Effect of recirculation on nitrogen removal in a hybrid constructed wetland system

Ayaz, Selma; Aktaş, Özgür; Findik, N.; Akça, Lütfi; Kinaci, Cumali

doi:10.1016/j.ecoleng.2011.12.028

Cited by 88 publications

(33 citation statements)

References 15 publications

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“…The NH 4 + -N was reduced significantly in all three systems (p < 0.05) with a higher similar decrease in the HF-VF and VF-HF systems. These results support the findings by other authors with respect to the important role that vertical flow CWs plays for treating high-ammonia wastewater [15]. The reduction of ammonium concentrations was achieved mainly in the VF unit (>80%), regardless of position in the HEWTs.…”

Section: Ammoniumsupporting

confidence: 82%

Comparative Study of Three Two-Stage Hybrid Ecological Wastewater Treatment Systems for Producing High Nutrient, Reclaimed Water for Irrigation Reuse in Developing Countries

Zurita

White

2014

Water

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In this study, three different two-stage hybrid ecological wastewater treatment systems (HEWTS) with combinations of horizontal flow (HF) constructed wetlands (CWs), vertical flow (VF) CWs and stabilization ponds (SP) were evaluated for the removal of Organic-N, NH 4 + , NO 3 − , Total N, Total P, Total Coliforms (TCol) and Escherichia Coli, BOD, COD and TSS. The overall goal of the study was novel in comparison to most other studies in that we sought to evaluate and compare the efficiency of the three HEWTSs for water quality improvements, while minimizing nutrient removal from the wastewater in order to generate high quality reclaimed water for reuse for irrigation of crops. The most effective systems were those systems containing a vertical flow component, either HF-VF or VF-HF. In these two HEWTS, NH 4 + was reduced by 85.5% and 85.0% respectively, while NO 3 − was increased to 91.4 ± 17.6 mg/L and to 82.5 ± 17.2 mg/L, respectively, an artifact of nitrification. At the same time, E. coli was reduced by 99.93% and 99.99%, respectively. While the goal of most wastewater treatment is focused on reducing nutrients, the results here demonstrate that two-stage HEWTSs containing VF components can be used to produce a high quality effluent while retaining inorganic nutrients, thereby conserving this valuable resource for reuse as irrigation water for agriculture in subtropical developing countries where water and fertilizer resources are scarce or expensive.

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Section: Ammoniumsupporting

confidence: 82%

Comparative Study of Three Two-Stage Hybrid Ecological Wastewater Treatment Systems for Producing High Nutrient, Reclaimed Water for Irrigation Reuse in Developing Countries

Zurita

White

2014

Water

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“…The removal rates of NH 4 -N for VBB were high, presumably due to the recycling of wastewater. The recirculation enhances nitrification and denitrification as noted by Brix and Arias (2005b) and Ayaz et al (2012). Also, clinker ash neutralized the low pH water and that may have allowed the nitrification to take place.…”

Section: Resultsmentioning

confidence: 98%

Performance evaluation of hybrid treatment wetland for six years of operation in cold climate

Harada

Inoue

Kato

et al. 2014

Environ Sci Pollut Res

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In Hokkaido, northern Japan, there are 12 hybrid subsurface constructed wetlands (HSCWs) and most of them are treating high concentrated organic wastewater. One of these systems is an HSCW situated in Embetsu, northern Hokkaido and it has been in operation since November of 2006 to treat dairy milking parlor wastewater. The system is composed of two vertical flow beds and a horizontal flow bed. The inflow and the outflow's flow rates and pollutant concentrations and loads were extremely variable. Throughout its six years of operation, most of the pollutant removals were decently high. Removal efficiencies for COD, BOD 5 and SS were ranging in the 90%. Removal efficiencies for TN, NH 4 -N, and BOD 5 were improving because of the development of the soil ecosystem and the Phragmites australis community. However, the removal rates of TP were decreasing, presumably because of the declining adsorption ability. The accumulation of TP in the first and the second vertical beds had reached its plateau. Vertical beds had high removal efficiencies for TN, COD, BOD 5 and SS. These high removal rates of the first vertical bed may be caused from the efficient removal of solid material that is deposited as an organic layer of the first vertical bed. High NH 4 -N removal rates exerted by the second vertical bed may be due to the recycling of wastewater. In conclusion, the HSCW was working excellently for its six years of operation, and it could be concluded that it has not reached its life yet.

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“…The comparatively high removal rate of the comparison system (b) shows that the removal efficiency of constructed wetlands with a variety of substrates configurations are less affected by the influent pollution load, own to the synergistic effect among various substrates [11]. Some research results [12][13][14][15][16] show that the removal rates of NH4 + -N and TN are 57%~71% and 50%~75% in composite constructed wetland, respectively. Relative to the original system (a), the removal effect is relatively stable but the average removal rate is lower, the removal rate of the original system (a) is not stable may be related to the single configuration of the substrates.…”

Section: Study On the Pollutant Removal Of Pilot Project Coupling Sysmentioning

confidence: 99%

Study on the Enhanced Operation of Self-Ventilation-Based Coupling System for Domestic Wastewater Treatment

Kong

Wang²,

Zeng

et al. 2018

E3S Web Conf.

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Abstract. In this study, a new coupling system of biological filter bed and subsurface-flow constructed wetland based on the self-ventilation network was proposed, and the comparative pollutant removal efficiency at low and high influent concentration of the pilot coupling system with different substrates configurations were investigated. The study found that: The comparison system (b) had better removal rates than that of the original system (a), and the removal rate when treating low influent concentration was 74.10%, 94.14%, 73.57% and 69.53%, while in high influent concentration case was 81.30%, 90.28%, 88.57% and 75.36% for CODCr, NH4 + -N, TN and TP, respectively. The removal of the above main water indexes of the comparison system (b) promoted by 11.00%, 11.55%, 2.69% and 8.09% respectively in low influent concentration case and 4.20%, 9.20%, 7.66% and 13.61% respectively in high influent concentration case when comparing to the original system (a), which showed that the optimized configuration of various kinds of substrates was significant and was more beneficial to the degradation and removal of pollutants. The adsorption and interception function of substrates in the constructed wetland was the main way of phosphorus removal. The function of self-ventilation ensured the amount of DO in the coupling system, making the phosphorus removal was less affected comparing to structure of traditional wetland.

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Effect of recirculation on nitrogen removal in a hybrid constructed wetland system

Cited by 88 publications

References 15 publications

Comparative Study of Three Two-Stage Hybrid Ecological Wastewater Treatment Systems for Producing High Nutrient, Reclaimed Water for Irrigation Reuse in Developing Countries

Comparative Study of Three Two-Stage Hybrid Ecological Wastewater Treatment Systems for Producing High Nutrient, Reclaimed Water for Irrigation Reuse in Developing Countries

Performance evaluation of hybrid treatment wetland for six years of operation in cold climate

Study on the Enhanced Operation of Self-Ventilation-Based Coupling System for Domestic Wastewater Treatment

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