Method and apparatus for controlling secondary pollutants in biodrying of mixed domestic waste

Abstract

The invention relates to a method and apparatus for controlling secondary pollutants in biodrying of mixed domestic waste. The method comprises the following steps: (1) simple pretreatment; (2) stacking; (3) biodrying of waste; (4) back spraying of leachate; (5) drying, reflux and concentrated treatment of tail gas. The apparatus comprises a sealed reactor, a leachate collector, a ventilating system and a tail gas treating device, wherein, the leachate collector is respectively connected with a leachate collecting pipe and a spray pipe in the reactor through pipelines, the tail gas treating device comprises a tail gas recovering pipe, a drying box, a tail gas treating fan and a purifying means, the tail gas recovering pipe is connected with the drying box, the drying box is respectively connected with a ventilating fan and the tail gas treating fan, and the tail gas treating fan is connected with the purifying means through a pipeline. According to the invention, the leachate does not need to be treated individually; tail gas is collected in a totally enclosed environment, and the amount of tail gas to be treated is small; a low heating value of obtained dried waste is increased by 100%; the invention is widely applicable to mixed waste with high water content and enables resource values of burning and sorting of domestic waste to be improved.

Description

technical field [0001] The invention relates to a treatment method and device for domestic garbage, in particular to a method and device for controlling secondary pollutants from biological drying of mixed domestic garbage. Background technique [0002] Domestic waste can generally be divided into four categories: recyclable waste, kitchen waste, hazardous waste and other waste. The current treatment methods for domestic waste are usually landfill, incineration or composting. [0003] At present, the municipal solid waste in our country generally adopts the method of mixed collection. Among them, the water content of easily degradable organic waste such as kitchen waste is relatively high, usually around 50%, and even 70% in some areas. If this kind of mixed waste with high water content is directly landfilled, it will not only occupy a large amount of land area, but also produce a large amount of leachate and biogas during the landfill process. The treatment of leachate i...

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Problems solved by technology

[0008] Nevertheless, the existing domestic waste biological drying technology treatment cycle generally exceeds 15 days (Zhang D.Q., et al, Biodrying of municipal solid waste with high water content by aeration procedures regulation and inoculation, Bioresource Technology, 2008, 99: 8796 -8802), at the same time, odorous tail gas will be released during the treatment process, which will cause serious secondary pollution, easily cause conflicts with residents around the facility, and limit the application of biological drying technology

[0009] The secondary pollutants in the biological drying process mainly include leachate and drying tail gas, especially the tail gas with a large amount of malodorous gas, which is one of the main factors restricting the development of waste biological drying technology. If these factors are not controlled , it is easy to form relatively serious secondary pollution, and it is easy to cause conflicts with residents around the facility, which makes the implementation of this technology difficult.

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