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A method for further denitrification of high ammonia nitrogen wastewater based on the a/o process

A high-ammonia nitrogen and process technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of denitrification rate limitation, secondary pollution of effluent, and low denitrification rate. , to achieve the effect of easy industrialization, wide application range and high denitrification rate

Active Publication Date: 2016-06-29
SHANDONG LUKANG ZHONGHE ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the restriction of the denitrification rate of the existing A / O process or its improved process by the reflux ratio, the high total nitrogen content of the effluent, the low denitrification rate, the complex system and the secondary pollution of the effluent and other defects, and provides a method for further denitrification of high ammonia nitrogen wastewater based on the A / O process

Method used

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  • A method for further denitrification of high ammonia nitrogen wastewater based on the a/o process
  • A method for further denitrification of high ammonia nitrogen wastewater based on the a/o process
  • A method for further denitrification of high ammonia nitrogen wastewater based on the a/o process

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Embodiment 1

[0027] The invention is used to transform and upgrade the denitrification project of treating high-ammonia-nitrogen wastewater by the A / O process. Wastewater treatment capacity 1000m 3 d -1 , waste water COD2500mg·L -1 , TN450mg·L -1 , NH 3 -N350mg·L -1 . The original treatment process is A / O process, and the effective volume of A pool is 1600m 3 , the effective volume of O pool is 3400m 3 , divided into two corridors, the effective volume of the secondary settling tank is 500m 3 . The reflux ratio of the nitrifying liquid at the end of the O tank is 4.0, and the reflux ratio of the sludge in the secondary settling tank is 1.0. Original system effluent TN72.9mg·L -1 , NH 3 -N0.2mg·L -1 , TN removal rate is about 83.8%, effluent COD value is 50.0mg·L -1 .

[0028] After testing, it was found that in the above-mentioned A / O process, the ammonia nitrogen dropped to 1.0mg·L at about 75% of the O pool along the water flow direction -1 Below, dissolved oxygen jumps to...

Embodiment 2

[0031] The invention is used to transform and upgrade the high ammonia nitrogen and low C / N wastewater treatment project of a certain nitrogen fertilizer plant.

[0032] The COD of wastewater from a nitrogen fertilizer plant is 600mg·L -1 , TN is 200mg·L -1 , NH 3 -N is 150mg·L -1 , the treated water volume is 10000m 3 d -1 , the existing treatment process is A / O process, and the effective volume of A pool is 5000m 3 , the effective volume of O pool is 10000m 3 , divided into four corridors, the effective volume of the secondary settling tank is 1500m 3 . The reflux ratio of the nitrifying liquid at the end of the O tank is 4.0, and the reflux ratio of the sludge in the secondary settling tank is 0.5. After treatment, the COD of the effluent is 30.0~50.0mg·L -1 , NH 3 -N-1 , but TN still has 36.5mg·L -1 Left and right, it cannot meet the requirements of TN deep processing (ie GB18918-2002, first-class standard).

[0033] The test found that in the above-mentioned A...

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Abstract

The invention discloses a method for further denitrifying high ammonia-nitrogen wastewater based on an A / O (Anoxic / Oxic) process. The method comprises the following steps that: the high ammonia-nitrogen wastewater is treated through an improved A / O process, wherein the improved A / O process is that mud and water mixed solution at a dissolved oxygen jumping position of an aeration tank is used as nitrification solution and back flows into an anoxic tank on the basis of the traditional A / O process; at the same time, a carbon source is added at the dissolved oxygen jumping position of the aeration tank; and the dissolved oxygen jumping position is the position that the dissolved oxygen in the aeration tank is jumped from less than 0.5mg / L to more than 2mg / L. The method disclosed by the invention overcomes the bottleneck that the denitrification rate of the traditional A / O process is limited by a reflux ratio; the denitrification rate is high and can achieve 100%; outlet water COD (Chemical Oxygen Demand) is less than 50mg / L; and the method is simple to operate, wide in application range and can be put into industrial implementation easily.

Description

technical field [0001] The invention relates to a method for further denitrification of high ammonia nitrogen wastewater based on the A / O process. Background technique [0002] In order to cope with the deteriorating quality of the water environment and the environmental capacity is almost exhausted, in 2002, my country set the total nitrogen limit of urban sewage treatment plants to be less than 15mg / L (one of the "Pollutant Discharge Standards for Urban Sewage Treatment Plants" GB18918-2002 Grade A standard). In fact, according to the existing research results, when the total nitrogen content is higher than 0.6mg / L, the water body is considered to be in an eutrophic state, so even if the existing total nitrogen discharge standard is met, the sewage entering the natural water body will still increase the eutrophication of the water body. Nutritization. Therefore, nitrogen pollution has risen as the main pollution factor in water pollution, and it is imperative to control t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30C02F101/16
CPCC02F3/302
Inventor 金锡标周思辰卓宁泽罗威威钟楚娴
Owner SHANDONG LUKANG ZHONGHE ENVIRONMENTAL PROTECTION TECH