CWM1: a general model to describe biokinetic processes in subsurface flow constructed wetlands

Langergraber, Günter; Rousseau, Diederik; García, Joan; Mena, Javier

doi:10.2166/wst.2009.131

Cited by 119 publications

(93 citation statements)

References 13 publications

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“…CW2D (Langergraber and Simunek, 2005) and/or CWM1 (Langergraber et al, 2009b), respectively. Table 9.1 lists processes and components described by the biokinetic models CW2D and CWM1 as well as typical application of these models.…”

Section: Process-based Modelsmentioning

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: Process-based Modelsmentioning

confidence: 99%

उपचार आर्द्रभूमियााँ

Dotro¹,

Langergraber²,

Molle³

et al. 2021

View full text Add to dashboard Cite

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“…For a process-based wetland model, a number of sub-models for different wetland processes have to be considered [4]:…”

Section: Of 18mentioning

confidence: 99%

Applying Process-Based Models for Subsurface Flow Treatment Wetlands: Recent Developments and Challenges

Langergraber

2016

Water

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Abstract:To date, only few process-based models for subsurface flow treatment wetlands have been developed. For modelling a treatment wetland, these models have to comprise a number of sub-models to describe water flow, pollutant transport, pollutant transformation and degradation, effects of wetland plants, and transport and deposition of suspended particulate matter. The two most advanced models are the HYDRUS Wetland Module and BIO-PORE. These two models are briefly described. This paper shows typical simulation results for vertical flow wetlands and discusses experiences and challenges using process-based wetland models in relation to the sub-models describing the most important wetland processes. It can be demonstrated that existing simulation tools can be applied for simulating processes in treatment wetlands. Most important for achieving a good match between measured and simulated pollutant concentrations is a good calibration of the water flow and transport models. Only after these calibrations have been made and the effect of the influent fractionation on simulation results has been considered, should changing the parameters of the biokinetic models be taken into account. Modelling the effects of wetland plants is possible and has to be considered when important. Up to now, models describing clogging are the least established models among the sub-models required for a complete wetland model and thus further development and research is required.

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“…Furthermore, SSF TWs can be divided into horizontal flow (HF) and vertical flow (VF) wetlands, whereby in HF wetlands mainly anaerobic and in VF wetlands mainly aerobic processes occur (Kadlec and Wallace, 2009). Two biokinetic model formulations are implemented in the HY-DRUS Wetland Module: CW2D (Langergraber and Šimůnek, 2005) that describes aerobic and anoxic processes and is mostly used for simulating VF wetlands and CWM1 (Langergraber et al, 2009a) that additionally describes anaerobic processes and is also applicable for HF wetlands. Their mathematical formulation is based on the IWA Activated Sludge Models (Henze et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Simulating vertical flow wetlands using filter media with different grain sizes with the HYDRUS Wetland Module

Pucher

Langergraber

2018

Journal of Hydrology and Hydromechanics

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Abstract:In this study, the simulation results of four vertical flow wetland systems using the HYDRUS Wetland Module are presented. The four wetland systems comprise three single-stage pilot scale systems and one full-scale two-stage system. The main difference between these systems is the filter media used, referred to as fine media, i.e., sand with a grain size distribution 0.063-4 mm, or coarse media, i.e., sand with grain size distributions between 1-4 mm, respectively. The water-flow simulation of each system is carried out using the single porosity van Genuchten-Mualem model. A good match between measured and simulated volumetric effluent flow rates could be achieved for all wetland systems. For reactive transport simulations, the CW2D biokinetic model was applied. First, simulations were run using the standard CW2D parameter set. For some systems, adjustments of the parameter set were needed in order to avoid unlimited bacteria growth. To better fit measured COD, NH 4 -N, and NO 3 -N effluent concentrations, adjustments of few parameters of the standard parameter set were required. The results show that for the VF wetlands with fine sand, no adjustments of the CW2D standard parameter set were needed, while for systems with coarser filter media as the main layer, the standard parameter set had to be adjusted to match simulated and measured effluent concentrations.

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CWM1: a general model to describe biokinetic processes in subsurface flow constructed wetlands

Cited by 119 publications

References 13 publications

उपचार आर्द्रभूमियााँ

उपचार आर्द्रभूमियााँ

Applying Process-Based Models for Subsurface Flow Treatment Wetlands: Recent Developments and Challenges

Simulating vertical flow wetlands using filter media with different grain sizes with the HYDRUS Wetland Module

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