Nitrogen removal from pharmaceutical manufacturing wastewater with high concentration of ammonia and free ammonia via partial nitrification and denitrification

2004 ◽  
Vol 50 (6) ◽  
pp. 31-36 ◽  
Author(s):  
Y.Z. Peng ◽  
Y.Z. Li ◽  
C.Y. Peng ◽  
S.Y. Wang
Keyword(s):  
Nitrogen Removal ◽  
Accumulation Rate ◽  
Batch Reactor ◽  
Free Ammonia ◽  
Pharmaceutical Manufacturing ◽  
Partial Nitrification ◽  
High Concentration ◽  
Wastewater Stream ◽  
Nitrification And Denitrification ◽  
Study Laboratory

In this study, laboratory-scale experiments were conducted applying a Sequencing Batch Reactor (SBR) activated sludge process to a wastewater stream from a pharmaceutical factory. Nitrogen removal can be achieved via partial nitrification and denitrification and the efficiency was above 99% at 23°C ± 1. The experimental results indicated that the nitrite oxidizers were more sensitive than ammonia oxidizers to the free ammonia in the wastewater. The average accumulation rate of nitrite was much higher than that of nitrate. During nitrogen removal via the nitrite pathway, the end of nitrification and denitrification can be exactly decided by monitoring the variation of pH. Consequently, on-line control for nitrogen removal from the pharmaceutical manufacturing wastewater can be achieved and the cost of operation can be reduced.

Nitrogen Removal with Nitrification and Denitrification via Nitrite

2014 ◽  
Vol 908 ◽  
pp. 175-178
Author(s):  
Jing Xiao ◽  
Jin Hua Tang
Keyword(s):  
Carbon Source ◽  
Nitrogen Removal ◽  
Ammonia Concentration ◽  
Free Ammonia ◽  
Partial Nitrification ◽  
High Ammonia ◽  
Future Challenges ◽  
Do Concentration ◽  
Nitrification And Denitrification ◽  
Biological Nitrification

Biological nitrification and denitrification via nitrite pathway is technically feasible and economically favorable, especially when wastewater with high ammonium concentrations or low C/N ratios is treated. Therefore, it has attracted more and more attention. It is very important to maintain partial nitrification of ammonium to nitrite. In this paper, the factors that influence operation and efficiency of nitrification and denitrification via nitrite are discussed, including DO concentration, carbon source, aeration pattern, PH, temperature and high free ammonia. High ammonia concentration and temperature are prone to accomplish of short-cut nitrification and denitrification, but limit application in practice. Finally, the review discussed the future challenges for application of short-cut nitrification and denitrification.

scholarly journals Micro-pressure swirl reactor (MPSR) for efficient COD and nitrogen removal of high-concentration wastewater

2020 ◽  
Vol 82 (9) ◽  
pp. 1795-1807 ◽  
Author(s):  
Dejun Bian ◽  
Zebing Nie ◽  
Fan Wang ◽  
Shengshu Ai ◽  
Suiyi Zhu ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Lower Cost ◽  
Batch Reactor ◽  
Oxygen Demand ◽  
Swirl Flow ◽  
High Concentration ◽  
Internal Circulation ◽  
Carbon And Nitrogen ◽  
Pressure Swirl

Abstract A micro-pressure swirl reactor (MPSR) was developed for carbon and nitrogen removal of wastewater, in which dissolved oxygen (DO) gradient and internal circulation could be created by setting the aerators along one side of the reactor, and micro-pressure could be realized by sealing most of the top cap and increasing the outlet water level. In this study, velocity and DO distribution in the reactor was measured, removal performance treating high-concentration wastewater was investigated, and the main functional microorganisms were analyzed. The experiment results indicated that there was stable swirl flow and spatial DO gradient in MPSR. Operated in sequencing batch reactor mode, distinct biological environments spatially and temporally were created. Under the average influent condition of chemical oxygen demand (COD) concentration of 2,884 mg/L and total nitrogen (TN) of 184 mg/L, COD removal efficiency and removal loading was 98% and 1.8 kgCOD/(m3·d) respectively, and TN removal efficiency and removal loading reached up to 90% and 0.11 kgTN/(m3·d) respectively. With efficient utilization of DO and simpler configuration for simultaneous nitrification and denitrification, the MPSR has the potential of treating high-concentration wastewater at lower cost.

Application of a synthetic zeolite as a storage medium in SBRs to achieve the stable partial nitrification of ammonium

2019 ◽  
Vol 5 (2) ◽  
pp. 287-295 ◽  
Author(s):  
Jing Chen ◽  
Xiaojun Wang ◽  
Zhenguo Chen ◽  
Xinghui Feng ◽  
Xiaokun Chen
Keyword(s):  
Synthetic Zeolite ◽  
Free Ammonia ◽  
Partial Nitrification ◽  
Ammonia Oxidizing Bacteria ◽  
Growth Substrate ◽  
Storage Medium ◽  
High Concentration

Free ammonia (FA) is the growth substrate for ammonia-oxidizing bacteria (AOB), but a high concentration of FA could also inhibit AOB activities.

