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Deep denitrification process for low-concentration total nitrogen wastewater

A deep denitrification, low-concentration technology, applied in water pollutants, biological water/sewage treatment, adsorbed water/sewage treatment, etc., can solve the problem that the total nitrogen in the effluent is not easy to meet the standard, and achieve good re-adsorption performance and increase biomass. , the effect of increasing the abundance ratio

Inactive Publication Date: 2019-07-30
QUANZHOU INST FOR ENVIRONMENTAL PROTECTION IND NANJING UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to provide a deep denitrification process for low-concentration total nitrogen wastewater in view of the fact that the total nitrogen in the effluent of urban sewage treatment plants is difficult to reach the standard, and it is intended to solve the problem of desorption liquid disposal in the process of ion exchange resin removal of total nitrogen

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  • Deep denitrification process for low-concentration total nitrogen wastewater

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Embodiment 1

[0026] refer to figure 1 As shown, this embodiment 1 discloses a deep denitrification process for low-concentration total nitrogen wastewater. This embodiment is aimed at collecting wastewater produced by a certain urban sewage treatment plant. After testing, the raw water quality of the wastewater has a TN content of 20- 30 mg / L, the specific treatment process is as follows:

[0027] 1) Low-concentration total nitrogen wastewater passes through the reactor equipped with ion exchange resin at a flow rate of 6 BV / h. After treatment, the total nitrogen in the wastewater is about 5 mg / L, which can reach the discharge standard;

[0028] a. Resin pretreatment: fill the resin column in the ion exchange resin reactor with resin. The resin is a macroporous styrene series strong base anion exchange resin. In this example, the resin uses D205 type resin as the selective denitrification resin ; Then soak 2 h with 12%NaCl resin desorption solution, enter pure water to rinse the resin co...

Embodiment 2

[0037] refer to figure 1 As shown, this embodiment 2 discloses a deep denitrification process for low-concentration total nitrogen wastewater. This embodiment is aimed at collecting wastewater produced by a certain urban sewage treatment plant. After testing, the raw water quality of the wastewater has a TN content of 18- 22 mg / L, the specific treatment process is as follows:

[0038] 1) Low-concentration total nitrogen wastewater passes through the reactor equipped with ion exchange resin at a flow rate of 6 BV / h. After treatment, the total nitrogen in the wastewater is about 4 mg / L, which can reach the discharge standard;

[0039]a. Resin pretreatment: fill the resin column in the ion exchange resin reactor with resin. The resin is a macroporous styrene series strong base anion exchange resin. In this example, the resin uses D205 type resin as the selective denitrification resin Then soak 2 h with 10%NaCl resin desorption solution, enter pure water to rinse the resin colum...

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Abstract

The invention provides a deep denitrification process for wastewater with a good total nitrogen removal effect for the situation that total nitrogen in effluent of an urban sewage treatment plant doesnot reach the standard easily. The process comprises the following steps that 1), denitrification adsorption treatment is performed on to-be-treated low-concentration total nitrogen wastewater through an ion exchange resin reactor; 2), resin adsorbed with nitrate nitrogen is soaked with a 10%-15% NaCl resin desorption solution for 2 hours to remove the nitrate nitrogen in the resin; 3), a desorption solution uses a denitrification biological filter to remove the nitrate nitrogen; 4), the resin in step 2) can be reused for the adsorption of the nitrate nitrogen in the wastewater after desorption. The process combines an ion exchange technology, a microbial enhancement technology and an anaerobic denitrification technology, uses the ion exchange resin to remove the total nitrogen, and thendilutes the desorption solution into the denitrification biological filter. A salt-tolerant anaerobic denitrifying biofilm is formed on a filler through pre-acclimation in a tank, so that the denitrification function of a biological nitrogen removal reactor is effectively improved, thereby achieving the purpose of removing the total nitrogen in the resin desorption liquid.

Description

technical field [0001] The invention relates to a standard-reaching process for wastewater treatment, in particular to a deep denitrification process for low-concentration total nitrogen wastewater. [0002] technical background [0003] At present, with the development of urbanization and industrialization in China, a large amount of nitrogen-containing domestic sewage and industrial wastewater have been produced, which has led to eutrophication of water bodies and large-scale outbreaks of cyanobacteria blooms, resulting in the destruction of the entire aquatic ecosystem. At present, most of the urban sewage treatment plants are still in compliance with the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002) Class I B or Class II discharge standards. In order to improve the appearance of the city, it is urgent to upgrade and transform urban sewage treatment plants. [0004] The currently used total nitrogen removal technologies mainly include bio...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/16
CPCC02F1/28C02F1/42C02F3/2826C02F3/34C02F2101/16C02F2303/16
Inventor 胡大波席瑞娇邱玉龙超季荣李爱民
Owner QUANZHOU INST FOR ENVIRONMENTAL PROTECTION IND NANJING UNIV
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