Method for improving resource utilization of kitchen waste

A food waste and recycling technology, applied in the direction of fermentation, etc., can solve the problems of key influencing factors and unclear mechanism of action, and achieve the effects of shortening anaerobic fermentation time, reducing solid content rate, and accelerating material transfer

Inactive Publication Date: 2019-07-23
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the use of linear alkylbenzene sulfonate in detergents to improve the resource utilization of food waste, and its key influencing factors and mechanism of action are not clear

Method used

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  • Method for improving resource utilization of kitchen waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) In a plexiglass reactor with a working volume of 600mL, add pulverized and pulped food waste and sludge mixture (based on TSS, the mass ratio of food waste to sludge is 90:10) and manually configured washing Waste water (concentration of linear alkylbenzene sulfonate in waste water is 10mg / L), the total volume of the fermentation system obtained is 300mL, wherein TSS is 29g / L.

[0020] (2) Fill the reactor with nitrogen and drive oxygen for 10 minutes, seal the reactor, and use mechanical stirring to mix the substances in the fermentation system evenly; through the mixed anaerobic fermentation of washing wastewater and kitchen waste, the organic matter is converted into SCFAs. Among them, the mechanical stirring speed is 150-180rpm / min; the fermentation reaction temperature is controlled at 35±1°C, and the pH value is not controlled.

[0021] Calculated by CODcr, the accumulation of SCFAs reached 1820mg / L on the 6th day.

Embodiment 2

[0023] (1) In a plexiglass reactor with a working volume of 600mL, add pulverized and pulped food waste and sludge mixture (based on TSS, the mass ratio of food waste to sludge is 90:10) and manually configured washing Waste water (concentration of linear alkylbenzene sulfonate in waste water is 20mg / L), the total volume of the fermentation system obtained is 300mL, wherein TSS is 29g / L.

[0024] (2) Fill the reactor with nitrogen and drive oxygen for 10 minutes, seal the reactor, and use mechanical stirring to mix the substances in the fermentation system evenly; through the mixed anaerobic fermentation of washing wastewater and kitchen waste, the organic matter is converted into SCFAs. Among them, the mechanical stirring speed is 150-180rpm / min; the fermentation reaction temperature is controlled at 35±1°C, and the pH value is not controlled.

[0025] Calculated by CODcr, the accumulation of SCFAs reached 3473mg / L on the 6th day.

Embodiment 3

[0027] (1) In a plexiglass reactor with a working volume of 600mL, add pulverized and pulped food waste and sludge mixture (based on TSS, the mass ratio of food waste to sludge is 90:10) and manually configured washing Waste water (concentration of linear alkylbenzene sulfonate in waste water is 50mg / L), the total volume of the fermentation system obtained is 300mL, wherein TSS is 29g / L.

[0028] (2) Fill the reactor with nitrogen and drive oxygen for 10 minutes, seal the reactor, and use mechanical stirring to mix the substances in the fermentation system evenly; through the mixed anaerobic fermentation of washing wastewater and kitchen waste, the organic matter is converted into SCFAs. Among them, the mechanical stirring speed is 150-180rpm / min; the fermentation reaction temperature is controlled at 35±1°C, and the pH value is not controlled.

[0029] Calculated by CODcr, the accumulation of SCFAs reached 10364mg / L on the 4th day.

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Abstract

The invention discloses a method for improving the resource utilization of kitchen waste. The method comprises the following steps: (1) grinding and pulping kitchen waste to obtain an anaerobic fermentation substrate; (2) adding civil sludge into the substrate to serve as an inoculating microbe; (3) diluting the fermentation substrate with washing wastewater containing linear alkyl benzene sulfonates to obtain a fermentation system; and (4) performing oxygen removal and sealing on the fermentation system, and performing anaerobic fermentation. The method can improve the characteristics of kitchen waste by adding washing wastewater to realize resource utilization and recycling of the kitchen waste and the like and is favorable to reduction and harmless disposal of washing wastewater and kitchen waste; furthermore, relative to clean water, such as tap water, kitchen waste is diluted with washing wastewater, the solid content of the kitchen waste is reduced, and the treatment cost can bereduced; and the linear alkyl benzene sulfonates can be used for promoting dissolution of complex organic substances and increasing the generation rate and yield of short-chain fatty acids, the anaerobic fermentation time can be remarkably shortened, and the operation cost can be reduced.

Description

technical field [0001] The invention relates to a garbage treatment method, in particular to a method for improving resource utilization of kitchen garbage, and belongs to the technical field of environmental protection. Background technique [0002] Food waste is mainly produced in dining places such as restaurants, canteens, hotels, and households. With the rapid development of cities, the output of kitchen waste is increasing continuously. Taking China as an example, the current food waste is growing at a rate of 10% per year, accounting for 40-50% of urban solid waste. In 2020, the annual output of food waste in my country is expected to reach 1.4×10 8 tons, and its organic matter energy is equivalent to 10 million tons of coal. Therefore, in order to avoid its potential environmental pollution risk and huge waste of resources, the effective treatment of food waste has attracted widespread attention in recent years. [0003] There are many ways to deal with food waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/54C12P7/52C12P7/40
CPCC12P7/40C12P7/52C12P7/54
Inventor 罗景阳曹淼朱莹章钦吴瑒冯骞方芳操家顺
Owner HOHAI UNIV
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