Deep nitrogen and phosphorus removal method for industrial wastewater and biochemical tail water

A technology for industrial wastewater and deep denitrification, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc. Foreground effect

Inactive Publication Date: 2017-07-25
NANJING INNOVATION CENT FOR ENVIRONMENTAL PROTECTION IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the problem that the prior art cannot carry out deep denitrification and phosphorus removal of industrial wastewater and biochemical tail water with high efficiency and low consumption, and provides a method for deep denitrification and phosphorus r

Method used

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Examples

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Effect test

Embodiment 1

[0026] The method for deep denitrification and dephosphorization of industrial wastewater and biochemical tail water in this embodiment is carried out according to the following steps:

[0027] (1) Pump the biochemical tail water of printing and dyeing wastewater with a total nitrogen concentration of 15 mg / L and a total phosphorus concentration of 0.5 mg / L into the microflocculation filter, and add polyaluminium chloride to deeply remove the total phosphorus in the biochemical tail water;

[0028] (2) Pump the effluent of step (1) into a fully mixed flow reactor filled with polyacrylic acid-based amino resin, regenerate once, the effluent total nitrogen concentration is 10 mg / L, and the total phosphorus concentration is 0.3 mg / L;

[0029] (3) The saturated resin in step (2) is taken out in a ratio of 1 / 3, and the resin is regenerated with a 20wt% sodium chloride aqueous solution with a resin / regenerant volume ratio of 1:1, and the desorption solution is diluted for 10 times (...

Embodiment 2

[0031] The method for deep denitrification and dephosphorization of industrial wastewater and biochemical tail water in this embodiment is carried out according to the following steps:

[0032] (1) Pump the biochemical tail water of chemical wastewater with a total nitrogen concentration of 20 mg / L and a total phosphorus concentration of 0.8 mg / L into the microflocculation filter, and add polyaluminum sulfate to deeply remove the total phosphorus in the biochemical tail water;

[0033] (2) Pump the effluent of step (1) into the fully mixed flow reactor filled with polyacrylic acid series amino resin, regenerate twice, the effluent total nitrogen concentration is 13mg / L, and the total phosphorus concentration is 0.4mg / L;

[0034] (3) The saturated resin in step (2) is taken out in a ratio of 1 / 4, and the resin is regenerated with 18wt% sodium chloride aqueous solution with a resin / regenerant volume ratio of 1:1, and the desorption solution is diluted for 8 Return to the front-e...

Embodiment 3

[0036] The method for deep denitrification and dephosphorization of industrial wastewater and biochemical tail water in this embodiment is carried out according to the following steps:

[0037] (1) Pump the biochemical tail water of textile wastewater with a total nitrogen concentration of 22 mg / L and a total phosphorus concentration of 0.9 mg / L into the micro-flocculation filter, and add polyferric chloride to deeply remove the total phosphorus in the biochemical tail water;

[0038] (2) Pump the effluent of step (1) into a fully mixed-flow reactor filled with polystyrene-based amine-based resin, regenerate 3 times, the effluent total nitrogen concentration is 14mg / L, and the total phosphorus concentration is 0.45mg / L;

[0039] (3) The saturated resin in step (2) is taken out in a ratio of 1 / 5, and the resin is regenerated with a 15wt% sodium chloride aqueous solution with a resin / regenerant volume ratio of 1:1, and the desorption solution is diluted for 6 Return to the front...

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PUM

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Abstract

The invention relates to a deep nitrogen and phosphorus removal method for industrial wastewater and biochemical tail water, relating to a wastewater multi-level treatment method containing at least one chemical treatment step. According to the deep nitrogen and phosphorus removal method, the nitrogen and phosphorus removal effects are good. The deep nitrogen and phosphorus removal method comprises the following steps: (1) adding a flocculating agent into to-be-treated industrial wastewater and biochemical tail water, so as to remove total phosphorus from the wastewater; (2) pumping effluent of the step (1) into a complete mixing flow reactor filled with high selectivity denitrification resin, and adjusting the regeneration frequency so as to stabilize concentrations of total nitrogen and total phosphorus within a certain range; and (3) taking out adsorbed and saturated resin in the step (2) in a certain proportion, regenerating the resin by virtue of a regenerant in a volume ratio of 1 to 1, diluting a desorption liquid to a certain times, and returning the desorption liquid to a front-end biochemical treatment system. By treating through the method, the dosing quantity of medicaments such as the flocculant and a carbon source can be greatly reduced, and furthermore, external influence on effluent quality is extremely small. The deep nitrogen and phosphorus removal method belongs to the field of deep treatment of industrial wastewater.

Description

technical field [0001] The invention relates to a wastewater multistage treatment method comprising at least one chemical treatment step, in particular to a method for deep denitrification and dephosphorization of industrial wastewater and biochemical tail water. Background technique [0002] Nitrogen and phosphorus in wastewater are important causes of lake eutrophication and large-scale outbreaks of cyanobacterial blooms. The "Water Pollution Prevention and Control Action Plan" issued by the State Council in 2015 pointed out that "select pollutants such as total nitrogen, total phosphorus, and heavy metals that have a significant impact on water environment quality, and study them into the binding index system for total discharge control of river basins and regions. ", "Rivers flowing into eutrophic lakes and reservoirs should implement total nitrogen emission control." Therefore, the advanced treatment of total nitrogen and total phosphorus in wastewater is urgent. [0...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F1/285C02F1/5236
Inventor 姜笔存陈达于伟华宋均轲胡海兰曲艳南谈政焱王强
Owner NANJING INNOVATION CENT FOR ENVIRONMENTAL PROTECTION IND
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