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Sludge and kitchen waste combined biotransformation method

A kitchen waste and combined biological technology, applied in biological sludge treatment, sewage/sludge fertilizer, biological organic part treatment, etc., can solve the problems of low waste conversion rate, limited composting capacity, high cost input, and achieve simple technology, Easy operation and low cost effect

Inactive Publication Date: 2021-09-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strict control of the living environment of earthworms and the limited composting capacity, the use of earthworms to treat kitchen waste still has problems such as high cost input and low waste conversion rate.

Method used

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  • Sludge and kitchen waste combined biotransformation method
  • Sludge and kitchen waste combined biotransformation method
  • Sludge and kitchen waste combined biotransformation method

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Embodiment Construction

[0028] The specific implementation manners of the present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings.

[0029] (1) Raw material collection and pretreatment:

[0030] Get 80% fresh semi-solid sewage sludge (black, foul smell, high water content) from the collector of sewage treatment plant in Lin'an City, Zhejiang Province. In an open plastic container, it is manually turned over periodically to allow it to completely air-dry for a week, in which non-biodegradable components such as glass fragments, chewing gum, rubber bands, metal parts, and plastics are manually removed.

[0031] At the same time, kitchen waste was collected in the main canteen of Zhejiang University Zijingang Campus for one week. Since all types of kitchen waste will be centrally processed in the canteen, uniformly mixed food waste was used as a representative sample. The bony, meaty, and fatty waste (e.g., eggshells, bones, meat, on...

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Abstract

The invention relates to a garbage treatment technology, and aims to provide a sludge and kitchen garbage combined biotransformation method. The method comprises the following steps of: taking fresh semi-solid sewage sludge, and air-drying and sorting the fresh semi-solid sewage sludge; taking a kitchen waste mixture, and air-drying, stirring, and crushing the kitchen waste mixture into blocks; mixing the sludge and the kitchen garbage according to a mass ratio of 7: 3, and then putting the mixture into a pre-fermentation reactor for pre-fermentation; transferring the mixture into a vermicular reactor, adjusting the pH value, introducing adult earthworms, and carrying out earthworm composting under room temperature and dark conditions; and recycling the sludge kitchen garbage and earthworm excrement separated and recycled after composting. The method is low in cost, simple in technology, easy to operate and free of secondary pollution in the remediation process; the sludge rich in heavy metal is subjected to harmless treatment, and the heavy metals in the sludge are degraded; and the safety of the harvested wormcast can be guaranteed, and the wormcast can be used as a sustainable sludge kitchen garbage recycling system for a long time.

Description

technical field [0001] The invention relates to a novel combined biotransformation method of sludge and kitchen waste, which belongs to the technical field of waste treatment. Background technique [0002] With the growth of population and the acceleration of urbanization, the global annual fresh sludge production has reached 60 million tons. Sludge is a complex mixed pollutant including heavy metals and pathogens. Although it contains nutrients that can make plants grow efficiently, it also contains harmful substances of different pollution levels. Therefore, if the sludge is directly applied to the In soil or water, pollutants will cause harm to human and animal health through the food chain. At present, the sludge treatment methods are mainly landfill and soil application, but these methods will cause heavy metals, phenols, pathogens, and organic pollutants contained in the sludge to be released in the soil and air, resulting in extremely serious environmental secondary ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F15/00C05F17/05C05F17/40C05F17/80C02F11/02
CPCC05F3/00C05F17/05C05F17/40C05F17/80C02F11/02C05F7/00C05F9/00Y02W30/40
Inventor 李廷强杨肖娥比拉杜彭涛
Owner ZHEJIANG UNIV
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