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A method for harmless treatment of kitchen waste

A technology for harmless treatment of food waste, applied in chemical instruments and methods, sludge treatment, sedimentation treatment, etc., can solve the problems of long time-consuming treatment of food waste, slow digestion rate, low yield of hydrothermal charcoal, etc. problem, to achieve the effect of improving improvement ability, uniform size, and improving anaerobic digestibility

Active Publication Date: 2022-03-22
湖南三五二环保科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent 201811082592.0 discloses a method of hydrothermal carbonization coupled with anaerobic digestion to treat food waste. The technical solution is to directly carry out hydrothermal carbonization reaction on the pulverized food waste, which leads to hydrothermal charcoal produced by hydrothermal carbonization reaction. The yield is low, and the carbonaceous substances in the kitchen waste cannot be effectively converted into hydrothermal charcoal at the maximum conversion rate, and the obtained hydrothermal charcoal, hydrothermal liquid, or a mixture of the two is subjected to anaerobic digestion When the hydrothermal charcoal and hydrothermal liquid have been treated at high temperature, the microorganisms contained in the kitchen waste have been killed, and the anaerobic digestion of hydrothermal charcoal, hydrothermal liquid, or a mixture of the two has a slower digestion rate , Food waste treatment takes too long

Method used

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  • A method for harmless treatment of kitchen waste
  • A method for harmless treatment of kitchen waste
  • A method for harmless treatment of kitchen waste

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Experimental program
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Effect test

Embodiment 1

[0036] see Figure 1-2 , is a kind of food waste harmless treatment method of the present invention, comprises the following steps:

[0037] 1) Sorting the collected kitchen waste by using the sorting device 1 to sort the coarse solid waste, and using the screen 2 to screen out the silt and gravel;

[0038] 2) the mixture obtained in step 1) is transferred to the first primary sedimentation tank 3 for sedimentation;

[0039]3) Transfer the first primary sedimentation supernatant obtained after the primary sedimentation in the first primary sedimentation tank 3 in step 2) to the aeration tank 4, and transfer the first primary sedimentation sludge obtained after the primary sedimentation to the second primary sedimentation tank Settling in the primary sedimentation tank 5;

[0040] 4) The sludge obtained by mixing the aeration supernatant liquid aerated in step 3) through the aeration tank 4 and the second primary sedimentation supernatant liquid obtained after the second prim...

Embodiment 2

[0046] see figure 1 , image 3 , a method for harmless treatment of kitchen waste provided by the present invention, comprising the following steps:

[0047] 1) Sorting the collected kitchen waste by using the sorting device 1 to sort the coarse solid waste, and using the screen 2 to screen out the silt and gravel;

[0048] 2) the mixture obtained in step 1) is transferred to the first primary sedimentation tank 3 for sedimentation;

[0049] 3) Transfer the first primary sedimentation supernatant obtained after the primary sedimentation in the first primary sedimentation tank 3 in step 2) to the aeration tank 4, and transfer the first primary sedimentation sludge obtained after the primary sedimentation to the second primary sedimentation tank Settling in the primary sedimentation tank 5;

[0050] 4) The sludge obtained by mixing the aeration supernatant liquid aerated in step 3) through the aeration tank 4 and the second primary sedimentation supernatant liquid obtained af...

Embodiment 3

[0056] see figure 1 , image 3 , a method for harmless treatment of kitchen waste provided by the present invention, comprising the following steps:

[0057] 1) Sorting the collected kitchen waste by using the sorting device 1 to sort the coarse solid waste, and using the screen 2 to screen out the silt and gravel;

[0058] 2) the mixture obtained in step 1) is transferred to the first primary sedimentation tank 3 for sedimentation;

[0059] 3) Transfer the first primary sedimentation supernatant obtained after the primary sedimentation in the first primary sedimentation tank 3 in step 2) to the aeration tank 4, and transfer the first primary sedimentation sludge obtained after the primary sedimentation to the second primary sedimentation tank Settling in the primary sedimentation tank 5;

[0060] 4) The sludge obtained by mixing the aeration supernatant liquid aerated in step 3) through the aeration tank 4 and the second primary sedimentation supernatant liquid obtained af...

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Abstract

The invention discloses a harmless treatment method for kitchen, which includes sorting and screening out coarse solids and gravel in collected kitchen waste, settling in a first primary sedimentation tank, aeration in an aeration tank, and second primary sedimentation tank. Waste activated sludge and primary sewage sludge are obtained after settling in the settling tank, and the waste activated sludge is hydrothermally carbonized after being centrifuged to obtain wet hydrothermal charcoal and hydrothermal carbonization liquid. The carbonization liquid and the primary sewage sludge are transferred to the leachate bed reactor for anaerobic digestion reaction to obtain biogas that can be used as a new energy source. The wet hydrothermal carbon can be used as a high-energy and environmentally friendly biogas after being dried by a solar dryer. Biofuel energy. The invention provides a hydrothermal charcoal with higher phosphorus content and higher yield, and improves the digestibility in the anaerobic digestion process, thereby reducing the residual amount of digested residue, and can be obtained as a biological charcoal after harmless treatment. Hydrothermal charcoal and biogas as fuel energy are used for energy recycling.

Description

technical field [0001] The invention relates to the technical field of sewage sludge treatment, in particular to a harmless treatment method for kitchen waste. Background technique [0002] Kitchen waste, commonly known as swill, also known as swill, swill, etc., is mainly produced in the catering industry, canteens and households. It mainly refers to the highly perishable domestic waste generated by people's eating behavior. Compared with other garbage, it has the characteristics of high content of water, oil and inorganic salt. Food waste accounts for a large proportion of urban domestic waste. Because food waste is a "high-quality culture medium for harmful organisms produced by human beings", it is very easy to spontaneously breed mosquitoes, flies, and bacteria, producing toxic, odorous, and flammable gases, which brings fire hazards and environmental and public health issues. Improper use of waste oil and swill from food waste is extremely harmful. Food waste is a re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02C02F11/10C02F11/04C02F11/127C10L5/46C10B53/00
CPCC02F9/00C02F11/10C02F11/04C02F11/127C10L5/46C10B53/00C02F1/00C02F2001/007C02F7/00C02F2301/08Y02E50/10Y02E50/30
Inventor 谢耀明
Owner 湖南三五二环保科技有限公司
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