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A method for preparing biogas from kitchen waste wastewater

A technology for kitchen waste and waste water, applied in waste fuel, anaerobic digestion treatment, etc., can solve the problems of low biogas rate and unfavorable conditions

Active Publication Date: 2016-01-13
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 rate of generating biogas by anaerobic fermentation of kitchen waste wastewater is low, which is not conducive to its due

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 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;

[0048] Add the manganese ion that is 0.0075:1 with the quality of food waste wastewater solid content in the mixed solution, then inoculate the concentrated sludge from the sewage treatment plant concentration pool, the inoculation amount is 50%, the mixed solution after inoculation Place it in a biogas digester for anaerobic fermentation, the temperature of the fermentation is 35°C, and the pH value of the fermentation is 7.5. Gas production begins on the 3rd day, and the generated gas is collected by the drainage collection method. The gas production was measured once a day, and the gas production was completed on the 20th day.

[0049] The gas production calculated by the present invention is 383.0mg / L, and the gas production from the 3rd da...

Embodiment 2

[0052] 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 ;

[0053] In the mixed solution, adding zinc ions with a mass ratio of 0.45:1 to the solid content of the kitchen waste wastewater, and then inoculating the concentrated sludge from the concentration tank of the sewage treatment plant, the inoculation amount is 100%, and the inoculated The mixed solution was placed in a biogas digester for anaerobic fermentation. The fermentation temperature was 55°C, and the pH value of the fermentation was 8.0. 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 15th day.

[0054] The gas production calculated by the present invention is 300.2mL / g, and the gas production from the 2nd d...

Embodiment 3

[0057] To TS is 8%, VS / TS is 98%, total carbon content is 9g / L, carbon-nitrogen ratio is 20 in kitchen waste wastewater, add and the mass ratio of described kitchen waste wastewater solid content is 0.3:1 Magnesium ion, obtain mixed solution;

[0058] Inoculate the concentrated sludge from the concentration tank of the sewage treatment plant into the mixed solution, the inoculum amount is 150%, and the mixed solution after inoculation is placed in a biogas digester for anaerobic fermentation. The fermentation temperature is 60°C, and the pH of the fermentation is The value is 8.5, gas production starts on the 2nd 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 12th day.

[0059] The gas production calculated by the present invention is 398.0mL / g, and the gas production from the second day to the sixth day accounts for 85% of the total gas production;

[0060] The pr...

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PUM

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Abstract

The invention provides a method for preparing biogas from kitchen wastes and wastewater. The method comprises the following steps: (a) mixing the kitchen wastes and wastewater with additives to obtain a mixed solution, wherein the additives are selected from one or more of sodium ions, potassium ions, calcium ions, magnesium ions, zinc ions and manganese ions; (b) performing anaerobic fermentation on the mixed solution obtained from the step (a) to obtain the biogas. A study discovers that one or more of the sodium ions, the potassium ions, the calcium ions, the magnesium ions, the zinc ions and the manganese ions can promote the activity of hydrogenogens, acetogens and methanogens in inoculated sludge, wherein the hydrogenogens and the acetogens can promote organic matters in the kitchen wastes and wastewater to be decomposed into acetic acid, hydrogen and carbon dioxide, and the methanogens can convert acetic acid and hydrogen into methane or carbon dioxide in an anaerobic digestion process; the methane production rate is increased due to relatively high activity of the hydrogenogens, the acetogens and the methanogens.

Description

technical field [0001] The invention relates to the technical field of kitchen waste treatment, in particular to a method for preparing biogas from 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 waste ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28
CPCY02E50/30
Inventor 赵旭李芮岚
Owner CHENGDU HENGRUN HIGH NEW SCI & TECH