Quantifying the hydraulic performance of treatment wetlands using the moment index

Wahl, Mark; Brown, L. C.; Soboyejo, Alfred; Martin, Jay F.; Dong, Bin

doi:10.1016/j.ecoleng.2010.07.014

Cited by 67 publications

(24 citation statements)

References 18 publications

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“…Still, many published wetland salt tracer studies do not give enough details about tracer injection methods (Dal Cin and Bendoricchio, 2002;Persson, 2005;Ronkanen and Kløve, 2007;Speer et al, 2009;Wahl et al, 2010). Thus, in some salt tracer studies, insufficient tracer mass recoveries could be associated with flaws in tracer injection methods.…”

Section: Introductionmentioning

confidence: 99%

Tracer behaviour and analysis of hydraulics in experimental free water surface wetlands

Bodin

Mietto

Ehde

et al. 2012

Ecological Engineering

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Section: Introductionmentioning

confidence: 99%

Tracer behaviour and analysis of hydraulics in experimental free water surface wetlands

Bodin

Mietto

Ehde

et al. 2012

Ecological Engineering

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“…Flow is never uniform across the width and depth of a wetland so that water may remain longer in certain locations and move faster through others. A good design includes features to minimise this short-circuiting and ensure good mixing within the wetland (Wahl et al, 2010). The analysis of residence time distribution functions originating from tracer studies is one of the main tools for the assessment of hydraulic performance of wetlands.…”

Section: Hydraulic Residence Time and Hydraulic Loading Ratesmentioning

confidence: 99%

उपचार आर्द्रभूमियााँ

Dotro¹,

Langergraber²,

Molle³

et al. 2021

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उपचार आर्द्रभूमियााँ ‘जैविक अपमिष्ट जल’ िें सातिाृं खृंड है उपचार श्ृंखर ला, जो सीिेज उपचार के विज्ञान और तकनीक की अत्याधुननक प्रस्तुनत देती है। आर्द्रभूमि प्रणामलयों के प्रिुख प्रकार इस खृंड िें िामिल हैं, नाितः: (i) क्षैनतज प्रिाह आर्द्रभूमि; (ii) ऊध्िारधर प्रिाह आर्द्रभूमि; (iii) फ्रें च ऊध्िारधर प्रिाह आर्द्रभूमि; (iv) सघन आर्द्रभूमि; (v) िुक्त जल सतह आर्द्रभूमि; (vi) उपचार आर्द्रभूमि के अन्य अनुप्रयोि। पुस्तक िुख्य अिधारणाओृं, कािकाजी मसद्धाृंतों, अपेक्षक्षत प्रदिरन, डडजाइन िानदृंड, डडजाइन उदाहरण, ननिारण पहलुओृं और पररचालन द्रदिाननदेिों को स्पष्ट और उपचारात्िक तरीके से प्रस्तुत करती है। पुस्तक को उपचार के क्षेत्र के िीर्र वििेर्ज्ञों की एक अृंतरराष्रीय टीि ने मलखा है। श्ृंखर ला के बारे िें: इस बहुप्रिृंमसत श्ृंखर ला िें सात पाठ्यपुस्तकें िामिल हैं - वप्रटृं िें या िुक्त-अमभिि ई-पुस्तकों के रूप िें उपलब्लध - जो जैविक अपमिष्ट जल उपचार के विज्ञान और तकनीक की एक अत्याधुननक प्रस्तुनत प्रदान करती हैं। विकमसत और विकासिील देिों िें छात्रों, िोधकतारओृं और अभ्यासकों द्िारा श्ृंखर ला के सभी खण्डों का व्यापक रूप से उपयोि क्रकया िया है। जैविक अपमिष्ट जल उपचार श्ृंखर ला िें िीर्कर हैं: खृंड 1: अपमिष्ट जल के लक्षण, उपचार और ननपटानखृंड 2: अपमिष्ट जल उपचार के िूल मसद्धाृंतखृंड 3: अपमिष्ट स्स्िरीकरण तालाबखृंड 4: अिायािीय ररएक्टरखृंड 5: सक्रिय कीचड़ और िायुजीिी बायोक्रिल्ि ररएक्टरखृंड 6: कीचड़ उपचार और ननपटानखृंड 7: उपचार आर्द्रभूमियााँ आईएसबीएन: 9781780408767 (पेपरबैक) आईएसबीएन: 9781789062564 (ई-पुस्तक)

