Method for denitrifying and removing hydrogen sulfide by sulfide-type DEAMOX post-anoxic filter based on AAO-BAF process effluent

A post-hypoxia and sulfide technology, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve the contradiction between the sludge age of nitrifying bacteria and heterotrophic bacteria, and the high effluent nitrate question

Active Publication Date: 2018-09-18
BEIJING UNIV OF TECH
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Problems solved by technology

The AAO-BAF process is designed to solve two major problems in sewage treatment plants: the contradiction between nitrifying bacteria sludge age and heterotrophic bacteria s

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  • Method for denitrifying and removing hydrogen sulfide by sulfide-type DEAMOX post-anoxic filter based on AAO-BAF process effluent

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Embodiment Construction

[0031] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0032] (1) Sewage enters the anaerobic zone (1.1) of the AAO reactor (1) from the inlet pump (1.6), and at the same time, the return sludge from the secondary settling tank (2) flows back to the anaerobic zone through the sludge return pump (2.1) , in the anaerobic zone, the denitrifying phosphorus-removing bacteria DPAOs absorb the COD in the raw water to synthesize the internal carbon source PHAs, and at the same time release the phosphorus in the body to the outside world, and control the hydraulic retention time HRT in the anaerobic zone to 1-2h;

[0033] (2) Sewage enters the anoxic zone (1.2) from the anaerobic zone (1.1), and at the same time, the effluent from the biological aerated filter BAF (3) is returned from the final pool (3.2) to the anoxic zone by the nitrifying liquid return pump (3.12) In the anoxic zone, the denitrifying phosphorus accumul...

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Abstract

The invention discloses a device and method for denitrifying and removing hydrogen sulfide by a sulfide-type DEAMOX post-anoxic filter based on AAO-BAF process effluent, and belongs to the field of wastewater biological treatment. The method comprises the following steps: average hydraulic retention time in an anoxic zone of an AAO reactor is controlled at 3-8 h, and simultaneous denitrification and dephosphorization are performed by biochemical action of denitrifying phosphorus removal; a filler in a BAF is inoculated with nitrifying bacteria, and the nitrifying bacteria oxidize ammonia nitrogen (NH4<+>-N) into nitrate nitrogen (NO3<->-N); and the post-anoxic filter contains an anoxic filler, at the same time, a hydrogen sulfide gas is collected by tapping from an anoxic section to an anaerobic section of the AAO reactor, the collected gas passes through a hydrogen sulfide absorption tower to absorb the hydrogen sulfide to produce hydrosulphuric acid, then water containing the hydrosulphuric acid, ammonia nitrogen of effluent from the AAO reactor and nitrate nitrogen of effluent from the BAF are introduced into the post-anoxic filter together, and finally a nitrogen element in thewater is removed in the manner of a nitrogen gas to overcome the disadvantage that the AAO+BAF process effluent contains nitrate nitrogen. The method disclosed by the invention can remove the hydrogen sulfide generated in the water treatment process while further removing total nitrogen in municipal sewage, thereby protecting air.

Description

technical field [0001] The invention relates to a method for deep nitrogen and phosphorus removal while removing hydrogen sulfide, belongs to the field of wastewater biological treatment, and is applicable to the technical fields of sewage treatment such as municipal sewage treatment with low C / N ratio, advanced treatment, standard upgrading and transformation. Background technique [0002] With the continuous advancement of the urbanization process and the improvement of people's living standards, the discharge of urban sewage has increased significantly. Since the discharge of nitrogen and phosphorus in sewage will cause eutrophication of water bodies, the problem of nitrogen and phosphorus removal from urban domestic sewage has gradually been raised. Pay attention to. At present, the total nitrogen TN of the effluent of many water plants is difficult to meet the first-level A discharge standard (effluent TN≤15mg / L) of the Discharge Standard of Pollutants for Urban Sewage ...

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Application Information

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IPC IPC(8): C02F9/14C02F101/10C02F101/16
CPCC02F3/1205C02F3/301C02F3/302C02F2001/007C02F2101/101C02F2101/105C02F2101/16
Inventor 彭永臻贾体沛孙事昊陈凯琦张亮王淑莹
Owner BEIJING UNIV OF TECH
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