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Composting method using rectorite as accessory material

A composting method and rectorite technology, applied in the field of sludge aerobic composting, can solve the problems of poor air permeability and porosity of materials, failure to reduce heavy metal content, high amount of auxiliary materials, etc., to achieve uniform composting fermentation process and low operating costs Inexpensive, improves air circulation

Inactive Publication Date: 2017-03-22
武汉正清和环保科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a composting method using rectorite as an auxiliary material, aiming to solve the problems of poor air permeability and looseness of materials in the current sludge composting fermentation process, inability to reduce heavy metal content, high auxiliary material consumption, and high cost

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  • Composting method using rectorite as accessory material

Examples

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Effect test

Embodiment l

[0041] Sampling and analysis of dewatered sludge from a sewage plant (domestic sewage) in a city in Hubei shows that the basic properties of the sludge are: moisture content 78%, total organic matter 540g / kgDM, water-soluble total nitrogen 3.1g / kgDM, coliform value ≥ 23,000MPN / kgDM. Then add sawdust with a water content of about 10% and vermiculite with a specification of 3.1-3.5 cm as auxiliary materials, and the added amount is 20% and 5% of the weight of the sludge respectively. Put the above materials into the automatic mixing system. Control the weight of the return material to be 25% of the weight of the sludge. Then stir, so that the fermentation dominant bacteria are evenly mixed into the material system. Pour it into the fermentation tank, stack it in the form of strips and stir it directionally for 30 minutes every 12 hours, and discharge it after 18 days of treatment, and the weight of the material is reduced by 39.5%. The value of the coliform group in the detec...

Embodiment 2

[0043] Sampling and analysis of dewatered sludge from a sewage plant (domestic sewage) in a city in Hubei shows that the basic properties of the sludge are: moisture content 77%, total organic matter 590g / kgDM, water-soluble total nitrogen 3.3g / kgDM, coliform value ≥ 23,000MPN / kgDM. Then add wood chips with a moisture content of about 10% and sintered rectorite with a specification of 3.1-3.5 cm as auxiliary materials, and the addition amounts are 20% and 10% of the weight of the sludge respectively. Put the above materials into the automatic mixing system. Control the weight of the return material to be 20% of the weight of the sludge. Then stir, so that the fermentation dominant bacteria are evenly mixed into the material system. Pour it into the fermentation tank, stack it in the form of strips and stir it directionally for 30 minutes every 12 hours, and discharge it after 18 days of treatment, and the weight of the material is reduced by 41.3%. The value of the coliform...

Embodiment 3

[0045] Sampling and analysis of dewatered sludge from a sewage plant (domestic sewage) in a city in Hubei shows that the basic properties of the sludge are: moisture content 80%, total organic matter 550g / kgDM, water-soluble total nitrogen 3.2g / kgDM, coliform value ≥ 24,000MPN / kgDM. Then add sawdust with a moisture content of about 10% and two conditioners such as the sintered rectorite of Example 1 as auxiliary materials, and the additions are respectively 15% and 15% of the weight of the sludge. Put the above materials into the automatic mixing system. Control the weight of the return material to be 20% of the weight of the sludge. Then stir, so that the fermentation dominant bacteria are evenly mixed into the material system. Transfer to the fermentation tank and pile up in the form of strips. Directional stirring for 30 minutes every 12 hours, after 18 days of treatment, the material was discharged, and the weight of the material was reduced by 40.5%. The value of the ...

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Abstract

The invention discloses a composting method using rectorite as an accessory material. The composting method comprises the following steps: adding 10 to 20% of wood chip and straw and 5 to 15% of sintered rectorite in the process of composting and pretreatment of sludge and allowing the water content of the initial materials mixed under stirring to be 60%; controlling turning frequency and aeration rate of composting; and after completion of composting, carrying out screening to form a composting product-organic matrix with uniform particle sizes and separating rectorite from soil for cyclic usage. The sintered rectorite applied to composting has the advantages of adsorptivity, ion exchange performance, air permeability, low loss and repeated usability; the composting product obtained in the invention is high in decrement rate; the utilization efficiency of composting cabins is high; the composting product is loose and is easy to separate; a composting period is shortened by 1 / 4; operation cost is reduced; economic benefits are increased; and the method is extensively applicable to aerobic composting of a variety of sludges.

Description

technical field [0001] The invention belongs to the technical field of aerobic composting treatment of sludge, and in particular relates to a composting method using rectorite as an auxiliary material. Background technique [0002] With the acceleration of urbanization in my country, the amount of urban sewage treatment is also increasing. Sludge is an accompanying organism of sewage treatment, usually accounting for 0.5--1% of the sewage treatment volume. Due to its complex composition, it contains not only a large amount of organic matter, but also pathogenic microorganisms, heavy metals, etc. It is difficult to handle and dispose of, and the risk of stacking is high. Therefore, how to safely, economically and rationally dispose and utilize sludge from sewage treatment plants has always been a research topic of great concern to all countries in the world today. At present, the disposal methods of municipal sludge include incineration, sanitary landfill and land utilizatio...

Claims

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Application Information

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IPC IPC(8): C05F15/00C05F17/00
CPCC05F7/00C05F17/80C05F11/00C05F11/08Y02W30/40
Inventor 桂厚瑛周秋名
Owner 武汉正清和环保科技开发有限公司
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