New nitrogen removal pathways in a full-scale hybrid constructed wetland proposed from high-throughput sequencing and isotopic tracing results

Zhai, Jun; Rahaman, Md. Hasibur; Chen, Xing; Xiao, Hai; Liao, Kaisen; Li, Xiaoting; Duan, Caihong; Zhang, Bao-Yun; Gui-lin, Tao; John, Y.; Vymazal, Jan

doi:10.1016/j.ecoleng.2016.10.045

Cited by 42 publications

(7 citation statements)

References 34 publications

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“…The comparison of the results on nitrogen concentration in the influent and effluent shows a decreasing of the ammonia concentration and an increasing of NO 3 --N in the effluent, justifying the negative removal percentage (Table 1). Similar trend has been reported by Zhai et al [36] and Yang et al [37] on nitrogen removal in constructed wetlands system. The increasing of nitrate in the effluent is mainly related to the microbial-assisted oxidation of ammonia into nitrate (nitrification) [37].…”

Section: Ammonia Nitrogen Removalsupporting

confidence: 89%

Pollutants Removal in Sewage Wastewater Efficiency and Kinetic of Ammonia Nitrogen Removal through Subsurface Vertical Flow Constructed Wetlands (SSVFCW)

Houndedjihou

Kodom

Wolff

et al. 2021

IRJPAC

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Aims: The removal of some pollutants such as ammonia nitrogen, Total Kjeldahl Nitrogen (TKN), chemical oxygen demand (COD), biological oxygen demand (BOD5), phosphate and some solids (total (TS), fixed (TFS) and volatile (TVS)) from sewage wastewater was investigated in vertical subsurface flow constructed wetlands (SSVFCW). Study Design: The bed of the constructed wetland is composed of gravel and Canna indica is used as vegetation. Place and Duration of Study: The study was conducted at the Federal University of Santa Maria, southern Brazil, under subtropical climate from June to September 2019. Methodology: Three kinds of samples of water collected (Raw, septic tank and outlet from the wetland) one time per week were analyzed according to American standards. Anions were analyzed by gas chromatography using 930 compact IC Flex Metrohm. Statistical analysis performed using ANOVA and U test of Mann-Whitneyto investigate the statistical difference were performed by STATISTICA and Origin software. Results: A total of 10 samples of each kind of water were collected and analyzed. In the conditions of this study, the removal percentage is 89.88, 88.00, 84.93, 84.62, 84.31, 72.94, 41.71, 15.63 respectively for COD, TKN, NH4+-N, TVS, BOD5, TS, TFS and PO43--P. Environment temperature, hydraulic retention time have an effect on the performance of the wetlands system. The effect of the contact time shows that adsorption process is a partway of ammonia nitrogen removal in the wetland. Among the three models of kinetic studied to describe the removal of ammonia nitrogen, Stover-Kincannon and second order models showed a better fit than the first order model. Conclusion: The nitrification and adsorption are the principal process of ammonia removal in the wetland. The plant has been found to be very efficient on the removal of ammonia nitrogen, TKN, COD, BOD5 while phosphate removal has been found too weak.

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Section: Ammonia Nitrogen Removalsupporting

confidence: 89%

Pollutants Removal in Sewage Wastewater Efficiency and Kinetic of Ammonia Nitrogen Removal through Subsurface Vertical Flow Constructed Wetlands (SSVFCW)

Houndedjihou

Kodom

Wolff

et al. 2021

IRJPAC

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“…Regarding plant uptake, ammonium preference by macrophytes increases in environments where this nutrient concentration is high (Garnett et al, 2001). Another mechanism that may also account for ammonium decrease is anammox (anaerobic ammonium oxidation) (Gajewska and Ambroch, 2011;Strous et al, 2002;Vymazal, 2007;Wu et al, 2014;Zhai et al, 2016). Considering the mosaic of aerobic and anaerobic zones as well as the usually low dissolved oxygen concentration, CWs are assumed to offer favourable conditions not only for nitrification but also for anammox (Zhu et al, 2010).…”

Section: Field Experiment: Pilot-scale Hwsmentioning

confidence: 99%

Hybrid constructed wetlands for the treatment of wastewater from a fertilizer manufacturing plant: Microcosms and field scale experiments

