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Anaerobic fermentation method of kitchen wastes and wastewater

A technology for anaerobic fermentation and kitchen waste, applied in fermentation, waste fuel, etc., can solve problems such as unfavorable needs, low methane content, and low biogas production

Active Publication Date: 2014-04-02
CHENGDU HENGRUN HIGH NEW SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the gas yield of biogas obtained by anaerobic fermentation of kitchen waste wastewater is low, and the methane content is low, which is not conducive to its due

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Corn stalks and pig manure were added to kitchen waste wastewater with 5% TS, 80% VS / TS, 1.5 g / L total carbon content, and a carbon-to-nitrogen ratio of 10 to obtain a mixture with a carbon-to-nitrogen ratio of 32:1. solution;

[0047] Inoculate the concentrated sludge from the concentration tank of the sewage treatment plant into the mixed solution, the inoculum amount is 50%, and the mixed solution after inoculation is placed in a biogas digester for anaerobic fermentation. The fermentation temperature is 35 ° C, and the pH of the fermentation is The value is 7.5, gas production starts on the 3rd day, and the generated gas is collected by drainage collection method. The gas production was measured once a day, and the gas production was completed on the 20th day.

[0048] The gas production calculated by the present invention is 383.0mg / L;

[0049] The present invention uses a portable combustible gas detector SQJ-IA to measure the content of methane in the gas colle...

Embodiment 2

[0051] Add corn stalks and pig manure to the kitchen waste wastewater with 10% TS, 90% VS / TS, 5 g / L total carbon content, and 15 carbon-to-nitrogen ratio to obtain a mixed solution with a carbon-to-nitrogen ratio of 33:1 ;

[0052] Inoculate the concentrated sludge from the concentration tank of the sewage treatment plant into the mixed solution, the inoculum amount is 100%, and place the inoculated mixed solution in a biogas digester for anaerobic fermentation. The fermentation temperature is 55°C, and the fermentation pH When the value is 8.0, gas production starts on the 3rd day, and the generated gas is collected by drainage collection method. The gas production was measured once a day, and the gas production was completed on the 15th day.

[0053] The gas production calculated by the present invention is 300.2mL / g;

[0054] The present invention uses a portable combustible gas detector SQJ-IA to measure the content of methane in the gas collected once a day, and the res...

Embodiment 3

[0056] Glucose and waste mycelium were added to kitchen waste wastewater with 8% TS, 98% VS / TS, 9 g / L total carbon content, and a carbon-to-nitrogen ratio of 20 to obtain a mixture with a carbon-to-nitrogen ratio of 35:1. solution;

[0057] Add the manganese ion that is 0.07:1 with the mass ratio of nitrogen to the mixed solution, then inoculate the concentrated sludge from the concentration tank of the sewage treatment plant, the inoculation amount is 150%, and the mixed solution after the inoculation is placed in the biogas digester Anaerobic fermentation was carried out in the middle, the fermentation temperature was 60°C, and the pH value of the fermentation was 8.5. Gas production began on the 2nd day, and the generated gas was collected by drainage collection method. The gas production was measured once a day, and the gas production was completed on the 12th day.

[0058] The gas production calculated by the present invention is 398.0mL / g;

[0059] The present inventio...

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Abstract

The invention provides an anaerobic fermentation method of kitchen wastes and wastewater. The method comprises the following steps: (a) mixing the kitchen wastes and wastewater with a carbon source and a nitrogen source to obtain a mixed solution, wherein the mass ratio of carbon to nitrogen in the mixed solution is (30-40) to 1; (b) performing anaerobic fermentation on the mixed solution obtained from the step (a) to generate biogas. A study discovers that the kitchen wastes and wastewater contain higher content of soluble carbohydrate, protein and fat, the carbon content is higher, and the carbon-nitrogen ratio of the kitchen wastes and wastewater continues to be increased on the basis of higher carbon content, so that the anaerobic fermentation process can be conveniently conducted, the biogas yield can be increased, and the content of methane in the obtained biogas can be increased. An experimental result shows that the biogas yield is 383.0 mL / g and the content of methane in the obtained biogas can reach up to 85% in the method provided by the invention.

Description

technical field [0001] The invention relates to the technical field of kitchen waste treatment, in particular to a method for anaerobic fermentation of kitchen waste wastewater. Background technique [0002] Kitchen waste, commonly known as swill, is the domestic waste formed by residents in the process of production and consumption. The main components include rice and flour food residues, vegetables, animal and vegetable oils, meat and bones, etc. According to different sources, food waste can be divided into food waste and kitchen waste. The former is produced in restaurants, canteens and other catering industries, and has the characteristics of large production volume, multiple sources, and wide distribution; the latter mainly refers to the leftovers discarded in residents’ daily cooking, the amount is not as large as catering waste, and the cost of nitrogen collection and transportation is relatively high , have a certain impact on the daily life of residents. Food wa...

Claims

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Application Information

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IPC IPC(8): C12P5/02
CPCY02E50/30
Inventor 赵旭李芮岚
Owner CHENGDU HENGRUN HIGH NEW SCI & TECH
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