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Sludge fermentetion drying process for making fertilizer

A sludge drying and process technology, which is applied in the direction of sewage/sludge fertilizer, sludge treatment, biological sludge treatment, etc., can solve the problem of dry incineration technology investment, high operating cost, ineffective use of sludge nutrients, and production cycle Long and other issues, to achieve the effect of no safety hazards, small footprint, low investment and operating costs

Inactive Publication Date: 2004-03-03
上海复洁环境科技工程有限公司 +1
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  • Summary
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Problems solved by technology

Although foreign sludge treatment technologies can achieve the goals of sludge reduction, recycling, harmlessness, and recycling, there are many problems in applying them to our country.
The investment and operation costs of dry incineration technology are high, and there are safety hazards in the production process, and the product incineration ash can only be used as low-priced building materials, and the nutrients rich in sludge are not effectively used
Although aerobic high-temperature composting technology can produce high-value organic fertilizers, the technology occupies a large area, has a long production cycle, and requires a large amount of fillers, making it difficult to operate in cities

Method used

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Embodiment Construction

[0020] The specific design and operating parameters of this process are related to the size of the sludge particles.

[0021] For example, if the particle size of the finished product required to be produced is about 3mm, the fermentation dryer is designed to have about 10 layers. Among them, the upper 2-3 layers are medium-temperature fermentation layers (temperature is about 40 degrees Celsius), the middle 4-5 layers are high-temperature fermentation layers (temperature is about 60 degrees Celsius), and the lower 2-4 layers are drying layers (temperature is about 100 degrees Celsius). . Because the particle size is small, only about 10 layers are needed to complete the entire fermentation and drying process. The return sludge particles with a particle size between 1mm and 3mm grow into a particle size of about 6mm after being coated and mixed, and are sent to the fermentation dryer. The residence time of the particles in the whole fermentation drier is about 24 hours. Aft...

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Abstract

A process for preparing granular fertilizer from sludge includes such steps as mixing, fermenting and baking. Its advantages are low cost and no environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a kind of medium-temperature and high-temperature aerobic fermentation environment generated in the front and middle sections of the reactor by using hot oil heat transfer to ferment the dewatered sludge of the sewage treatment plant, and at the same time, indirect drying in the rear section of the reactor The process of fermenting sludge to produce granular sludge, which can be used in gardens and agriculture. technical background [0002] With the development of my country's industry and the process of urbanization, the amount of sewage treatment continues to increase, and the sludge production in water treatment plants has become a severe environmental problem. Raw sludge is perishable, has a foul smell, and contains a large amount of toxic and harmful substances. At present, the sludge produced by most sewage treatment plants in my country is dire...

Claims

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Application Information

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IPC IPC(8): C02F11/02C05F7/00
CPCY02A40/20Y02W10/20
Inventor 许太明陈刚卻国良张善发郑燕白海梅朱惟猛
Owner 上海复洁环境科技工程有限公司
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