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Device and method for developing carbon source in primary sludge to strengthen denitrification of municipal sewage

A technology for primary sedimentation of sludge and urban sewage, applied in water/sludge/sewage treatment, chemical instruments and methods, water pollutants, etc., can solve problems such as slowing down the fermentation reaction rate, and achieve product inhibition and controllability. The effect of strengthening and strengthening the denitrification effect

Active Publication Date: 2014-07-02
BEIJING DRAINAGE GRP CO LTD
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Problems solved by technology

[0006] For the first time, the present invention uses a sequencing batch reactor to couple the fermentation of primary sludge and the denitrification of urban sewage into the same system, so that the volatile fatty acids produced by sludge fermentation can be used as electron donors in time by denitrifying bacteria Consumption, avoiding the problem of slowing down the fermentation reaction rate due to product accumulation during the fermentation process, and at the same time allowing the fermentation products to be utilized to the greatest extent, strengthening the denitrification effect of urban sewage with low C / N ratio, and at the same time achieving primary sludge initial stabilization of

Method used

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  • Device and method for developing carbon source in primary sludge to strengthen denitrification of municipal sewage
  • Device and method for developing carbon source in primary sludge to strengthen denitrification of municipal sewage

Examples

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Embodiment 1

[0035] Sequencing batch nitration reactor SBR ND 3 To treat domestic sewage with low C / N ratio, each cycle goes through 5 processes of water intake, anoxic stirring, aeration, sedimentation and drainage.

[0036] ⅠWater intake Set the water intake of the water intake pump 2 to 500ml / min, and feed water for 10 minutes. After the system is started, the sewage in the raw water tank 1 enters the sequencing batch nitrification reactor SBR through the inlet pump 2 ND 3. Turn on the first agitator 11 while entering the water.

[0037] Ⅱ Anoxic stirring After the water intake is completed, it enters the anoxic stirring period, and the denitrification time is set to 30 minutes.

[0038] Ⅲ Aeration Turn on the air compressor 10 to supply the air to the sequencing batch nitrification reactor SBR ND Provide oxygen, the aeration rate is constant at 40L / hour, and make the sewage and activated sludge fully contact. According to online monitoring of DO and pH, when ①dpH / dt≥0 and t≥2h or ②...

Embodiment 2

[0048] Sequencing batch nitration reactor SBR ND 3 To treat domestic sewage with low C / N ratio, each cycle goes through 5 processes of water intake, anoxic stirring, aeration, sedimentation and drainage.

[0049] ⅠWater intake Set the water intake of the intake pump 2 to 1L / min, for 5 minutes. After the system is started, the sewage in the raw water tank 1 enters the sequencing batch nitrification reactor SBR through the inlet pump 2 ND 3. Turn on the first agitator 11 while entering the water.

[0050] Ⅱ Anoxic stirring After the water intake is completed, it enters the anoxic stirring period. According to the treated water quality, set the denitrification time to 60 minutes.

[0051] Ⅲ Aeration Turn on the air compressor 10 to supply the air to the sequencing batch nitrification reactor SBR ND Provide oxygen to convert the ammonia nitrogen in the influent into the oxidized nitrogen NO x - ; According to online monitoring of DO and pH, when ①dpH / dt≥0 and t≥2h or ②dDO / dt>...

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Abstract

The invention discloses a device and method for developing a carbon source in primary sludge to strengthen denitrification of municipal sewage, which belong to the technical field of low C / N ratio municipal sewage treatment and biochemical treatment of primary sludge. The device is provided with a raw water tank, a sequencing batch nitration reactor, a sequencing batch sludge fermenting and coupling denitrification reactor and a sludge storage pool. The aeration rate supply and denitrification time are optimized and controlled through DO / ORP / pH sensors installed in an aerobic reaction area and a fermenting and coupling denitrification reaction area. The device provided by the invention is creatively combined with the sequencing batch reactors and applied to a carbon source in sludge development and utilization process, so that the device is suitable for low C / N ratio municipal sewage treatment optimization and control by feeding the primary sludge as the denitrification carbon source. Therefore, the carbon source is saved, the nitrogen removal efficiency is improved, and the device has the advantages of simple device, agile operation, high nitrogen removal efficiency and the like.

Description

technical field [0001] The invention relates to an optimization control technology for an enhanced denitrification process of urban sewage, and belongs to the technical field of urban sewage treatment and primary sludge biochemical treatment. The process is suitable for enhanced denitrification of urban sewage with low C / N ratio. Background technique [0002] In the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" GB18918-2002 promulgated in 2002, my country requires that the effluent quality of all sewage units be less than 5mg / L for ammonia nitrogen and less than 15mg / L for total nitrogen. Nitrogen removal has become a major issue in wastewater treatment and recycling today. In order to meet increasingly stringent discharge standards and reduce operating costs, many sewage plants are faced with the problem of process optimization or upgrading. [0003] In the process of biological denitrification, heterotrophic denitrifying bacteria need to use organic m...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F101/16
Inventor 彭永臻吴程程操沈彬王淑莹张亮
Owner BEIJING DRAINAGE GRP CO LTD
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