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A method for deep denitrification and dephosphorization of sewage

A technology for sewage and sewage treatment devices, which is applied in chemical instruments and methods, multi-stage water/sewage treatment, biological water/sewage treatment, etc. problems such as operating costs and sludge treatment and disposal costs increase, to achieve the effect of reducing residence time, reducing operating costs, and saving floor space

Active Publication Date: 2020-01-21
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve the stable compliance of the total nitrogen and total phosphorus of the first-level A standard, most sewage treatment plants need to add high-quality carbon sources and phosphorus removal chemicals, which greatly increases the operating cost
In addition, the addition of carbon sources is likely to cause a large number of heterotrophic bacteria to proliferate, and the increased amount of excess sludge will lead to higher sludge treatment and disposal costs; at the same time, due to the high price of phosphorus removal chemicals, it will significantly reduce the depth of filter cloth or turntable. The service life of the treatment equipment will undoubtedly indirectly increase the operating cost of the sewage treatment plant

Method used

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  • A method for deep denitrification and dephosphorization of sewage
  • A method for deep denitrification and dephosphorization of sewage
  • A method for deep denitrification and dephosphorization of sewage

Examples

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Embodiment 1

[0025] The design of embodiment 1 denitrification and dephosphorization device

[0026] Such as figure 1 As shown, an acrylic plate is used to prepare a nitrogen and phosphorus removal device. The nitrogen and phosphorus removal device includes a biosorption tank 3, a sedimentation tank 5, an MBR tank 7 and a sulfur-iron autotrophic denitrification tank 9, and the effective volumes are 1.5L, 12L, 21L and 4.8L; the biosorption tank 3 is connected to the water inlet through the water inlet pump 1, and the lower part is connected to the first fan; The MBR pool 7 is connected; the MBR pool 7 adopts a 0.02 μm flat film, and the ventilation pipeline is arranged in the MBR pool 7, and the pipeline is connected with the second fan 6; an MBR outlet pump is set between the MBR pool 7 and the sulfur iron autotrophic denitrification pool 9 8, thus the pump sucks out water from the MBR pool 7, and pumps it into the sulfur-iron autotrophic denitrification tank; the sulfur-iron autotrophic ...

Embodiment 2

[0028] Embodiment 2 biosorption section operation

[0029] Such as Figure 2-5 As shown, most of the total nitrogen content of the test device influent is dissolved ammonia nitrogen, accounting for an average of 85%. The concentration of total phosphorus ranges from 0.89 to 5.4 mg / L, with an average value of 2.8 mg / L. Influent COD is 150-456mg / L, with an average value of 288.6mg / L. The biosorption section is to cultivate prokaryotic microorganisms that are adapted to the raw water environment and can achieve rapid proliferation by controlling the shorter HRT and SRT to adsorb the particulate matter in the influent, so the biosorption section has a good ability to remove COD in the influent . The range of effluent COD in the biological adsorption section is 76-102mg / L, the average value is 90.2mg / L, and the average removal rate is 66.6%. The removal rates of ammonia nitrogen and total nitrogen were both low, with an average of 17%, because the HRT was short and ammonia nitr...

Embodiment 3

[0031] Example 3 Phosphorus and nitrogen removal device for sewage treatment

[0032] Run the device of Example 1, control the hydraulic retention time (HRT) of the biosorption section to be 0.35-0.7h, the sludge age (SRT) to be 1.5-3d, the dissolved oxygen (DO) range to be 0.5-1mg / L, and the mixed liquor to be suspended The solid concentration (MLSS) is 4000-5000mg / L ( Figure 6 ). The HRT of the sedimentation tank is 2-3h. MBR adopts 0.02μm flat membrane, membrane flux is 8-12L / m 2 .h, HRT is 6-8h, SRT is 18-22d, DO range is 5-7mg / L, MLSS is maintained at 6500-8000mg / L; the inner diameter of sulfur iron autotrophic denitrification filter is 10cm, and the effective height is 60cm. The control HRT range is 2-3h.

[0033] Under the condition that the above operation method remains unchanged, different iron filling ratios are used for sewage treatment, as shown in Table 1, the higher the iron filling ratio, the lower the total phosphorus concentration in the effluent; but wh...

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Abstract

The invention discloses a sewage deep dentrification and dephosphorization method, and belongs to the technical field of sewage treatment. The method applies biological adsorption / MBR / iron sulfur autotrophic denitrification combined process to treat raw water of a sewage treatment plant. On the basis of the reduction of sustaining time of the hydraulic force of the whole combined process, no adding of carbon source is necessary, thus operation cost is reduced. The use of anaerobic fermentation resourceful treatment manner which can generate acid or methane, can generate products with high added value, and truly achieve the resourceful utilization of pollutants. The method has the advantages of being high in dentrification and dephosphorization efficiency, capable of achieving the outlet water quality that the total nitrogen is lower than 6mg / L and the total phosphor is less than 0.5mg / L, and reducing land occupation of a sewage treatment plant. Moreover the combined process needs no additional carbon source, thus greatly reducing the operation cost of the sewage plant.

Description

technical field [0001] The invention relates to a method for deeply denitrifying and dephosphorizing sewage, belonging to the technical field of sewage treatment. Background technique [0002] Nitrogen and phosphorus are the main elements that cause eutrophication in natural water bodies, so the removal of nitrogen and phosphorus in sewage has become the two main tasks of sewage treatment plants. At present, domestic sewage treatment plants have generally implemented the first-level A standard in the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), in which the concentration of TN shall not exceed 15mg / L, and the concentration of TP shall not exceed 0.5mg / L. In recent years, many regions in my country have begun to implement more stringent local sewage treatment standards. For example, the A standard in the "Beijing Local Water Pollution Discharge Standard" (DB11 / 307-2013) reduces the limits of effluent total nitrogen and total phosphorus to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/16C02F101/10
CPCC02F3/00C02F3/2806C02F3/34C02F9/00C02F2101/105C02F2101/16
Inventor 郑凯凯王硕李激支尧
Owner JIANGNAN UNIV
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