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Method for composing sludge by adding mineralized waste

A technology of mineralized garbage and composting method, which is applied in the field of resource utilization of organic waste, to achieve the effects of reducing investment, improving fertilizer efficiency, and reducing costs

Inactive Publication Date: 2013-08-14
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the treatment and disposal of mined mineralized waste also faces some social and environmental problems.

Method used

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  • Method for composing sludge by adding mineralized waste
  • Method for composing sludge by adding mineralized waste

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Experimental program
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Embodiment

[0025] The crop straw was pulverized to 2-4cm, and its moisture content was 13.58%, and the C / N ratio was 81.32. The moisture content of the sludge from the sewage treatment plant was 83.19%, and the C / N ratio was 11.29. was 26.53%, and C / N was 16.21. Mix the sludge, crop straws and mineralized garbage uniformly according to the following requirements, so that the mineralized garbage content is 15.21% (dry weight), the moisture content is 63.21%, and the C / N is 25.1, and then the mixed material is loaded into the composting reaction After the warehouse is installed, the surface layer is flattened, and then 5cm thick mineralized waste is laid on it, and the oxygen supply is forced to ventilate at a rate of 0.4L / (min.kg). When the oxygen concentration at the outlet is higher than 18%, the oxygen supply is stopped. Oxygen supply was started when the outlet oxygen concentration was lower than 10%, and the fermentation was completed in 17 days. Take the material out of the compost...

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Abstract

The invention discloses a method for composing sludge by adding mineralized waste. The method mainly comprises the following steps of: A) uniformly mixing straw, sludge and mineralized waste, adjusting water content to be 45 to 65 mass percent, spreading, paving a layer of mineralized waste on the surface of mixture, and performing primary composing fermentation in a forced ventilation and oxygensupply mode; and B) uniformly mixing the lower layer of compost and the upper layer of the mineralized waste which are obtained after fermentation again, adjusting the water content to be 45 to 50 mass percent, performing secondary fermentation, and turning until the compost is thoroughly decomposed. The sludge and the mineralized waste are treated simultaneously by treatment of wastes with processes of wastes against one another and cooperative control, and the compost is recycled. Moreover, according to the method, the mineralized waste is used as microbial inoculant and a nitrogen conservation material for sludge composing, so the nitrogen content in a compost product is improved simultaneously in the process of accelerated composing fermentation, the composing cost is reduced, and thequality of the compost product is improved.

Description

technical field [0001] The invention belongs to the technical field of organic waste resource utilization, and in particular relates to a sludge composting method for adding mineralized waste. Background technique [0002] With the rapid development of society and economy and the continuous improvement of urbanization level, the discharge of industrial sewage and domestic sewage is increasing, and the sludge output of sewage treatment plants has increased sharply. Relevant data show that in 2006, the urban sludge produced by urban sewage treatment plants in my country has reached 15 million tons (with a moisture content of 80%), which is 8% of the volume of domestic garbage removed. Urban sludge is generally rich in N, P, K and other nutrients required for plant growth and development, as well as a large amount of organic matter and harmful microorganisms such as pathogenic bacteria. Therefore, urban sludge must be stabilized and harmless. to be applied to the soil. Compos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05F17/00
CPCY02W30/40
Inventor 席北斗何小松姜永海李丹张进保潘红卫
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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