Method for cooperative treatment of kitchen waste, household waste and sewage plant sludge

Abstract

The invention discloses a method for cooperative treatment of kitchen waste, household waste and sewage plant sludge. Solid-phase material obtained after solid-liquid separation of the kitchen waste is subjected to a household waste incineration step, so that the solid-phase material of the kitchen waste is subjected to incineration power generation together with the household waste; and oil-watermixed liquid obtained after solid-liquid separation of the kitchen waste is selectively mixed with the sludge, so that the heat value and the fluidity of a sludge mixture are effectively controlled,and the sludge is ensured to be smoothly dried and incinerated. The heat value of the sludge is improved, the use amount of natural gas for sludge drying and incinerating can be saved, and the energy-saving effect is achieved; and meanwhile, the problem that a leachate membrane is blocked due to kitchen and household waste mixed fermentation grease is solved, and moreover, water phases obtained after grease is separated from kitchen waste liquid phases is good in biodegradability, so that cooperative treatment together with leachate of the household waste is facilitated. The oil-water mixed liquid separated from the kitchen waste through a solid-liquid separation device is subjected to dry combustion to be removed after being mixed with the sludge, anaerobic fermentation treatment is not needed, and water resources are effectively saved.

Description

technical field [0001] The invention relates to a method for solid waste treatment, in particular to a method for collaborative treatment of kitchen waste, domestic waste and sewage plant sludge. Background technique [0002] At present, with the implementation of waste classification in China, solid waste such as municipal solid waste, kitchen waste, and municipal sludge after classification is the main waste that needs to be treated in urban solid waste. However, the current construction speed of solid waste treatment facilities in various cities Failure to keep up with the growth rate of solid waste will cause solid waste siege or illegal disposal. The construction of waste incineration facilities, kitchen waste treatment facilities, and sludge incineration facilities is usually unable to land due to the "NIMBY effect". The following are the main treatment technologies for domestic waste, kitchen waste and municipal sludge: [0003] (1) The main treatment technologies f...

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Problems solved by technology

[0009] In order to solve the technical problem that the existing food waste, domestic waste and sewage plant sludge cannot be well coordinated, the present invention proposes a method for synergistic treatment of food waste, domestic waste and sewage plant sludge. The solid-phase material after the solid-liquid separation of the kitchen waste is subjected to the domestic waste incineration step, so that the solid-phase material of the kitchen waste is incinerated together with the domestic waste to generate electricity; at the same time, the oil-water mixture after the solid-liquid separation of the kitchen waste is mixed with the sewage The municipal sludge in the treatment plant is selectively mixed, so as to effectively control the calorific value and fluidity of the sludge mixture, and ensure the smooth drying and incineration of the sludge; moreover, the solid-liquid separation device from the kitchen waste is separated The oil-water mixture is mixed with sludge and then dried and burned without anaerobic fermentation treatment, effectively saving water resources

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