Kitchen garbage and sludge co-treatment method based on mesophilic and thermophilic anaerobic co-digestion

A kitchen waste and anaerobic digestion technology, which is applied in the treatment of biological organic parts, climate change adaptation, and the preparation of organic fertilizers, to achieve the effects of reducing process energy consumption, saving facility investment, and high biogas yield

Inactive Publication Date: 2015-04-29
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Anaerobic digestion of organic waste is the use of microorganisms to convert organic matter in waste into biogas that can be used as fuel. At the same time, it can better eliminate pathogenic bacteria in waste. Currently, this technology has been used in livestock and poultry farming However, at present, this technology still has a lot of room for improvement in terms of process optimization (such as process combination, process temperature, etc.) and process performance (such as treatment efficiency, biogas yield, etc.)

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  • Kitchen garbage and sludge co-treatment method based on mesophilic and thermophilic anaerobic co-digestion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The joint treatment method of kitchen waste and sludge based on medium and high temperature combined anaerobic digestion, such as figure 1 shown, including the following steps,

[0031] A. Shred the collected kitchen waste, and then transport it to the mixing chamber;

[0032] B. The dewatered sludge with a moisture content of 80% is delivered to the mixing chamber in step A, and the volume of the added dewatered sludge is 0.5 times the volume of kitchen waste in the mixing chamber;

[0033] Stir after injecting water again to obtain a slurried mixed material, and the injection amount of water is to ensure that the water content of the mixed material is 90%;

[0034] C. Transport the mixed material to the hydrolytic acidification tank, and hydrolyze and acidify it for 1 day;

[0035] D. Pump the hydrolyzed and acidified mixed material into the mesophilic anaerobic digestion tank for fermentation treatment. The temperature of the slurry in the mesophilic anaerobic dige...

Embodiment 2

[0040] The joint treatment method of kitchen waste and sludge based on medium and high temperature combined anaerobic digestion, such as figure 1 shown, including the following steps,

[0041] A. Shred the collected kitchen waste, and then transport it to the mixing chamber;

[0042] B. The dewatered sludge with a moisture content of 90% is delivered to the mixing chamber in step A, and the volume of the added dewatered sludge is twice the volume of kitchen waste in the mixing chamber;

[0043] Stir after injecting water again to obtain a slurried mixed material, and the injection amount of water is to ensure that the water content of the mixed material is 95%;

[0044] C. Transport the mixed material to the hydrolytic acidification tank, and hydrolyze and acidify it for 3 days;

[0045] D. Pump the hydrolyzed and acidified mixed material into the mesophilic anaerobic digestion tank for fermentation treatment. The temperature of the slurry in the mesophilic anaerobic digesti...

Embodiment 3

[0051] The joint treatment method of kitchen waste and sludge based on medium and high temperature combined anaerobic digestion, such as figure 1 shown, including the following steps,

[0052] A. Transport the collected kitchen waste to the crushing chamber for crushing treatment, and then transport it to the mixing chamber;

[0053] B. The dewatered sludge with a moisture content of 80-90% is delivered to the mixing chamber in step A, and the volume of the dewatered sludge added is 0.5-2 times the volume of kitchen waste in the mixing chamber;

[0054]After re-injecting water, it is stirred to obtain a slurried mixture, and the injection amount of water is to ensure that the water content of the mixture is 90-95%;

[0055] C. The mixed material is transported to the hydrolysis and acidification tank, and the hydrolysis and acidification treatment is carried out for 1-3 days;

[0056] D. The mixed material that has been hydrolyzed and acidified is pumped into a medium-temper...

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Abstract

The invention relates to the technical field of domestic garbage and discloses a kitchen garbage and sludge co-treatment method based on mesophilic and thermophilic anaerobic co-digestion. The method comprises the following steps: crushing kitchen garbage; mixing the kitchen garbage with dewatered sludge; conducting hydrolytic acidification treatment; conducting mesophilic anaerobic digestion; and conducting ozonation treatment; conducting thermophilic anaerobic digestion; and conducting dewatering treatment to prepare dewatered liquid and dewatered sludge cake, wherein conveying the dewatered liquid is conveyed to a liquid storage tank, and the dewatered sludge cake is used as organic fertilizer. According to the method, a mixture of kitchen garbage and sludge is treated by a mesophilic anaerobic digestion, ozonation and thermophilic anaerobic digestion combined technique, the treatment time is relatively short, the equipment investment is relatively low, and the yield of methane is high. After mesophilic anaerobic digestion, ozonation is added with the purposes of improving biodegradability and then improving the effect and gas yield of follow-up thermophilic anaerobic digestion, while ozonation treatment is basically added before anaerobic digestion in the conventional like technique.

Description

technical field [0001] The invention relates to the technical field of domestic waste treatment, in particular to a method for co-processing kitchen waste and sludge based on medium-high temperature combined anaerobic digestion. Background technique [0002] Kitchen waste is a huge amount of organic waste that needs to be properly disposed of. With the development of urbanization in my country and the improvement of people's living standards, the amount of urban kitchen waste in my country is increasing year by year. Up to now, the annual output of municipal solid waste in my country has exceeded 160 million tons, of which nearly half is kitchen waste. The increasing amount of kitchen waste has become a major burden on urban waste disposal in my country. [0003] A large amount of sludge will inevitably be generated in the process of sewage or wastewater treatment. Taking urban sewage treatment plants as an example, about 8 tons of dewatered sludge will be generated for eve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F17/00C05F9/04
CPCY02W30/40Y02A40/20
Inventor 张琦张曦文冯丽方斌伟岳阳曹玉成
Owner ZHEJIANG FORESTRY UNIVERSITY
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