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Resourceful treatment method for organic waste

A technology of organic waste and treatment method, which is applied in the field of organic waste resource treatment, can solve the problems of loss of feasibility, increase of process cost, complicated technical route, etc., to reduce chemical oxygen demand, reduce environmental pollution, reduce The effect of process cost

Active Publication Date: 2017-11-21
CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, the existing resource-based treatment methods have low economic benefits and rely heavily on government subsidies for waste treatment and disposal.
However, the existing technology for resource conversion of organic waste into medium-chain fatty acids has a relatively complicated technical route and requires additional ethanol, which greatly increases the process cost
This technology has almost lost the feasibility of being applied in practical engineering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Pour 25L corn steep liquor into a 25L cylindrical plastic reactor, and add 0.5% lactic acid bacteria strain activated bacterial liquid at the same time, the initial pH value in the plastic reactor is 6.8, the temperature is 30 ° C, and the stirring speed is 80r / min, after 3 days of lactic acid fermentation, the maximum concentration of lactic acid was 23747mg / L, and the pH dropped to 3.8. The fermentation broth is transferred to the sedimentation tank for solid-liquid separation, the solid waste residue is discharged, and the supernatant enters the adjustment tank through the storage tank, and then transferred to the 5L medium-chain fatty acid reactor. Clostridium IV is immobilized in the reactor, and the lactic acid in the raw material is consumed during the carbon chain extension process to maintain the pH value in the reactor within the range of 5.5-6.5. The temperature in the medium-chain fatty acid reactor is 30°C, and the hydraulic retention time (HRT) is 5 days. ...

Embodiment 2

[0024]Add 25L corn steep liquor into a 25L cylindrical plastic reactor, add 1% lactic acid bacteria freeze-dried powder, the initial pH in the plastic reactor is 6.8, the temperature is 30°C, and the stirring speed is 80r / min. During the 3-day lactic acid fermentation process, the maximum lactic acid concentration was 33741mg / L, and the pH dropped to 3.5. After solid-liquid separation, the fermentation broth enters a 5L medium-chain fatty acid biosynthesis reactor. The pH value of the reactor is maintained in the range of 5.5-6.5, and Clostridium IV is immobilized in the reactor. The temperature in the biosynthesis reactor was 30°C, and the hydraulic retention time (HRT) was 5 days. After one month of operation, the effluent concentration of medium chain fatty acid caproic acid was 15427mg / L.

Embodiment 3

[0026] Add 25L of fruit and vegetable waste into a 25L cylindrical plastic reactor, add 0.5% lactic acid bacteria freeze-dried powder, the initial pH in the plastic reactor is 7.0, the temperature is 30°C, and the stirring speed is 80r / min. During the 3-day lactic acid fermentation process, the maximum lactic acid concentration was 11568 mg / L, and the pH dropped to 4.0. After solid-liquid separation, the fermentation broth enters a 5L medium-chain fatty acid reactor. The pH value of the reactor is maintained in the range of 5.5-6.5, and Clostridium IV is immobilized in the reactor. The temperature in the reactor is 40°C, and the hydraulic retention time (HRT) is 5 days. After running for one month, the effluent concentration of medium-chain fatty acid caproic acid is 8258mg / L.

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Abstract

The invention relates to the technical field of treatment and resourceful utilization of organic waste and aims at providing a resourceful treatment method for organic waste. The resourceful treatment method can improve the economic benefits of fermentation products. According to the adopted technical scheme, the method includes the steps of lactic acid fermentation, carbon chain lengthening and medium-chain fatty acid extracting, wherein according to carbon chain lengthening, microorganisms for synthesizing medium-chain fatty acid are added for anaerobic fermentation; and the organic waste is biodegradable organic waste. The brand new organic waste treatment method is provided, in other words, the technology for synthesizing medium-chain fatty acid as the main product through coupling of organic matter hydrolysis lactic acid generating and carbon chain lengthening is provided. The principle of the technology is obviously different from a previous anaerobic biochemical treatment technology, harmlessness and stability of organic waste are achieved, meanwhile, medium-chain fatty acid which is easy to extract and has high economic benefits can be generated, organic matter such as ethyl alcohol does not need to be additionally added, the technological cost is greatly reduced, and the economic benefits of the technology are obviously reduced.

Description

technical field [0001] The invention belongs to the technical field of organic waste treatment and resource utilization, and in particular relates to a method for organic waste resource treatment. Background technique [0002] With the rapid development of the economy and the improvement of people's living standards, the amount of organic waste is increasing, such as kitchen and vegetable waste, garden waste and agricultural and animal husbandry waste. If it is not dealt with in time or improperly, it will pose a huge threat to social development, living environment and public health. At the same time, sustainable development is a common concern of governments all over the world, and the resourceful treatment of organic waste is the development direction and research hotspot of organic waste treatment and disposal. [0003] At this stage, in the resource treatment of organic waste, technologies such as anaerobic fermentation for biogas production, aerobic composting, anaero...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 朱晓宇陶勇贾佳梁程
Owner CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
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