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Method for sludge composting using new regulator

A technology for conditioner and sludge, applied in the field of sludge aerobic composting process, can solve the problems of not being able to play a supporting role, the source of wood chips conditioner is difficult, and it cannot be recycled, etc., so as to save air supply time and operation. Low-cost, easy-to-separate effects

Inactive Publication Date: 2008-11-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional conditioners such as sawdust, straw, rice husk, etc. decompose during the composting process and lose their water absorption capacity, so they cannot play a supporting role, but can only be used once and cannot be recycled.
Moreover, with the increasing amount of sludge treatment, the source of wood chip conditioners has become a major problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First, the dewatered sludge of a sewage plant in Shanghai (domestic sewage and a small amount of food wastewater) was sampled and analyzed. The basic properties of the sludge are: moisture content 80%, total organic matter 550g / kgDM, water-soluble total nitrogen 3.0g / kgDM , coliform value ≥ 24,000MPN / 100gDM. Then add wood chips with a moisture content of about 10% to 20% and two conditioners of polypropylene spherical suspended biological carrier fillers with a specification of ZG25, an outer diameter of Φ25mm, and two conditioners as auxiliary materials, and the addition amounts are 15% and 5% of the weight of the sludge respectively. . Put the above materials into the dynamic aerobic fermentation bin closely matched by the ventilation system and the automatic stirring system. Control the weight of the return material to be 40% of the weight of the sludge. Then stir in two directions, so that the fermentation dominant bacteria are evenly mixed into the material syste...

Embodiment 2

[0019] Sampling and analysis of dewatered sludge from a sewage plant in Shanghai (domestic sewage and industrial wastewater accounted for 80% and 20% respectively), the basic properties of the sludge are: moisture content 78%, total organic matter 600g / kgDM, water-soluble total nitrogen 3.5g / kgDM, coliform value ≥ 24,000MPN / 100gDM. Add wood chips with a moisture content of about 10% to 20% and polypropylene spherical fillers such as Example 1 as auxiliary materials, the addition amount is 5% and 10% of the sludge weight respectively, and the above materials are put into a ventilation system and an automatic mixing system. Closely matched dynamic aerobic fermentation chamber. Control the weight of the return material to be 40% of the weight of the sludge. Then stir in two directions, so that the fermentation dominant bacteria are evenly mixed into the material system. Turn on the air pump, control the ventilation rate at 100-300L / min, and stir for 10-20 minutes every 5-10 hou...

Embodiment 3

[0021]Sampling and analysis of dewatered sludge from a sewage plant in Shanghai (domestic sewage and a small amount of food wastewater), the basic properties of the sludge are: moisture content 80%, total organic matter 550g / kgDM, water-soluble total nitrogen 3.0g / kgDM, Coliform bacteria value ≥ 24,000MPN / 100gDM. Then add wood chips with a moisture content of about 10% to 20% and the polypropylene cylindrical filler as in Example 1 as auxiliary materials, and the addition amounts are 10% and 10% of the weight of the sludge respectively. Put the above materials into the dynamic aerobic fermentation bin closely matched by the ventilation system and the automatic stirring system. Control the weight of the return material to be 10% of the weight of the sludge. Then stir in two directions, so that the fermentation dominant bacteria are evenly mixed into the material system. Turn on the air pump, control the ventilation rate at 100-300L / min, and directional stir for 5-10 minutes e...

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Abstract

The present invention relates to new technological process of aerobically composting sludge with suspended biological carrier normally used in sewage treatment as the amendment. The sludge material is added with wood dust in 5-15 wt% of sludge and suspending biological carrier stuffing in 5-10 wt% of sludge as the amendment to make the stirred material possess water content of 60-70 %. The aerobic fermentation apparatus is dynamically controlled I ventilation and stirring frequency for fast composing treatment. Finally, the suspending biological carrier stuffing is sieved out for reuse. The new amendment of the present invention has good attaching performance, no loss and reuse, and the present invention has high composing efficiency.

Description

technical field [0001] The invention relates to a new process for sludge aerobic composting treatment. Specifically, it relates to a method for applying a suspended biological carrier filler as a new conditioner to a sludge aerobic composting process. Background technique [0002] With the acceleration of my country's urbanization process, the sludge generated by urban sewage plants will also increase significantly. According to statistics, the annual amount of dry sludge produced in my country is about 6.67 million tons, and Shanghai alone produces more than 50,000 tons of sludge with a moisture content of 99% every day. At present, the disposal methods of municipal sludge include incineration, sanitary landfill and land utilization, among which land utilization has become an important disposal method. However, stabilization and harmless treatment must be carried out before land use. Stabilization and harmless treatment of sludge mainly include: aerobic digestion, anaero...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05F7/00C05F17/00
CPCY02W30/40Y02A40/20
Inventor 陈玲赵建夫朱志良李宇庆许民邱家洲
Owner TONGJI UNIV
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