Method for rapid aerobic composting

An aerobic composting and rapid technology, which is applied in the field of solid waste recycling, can solve problems such as long time consumption, and achieve the effects of reducing farmland environmental pollution, speeding up composting reaction speed, and saving composting costs.

Inactive Publication Date: 2019-01-11
JIANGNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for fast aerobic composting, which solves the time-consuming problem of the existing composting method

Method used

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  • Method for rapid aerobic composting

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Effect test

Embodiment 1

[0037] In this embodiment, the specific steps for rapid aerobic composting of residual sludge and corn stalks (with a particle size of 1 to 5 mm) after sewage treatment in a food factory are as follows:

[0038] (1) Mixing: Mix the excess sludge and corn stalks from food factory sewage treatment in a ratio of 6:4. / N) ratio is 25, moisture content is 60%, puts into the composting reactor after mixing, and keeps stirring.

[0039] (2) Staged aerobic composting: the composting temperature is controlled at 35°C, and the ventilation rate is 5.5m 3 / h, composting for 12h; then, the composting temperature is controlled at 55°C, and the ventilation rate is 10m 3 / h, composting for 58h; finally, the composting temperature is controlled at 65°C, and the ventilation rate is 5.5m 3 / h, composting 2h. At the end, the material seed germination index was 74.58%, basically decomposed.

[0040] (3) Post-decomposition: take out the material after the staged aerobic composting, adjust the mo...

Embodiment 2

[0042] In this embodiment, the specific steps for rapid aerobic composting of excess sludge and corn stalks (with a particle size of 1 to 5 mm) by using sewage from a food factory are as follows:

[0043] (1) Mixing: Mix the remaining sludge and corn stalks from the sewage treatment of food factories in a ratio of 9:1. The moisture content of the remaining sludge and corn stalks is 80% and 12% respectively, so that the carbon and nitrogen of the compost raw materials ( C / N) ratio is 15, moisture content is 55%, puts into composting reactor after mixing, and keeps stirring.

[0044] (2) Staged aerobic composting: the composting temperature is controlled at 30°C, and the ventilation rate is 3.5m 3 / h, compost for 24h; then, control the compost temperature at 60°C, and the ventilation rate is 12m 3 / h, composting for 47h; finally, the composting temperature is controlled at 75°C, and the ventilation volume is 3.5m 3 / h, composting 1h. At the end, the material seed germination ...

Embodiment 3

[0047] In this embodiment, the specific steps for rapid aerobic composting of excess sludge and corn stalks (with a particle size of 1 to 5 mm) by using sewage from a food factory are as follows:

[0048] (1) Mixing: Mix the excess sludge and corn stalks from food factory sewage treatment in a ratio of 5:5. / N) ratio is 30, moisture content is 65%, puts into the composting reactor after mixing, and keeps stirring.

[0049] (2) Stage-by-stage aerobic composting: the composting temperature is controlled at 40°C, and the ventilation rate is 7.5m 3 / h, composting for 10h; then, control the composting temperature at 50°C and the ventilation volume at 7m 3 / h, composting for 59h; finally, the composting temperature is controlled at 60°C, and the ventilation rate is 3.5m 3 / h, composting 3h. At the end, the material seed germination index was 68.72%, basically decomposed.

[0050] (3) Post-decomposition: take out the material after the staged aerobic composting, adjust the moistu...

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Abstract

The invention discloses a method for rapid aerobic composting, comprising the following steps: uniformly mixing excess sludge after sewage treatment with straw, placing the mixture in a composting reactor for segmental aerobic composting, and then post-decomposing to obtain a fertilizer, wherein the segmented aerobic composting includes a medium temperature stage, a high temperature stage and a harmless stage. In the medium temperature stage, the composting temperature is controlled to 30-40 DEG C, and the composting time is 10-24 hours; in the high temperature stage, the composting temperature is controlled to 50-60 DEG C and the composting time is 46-60 h; and in the harmless stage, the composting temperature is controlled to 60-75 DEG C, and the composting time is 1-3 h. By the segmented aerobic composting, the composting reaction speed can be accelerated, and the time of composting compost materials is shortened to 72 hours. Thereby, composting cost is greatly saved, and the sanitary environment is remarkably improved. In addition, the segmented aerobic composting method can help realize thorough harmlessness of composting and eliminate secondary pollution of decomposing. Decomposed materials are odorless and tasteless, forced ventilation is not required, and the post-decomposing process is greatly simplified.

Description

technical field [0001] The invention belongs to the technical field of solid waste recycling, and in particular relates to a rapid aerobic composting method. technical background [0002] The residual sludge of food factory sewage treatment has high organic content, mostly protein, polysaccharide, fat and cellulose, etc., does not contain toxic and harmful substances, and has the following characteristics: high moisture content, which can reach 80% to 90%, resulting in , The transportation and treatment process is difficult; the sludge leachate piled up for a long time will pollute surface water, groundwater and soil through surface runoff and soil infiltration; the content of organic matter is high, above 95%, and its calorific value is low. Rich, perishable and stinking. [0003] According to statistics, there are nearly 20 kinds of crop straws in my country, with an annual output of about 7.0×10 8 t, accounting for about 25% of the world's total straw, of which, rice st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F15/00C05F17/00
CPCC05F7/00C05F17/00C05F11/00C05F11/08Y02W30/40
Inventor 李秀芬宋明淦张云龙齐希光
Owner JIANGNAN UNIV
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