Resilience of carbon and nitrogen removal due to aeration interruption in aerated treatment wetlands

Abstract Despite recent developments in process-based modeling of treatment wetlands (TW), the dynamic response of horizontal flow (HF) aerated wetlands to interruptions of aeration has not yet been modeled. In this study, the dynamic response of organic carbon and nitrogen removal to interruptions of aeration in an HF aerated wetland was investigated using a recently-developed numerical process-based model. Model calibration and validation were achieved using previously obtained data from pilot-scale experiments. Setting initial concentrations for anaerobic bacteria to high values ( 35–70 mg L−1) and including ammonia sorption was important to simulate the treatment performance of the experimental wetland in transition phases when aeration was switched off and on again. Even though steady-state air flow rate impacted steady-state soluble chemical oxygen demand (CODs), ammonia nitrogen (NH4–N) and oxidized nitrogen (NOx–N) concentration length profiles, it did not substantially affect corresponding effluent concentrations during aeration interruption. When comparing simulated with experimental results, it is most likely that extending the model to include mass transfer through the biofilm will allow to better explain the underlying experiments and to increase simulation accuracy. This study provides insights into the dynamic behavior of HF aerated wetlands and discusses assumptions and limitations of the modeling approach.

Download Full-text

Effect of trickling filter on carbon and nitrogen removal in vertical flow treatment wetlands: A full-scale investigation

Journal of Environmental Management ◽

10.1016/j.jenvman.2021.114159 ◽

2022 ◽

Vol 303 ◽

pp. 114159

Author(s):

Kevin Maciejewski ◽

Mathieu Gautier ◽

Boram Kim ◽

Philippe Michel ◽

Rémy Gourdon

Keyword(s):

Nitrogen Removal ◽

Full Scale ◽

Treatment Wetlands ◽

Vertical Flow ◽

Trickling Filter ◽

Carbon And Nitrogen ◽

Flow Treatment

Download Full-text

Evaluation of sequencing batch bioreactor followed by media filtration for organic carbon and nitrogen removal in produced water

Journal of Water Process Engineering ◽

10.1016/j.jwpe.2020.101863 ◽

2021 ◽

Vol 40 ◽

pp. 101863

Author(s):

Emily R. Nicholas ◽

Tzahi Y. Cath

Keyword(s):

Organic Carbon ◽

Nitrogen Removal ◽

Produced Water ◽

Carbon And Nitrogen ◽

Batch Bioreactor

Download Full-text

Screening and Influencing Factors of Halophilic Denitrifying Bacteria

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.550-553.1455 ◽

2012 ◽

Vol 550-553 ◽

pp. 1455-1459

Author(s):

Jing Tang ◽

Hong Ming E ◽

Jin Xiang Fu ◽

Jin Nan Chen ◽

Ming Fan

Keyword(s):

Nitrogen Removal ◽

Morphological Characteristics ◽

Development Trend ◽

Denitrifying Bacteria ◽

High Salt ◽

Research Progress ◽

Saline Wastewater ◽

Carbon And Nitrogen ◽

Petroleum Chemical ◽

Seafood Processing

With nitrite or nitrate nitrogen as electron acceptor in the high salt conditons, halophilic denitrifying bacteria can transfer nitrite or nitrate to nitrogen, thereby purifying the high-salt wastewater. Halophilic denitrifying bacteria play an important role in the carbon and nitrogen removal of saline wastewater, such as petroleum, chemical industry, seafood processing and seafood farming. This article dissussed halophilic denitrifying bacteria screening, the main types and the corresponding morphological characteristics, then we focused on the research progress of main factors of halophilic denitrifying bacteria’s growth and nitrogen removal. Finally put forward the current problems of the research and development trend of halophilic denitrifying bacteria.

Download Full-text

Different Types of Microbial Fuel Cell (MFC) Systems for Simultaneous Electricity Generation and Pollutant Removal

Jurnal Teknologi ◽

10.11113/jt.v74.4544 ◽

2015 ◽

Vol 74 (3) ◽

Author(s):

S. M. Zain ◽

N. L. Ching ◽

S. Jusoh ◽

S. Y. Yunus

Keyword(s):

Nitrogen Removal ◽

Continuous Flow ◽

Electricity Generation ◽

Pollutant Removal ◽

Flow Mode ◽

Oxidizing Agent ◽

Batch Mode ◽

Carbon And Nitrogen ◽

Different Types ◽

The Relationship

The aim of this study is to identify the relationship between the rate of electricity generation and the rate of carbon and nitrogen removal from wastewater using different MFC processes. Determining whether the generation of electricity using MFC process could be related to the rate of pollutant removal from wastewater is noteworthy. Three types of MFC process configurations include the batch mode (SS), a continuous flow of influent with ferricyanide (PF) as the oxidizing agent and a continuous flow of influent with oxygen (PU) as the oxidizing agent. The highest quantity of electricity generation was achieved using the continuous flow mode with ferricyanide (0.833 V), followed by the continuous flow mode with oxygen (0.589 V) and the batch mode (0.352 V). The highest efficiency of carbon removal is also achieved by the continuous flow mode with ferricyanide (87%), followed by the continuous flow mode with oxygen (51%) and the batch mode (46%). Moreover, the continuous flow mode with ferricyanide produced the highest efficiency for nitrogen removal (63%), followed by the continuous flow mode with oxygen (54%) and the batch mode (27%).

Download Full-text

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

Water Science & Technology ◽

10.2166/wst.2020.454 ◽

2020 ◽

Vol 82 (9) ◽

pp. 1795-1807 ◽

Cited By ~ 1

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.

Download Full-text