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Method for achieving stable nitrosation of low-concentration ammonia-nitrogen wastewater

A low-concentration ammonia nitrogen and wastewater technology, applied in chemical instruments and methods, water pollutants, biological water/sewage treatment, etc., can solve the problems of increasing wastewater denitrification treatment costs, blocking feasibility, etc., and achieve stable nitrosation , reduce processing costs, economical and reliable processing effect

Inactive Publication Date: 2019-01-18
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accumulation of nitrate will block the feasibility of anammox or nitrosation and denitrification process, and increase the treatment cost of wastewater denitrification

Method used

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  • Method for achieving stable nitrosation of low-concentration ammonia-nitrogen wastewater
  • Method for achieving stable nitrosation of low-concentration ammonia-nitrogen wastewater
  • Method for achieving stable nitrosation of low-concentration ammonia-nitrogen wastewater

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Experimental program
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Effect test

Embodiment 1

[0049] A method for stably realizing the nitrification of low-concentration ammonia nitrogen wastewater, comprising the following steps:

[0050] (1) Take two fixed-bed reactors (solid reactor No. 1 and reactor No. 2) that are filled with natural zeolite and have an effective volume of 3.0L respectively, and use them to adsorb waste water with an ammonia nitrogen concentration of 20mg / L, and wait for adsorption for 64h When the final adsorption water concentration is 4.87mg / L, the adsorption is stopped; the two reactors are biofilm-coated, and 300mL of nitrification sludge with a sludge concentration of 2500mg / L are respectively added, and the temperature is 25°C and the dissolved oxygen is 0.2 -1.0mg / L, add sodium bicarbonate 3.4g / L (Note: the alkalinity of 3.4g / L sodium bicarbonate is about 2000mg / L, so 250mg / L of ammonia nitrogen can be desorbed during the film formation period), stuffy exposure After 8 hours, the fixed bed reactor successfully formed the film;

[0051] (2...

Embodiment 2

[0057] A method for stably realizing the nitrification of low-concentration ammonia nitrogen wastewater, comprising the following steps:

[0058] (1) Take two fixed-bed reactors (Reactor No. 1 and Reactor No. 2) that have been filled with artificial zeolite and have an effective volume of 1.5L respectively, and use it to adsorb waste water with an ammonia nitrogen concentration of 40 mg / L. After 40 hours of adsorption When the concentration of the adsorption water is 4.95mg / L, the adsorption is stopped; the two reactors are bio-filmed, and 200mL of nitrification sludge with a sludge concentration of 3500mg / L is added respectively, and the temperature is 28°C, and the dissolved oxygen is 1.5-2.0 mg / L, adding sodium bicarbonate 6g / L, after 16 hours of aeration and stuffy aeration, the film formation in the fixed bed reactor was successful;

[0059] (2) Empty the two reactors, and pass the wastewater with an ammonia nitrogen concentration of 40mg / L into the two reactors for adsor...

Embodiment 3

[0065] A method for stably realizing the nitrification of low-concentration ammonia nitrogen wastewater, comprising the following steps:

[0066] (1) Take two fixed-bed reactors (Reactor No. 1 and Reactor No. 2) that are filled with natural zeolite and have an effective volume of 4.0L respectively, and use it to adsorb the waste water whose ammonia nitrogen concentration is 150mg / L. After 12 hours of adsorption When the concentration of the adsorption water is 4.91mg / L, the adsorption is stopped; the two reactors are biofilm-coated, and 200mL of nitrification sludge with a sludge concentration of 8000mg / L is added respectively, at a temperature of 35°C and a dissolved oxygen of 5.0-6.0 mg / L, adding sodium bicarbonate 3.6g / L, after 24 hours of aeration and suffocation, the fixed bed reactor successfully formed film;

[0067] (2) Empty the reactor, pass the wastewater with an ammonia nitrogen concentration of 150mg / L into two reactors for adsorption treatment, the influent flow ...

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Abstract

The invention belongs to the technical field of treatment of low-concentration ammonia-nitrogen wastewater and discloses a method for achieving stable nitrosation of low-concentration ammonia-nitrogenwastewater. The method comprises the following steps: (1) introducing low-concentration ammonia-nitrogen wastewater into a fixed-bed reactor filled with an ammonia-nitrogen adsorbent for adsorbing, then inoculating the wastewater with nitration sludge for carrying out biofilm formation culturing after finishing adsorbing; (2) discharging wastewater, introducing the low-concentration ammonia-nitrogen wastewater for adsorbing, stopping supplying water when the ammonia-nitrogen concentration in the discharged water is close to a discharge limit value and finishing adsorbing; (3) adding alkali into the fixed-bed reactor after finishing adsorbing, aerating, increasing the temperature, carrying out biochemical desorption under an internal circulation condition and discharging regenerated liquid; (4) introducing the low-concentration ammonia-nitrogen wastewater into the fixed-bed reactor again for adsorbing; (5) finishing adsorbing and carrying out biochemical desorption according to step (3); and (6) circulating steps (4) and (5). The method is capable of achieving stable nitrosation of the low-concentration ammonia-nitrogen wastewater; meanwhile, the regenerated liquid contains high-concentration nitrite nitrogen, so that the subsequent denitrification treatment cost can be reduced.

Description

technical field [0001] The invention belongs to the field of environmental engineering wastewater treatment, and in particular relates to a method for stably realizing the nitrosation of low-concentration ammonia nitrogen wastewater. Background technique [0002] In order to treat ammonia-nitrogen wastewater more low-carbon and energy-saving, people have successively developed wastewater biological denitrification technologies such as anaerobic ammonium oxidation process and nitrosation denitrification process. The anaerobic ammonium oxidation process is undoubtedly the best biological nitrogen removal process because of its low energy consumption and no need for additional carbon sources. Another low-carbon and energy-saving biological denitrification process is the nitrification and denitrification process. Whether it is anaerobic ammonium oxidation process or nitrosation and denitrification process, the stable nitrosation of ammonia nitrogen wastewater must be realized. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/34C02F1/28C02F101/16
CPCC02F1/28C02F3/34C02F9/00C02F2101/16C02F2101/163C02F2303/16
Inventor 汪晓军陈振国陈浩川
Owner SOUTH CHINA UNIV OF TECH
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