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A method for denitrification of low-concentration ammonia nitrogen wastewater based on adsorption-regeneration and anaerobic ammonium oxidation

An anaerobic ammonia oxidation and low-concentration ammonia nitrogen technology is applied in the field of denitrification treatment of low-concentration ammonia nitrogen wastewater, which can solve the problems of large amount of alkali dosage, biofilm influence, damage, etc., so as to improve treatment efficiency, reduce treatment costs, and achieve economical The effect of reliable technical means

Active Publication Date: 2021-08-10
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, because the biological and chemical desorption processes are completed in the same reactor, the above methods have obvious shortcomings
First, because part of the adsorbed ammonia nitrogen has been desorbed through biological regeneration, the amount of alkali used for chemical desorption is large, the utilization rate is low, and the total amount of ammonia nitrogen desorption is low; The total amount determines the nitrite concentration required for biochemical desorption, which cannot maximize the efficiency of biochemical desorption; third, the chemical desorption process will inevitably affect and damage the biofilm, which is not conducive to the continuous operation of the reactor

Method used

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  • A method for denitrification of low-concentration ammonia nitrogen wastewater based on adsorption-regeneration and anaerobic ammonium oxidation

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Embodiment 1

[0050] A low-carbon denitrification method for low-concentration ammonia-nitrogen wastewater based on adsorption-desorption, comprising the following steps:

[0051] (1) Take a fixed-bed reaction column filled with natural zeolite and have an effective volume of 1.0L and 3.0L respectively, wherein the 1.0L column is used as an adsorption materialization desorption column, and the 3.0L column is an adsorption biochemical regeneration column. Add 300mL of nitrification sludge with a sludge concentration of 3000mg / L, add ammonia nitrogen (such as: ammonium chloride) at a temperature of 24°C, and a dissolved oxygen of 0.1-1.0mg / L. The concentration of ammonia nitrogen is 50mg. / L, add sodium bicarbonate, the concentration of sodium bicarbonate is about 600mg / L, and after 8 hours of stuffy exposure, the film is successfully formed on the fixed bed;

[0052] (2) Pass waste water with an ammonia nitrogen concentration of 15mg / L into the adsorbate desorption column and the adsorption ...

Embodiment 2

[0060] A low-carbon denitrification method for low-concentration ammonia-nitrogen wastewater based on adsorption-desorption, comprising the following steps:

[0061] (1) Take a fixed-bed reaction column filled with natural zeolite and have an effective volume of 0.5L and 5.0L respectively, wherein the 0.5L column is used as an adsorption materialization desorption column, and the 5.0L column is an adsorption biochemical regeneration column. Add 500mL of nitrification sludge with a sludge concentration of 5000mg / L, add ammonia nitrogen (such as: ammonium chloride) at a temperature of 28°C, and a dissolved oxygen of 0.5-2.0mg / L. The concentration of ammonia nitrogen is 50mg / L, add sodium bicarbonate, the concentration of sodium bicarbonate is about 800mg / L, after 12 hours of stuffy exposure, the fixed bed is successfully formed;

[0062] (2) The wastewater with an ammonia nitrogen concentration of 50mg / L is passed into the adsorption desorption column and the adsorption biochem...

Embodiment 3

[0070] A low-carbon denitrification method for low-concentration ammonia-nitrogen wastewater based on adsorption-desorption, comprising the following steps:

[0071] (1) Take a fixed-bed reaction column filled with artificial zeolite and have an effective volume of 1.0L and 3.0L respectively, wherein the 1.0L column is used as an adsorption materialization desorption column, and the 3.0L column is an adsorption biochemical regeneration column. Add 100mL of nitrification sludge with a sludge concentration of 8000mg / L, add ammonia nitrogen (such as: ammonium chloride) at a temperature of 30°C, and a dissolved oxygen of 1.0-4.0mg / L. The concentration of ammonia nitrogen is 100mg. / L, add sodium bicarbonate, the concentration of sodium bicarbonate is about 1000mg / L, after 24 hours of stuffy exposure, the fixed bed is successfully formed;

[0072] (2) Pass waste water with an ammonia nitrogen concentration of 80mg / L into the adsorption desorption column and the adsorption biochemic...

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Abstract

The invention belongs to the technical field of ammonia nitrogen wastewater treatment, and discloses a low-concentration ammonia nitrogen wastewater denitrification method based on adsorption-regeneration and anaerobic ammonium oxidation. Methods: (1) The adsorption biochemical regeneration column equipped with ammonia nitrogen adsorption filler is used for biofilming; (2) The low-concentration ammonia nitrogen wastewater is passed into the adsorption physicochemical desorption column and adsorption biochemical regeneration column equipped with ammonia nitrogen adsorption filler respectively, When the concentration of ammonia nitrogen in the effluent water is close to the discharge limit, stop the water inflow; add alkali and salt to the desorption column, and internally circulate for physical and chemical desorption to obtain ammonia nitrogen regeneration solution; add alkalinity to the regeneration column, internal circulation and aeration Perform biochemical desorption to obtain nitrite regeneration liquid; mix the two regeneration liquids, and then perform anaerobic ammonium oxidation treatment; (3) feed low-concentration ammonia nitrogen waste water into the desorption column and regeneration column respectively for adsorption, and cycle step (2). The method of the invention improves the treatment efficiency of low-concentration ammonia-nitrogen wastewater, and realizes low-carbon energy-saving treatment and high-standard discharge of low-concentration ammonia-nitrogen wastewater.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering sewage biological treatment, and specifically relates to a denitrification method for low-concentration ammonia-nitrogen wastewater based on adsorption-regeneration and anaerobic ammonium oxidation, which is suitable for denitrification treatment of low-concentration ammonia-nitrogen wastewater. Background technique [0002] How to treat low-concentration ammonia-nitrogen wastewater in a low-carbon and energy-saving manner and meet high discharge standards has always been a problem and challenge in the field of water treatment. Compared with traditional biological denitrification technology, anaerobic ammonium oxidation technology can save 60% of aeration energy consumption and avoid the use of denitrification carbon source. It is currently recognized as a low-carbon energy-saving biological denitrification technology. This technology is based on the stable nitrification of ammon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/16
CPCC02F1/281C02F3/307C02F2101/16C02F2203/006C02F2303/16
Inventor 汪晓军陈振国冯兴会
Owner SOUTH CHINA UNIV OF TECH
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