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Resin coupled denitrification nitrogen removal method

A denitrification and resin technology, applied in chemical instruments and methods, special treatment targets, water/sludge/sewage treatment, etc., can solve the problem of increasing front-end total nitrogen load and carbon source consumption, without considering the regeneration of sodium chloride Waste liquid treatment does not take into account the decline in exchange efficiency and other issues, so as to improve the stability and treatment effect, avoid the concentration of organic matter in the effluent exceeding the standard, and ensure the denitrification effect

Pending Publication Date: 2020-04-17
NANJING UNIV +1
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Problems solved by technology

The method disclosed in Chinese patent application publication number CN106892543A for deep removal of high-concentration nitrate nitrogen in wastewater integrates denitrification deep bed filter and magnetic ion exchange resin adsorption process to realize deep removal of high-concentration nitrate nitrogen in wastewater, but does not take into account The treatment of 10-26.7wt% sodium chloride regeneration waste liquid is only equivalent to transferring and concentrating the nitrate in the waste water
Chinese patent application number 201710296761.X discloses a method for deep denitrification and dephosphorization of industrial wastewater and biochemical tail water. Selective resin is used to adsorb and remove total nitrogen in wastewater, and the resin regeneration solution sodium chloride solution is transported to sewage treatment The front-end biochemical treatment system of the plant increases the total nitrogen load and carbon source consumption at the front end; a method for the integrated removal of nitrate nitrogen in water disclosed by Chinese Patent Application Publication No. CN105036495 A uses highly selective nitrate Ion exchange resin enriches nitrate nitrogen in water or wastewater. The ion exchange resin enriched with nitrate nitrogen can be directly regenerated and reused through biological denitrification under certain conditions, so as to realize the enrichment of nitrate nitrogen in water or wastewater. Efficient removal, but this method does not take into account the problem that the resin is blocked by microbial mycelia and the exchange efficiency decreases

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  • Resin coupled denitrification nitrogen removal method

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Effect test

Embodiment 1

[0035] The wastewater in this example comes from the wastewater after the aerobic pool (MBR) process of the urban domestic sewage treatment plant. The steps are:

[0036]A. The process of removing nitrate nitrogen by ion exchange resin: firstly, the waste water flows through the domestic 201×7 (717) strongly basic anion exchange resin at a flow rate of 6BV / h, and the average concentration of nitrate nitrogen in the effluent of the resin adsorption tower is 2mg / h L;

[0037] B. The regeneration process of ion exchange resin: output the saturated resin in the ion exchange resin adsorption tower to the resin regenerator, the temperature of the regenerator is controlled at 25°C to 35°C, and the resin is regenerated with 2% sodium acetate solution, single batch The volume of sodium acetate solution required for resin regeneration is twice the volume of the resin. The regenerated resin is returned to the ion exchange resin adsorption tower, and the regeneration solution continues ...

Embodiment 2

[0043] The waste water in this embodiment comes from the waste water after the aerobic pool process of the industrial sewage treatment plant, the concentration of nitrate nitrogen is 70-80mg / L, and the water temperature is 10°C-15°C. The steps of the waste water treatment are:

[0044] A. The process of ion exchange resin to remove nitrate nitrogen: firstly, the waste water flows through the strong basic anion exchange resin of domestic Pu-rolite A520E (produced by Piao Lai Te (China) Co., Ltd., Nanjing, China) at a flow rate of 1BV / h, and the resin adsorption tower The average concentration of nitrate nitrogen in the effluent is 10mg / L;

[0045] B. The regeneration process of ion exchange resin: output the saturated resin in the ion exchange resin adsorption tower to the resin regenerator, the temperature of the regenerator is controlled at 25°C to 35°C, and the resin is regenerated with 8% sodium acetate solution, single batch The volume of sodium acetate solution required f...

Embodiment 3

[0049] The waste water of this embodiment comes from the waste water after the aerobic pool process of the industrial sewage treatment plant, the concentration of nitrate nitrogen is 30-50mg / L, and the water temperature is 10°C-15°C. The steps of the waste water treatment are:

[0050] A. The process of removing nitrate nitrogen by ion exchange resin: firstly, the waste water flows through the strong basic anion exchange resin of domestic Pu-rolite A520E (produced by Piao Laite (China) Co., Ltd., Nanjing, China) at a flow rate of 4BV / h, and the resin adsorption tower The average concentration of nitrate nitrogen in the effluent is 5mg / L;

[0051] B. The regeneration process of ion exchange resin: output the saturated resin in the ion exchange resin adsorption tower to the resin regenerator, the temperature of the regenerator is controlled at 25°C to 35°C, and the resin is regenerated with 5% sodium acetate solution, single batch The volume of sodium acetate solution required f...

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Abstract

The invention discloses a resin coupled denitrification nitrogen removal method, and belongs to the technical field of sewage treatment. According to the invention, a resin is regenerated by using a regeneration liquid containing sodium acetate, nitrogen-containing wastewater is subjected to adsorption treatment by using the regenerated resin, and the nitrogen-containing wastewater subjected to adsorption treatment is introduced into a denitrification reactor and is subjected to denitrification, wherein the regeneration liquid can remove nitrate nitrogen through denitrification, and can also be used as a microbial carbon source, so that the stability and the treatment effect of a sewage biochemical system are improved.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and more specifically relates to a resin-coupled denitrification denitrification method. Background technique [0002] In recent years, with the rapid development of my country's industry and agriculture, industrial wastewater, rural and urban domestic sewage continue to discharge nitrate nitrogen into nature, causing a series of environmental problems caused by excessive nitrate nitrogen content in surface water and groundwater. Moreover, Long-term consumption of high concentrations of nitrate nitrogen can cause methemoglobinemia, and nitrate nitrogen can be converted into carcinogenic nitrite nitrogen in the human body, seriously endangering human health. The treatment of urban domestic sewage and industrial wastewater has received great attention from the state and society. At present, the GB18918-2002 Class A discharge standard requires that the total nitrogen concentration not exceed...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/30
CPCC02F1/42C02F3/2806C02F2303/14C02F2101/30
Inventor 张炜铭牛志华潘丙才汪林吕振华吕路
Owner NANJING UNIV
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