Nitrogen removal from pharmaceutical manufacturing wastewater via nitrite and the process optimization with on-line control

2004 ◽  
Vol 50 (6) ◽  
pp. 25-30 ◽  
Author(s):  
Y.Z. Li ◽  
C.Y. Peng ◽  
Y.Z. Peng ◽  
P. Wang
Keyword(s):  
Nitrogen Removal ◽  
Low Cost ◽  
Selective Inhibition ◽  
Ammonia Removal ◽  
Pharmaceutical Manufacturing ◽  
Biological Nitrogen Removal ◽  
On Line ◽  
Biological Nitrogen ◽  
Study Laboratory ◽  
Easy Operation

In this study, laboratory scale experiments were conducted to investigate the nitrogen removal from pharmaceutical manufacturing wastewater. The results indicate that by selective inhibition of free ammonia on oxidizers, nitrogen removal can be achieved by nitritation and denitritation process. The nitrite ratio was above 98% in the aerobic stage and the nitrogen removal efficiency was about 99%. The complete ammonia removal corresponded exactly to the “Ammonia Valley” in the pH versus time graphic and the anoxic reaction was completed when the “Nitrite Knee” appeared in the ORP versus time graphic. Optimization of the SBR cycle by step-feed and on-line control with pH and ORP strategy allowed the carbon and energy saving. The easy operation and the low cost make the SBR system an interesting option for the biological nitrogen removal from the pharmaceutical manufacturing wastewater.

Partial nitrification and denitrification in a sequencing batch reactor treating high-salinity wastewater

2016 ◽  
Vol 288 ◽  
pp. 207-215 ◽  
Author(s):  
Zonglian She ◽  
Linting Zhao ◽  
Xiaoling Zhang ◽  
Chunji Jin ◽  
Liang Guo ◽  
...  
Keyword(s):  
Sequencing Batch Reactor ◽  
High Salinity ◽  
Batch Reactor ◽  
Partial Nitrification ◽  
Nitrification And Denitrification ◽  
Salinity Wastewater

Effect of chloride concentration on nitrogen removal from landfill leachate in sequencing batch reactor after MAP pretreatment

2010 ◽  
Vol 62 (7) ◽  
pp. 1574-1579 ◽  
Author(s):  
M. Chen ◽  
S. He ◽  
Q. Yi ◽  
M. Yang
Keyword(s):  
Nitrogen Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Chloride Concentration ◽  
Ammonium Phosphate ◽  
High Strength ◽  
High Energy ◽  
High Concentration ◽  
Magnesium Ammonium Phosphate ◽  
Magnesium Ammonium

Leachate generated from landfill is becoming a great environmental challenge to China as it contains high concentration of COD, ammonium and some other substances. Nitrogen removal through the conventional nitrification-denitrification process is hampered by the low C/N ratio especially for the old age landfill sites and the high energy consumption for aeration. In this study, the combination of magnesium ammonium phosphate (MAP) precipitation and Sequencing batch reactor (SBR) was suggested as a new process for the treatment of high strength ammonium, and the effect of high concentration of Cl− after MAP precipitation because of the use of MgCl2 was investigated on SBR performance. The practical upper limit of Cl− for nitrification was found to be 12,000 mg/L, above which resulted in significant accumulation of ammonium in SBR system. It is suggested that an ammonium removal of 70% was suitable for the MAP treatment to achieve a balance between increasing the C/N ratio and avoiding detrimental effect from high concentration of Cl− in the succeeding SBR system. DGGE analysis indicated that high diversity of Ammonium oxidizing bacteria (AOB) could be maintained at a Cl− concentration of 12,000 mg/L.

Combined treatment of landfill leachate and domestic sewage in a sequencing batch reactor

1997 ◽  
Vol 36 (2-3) ◽  
pp. 61-68 ◽  
Author(s):  
E. Diamadopoulos ◽  
P. Samaras ◽  
X. Dabou ◽  
G. P. Sakellaropoulos
Keyword(s):  
Nitrogen Removal ◽  
Landfill Leachate ◽  
Batch Reactor ◽  
Nitrate Removal ◽  
Combined Treatment ◽  
Municipal Sewage ◽  
Comparative Performance ◽  
Treated Effluent ◽  
Activated Sludge Reactor ◽  
Nitrification And Denitrification

A study was undertaken to examine the feasibility of biologically treating a combined waste stream of landfill leachate and municipal sewage. The ratio of sewage to leachate was 9 to 1 by volume. The combined waste had an average BOD5 430 mg/l, COD 1090 mg/l, and TKN 133 mg/l (80% of which was in the form of ammonia). A laboratory-scale sequencing batch activated sludge reactor was used to carry comparative performance evaluations of biological treatment, including nitrification and denitrification. The SBR reactor was operating in daily time cycles employing the following sequential operation phases: filling phase, anoxic phase, aeration reaction phase, settling phase, and drain phase. In particular, the anoxic and aeration periods were tailored in order to develop conditions conducive to desired nitrification and denitrification. During the reaction period, the process was operated under an extended aeration mode with the MLSS concentration being around 3500 mg/l. The results indicated that successful biotreatment of combined leachate and sewage was possible, with the treated effluent being low in BOD5 and COD. The system was capable of BOD5 removal efficiencies exceeding 95%. Furthermore, nitrate removal during the anoxic phase was approximately 99% due to denitrification. However, the overall nitrogen removal during a full cycle was about 50%. The inclusion of an anoxic period right after the aeration phase enhanced the nitrogen removal efficiency, yet this phase required the addition of an external carbon source to the reactor due to the low concentration of biodegradable carbon, and at the same time the process became less efficient in BOD removal.

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