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Process for facilitating sludge decrement

A sludge reduction and activity promotion technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., to reduce pressure, improve expansion characteristics, and improve operability Effect

Inactive Publication Date: 2008-05-28
YANGZI PETROCHEM +1
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  • Abstract
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Problems solved by technology

[0007] In order to solve the problem of disposal of residual activated sludge in municipal wastewater treatment plants and petrochemical plants, the present invention proposes a new process combining ultrasonic field and sludge treatment process, improving and strengthening the existing sludge dehydration, Anaerobic digestion process, promotes the reduction of excess sludge in petrochemical plants, and meets the needs of petrochemical plants for sewage treatment and environmental protection

Method used

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  • Process for facilitating sludge decrement

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Embodiment Construction

[0020] 1. Use this technology to treat the remaining sludge of the Yangzi Petrochemical Water Plant, at room temperature, ultrasonic frequency 10kHz, sludge retention time 15min, sound intensity 1000W / m 2 . The moisture content of the sludge is reduced from the original >99% to 81%, and the specific resistance of the sludge is reduced from 3.59×10 12 Down to 0.43×10 12 , The amount of flocculant decreased from 0.7% (dry basis) to 0.6% (dry basis), and the sludge anaerobic digestion time was changed from 22 days to 18 days.

[0021] 2. Using 18kHz ultrasonic (>2000W / m 2 ) Treating surplus sludge from a petrochemical plant can destroy the sludge floc structure, break up the sludge cells, release organic matter into the liquid phase and become soluble organic matter, and increase the sludge SCOD concentration by more than 10 times. For the sludge treated by ultrasonic, the SCOD / TCOD ratio during the digestion process (TCOD is the initial total COD value of the original sludge) is alw...

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Abstract

The invention relates to a excess sludge decrement processing technique. The technical project in said invention is to apply acoustic field to sludge disposal process to come up to the aim of accelerating sludge dewatering, anaerobic digesting and sludge decrement finally. The excess sludge in petrochemical factory is concentrated for 24h (the sludge moisture percentage is 96%~98%), radiated by proper ultrasonic field and then divided into two paths: Firstly, add flocculating agent directly, dewater, fill; secondly, add flocculating agent and dewater after the sludge enters anaerobic digestion devices and most of the organic substances in sludge is digested. The invention decreases the volume of sludge and concentration of organic substances in sludge, reduces the pressure of handling excess sludge.

Description

Technical field [0001] The invention relates to a process technology for promoting the dehydration and anaerobic digestion of surplus sludge in a wastewater treatment plant, in particular to a process technology for the ultrasonic field to be used for the dehydration and anaerobic digestion of surplus sludge in a petrochemical plant. Background technique [0002] With the popularization of petrochemical and oil refining wastewater biological treatment processes, the final treatment of surplus sludge has become a very prominent problem. In recent years, as the country pays more and more attention to the environment, pollutant discharge standards have become increasingly strict. The surplus sludge produced by urban domestic sewage can be used as compost; the sludge of petrochemical plants contains toxic and harmful substances and is not allowed to be simply landfilled or used in farmland. At present, the annual discharge of urban sewage in my country is 41.4 billion m3 3 , The seco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F9/08C02F11/14C02F1/36
CPCY02W10/20
Inventor 韩萍芳黄秋明殷绚刘波吕效平甘秋填许红林
Owner YANGZI PETROCHEM
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