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Method for deep denitrification of integrated biological aerated filter

A biological aerated filter and deep denitrification technology, which is applied in the field of integrated biological aerated filter deep denitrification device, can solve the problems of unstable treatment effect, difficulty in effluent SS, complicated backwashing operation, etc., and achieve Long backwash cycle, reduced hydraulic retention time, and enhanced filtration effect

Active Publication Date: 2013-03-13
北控水务(中国)投资有限公司
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Problems solved by technology

[0004] At present, secondary or tertiary biological aerated filter processes are mostly used in the treatment of sewage and wastewater, and there are also nitrification and denitrification integrated filters, which generally have long treatment processes, high infrastructure costs, complex backwashing operations and high energy consumption, and treatment The effect is unstable, and the water SS is difficult to meet the standard and other problems

Method used

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  • Method for deep denitrification of integrated biological aerated filter

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Embodiment

[0044] Taking the effluent from the secondary sedimentation tank of an AAO-BAF system as the treatment object, the specific gravity of the filler in the deep denitrification device of the integrated biological aerated filter is 1.005g / cm 3 , The porosity is 79%, the empty bed residence time is less than 1.2h, and the water NH 4 + -N ranges from 9 to 19 mg / L, and the test temperature is 20 to 25°C. Under the test conditions, the ammonia nitrogen removal load is greater than 0.8 kgNH 4 + -N / (m 3 .d), system for NH 4 + - The average removal rates of N and TN reach 95% and 80% respectively; the backwash cycle of the integrated biological aerated filter reaches 20d.

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Abstract

Belonging to the technical field of biological sewage treatment, the invention relates to a method for deep denitrification of an integrated biological aerated filter, and the method is suitable for deep denitrification of sewage and wastewater. A device for deep denitrification of the integrated biological aerated filter mainly comprises: a water inlet system, the integrated biological aerated filter, a carbon source adding system and a back washing system. The integrated biological aerated filter adopts an upward flow operation mode, and is divided into a nitrification area and a denitrification area through a gas-water separator. The method includes: subjecting nitrogen-containing sewage and wastewater to ammonia nitrogen oxidation by the nitrification area at the lower part of the biological aerated filter; passing the gas through an intermediate water layer, then conducting separation and discharge; and making use of the electronic donor provided by an external carbon source in the denitrification area to complete deep removal of nitrogen. The device has a small floor area and a simple process, and is easy to form integrated equipment.

Description

technical field [0001] The invention belongs to the technical field of biological treatment of sewage and wastewater, and is particularly suitable for upgrading and rebuilding nitrogen-containing sewage and wastewater treatment plants or newly constructing treatment units, and in particular relates to a deep denitrification device and method for an integrated biological aerated filter. Background technique [0002] Biological Aerated Filter (BAF) is a sewage treatment technology that integrates biofilm biochemical degradation and filter layer filtration functions, which is very suitable for my country's national conditions, and can realize the regeneration of water resources. Compared with other activated sludge treatment systems, BAF has larger biomass, strong impact load resistance, high volume load, small footprint, small sludge output, and stable treatment effect. It can be used for secondary treatment of sewage and wastewater, and can also be used in depth processing. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
Inventor 汪传新彭永臻张为堂王淑莹
Owner 北控水务(中国)投资有限公司
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