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Method for producing organic fertilizer by using municipal sewage sludge

A technology for urban domestic sludge and organic fertilizer, which is applied in the field of composting and disposal, can solve problems such as restricting the direct utilization of agriculture, and achieve the effects of being beneficial to the protection of the ecological environment, good treatment effect and easy operation.

Inactive Publication Date: 2011-03-09
INST OF AGRI ENG TECH FUJIAN ACAD OF AGRI SCI +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the content of chemical pollutants in sludge limits the direct use in agriculture, and the utilization rate is usually less than half of the total amount of sludge. The application of treated sludge is also a problem to be solved.

Method used

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  • Method for producing organic fertilizer by using municipal sewage sludge
  • Method for producing organic fertilizer by using municipal sewage sludge
  • Method for producing organic fertilizer by using municipal sewage sludge

Examples

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Embodiment Construction

[0018] A kind of method that utilizes municipal domestic sludge to produce organic fertilizer, carries out according to the following steps:

[0019] 1) Mix 4 parts of municipal domestic sludge with 1 part of agricultural organic waste in a certain proportion, so that the C / N of the mixed material is 30±5, the pH value is 6.0~7.5, and the moisture content is 60%~70% ;

[0020] 2) Add high-temperature aerobic actinomycetes to the above-mentioned mixed material, stir well, and send it into the stacking tank with a forklift to build a stack;

[0021] 3) Forcibly inject hot air into the stockpile tank to heat up the stockpile quickly, and keep the stockpile temperature at 60°C±5°C under ventilated conditions for 7-10 days to complete a high-temperature fermentation;

[0022] Use hot air to force ventilation to heat up the stockpile quickly, creating conditions for rapid growth of high-temperature bacteria. During the propagation of high-temperature bacteria, they decompose organi...

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Abstract

The invention relates to a method for producing organic fertilizer by using municipal sewage sludge. In the method, the municipal sewage sludge is fermented for the second time to be prepared into agricultural organic fertilizer or is further processed to be prepared into biological organic fertilizer or organic-inorganic compound fertilizer, the municipal sewage sludge is composted to be harmless municipal sewage sludge, and then, the municipal sewage sludge is prepared into the organic fertilizer to be applied to the soil. The invention can effectively improve the soil fertility, improve the crop yield, realize the purpose of recycling resources and relieve the processing cost by using incomes, and has positive significance for treating and recycling municipal sewage sludge and promoting low carbon economy.

Description

technical field [0001] The invention relates to a composting disposal technology in which the heavy metal content of urban domestic sludge does not exceed the quality standard of organic fertilizer, and is particularly suitable for solving the problem of safe utilization of urban domestic sludge composting. Background technique [0002] Municipal domestic sludge is the waste of municipal domestic sewage treatment plants. It is rich in N, P, K and organic matter, and is a good source of organic fertilizer. Rational use of sludge in agriculture is of great significance to reduce the pressure of chemical fertilizer production, reduce energy consumption, reduce agricultural production costs, reduce chemical fertilizer pollution, increase organic fertilizer sources, maintain soil fertility, and achieve sustainable development. Since sludge contains a lot of pollutants (heavy metals, toxic organic substances and harmful organisms), if it is directly used as arable land, it will af...

Claims

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Application Information

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IPC IPC(8): C05F17/00C05F15/00
CPCY02W30/40
Inventor 林代炎吴飞龙叶美锋林鸿雁翁伯琦魏云华
Owner INST OF AGRI ENG TECH FUJIAN ACAD OF AGRI SCI
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