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Efficient autotrophic nitrogen removal treatment method for urea wastewater

A technology of autotrophic denitrification and treatment method is applied in the field of high-efficiency autotrophic denitrification treatment of urea wastewater, which can solve the problems of increasing the treatment difficulty and treatment cost of urea wastewater, and achieve stable treatment effect, strong economy and high treatment efficiency. Effect

Active Publication Date: 2021-07-13
SOUTH CHINA UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Ammonia nitrogen itself is a typical water nitrogen pollutant. Therefore, it is difficult to completely treat urea wastewater by using ordinary biological hydrolysis methods. It is only to convert urea in wastewater into another pollutant, ammonia nitrogen, and further treatment of the converted ammonia nitrogen is still required. treatment to avoid nitrogen pollution of the water body
In addition, the nitrogen content of urea is about 46.67%, that is, a large amount of ammonia nitrogen will be produced after conventional biological treatment of urea, making urea wastewater transformed into high-concentration ammonia nitrogen wastewater after conventional biological treatment, increasing the difficulty and cost of urea wastewater treatment

Method used

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  • Efficient autotrophic nitrogen removal treatment method for urea wastewater

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Effect test

Embodiment 1

[0034] A high-efficiency autotrophic denitrification treatment method for urea wastewater, comprising the following steps:

[0035] (1) Add 500mL of domesticated and mature anammox sludge (MLSS=2000mg / L) directly into a 1L bioreactor for inoculation, feed 500mL of wastewater with a urea concentration of 400mg / L, turn on aeration and internal circulation, and control The dissolved oxygen concentration was 0.5mg / L, and the reactor was acclimatized and cultivated by stuffy exposure. After 8 hours, the urea removal rate reached 99.2%, the total nitrogen removal rate reached 85.4%, and the reactor acclimatized and cultivated successfully;

[0036] (2) Continuously feed wastewater with a urea concentration of 400mg / L into the reactor successfully cultivated in (1), and control the hydraulic retention time to 5h. At this time, the nitrogen volume load of the influent is about 1.92kgN / m 3 / day, by adjusting the amount of aeration to control the dissolved oxygen concentration in the rea...

Embodiment 2

[0038] A high-efficiency autotrophic denitrification treatment method for urea wastewater, comprising the following steps:

[0039] (1) Add 800mL of domesticated and mature anammox sludge (MLSS=2400mg / L) into a 3L bioreactor for inoculation, feed 500mL of wastewater with a urea concentration of 1500mg / L and 1700mL of tap water, and turn on aeration and internal circulation , control the dissolved oxygen concentration to be 0.5mg / L, carry out stuffy exposure acclimation to the reactor, after 16 hours, the urea removal rate reaches 97.2%, the total nitrogen removal rate reaches 80.4%, and the reactor acclimation is successful;

[0040] (2) Continuously feed wastewater with a urea concentration of 1500mg / L into the reactor successfully cultivated in (1), control the hydraulic retention time to 16h, and control the dissolved oxygen concentration in the reactor to 1.0-1.5mg by adjusting the aeration rate / L, it can be found that the concentration of urea and total nitrogen in the t...

Embodiment 3

[0042] A high-efficiency autotrophic denitrification treatment method for urea wastewater, comprising the following steps:

[0043] (1) Pour 350mL of the mixture of domesticated and mature anammox sludge (MLSS=3500mg / L) into a 2L bioreactor for inoculation, feed 250mL of wastewater with a urea concentration of 4000mg / L and 1400mL of tap water, and turn on the aeration With the internal circulation, the dissolved oxygen concentration is controlled at 0.8 mg / L, and the reactor is acclimated and cultivated with stuffy exposure. After 24 hours, the urea removal rate reaches 96.9%, the total nitrogen removal rate reaches 77.4%, and the reactor is acclimated and cultivated successfully;

[0044] (2) Continuously feed wastewater with a urea concentration of 4000mg / L into the reactor successfully cultivated in (1), control the hydraulic retention time to 24h, and control the dissolved oxygen concentration in the reactor to 2.5-3.0mg by adjusting the aeration rate / L, it can be found t...

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Abstract

The invention belongs to the technical field of urea wastewater treatment, and discloses an efficient autotrophic nitrogen removal treatment method for urea wastewater. The method comprises the following steps: 1) inoculating activated sludge into a reactor, introducing to-be-treated urea wastewater, aerating, performing stuffy aeration domestication culture, and when the urea removal rate reaches 95% or more and the total nitrogen removal rate reaches 75% or more, determining that the domestication culture succeeds; and during closed aeration domestication culture, allowing wastewater in the reactor to be subjected to internal circulation, wherein the activated sludge is anaerobic ammonia oxidation sludge or a mixture of urea hydrolysis sludge, nitrification sludge and anaerobic ammonia oxidation sludge; and 2) continuously introducing the urea wastewater to be treated into the reactor which is successfully cultured in the step 1), controlling the hydraulic retention time, adjusting the aeration rate, reacting and discharging water to realize efficient autotrophic nitrogen removal of the urea wastewater. According to the method, autotrophic nitrogen removal treatment of the medium-high concentration urea wastewater is achieved, urea in the wastewater is thoroughly converted into nitrogen to be removed, and the urea removal rate is high.

Description

technical field [0001] The invention belongs to the technical field of environmental protection urea wastewater treatment, and relates to a biological denitrification treatment method of urea wastewater, in particular to an efficient autotrophic denitrification treatment method of urea wastewater. Background technique [0002] A large amount of high-concentration urea wastewater will be discharged in the fields of urea production process, printing, dyeing and printing process. Because urea itself is easily ammoniated into ammonia nitrogen, a large amount of urea wastewater will aggravate the nitrogen pollution of water bodies and damage the water quality. Currently, commonly used urea wastewater treatment methods include thermal hydrolysis, chemical oxidation, urease hydrolysis, and biological treatment. Thermal hydrolysis and chemical oxidation consume a lot of energy and have high operating costs. They are suitable for high-concentration urea wastewater and are used to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F3/12C02F3/30C02F101/16
CPCC02F3/28C02F3/12C02F3/302C02F2101/16Y02W10/10
Inventor 汪晓军陈振国陈永兴胡浩林邓翠兰
Owner SOUTH CHINA UNIV OF TECH
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