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Processing method and system of organic solid waste

A technology of organic solids and treatment methods, applied in the direction of bio-organic part treatment, organic fertilizer, organic fertilizer preparation, etc., can solve the problems of high energy consumption and insurmountability, achieve energy saving, shorten the treatment cycle, and reduce the probability of odor Effect

Inactive Publication Date: 2013-09-04
南京市生态环境保护科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this technical scheme, the wet heat hydrolysis step requires heating and pressurization, which consumes a lot of energy; the anaerobic fermentation and aerobic fermentation are carried out separately, and there is no joint use, and the respective problems of the two still cannot be overcome

Method used

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  • Processing method and system of organic solid waste
  • Processing method and system of organic solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0033] The method for treating organic solid waste in this embodiment includes the following steps:

[0034] The first step, after pulverizing the organic solid waste, control the moisture content to 40-60% by weight (preferably 50%), the carbon-to-nitrogen ratio to 20-30:1 (preferably 25:1), and the organic matter content to 20-60% % (preferably 40%); moisture content, carbon-nitrogen ratio, and organic matter content are all weight ratios;

[0035] Among them, the particle size of the crushed material is at most 5cm; the leachate is collected during crushing, and the water content of the crushed material is adjusted by using the leachate; the carbon-nitrogen ratio of the crushed material is increased by using straw, and the porosity of the material is adjusted. The carbon-to-nitrogen ratio of the pulverized material accelerates the initial reaction rate of anaerobic treatment and promotes the growth of microorganisms.

[0036] The following simple method can be used to judg...

application example 1

[0045] After crushing the organic waste, mix the organic waste, pig manure and straw in a ratio of 4:2:1. The indicators after mixing are shown in the table below:

[0046] indicators

Moisture content%

Organic matter%

Total Carbon %

Total Nitrogen %

carbon to nitrogen ratio

Mixture

57.03

51.13

29.66

1.36

21.81

reference indicator

40～60

20～60

—

—

20～30:1

[0047] Then respectively according to the treatment method of this embodiment (T1), the simple aerobic composting treatment (T2) containing microbial inoculum, and the various indicators of the obtained compost are consistent with the indicators of the "Urban Waste Agricultural Control Standard" (GB8172-87) The comparison is as follows:

[0048]

application example 2

[0050] For the same organic solid waste, simple aerobic composting treatment, simple anaerobic treatment, anaerobic treatment and then aerobic treatment, and the treatment method of this embodiment were respectively adopted, and the results are as follows:

[0051] (1) Simple aerobic composting takes at least 30 days, usually about 40 days, and consumes a lot of energy;

[0052] (2) Simple anaerobic treatment takes at least 2-3 months;

[0053] (3) It takes at least 40 days for anaerobic treatment and then aerobic treatment, usually about 50 days, and the energy consumption is low;

[0054] (4) The treatment method of this embodiment needs at least 30 days, usually about 40 days, and the energy consumption is lower than (1).

[0055] It can be seen that, compared with aerobic treatment, the treatment method of this embodiment has lower energy consumption, and can significantly shorten the treatment period compared with simple anaerobic treatment and first anaerobic treatment ...

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Abstract

The invention relates to a processing method and system of organic solid waste. The processing method comprises the following steps of: (1) controlling moisture content, carbon nitrogen ratio and the like of the organic solid waste after crushing the organic solid waste; (2) putting materials obtained in the step (1) into an anaerobic hydrolysis acidification reactor, carrying out anaerobic hydrolysis acidification, monitoring the temperatures and the pH of the materials, when the pH values of the materials are no longer lowered, terminating the anaerobic hydrolysis acidification, and regulating the pH values of the materials; and (3) putting the materials obtained in the step (2) into an aerobic reactor, carrying out aerobic composting processing, and terminating aerobic processing when the materials become thoroughly decomposed, so as to obtain thoroughly decomposed composts. The processing system comprises a crusher, a mixer, the anaerobic hydrolysis acidification reactor, a pH regulator, the aerobic reactor and a fertilizer collector which are sequentially connected. According to the processing method and the processing system, compared with the pure aerobic treatment, the energy consumption can be lowered; and compared with the pure aerobic treatment and a manner that anaerobic treatment and the aerobic treatment are sequentially carried out, the processing period can be remarkably shortened, and meanwhile, stink generated in the anaerobic process can be reduced.

Description

technical field [0001] The invention relates to an organic solid waste treatment method and a treatment system, belonging to the technical field of organic solid waste treatment. Background technique [0002] At present, the treatment technologies for organic solid waste are mainly aerobic composting and anaerobic fermentation. Among them, anaerobic treatment technology has the disadvantages of large area occupation, long processing time, easy to produce stench and insufficiently decomposed impurities in the product; Aerobic composting requires a large amount of oxygen, consumes a lot of electricity, and has higher operating costs. The loss of nitrogen is more than that of anaerobic treatment, which reduces the fertilizer efficiency. [0003] After searching, it was found that the Chinese invention patent application with application number 201210251786.5 (name: solid anaerobic and aerobic composting system and disposal method for organic waste and sludge) firstly performs a...

Claims

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Application Information

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IPC IPC(8): C05F17/00C05F17/02
CPCY02W30/40
Inventor 管蓓卜现亭陈鸣陈森
Owner 南京市生态环境保护科学研究院