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“…Hydraulic indices reliant on mean residence time or variance are heavily influenced by the long tails of measured RTDs, which can lead to the over prediction of residence time [33]. The moment index, developed by Wahl et al [33], overcomes this problem as it is derived from the prenominal portion (i.e., data collected prior to t n ) of the RTD only.…”

Section: Modelling Scenarios and Analysismentioning

confidence: 99%

“…The moment index, developed by Wahl et al [33], overcomes this problem as it is derived from the prenominal portion (i.e., data collected prior to t n ) of the RTD only. The moment index (MI) as defined by Wahl et al [33] is as follows:…”

Section: Modelling Scenarios and Analysismentioning

confidence: 99%

“…In this study, by determining key hydraulic indices from model flows in ponds with different baffle configurations, the most effective configurations for this particular site could be readily determined. While the short-circuiting index has been used to assess different pond layouts previously e.g., [22], the use of the moment index is new in its application to WSPs [34,35], and provides an index that is not reliant on mixing or short-circuiting, or influenced by the long tails characteristic of most residence time distributions [33]. In this study, we for the first time used a suite of three hydraulic indices (t mean , MI and S), all describing different but complementary aspects of hydraulic efficiency, to better assess the overall behaviour of ponds.…”

Section: Determination Of Optimal Baffle Configurationmentioning

confidence: 99%

See 1 more Smart Citation

Impact of Hydrodynamic Reconfiguration with Baffles on Treatment Performance in Waste Stabilisation Ponds: A Full-Scale Experiment

Coggins

Sounness

Zheng

et al. 2018

Water

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Abstract:Wastewater infrastructure is expensive to build and maintain, and there is a need to focus on improving and modernising existing infrastructure before large capital investments are made to service future population needs. Waste stabilisation ponds (WSPs) are used worldwide for the treatment of wastewater, but their performance is significantly affected by poor hydraulic control. Hydraulic reconfiguration of ponds is a possible solution to this problem, whereby the flow is controlled and short-circuiting is reduced. There is evidence to suggest that this approach has the potential to increase treatment performance, however in the absence of full-scale validation it is difficult to generalise this to a wide range of sites. For example, there is no consensus on the best baffle configuration to optimise hydraulic performance. The main objective of this study was to conduct a full-scale experiment of baffles in a WSP, and to investigate their impact on hydraulic performance. To achieve this objective, the approach combined high-resolution pond bathymetry and 2D hydrodynamic modelling, assessed with hydraulic indices, to determine the optimal baffle configuration for the site; it was shown that three baffles perpendicular to the inflow provided the greatest increase (up to 24%) in mean residence time. This configuration was then implemented in a working WSP. The effects of the baffles on the pond were then assessed using a combination of field tracer testing, revealing an increase in mean residence time of at least 20%, and further hydrodynamic modelling. Through the addition of wind data into the hydrodynamic model, it is shown that baffles not only improve the flow, but also attenuate the effect of wind on pond hydraulics. While the conclusions of this study are site-specific, the implementation of site-specific solutions is important for progress towards optimal pond design. The approach developed here is easily transferrable for use on other sites, and will enhance our ability to plan, design and operate WSP systems in the future.

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Quantifying the hydraulic performance of treatment wetlands using the moment index

Cited by 67 publications

References 18 publications

Tracer behaviour and analysis of hydraulics in experimental free water surface wetlands

Tracer behaviour and analysis of hydraulics in experimental free water surface wetlands

उपचार आर्द्रभूमियााँ

Impact of Hydrodynamic Reconfiguration with Baffles on Treatment Performance in Waste Stabilisation Ponds: A Full-Scale Experiment

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