A method for the in-situ determination of the hydraulic conductivity of gravels as used in constructed wetlands for wastewater treatment

Knowles, Paul; Davies, Philip A.

doi:10.5004/dwt.2009.548

Cited by 32 publications

(23 citation statements)

References 17 publications

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“…A schematic of the hydraulic profile in a horizontal subsurface flow constructed wetland with flat bottom (no slope) is shown in Figure 2.3. Unfortunately, it is difficult to measure hydraulic conductivity in treatment wetlands (Knowles and Davies, 2009;Knowles et al, 2010;Matos et al, 2017). The hydraulic conductivity of the bed medium is highest at start-up, when the medium is relatively clean, and decreases with time as plant roots, microbial biofilms and chemical precipitates gradually occupy spaces that were initially filled with water.…”

Section: Hf Wetland Momentummentioning

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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Section: Hf Wetland Momentummentioning

confidence: 99%

उपचार आर्द्रभूमियााँ

Dotro¹,

Langergraber²,

Molle³

et al. 2021

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“…Alternatively, the VSSF and HSSF CW can be applied to treat relatively weak wastewater such as municipal wastewaters [8,9]. Treatment capacity of VSSF CWs and HSSF CWs are comparatively small due to clogging problems in the pores of media [10].…”

Section: (2012) 9-16 Octobermentioning

confidence: 99%

Seasonal treatment efficiency of surface flow constructed wetland receiving high nitrogen content wastewater

Lee¹,

Maniquiz²,

Choi³

et al. 2012

Desalination and Water Treatment

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A B S T R AC TThis research investigated the performance of a constructed wetland (CW) that functions as a post-treatment unit for the secondary effl uent of a piggery wastewater treatment facility. The pollutant mass removal effi ciency was evaluated from 37 sampling events on non-rainy days during 2008-2010. Based on the fi ndings, the pollutant concentrations decreased somewhat along the cells from the infl uent to the effl uent while DO and pH increased along the cells and appeared to peak at the deep marsh region during the spring season. The overall cumulative treatment effi ciencies for the entire monitoring period were 53% for total suspended solids; 35-37% for biological oxygen demand and chemical oxygen demand; 33% for total phosphorous; and 17-21% for total nitrogen and other nitrogen forms. The main reason for the low treatment performance was att ributed to the low carbon to nutrient ratio (i.e., the COD/BOD:TN:TP ratio) in the CW infl uent. Moreover, algal bloom was frequently observed in the deep marsh region primarily due to the relatively long retention time at the open water zones in the CW. To further improve the treatment performance of the CW treating secondary piggery wastewater, it is necessary to ensure that the infl uent characteristics meet the desirable organics and nutrient requirements to maximize the biological functions of the wetland.

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“…The low removal efficiency has been attributed to several reasons, including incomplete understanding of the purification mechanisms (Haberl et al, 2003;Imfeld et al, 2009) and the nonhomogeneous distribution of the porous substrate. This latter leads to poor hydrodynamic behavior of the system, which results from a broad distribution of the hydraulic residence time (HRT) and associated preferential flow paths (Suliman et al, 2005;Knowles et al, 2008;Mena et al, 2008;Ascuntar-Rios et al, 2009). This aspect appears to be critical in particular for HSCWs where the treatment efficiency decreases significantly compared with vertical systems (Matamoros et al, 2007b(Matamoros et al, , 2008.…”

Section: Introductionmentioning

confidence: 99%

Design methodology accounting for the effects of porous medium heterogeneity on hydraulic residence time and biodegradation in horizontal subsurface flow constructed wetlands

Brovelli

Carranza-Díaz

Rossi

et al. 2011

Ecological Engineering

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Horizontal flow constructed wetlands are engineered systems capable of eliminating a wide range of pollutants from the aquatic environment. Nevertheless, poor hydrodynamic behavior is commonly found resulting in preferential pathways and variations in both (i) the hydraulic residence time distribution (HRTD) and, consequently, (ii) the wetland's treatment efficiency. The aim of this work was to outline a methodology for wetland design that accounts for the effect of heterogeneous hydraulic properties of the porous substrate on the HRTD and treatment efficiency. Biodegradation of benzene was used to illustrate the influence of hydraulic conductivity heterogeneity on wetland efficiency. Random, spatially correlated hydraulic conductivity fields following a log-normal distribution were generated

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A method for the in-situ determination of the hydraulic conductivity of gravels as used in constructed wetlands for wastewater treatment

Cited by 32 publications

References 17 publications

उपचार आर्द्रभूमियााँ

उपचार आर्द्रभूमियााँ

Seasonal treatment efficiency of surface flow constructed wetland receiving high nitrogen content wastewater

Design methodology accounting for the effects of porous medium heterogeneity on hydraulic residence time and biodegradation in horizontal subsurface flow constructed wetlands

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