Effects of effluent recycle on treatment performance in a vertical flow constructed wetland

C. A. Arias; D. Istenic; O. Stein; X. Zhai; R. Kilian; I. Vera-Puerto; H. Brix

doi:10.1016/j.ecoleng.2022.106675

Effects of effluent recycle on treatment performance in a vertical flow constructed wetland

C. A. Arias^*, D. Istenic, O. Stein, X. Zhai, R. Kilian, I. Vera-Puerto, H. Brix

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

6 Citations (Scopus)

Abstract

As part of the effort to improve design and operation schemes of decentralized wastewater systems, the Danish EPA funded a research initiative, to re-evaluate the Danish guidelines for VFCW with an aim to improve its design. Therefore, the aim of this study is to assess the effect of recycling water from the effluent of the VFCW to the pump chamber at several recycle ratios and to compare the effects of recycle to the sedimentation tank in lieu of the pump chamber. In addition, water quality changes within the depth of the bed were assessed in order to make recommendations on an appropriate depth for effective treatment. The results showed overall the system performed very well regardless of the recycle ratio with removal rates of TSS, TOC, BOD₅, NH₄-N and TP around 99% and thus easily exceeding the national discharge requirements. Despite that, the better results for TN effluent concentrations, below 45 mg/L, were achieved for recycling water from the effluent of VFCW to pump chamber at recirculation rates of 50% to 100%. The changes in concentrations of measured parameters with depth suggest that almost all transformations occurred with the top 20 cm of the 1.0 m thick effective bed depth, thus, the results show that the VFCW dimensions given in the Danish guidelines may be overdesigned from the perspective of meeting current discharge limits.

Original language	English
Article number	106675
Journal	Ecological Engineering
Volume	180
ISSN	0925-8574
DOIs	https://doi.org/10.1016/j.ecoleng.2022.106675
Publication status	Published - Jul 2022

Keywords

Decentralized wastewater treatment
Denitrification
Nitrification
Nitrogen
Nutrient
Oxygen consumption rates
Phosphorous
Treatment optimization

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10.1016/j.ecoleng.2022.106675

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@article{7572ac5ef1e544cb9eb0a776059073f7,

title = "Effects of effluent recycle on treatment performance in a vertical flow constructed wetland",

abstract = "As part of the effort to improve design and operation schemes of decentralized wastewater systems, the Danish EPA funded a research initiative, to re-evaluate the Danish guidelines for VFCW with an aim to improve its design. Therefore, the aim of this study is to assess the effect of recycling water from the effluent of the VFCW to the pump chamber at several recycle ratios and to compare the effects of recycle to the sedimentation tank in lieu of the pump chamber. In addition, water quality changes within the depth of the bed were assessed in order to make recommendations on an appropriate depth for effective treatment. The results showed overall the system performed very well regardless of the recycle ratio with removal rates of TSS, TOC, BOD5, NH4-N and TP around 99% and thus easily exceeding the national discharge requirements. Despite that, the better results for TN effluent concentrations, below 45 mg/L, were achieved for recycling water from the effluent of VFCW to pump chamber at recirculation rates of 50% to 100%. The changes in concentrations of measured parameters with depth suggest that almost all transformations occurred with the top 20 cm of the 1.0 m thick effective bed depth, thus, the results show that the VFCW dimensions given in the Danish guidelines may be overdesigned from the perspective of meeting current discharge limits.",

keywords = "Decentralized wastewater treatment, Denitrification, Nitrification, Nitrogen, Nutrient, Oxygen consumption rates, Phosphorous, Treatment optimization",

author = "Arias, {C. A.} and D. Istenic and O. Stein and X. Zhai and R. Kilian and I. Vera-Puerto and H. Brix",

note = "Publisher Copyright: {\textcopyright} 2022",

year = "2022",

month = jul,

doi = "10.1016/j.ecoleng.2022.106675",

language = "English",

volume = "180",

journal = "Ecological Engineering",

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T1 - Effects of effluent recycle on treatment performance in a vertical flow constructed wetland

AU - Arias, C. A.

AU - Istenic, D.

AU - Stein, O.

AU - Zhai, X.

AU - Kilian, R.

AU - Vera-Puerto, I.

AU - Brix, H.

PY - 2022/7

Y1 - 2022/7

N2 - As part of the effort to improve design and operation schemes of decentralized wastewater systems, the Danish EPA funded a research initiative, to re-evaluate the Danish guidelines for VFCW with an aim to improve its design. Therefore, the aim of this study is to assess the effect of recycling water from the effluent of the VFCW to the pump chamber at several recycle ratios and to compare the effects of recycle to the sedimentation tank in lieu of the pump chamber. In addition, water quality changes within the depth of the bed were assessed in order to make recommendations on an appropriate depth for effective treatment. The results showed overall the system performed very well regardless of the recycle ratio with removal rates of TSS, TOC, BOD5, NH4-N and TP around 99% and thus easily exceeding the national discharge requirements. Despite that, the better results for TN effluent concentrations, below 45 mg/L, were achieved for recycling water from the effluent of VFCW to pump chamber at recirculation rates of 50% to 100%. The changes in concentrations of measured parameters with depth suggest that almost all transformations occurred with the top 20 cm of the 1.0 m thick effective bed depth, thus, the results show that the VFCW dimensions given in the Danish guidelines may be overdesigned from the perspective of meeting current discharge limits.

AB - As part of the effort to improve design and operation schemes of decentralized wastewater systems, the Danish EPA funded a research initiative, to re-evaluate the Danish guidelines for VFCW with an aim to improve its design. Therefore, the aim of this study is to assess the effect of recycling water from the effluent of the VFCW to the pump chamber at several recycle ratios and to compare the effects of recycle to the sedimentation tank in lieu of the pump chamber. In addition, water quality changes within the depth of the bed were assessed in order to make recommendations on an appropriate depth for effective treatment. The results showed overall the system performed very well regardless of the recycle ratio with removal rates of TSS, TOC, BOD5, NH4-N and TP around 99% and thus easily exceeding the national discharge requirements. Despite that, the better results for TN effluent concentrations, below 45 mg/L, were achieved for recycling water from the effluent of VFCW to pump chamber at recirculation rates of 50% to 100%. The changes in concentrations of measured parameters with depth suggest that almost all transformations occurred with the top 20 cm of the 1.0 m thick effective bed depth, thus, the results show that the VFCW dimensions given in the Danish guidelines may be overdesigned from the perspective of meeting current discharge limits.

KW - Decentralized wastewater treatment

KW - Denitrification

KW - Nitrification

KW - Nitrogen

KW - Nutrient

KW - Oxygen consumption rates

KW - Phosphorous

KW - Treatment optimization

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DO - 10.1016/j.ecoleng.2022.106675

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SN - 0925-8574

VL - 180

JO - Ecological Engineering

JF - Ecological Engineering

M1 - 106675

ER -

Effects of effluent recycle on treatment performance in a vertical flow constructed wetland

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Keywords

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