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Process for treating excess sludge

A technology for excess sludge and sludge, applied in the field of water treatment, can solve the problems of residence time as long as 20-30d, low digestion rate, low treatment efficiency, etc., to achieve reduction, increase production, and improve removal rate. Effect

Active Publication Date: 2005-01-26
TSINGHUA UNIV
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Problems solved by technology

However, the traditional anaerobic digestion method has disadvantages such as low digestion rate, low treatment efficiency (COD removal rate of 35% to 40%), and long residence time of 20 to 30 days (days).

Method used

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  • Process for treating excess sludge

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Embodiment Construction

[0009] The invention provides a method for treating excess sludge that can realize resource utilization and volume reduction treatment. The method is through three processing steps of thermal hydrolysis treatment, anaerobic digestion and dehydration in a sequencing batch anaerobic reactor (ASBR):

[0010] 1) Using an autoclave as a reactor, thermal hydrolysis is carried out at a temperature range of 110° C. to 190° C., and the thermal hydrolysis time is 15 to 75 minutes. With the different properties of sludge, the optimal thermal hydrolysis conditions are also different. After the sludge is pretreated by thermal hydrolysis, the microbial flocs disintegrate, the microbial cells rupture, and the organic matter (such as protein, fat and carbohydrates) of the cells is released and further hydrolyzed, so the anaerobic digestion performance of the sludge is also improved. Thereby improving the efficiency of subsequent anaerobic digestion and increasing the gas production of methan...

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Abstract

Disclosed is a method and equipment for treatment of polluted fluid, wherein ferrum family flocculating agents of a finite concentration are charged into the membrane bioreactor, in which they are subject to domestication and become compact biological ferrum sludge with improved property.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a method for treating excess sludge suitable for recycling and reducing the excess sludge in municipal sewage treatment plants. Background technique [0002] With the acceleration of my country's urbanization process, urban sewage treatment capacity and sludge production have increased dramatically. Sludge contains a variety of harmful substances, such as: refractory organic matter, carcinogenic, teratogenic, mutagenic dangerous compounds, heavy metal ions, pathogenic microorganisms, etc. The high pollution characteristics of sludge lead to high environmental risks. At the same time, its refractory and high water content make the actual sludge treatment difficult, expensive and complicated to manage. The treatment and disposal of sludge has become an increasingly urgent and serious problem in environmental protection. At present, the treatment of excess sludge mainly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F11/10C02F11/12
CPCY02E50/343Y02E50/30
Inventor 王伟王治军
Owner TSINGHUA UNIV
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