Microbial mechanisms of carbon removal in subsurface flow wetlands

Baptista, Joana de C.; Donnelly, Tom; Rayne, D; Davenport, Russell J.

doi:10.2166/wst.2003.0298

Cited by 61 publications

(39 citation statements)

References 16 publications

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“…Under these anoxic conditions and when nitrate is available, denitrification can be a predominant organic matter degradation pathway in TWs, especially in HF wetlands (García et al, 2004). Denitrification has been shown to account for a large fraction of total organic carbon removal in HF wetlands (Baptista et al, 2003). However, nitrate availability is often problematic as it is typically not present in appreciable quantities in the influent and cannot be generated by autotrophic nitrification until sufficient organic matter has been removed.…”

Section: Denitrificationmentioning

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: Denitrificationmentioning

confidence: 99%

उपचार आर्द्रभूमियााँ

Dotro¹,

Langergraber²,

Molle³

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In SSF CW organic matter is removed by means of physical, chemical and biological processes that occur naturally and simultaneously within the treatment bed. Although subsurface constructed wetlands are systems subjected to great spatial redox variations (especially in depth) (García et al 2003) they are considered to be mainly anaerobic (Baptista, 2003) and, therefore, methane emission takes place during the wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Effect of primary treatment and organic loading on methane emissions from horizontal subsurface flow constructed wetlands treating urban wastewater

Corbella

Puigagut

2015

Ecological Engineering

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Methane is emitted in horizontal subsurface flow constructed wetlands (SSF CW) during wastewater treatment. The objective of this work was to determine the influence of primary treatment and organic loading rate on methane emissions from constructed wetlands. To this aim methane emissions from a SSF CW pilot plant were measured using the closed chamber method. The effect of primary treatment was addressed by comparing emissions from wetlands operated either with an anaerobic (HUSB reactor) and with or a conventional settler as primary treatments. Alternatively, the effect of organic loading was addressed by comparing emissions from wetlands operated under high organic loading (52 g COD.m -2 .day -1 ) and low organic loading (17 g COD.m -2 .day -1 ). Results suggest that SSF CW redox status at the middle part of the treatment bed (15 cm depth) is of high reduced nature, regardless the type of primary treatment or organic loading applied. However, redox conditions on the upper part of the wetlands (5 cm depth) are especially affected by the type of primary treatment implemented. Accordingly, significantly lower redox conditions at 5 cm depth in wetlands receiving HUSB effluents are recorded which, in turn, resulted in significant lower organic matter removal efficiencies. Moreover, methane emission rates are affected by the type of primary treatment and, to a lesser extent, by the organic loading applied. Accordingly, a wetland fed with the effluent of a HUSB line were up to 14 times higher than those of the wetland fed with primary settled wastewater. Moreover, systems subjected to three times higher organic loading than that recommended lead to higher metheane emission rates, although high data variability resulted in no statistically significant differences.

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“…This indicates that, next to sedimentation, other removal pathways can take 561 place. Organic components can be degraded both aerobic as well as anaerobic by bacteria 562 attached to the roots, rhizomes and substrates (Baptista, 2003). A biofilm layer present on the 563 roots hanging in the water column could be visually observed in the CFWs Table 4.…”

mentioning

confidence: 99%

Effects of Vegetation, Season and Temperature on the Removal of Pollutants in Experimental Floating Treatment Wetlands

Moortel

Meers

Pauw

et al. 2010

Water Air Soil Pollut

143

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13The research and interest towards the use of constructed floating wetlands for (waste)water 14 treatment is emerging as more treatment opportunities are marked out and the technique is nitrogen, P and COD were respectively 35%, 42%, 22% and 53% for the CFWs, and 3%, 24 15%, 6% and 33% for the control. The pH was significantly lower in the CFWs (7.08 ± 0.21) 25 than in the control (7.48 ± 0.26) after 11 days. The removal efficiencies of NH 4 -N, total 26 nitrogen and COD were significantly higher in the CFWs as the presence of the floating 27 macrophyte mat influenced positively their removal. Total nitrogen, NH 4 -N and P-removal 28 was significantly influenced by temperature with the highest removal between 5 and 15°C. At 29 lower and higher temperatures, removal relapsed. In general, temperature seemed to be the 30 steering factor rather than season. The presence of the floating macrophyte mat restrained the 31 increase of the water temperature when air temperature was >15°C. Although the mat 32 hampered oxygen diffusion from the air towards the water column, the redox potential 33 measured in the rootmat was higher than the value obtained in the control at the same depth, 34indicating that the release of oxygen from the roots could stimulate oxygen consuming 35 reactions within the root mat and root oxygen release was higher than oxygen diffusion from 36 the air. 37

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Microbial mechanisms of carbon removal in subsurface flow wetlands

Cited by 61 publications

References 16 publications

उपचार आर्द्रभूमियााँ

उपचार आर्द्रभूमियााँ

Effect of primary treatment and organic loading on methane emissions from horizontal subsurface flow constructed wetlands treating urban wastewater

Effects of Vegetation, Season and Temperature on the Removal of Pollutants in Experimental Floating Treatment Wetlands

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