Maine

Sánchez

Hadad

et al. 2019

Science of The Total Environment

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Wastewater from a fertilizer manufacturing plant requires improvement prior to its environmental disposal. Ammonium is the critical contaminant to be removed. The aim of this study was to evaluate the feasibility of using free water surface wetlands (FWSWs), horizontal subsurface flow wetlands (HSSFWs), and their combination in hybrid wetlands (HWs) for the final treatment of wastewater with high ammonium concentration from a fertilizer manufacturing plant. Substrates and macrophytes were evaluated in microcosm experiments during three months. There were no significant differences in contaminant removal among HSSFWs with LECA or FWSWs planted with Typha domingensis or Canna indica. In a second stage, two configurations of pilot-scale HWs were constructed at the manufacturing facilities. Configuration A: HSSFW(A1)-FWSW(A2) and Configuration B: FWSW(B1)-HSSFW(B2) were evaluated during 12 months. There were no significant differences in contaminant removal (%) between the two configurations of HWs for COD (A: 74.5 ± 12.2/B: 81.5 ± 9.4), ammonium (A: 59.5 ± 17.5/B: 57.9 ± 21.4), nitrite (A: 79.8 ± 24.2/B: 80.6 ± 16.8) and dissolved inorganic nitrogen (DIN) (A: 59.4 ± 17.3/B: 50.3 ± 24.4). However, nitrate concentration (9.83 ± 3.11 mg N L) was significantly lower after Configuration A than after Configuration B (18.8 ± 5.2 mg N L). Comparing FWSWs and HSSFWs, they did not present significant differences in ammonium removal, while FWSWs presented the highest DIN removal. T. domingensis and C. indica in HSSFWs and T. domingensis in FWSWs tolerated wastewater conditions. T. domingensis presented the highest productivity. In further research, FWSWs in series planted with T. domingensis should be studied.

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“…In light of the increasingly stringent nitrogen discharge standards in many parts of the world due to the environmental (e.g. eutrophication) and health hazards (to infants and pregnant women and to livestock) originated from the contamination of surface and groundwater with nitrified effluents (Ward et al, 2005), the enhancement of nitrogen removal from wastewater has become one of the main issues in the development of the CW technology (Pelissari et al, 2017;Wu et al, 2014;Zhai et al, 2016). The complete elimination of the nitrogen content of wastewater (usually relying on the process of nitrification of ammonia nitrogen followed by denitrification of nitrate) remains largely unsatisfactory in passive single-stage CW systems due to their inability to provide both aerobic and anaerobic conditions at the same time.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of total nitrogen removal through effluent recirculation and fate of PPCPs in a hybrid constructed wetland system treating urban wastewater

Ávila

Pelissari

Sezerino

et al. 2017

Science of The Total Environment

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The effect of effluent recirculation on the removal of total nitrogen (TN) and eight pharmaceuticals and personal care products (PPCPs) was evaluated during 9months in an experimental hybrid constructed wetland (CW) system applied in the treatment of urban wastewater. An Imhoff tank was followed by three stages of CWs (two 1.5-m vertical subsurface flow (VF) beds alternating feed-rest cycles, a 2-m horizontal (HF) and a 2-m free water surface (FWS) wetland in series). A fraction of the final effluent was recycled back to the Imhoff tank with a recirculation rate of 50% (hydraulic loading rate=0.37md). The system's performance varied throughout the study. In Period I (summer) consistently high load removal efficiencies of TN (89±5%) and a removal rate of 6.6±1.4gTNmd were exhibited. In Period II (fall), the poor performance of the FWS during the senescence of macrophytes caused a large increase in organic matter, solids and nutrient concentrations, drastically deteriorating water quality. The determination of PPCPs was conducted during this period. Recalcitrant compounds, namely sulfamethoxazole, carbamazapine, TCEP and sucralose were negligibly removed in all CWs. However, noteworthy was the ≈30% removal of sucralose in the VF wetland. Caffeine (80%) and fluoxetine (27%) showed similar elimination rates in both VF and HF units, whereas trimethoprim and DEET were significantly better removed in the VF than in the HF. The concentration of the four latter compounds showed a severe increase in the FWS, indicating possible desorption from the sediment/biomass during adverse conditions. Harvesting of the aboveground biomass in this unit returned the system's performance back to normality (Period III), achieving 77±7% TN removal despite the winter season, proving effluent recirculation as an effective strategy for TN removal in hybrid CW systems when stringent restrictions are in place.

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New nitrogen removal pathways in a full-scale hybrid constructed wetland proposed from high-throughput sequencing and isotopic tracing results

Cited by 42 publications

References 34 publications

Pollutants Removal in Sewage Wastewater Efficiency and Kinetic of Ammonia Nitrogen Removal through Subsurface Vertical Flow Constructed Wetlands (SSVFCW)

Pollutants Removal in Sewage Wastewater Efficiency and Kinetic of Ammonia Nitrogen Removal through Subsurface Vertical Flow Constructed Wetlands (SSVFCW)

Hybrid constructed wetlands for the treatment of wastewater from a fertilizer manufacturing plant: Microcosms and field scale experiments

Enhancement of total nitrogen removal through effluent recirculation and fate of PPCPs in a hybrid constructed wetland system treating urban wastewater

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