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Aerobic composting method

An aerobic composting and composting technology, which is applied in the field of solid waste recycling, can solve the problems of long composting cycle, low efficiency, and slow community succession, so as to increase nitrogen content and fertilizer efficiency, improve the sanitary environment, and prevent nitrogen loss effect

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

Typically, community succession is slow during natural composting, resulting in longer composting cycles and lower efficiency

Method used

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  • Aerobic composting method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0032] In this example, the specific steps for rapid aerobic composting of excess sludge and corn stalks by using sewage from a food factory are as follows:

[0033] (1) Mixing: Mix the excess sludge and corn stalks from food factory sewage treatment in a ratio of 6:4. The moisture content of the excess sludge and stalks are 85% and 9% respectively, and then add the mixture of excess sludge and corn stalks The buffer substance composed of dipotassium hydrogen phosphate and potassium dihydrogen phosphate with a mass of 1%, the molar ratio of dipotassium hydrogen phosphate and potassium dihydrogen phosphate is 2.5:1, after mixing, put it into a composting reactor and keep stirring.

[0034] (2) Staged rapid aerobic composting: control the composting temperature at 35°C, compost for 24 hours, and the ventilation volume is 7.5m 3 / h, during the composting process, the pH dropped from 7.10 to 6.67; then the composting temperature was controlled at about 55°C, composting for 46 hour...

Embodiment 2

[0037] In this example, the specific steps for rapid aerobic composting of excess sludge and corn stalks by using sewage from 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. The moisture content of the excess sludge and stalks are 85% and 9% respectively, and then add the mixture of excess sludge and corn stalks The buffer substance composed of dipotassium hydrogen phosphate and potassium dihydrogen phosphate with a mass of 0.5%, the molar ratio of dipotassium hydrogen phosphate and potassium dihydrogen phosphate is 3:1, after mixing, put it into a composting reactor and keep stirring.

[0039] (2) Staged rapid aerobic composting: control the composting temperature at 35°C, compost for 24 hours, and the ventilation volume is 7.5m 3 / h, the pH dropped from 7.06 to 6.54 during the composting process; then the composting temperature was controlled at about 55°C, composting for 46 hours...

Embodiment 3

[0042] In this example, the specific steps for rapid aerobic composting of excess sludge and corn stalks by using sewage from a food factory are as follows:

[0043] (1) Mixing: Mix the remaining sludge and corn stalks from the food factory sewage treatment in a ratio of 6:4. The moisture content of the remaining sludge and straw is 85% and 9% respectively, and then add the remaining sludge and corn stalks The straw mixture is composed of 3% potassium hydrogen phosphate and potassium dihydrogen phosphate as a buffer substance, and the molar ratio of dipotassium hydrogen phosphate and potassium dihydrogen phosphate is 0.2:1. After mixing, put it into a compost reactor and keep stirring.

[0044] (2) Staged rapid aerobic composting: control the composting temperature at 35°C, compost for 24 hours, and the ventilation volume is 7.5m 3 / h, the pH drops from 6.96 to 6.5 during the composting process; then the composting temperature is controlled at about 55°C, composting for 46 hou...

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Abstract

The invention discloses an aerobic composting method, which comprises the following steps: adding a buffer substance to aerobic composting materials, mixing uniformly, placing the mixture into a composting reactor for staged aerobic composting, and then post-decomposing to obtain a fertilizer, wherein the buffer substance is a mixture of dipotassium hydrogen phosphate and potassium dihydrogen phosphate. By adding the buffer substance composed of dipotassium hydrogen phosphate and potassium dihydrogen phosphate into the composting raw materials, acidification of the rapid composting process canbe controlled, the microbial activity can be enhanced, the composting reaction rate can be accelerated, and the composting period can be shortened. Meanwhile, by adding dipotassium hydrogen phosphateand potassium dihydrogen phosphate during the aerobic composting process, the contents of potassium and phosphorus in the compost product can be increased. The method of the invention is of great significance for production of high-quality compost products.

Description

technical field [0001] The invention belongs to the technical field of solid waste recycling, and in particular relates to a method for controlling acidification in an aerobic composting process. 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. Using the excess sludge produced by the sewage treatment of food factories to produce bio-organic fertilizer can solve the above-mentioned pollution problems of exces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F17/00
CPCC05F17/20Y02W30/40
Inventor 李秀芬张云龙宋明淦齐希光程宇晖
Owner JIANGNAN UNIV
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