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Method for producing hydrogen and methane by kitchen waste diphasic anaerobic fermentation

A technology of kitchen waste and anaerobic fermentation, applied in organic fertilizers, climate change adaptation, biosynthesis, etc., to achieve the effects of low operating costs, reduced energy consumption, and improved thermal efficiency

Inactive Publication Date: 2008-03-05
DONGGUAN KECHUANG FUTURE ENERGY SOURCE TECHDEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional food waste treatment methods, including feed, composting, landfill, incineration, etc., have various problems and deficiencies. To develop a treatment and disposal method suitable for the characteristics of food waste, it is low cost, simple to operate, and Reasonable and effective treatment and disposal of kitchen waste on the basis of high utilization of resources in kitchen waste and no secondary pollution is a major problem that needs to be solved at present

Method used

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  • Method for producing hydrogen and methane by kitchen waste diphasic anaerobic fermentation

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Experimental program
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Effect test

Embodiment 1

[0029] Composition of food waste: rice and flour products: vegetables: meat = 6:3:1; room temperature conditions: 24-28°C during the day and 15-20°C at night.

[0030] Mix the kitchen waste and water evenly at a weight ratio of 1:2, then crush them, and filter through an 80-mesh screen to remove larger substances; adjust the remaining sludge to a concentration of about 10g / L in the sludge conditioning tank, and use the same 80-mesh sieve to remove larger substances.

[0031] Mix the kitchen waste obtained above with the remaining sludge at a weight ratio of 2:1. After passing through a heat exchanger, enter the thermal pretreatment tank for heating. The heating condition is 80°C for 30 minutes.

[0032] The heat-treated mixture enters a heat exchanger where it exchanges heat with the non-heat-treated mixture.

[0033] After heat exchange, the temperature of the mixture of food waste and excess sludge entering the anaerobic reaction tank is about 35-40°C. Under the agitation o...

Embodiment 2

[0036] Food waste composition: by weight, rice and flour products: vegetables: meat = 6:3:1, room temperature conditions: 26-29°C during the day, 19-25°C at night.

[0037] After mixing the kitchen waste and water at a ratio of 1:3 by weight and crushing them evenly, filter them with an 80-mesh screen to remove larger substances.

[0038] Adjust the remaining sludge to a concentration of about 20g / L in the sludge conditioning tank, and filter through an 80-mesh screen to remove larger substances.

[0039] The kitchen waste obtained above is mixed with the remaining sludge at a weight ratio of 3:1. After passing through a heat exchanger, it enters a thermal pretreatment tank for heating. The heating condition is 121° C. for 10 minutes.

[0040] The heat-treated mixture enters a heat exchanger where it exchanges heat with the non-heat-treated mixture.

[0041] After heat exchange, the temperature of the mixture of food waste and excess sludge entering the first phase anaerobic ...

Embodiment 3

[0044] Food waste composition: by weight, rice and flour products: vegetables: meat = 6:3:1, room temperature conditions: 24-28°C during the day, 15-20°C at night.

[0045] After the kitchen waste and water are mixed at a weight ratio of 1:4 and evenly crushed, the larger substances are filtered through a 60-mesh screen.

[0046] The second-phase anaerobic fermentation methane-producing fermentation residue was adjusted to a concentration of about 15 g / L in the sludge conditioning tank, and larger substances were also filtered through a 60-mesh screen.

[0047] The kitchen waste obtained above is mixed with the fermentation residue of the second phase at a weight ratio of 3:1. After passing through the heat exchanger, it enters the thermal pretreatment pool for heating. The heating temperature is 150° C. for 10 minutes.

[0048] The heat-treated mixture enters a heat exchanger where it exchanges heat with the non-heat-treated mixture.

[0049] After heat exchange, the tempera...

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Abstract

The biphase anaerobic fermentation process of kitchen refuse to produce hydrogen and methane includes the following steps: 1. sorting kitchen refuse and mixing with water in certain amount; 2. mixing with sludge from sewage treating yard and heat treatment; 3. heat exchange between heat treated mixture and mixture without through heat treatment; 4. anaerobic fermentation of the heat treated mixture in the first phase to produce hydrogen; 5. anaerobic fermentation of the residue from the first phase fermentation in the second phase to produce methane; and 6. using the residue from the second phase fermentation as fertilizer or returning to replace sludge serving as hydrogen producing bacteria source. The process is simple, can recover the biomass energy from kitchen refuse effectively, and has no secondary pollution.

Description

technical field [0001] The invention belongs to the field of solid waste treatment and recycling, and more specifically relates to a method for producing hydrogen and methane by two-phase anaerobic fermentation of kitchen waste. Background technique [0002] Kitchen waste is a general term for leftover meals discarded by catering units such as households, hotels, restaurants, government agencies, enterprises and institutions, and is a kind of organic solid waste generated in people's daily life. The composition of food waste is very complex, which is a hodgepodge of oil, water, mixed vegetables, fruit peels, fruit stones, rice noodles, fish, meat, bones, waste tableware, paper towels, etc. Organic substances such as starch, dietary fiber, animal fat and protein are food waste The main component of kitchen waste. The amount of kitchen waste produced is huge. According to statistics, the daily production of kitchen waste in Shanghai reaches about 1,300 tons, that in Beijing r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F9/04
CPCY02E50/343Y02A40/20Y02E50/30Y02P20/59Y02W10/20Y02W30/40
Inventor 肖本益林佶侃
Owner DONGGUAN KECHUANG FUTURE ENERGY SOURCE TECHDEV
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