acid solution to prepare a mixed liquid, performing hydrolysis on the mixed liquid at 135 DEG C to obtain a starting crude; adding yeast powder into the starting crude, inoculating dark-fermentation hydrogenogens, feeding high-purity nitrogen to build an anaerobic fermentation environment, then performing dark-fermentation hydrogen-producing deep acidification pretreatment at the constant temperature of 37 DEG C, and obtaining a hydrogen-producing deep acidification pretreatment liquid; adding methanogens into the liquid, keeping the anaerobic environment at 37 DEG C, and performing methane fermentation and coproduction. According to the method disclosed by the invention, the hydrogen-producing deep acidification pretreatment is utilized to obviously increase the methane production rate; the rate peak time of the produced methane is reduced by about 50%; the waste treatment and degradation time of the fermentation tank with a unit volume is reduced by about 50%; the waste treatment capacity of the single equipment in unit time is improved by about one time.

Description

technical field [0001] The invention relates to biomass energy utilization technology, in particular to a method for increasing biomethane production rate through hydrogen production deep acidification pretreatment through mixed fermentation of kitchen waste and sludge. Background technique [0002] The increasing shortage of fossil energy and serious environmental pollution are two major crisis problems facing the world today. The serious impact of the greenhouse effect on the climate and environment has made people pay more and more attention to CO 2 To reduce emissions, vigorously developing new energy is an inevitable requirement for my country's energy security and sustainable development. Biomass energy is the most common renewable energy on earth, and its total consumption ranks first among renewable energy sources. Urban and rural organic waste is a renewable biomass resource with a huge amount and serious pollution. How to realize the reduction and harmless treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P39/00C12P5/02C02F11/04C12R1/01
CPCC12P5/023Y02E50/30
Inventor 程军岑可法王智化周俊虎刘建忠黄镇宇周志军杨卫娟张彦威
Owner ZHEJIANG UNIV
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