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Kitchen waste harmless and resourceful processing method

A technology of kitchen waste and treatment method, which is applied in biological sludge treatment, climate change adaptation, organic fertilizer, etc. Reduce processing load, reduce emissions, and realize the effect of recycling

Inactive Publication Date: 2019-08-09
NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional anaerobic fermentation treatment has low gas production rate, low sludge loading rate, and a large amount of biogas slurry, resulting in a large treatment load for sewage plants

Method used

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  • Kitchen waste harmless and resourceful processing method

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Such as figure 1 Shown is a harmless and resourceful treatment method for kitchen waste, including the following steps:

[0024] A. Sorting and removing impurities: Roughly select the collected fresh kitchen waste to remove metal, glass bottles, plastics and other debris to obtain coarse solids, and recycle the useful debris and useless debris incineration; the coarse solids are further sorted to obtain starch, protein, oil, etc.;

[0025] B. Crushing treatment: crush the obtained starch, protein, oil, etc. to obtain a mixture with a particle diameter of ≦6mm;

[0026] C. Oil-water separation: transport the obtained mixture to a centrifuge, and obtain the light phase, which is an oil-water mixture, and the heavy phase substance, which is an oil-water mixture after separation. Preferably, the water content of the light phase obtained in this ste...

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Abstract

The invention discloses a kitchen waste harmless and resourceful processing method. The method includes the steps of conducting sorting, impurity removing, smashing, oil-water separating and anaerobicfermentation, adding biogas slurry and sludge generated in anaerobic fermentation to PAM accounting for 1-3|%o of the absolute dry weight of the sludge, introducing the flocculated biogas slurry andsludge into a centrifugal machine to be dewatered, making one part of dewatered biogas slurry flow back into an adjusting pool, discharging the other part of dewatered biogas slurry to a sewage plant,and conditioning and modifying the centrifugally-dewatered sludge and biogas residues, adding the sludge and biogas residues into a plate-and-frame filter press to obtain filtrate and residues, making one part of filtrate flow back into the adjusting pool, discharging the rest of filtrate to the sewage plant, and conducting aerobic composting on the residues. The filtrate formed after the biogasresidues generated after anaerobic fermentation are dewatered and filter-pressed by a plate and frame flows back into an anaerobic fermentation tank, the activity of anaerobic methanogens can be improved, the gas yield is improved, meanwhile the generated filtrate can be recycled, the processing loads on the sewage plant are reduced, and the kitchen waste harmless and resourceful processing is realized to the maximum extent.

Description

technical field [0001] The invention relates to a method for harmless and resourceful treatment of kitchen waste, and belongs to the technical field of waste recycling. Background technique [0002] Kitchen waste, commonly known as swill, is the domestic waste formed by residents in the process of living consumption. It is easy to rot and deteriorate, emits foul smell, and spreads bacteria and viruses. At present, the main disposal methods of food waste include aerobic composting, anaerobic fermentation, incineration, landfill, etc. Due to the high moisture content, low relative calorific value and high salt content of food waste, it is not suitable to enter the incineration system. Landfill needs to occupy a large amount of land, and it is easy to cause secondary pollution to groundwater. Aerobic composting has problems such as long cycle, strong odor, and difficulty in product sales. [0003] Anaerobic fermentation technology is used to recover biogas as biomass energy wh...

Claims

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Application Information

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IPC IPC(8): C05F9/04C02F11/04
CPCC02F11/04C05F9/04Y02E50/30Y02P20/129Y02A40/20
Inventor 刘军张二杨宫建瑞常邦华戴昕高年林陆升启李植汶孟庆海刘彦奎
Owner NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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