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Method for reducing emission of ammonia methane gas during sewage sludge composting

A technology of sewage sludge and methane gas, which is applied in the field of agricultural composting to achieve simple operation, good environmental and economic benefits, and improve the quality of composting

Inactive Publication Date: 2016-06-22
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the composting process, especially the addition of chemical additives (superphosphate) and biological additives (bacteria) to sludge composting 4 and NH 3 The impact of the emission reduction effect has rarely been reported

Method used

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  • Method for reducing emission of ammonia methane gas during sewage sludge composting
  • Method for reducing emission of ammonia methane gas during sewage sludge composting
  • Method for reducing emission of ammonia methane gas during sewage sludge composting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The sludge used in the test was taken from the dewatered sludge without anaerobic digestion in the domestic sewage treatment plant (Xiaojiahe sewage treatment plant, Beijing), and the corn stalks were taken from the Shangzhuang Experimental Station of China Agricultural University. . Superphosphate was purchased from the market, and the bacterial agent was obtained from Beijing Wotu Tiandi Biotechnology Co., Ltd. Dewatered sludge and corn stalks were mixed evenly at a ratio of 85:15 by wet weight. Three treatments were set up in the test. In addition to the control, superphosphate was added in treatment 2, and the amount of superphosphate added was 3% of the total wet weight of compost raw materials. In treatment 3, superphosphate and bacterial agents were added at the same time. The addition amount is the same as that of treatment 2, and the addition amount of the composite functional bacterial agent is 0.1% of the wet weight of the compost material. When preparing c...

Embodiment 2

[0037] The difference from Example 1 is that the dewatered sludge and corn stalks are evenly mixed according to the wet weight ratio of 85:20. There were 3 treatments in the test. In addition to the control, calcium superphosphate was added in treatment 2. The amount of superphosphate added was 4% of the total wet weight of compost raw materials. In treatment 3, calcium superphosphate and bacterial agents were added at the same time. The addition amount is the same as that of treatment 2, and the addition amount of the composite functional bacterial agent is 0.2% of the wet weight of the compost material. When preparing compost raw materials, superphosphate and bacterial agents are evenly sprinkled on the mixture of sludge and corn stalks, and mixed several times to fully mix with the materials.

Embodiment 3

[0039] The difference from Example 1 is that the dewatered sludge and corn stalks are evenly mixed according to the wet weight ratio of 85:10. Three treatments were set up in the experiment. In addition to the control, superphosphate was added in treatment 2, and the amount of superphosphate added was 2% of the total wet weight of compost raw materials. In treatment 3, superphosphate and bacterial agents were added at the same time. The addition amount is the same as that of treatment 2, and the addition amount of the composite functional bacterial agent is 0.05% of the wet weight of the compost material. When preparing compost raw materials, superphosphate and bacterial agents are evenly sprinkled on the mixture of sludge and corn stalks, and mixed several times to fully mix with the materials.

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Abstract

The invention discloses a method for reducing emission of ammonia methane gas during sewage sludge composting.The method includes following steps: placing calcium superphosphate and fungicide into a sewage sludge composting material, mixing fully, and composting, wherein adding quantity of calcium superphosphate is 2-4% of wet weight of the composting material, adding quantity of the fungicide is 0.05-0.2% of the wet weight of the composting material; placing corn straw into the sewage sludge composting material, and a weight ratio of the sewage sludge composting material to the corn straw is 85:10-20.A continuous forced ventilation mode is adopted for composting, and ventilation rate is 0.15-0.25 L.kg-1 DM.min-1.The method has the advantages of low cost, wide application range and simple operation, emission of ammonia and methane gas is reduced remarkably during sewage sludge composting, emission reducing rate of ammonia emission can reach 63%, and emission reducing rate of methanol can reach 70%; nutrition content in a composting product can be increased, composting quality can be improved, and the method has popularization value.

Description

technical field [0001] The invention relates to the technical field of agricultural composting, and more specifically relates to a method for reducing ammonia gas and methane gas emissions during the composting process of sewage sludge. Background technique [0002] Sewage sludge, as a by-product of activated sludge treatment of sewage, is essentially a semi-solid waste. With the increase of sewage treatment volume, it will inevitably lead to the continuous increase of sludge production. At present, most of the sludge in our country has not been properly treated and disposed of, and the phenomenon of random discarding and dumping is common, which not only occupies a large amount of land, but also causes serious secondary pollution. Therefore, finding a safe and reliable sludge treatment and disposal method has become an urgent problem to be solved. Sludge composting is an important means of making sludge harmless, reducing and recycling sludge. Aerobic composting can conve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05F7/00C05G1/00
CPCC05B1/02C05F7/00C05F11/08C05F11/00Y02A40/20Y02E50/30Y02W30/40
Inventor 李国学袁京陈是吏张地方杜龙龙何胜洲
Owner CHINA AGRI UNIV
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