Performance Evaluation of Horizontal Subsurface …
The study revealed successful performance of the wetlands in terms of compliance with local discharge standards with respect to chemical-oxygen demand …Web
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The study revealed successful performance of the wetlands in terms of compliance with local discharge standards with respect to chemical-oxygen demand …Web
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3.1 General Layout. A general vertical section of a VF downflow CW cell is presented in Fig. 2.The CW cell comprises the following: (1) a basin (cell) made of either reinforced concrete or, most often, earth covered by High-density polyethylene (HDPE) membrane (for water-proofing); (2) three or four layers of substrate material of various …Web
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Purification Performance of Horizontal Subsurface Flow Constructed Wetland Xinyi Chen 1, Fei Zhong 2,*, Yue Chen 3, Juan Wu 1,4 and Shuiping Cheng 1,4,* 1 Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai …Web
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The present study aimed to investigate the application of a multilayer quartz sand substrate horizontal subsurface flow constructed wetland (HSFCW) for campus sewage treatment. It aimed to assess the pollutant removal efficiency and anti-clogging performance under the suggested maximum organic loading rate (250 g/m 2 /d). The …Web
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Highlights • A model is established for horizontal subsurface flow constructed wetland (HSCW). • A fully connected neural network (FCNN) was used for …Web
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This study investigated the potential of horizontal subsurface flow constructed wetlands (HSSF-CWs) and open raceway ponds (RWPs) operated under different regimes (plants, impregnated activated charcoal (IAC), and algae) for long-term nitrogen removal to control eutrophication problems. For experimental purposes, five …Web
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To find the effect of Hydraulic Retention Time (HRT) and seasons on the performance of horizontal subsurface flow constructed wetland (HSSF CW) in treating rural wastewater, a pilot scale unit 2.5 m × 0.4 m × 0.3 m size bed planted with Typha latifolia and Phragmites australis was operated for a 12-month duration. During the study …Web
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The substrate usually could influence contaminants removal performance by affecting both physicochemical and microbial processes. MO-CW has the highest COD removal rate probably because that the carbon source in sewage is ... with free water surface CWs emitting higher levels of methane and vertical subsurface flow CWs …Web
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We assessed constructed wetland (CW) performance in the removal of six emerging pollutants (EPs) from university campus wastewater. ... Six pilot-scale CWs, i.e., three horizontal subsurface flow ...Web
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The degradation performance of organic matters and microorganism abundance variations of two horizontal subsurface flow constructed wetlands (HSSFCWs) with different influent COD/N ratios and a spray aeration system were investigated. Oxygen-enriched influent water was beneficial to enhance the abilities of nitrification and …Web
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In turn, subsurface flow wetlands are divided into horizontal flow and vertical flow, depending on the hydraulic regime (Kadlec and Wallace, 2009, Fonder and Headley, 2013). The wetland design influences the dominating environmental conditions inside the wetland, which in turn influences degradation processes (Imfeld et al., 2009).Web
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Phosphorus uptake by common and ornamental plants was studied in pilot-scale horizontal subsurface flow (HSSF) constructed wetlands (CWs) with monocultures and polycultures.Three HSSF CWs were planted with monocultures of Phragmites australis (HSSF-Phr), oplectus californicus (HSSF-Sch) and Cyperus papyrus (HSSF …Web
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Concentration-based average removal efficiencies for HSSF-CW and VFCW were BOD, 77% and 83%; COD, 60% and 65%; NH 4+ –N, 67% and 84.47%; NO 3 –N, …Web
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A pilot-scale multistage constructed wetland-pond (MCWP) system with a "pre-ecological oxidation pond, two-stage horizontal subsurface flow constructed wetland (HSCW) and surface flow constructed wetland (SFCW) as the core and postsubmerged plant pond" as the process was used to treat actual polluted river water in the field, and …Web
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The vertical subsurface flow (VSSF) wetland receives periodic doses of pretreated water over its entire top surface but beneath a layer of mulch or gravel so that no water is ever exposed to human contact. ... Austria, France and Denmark all have ordinances defining the size, construction materials and performance standards for subsurface flow ...Web
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Here we report a case study evaluating the performance of two near-identical Horizontal Sub-Surface Flow Constructed Wetlands (HSSF-CW) deployed at a school …Web
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With the increasing number of constructed wetlands being built, the modelling of wetland function and performance is valuable. This work examines the efficacy of applying a numeric model (SubWet 2.0) originally designed for horizontal subsurface flow wetlands to model wastewater treatment within vertical subsurface flow constructed …Web
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Present study investigated the potential of different setups of horizontal subsurface flow constructed wetland (HSSFCW) for sewage treatment in the Indian context. ... Thalla AK, Devatha CP, Anaghs K, Sony E (2019) Performance evaluation of horizontal and vertical flow constructed wetlands as tertiary treatment option for secondary …Web
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The horizontal subsurface flow system (HSF-CW) was designed and built as part of a hybrid constructed wetland plant (HSF-CW combined with a maturation pond) for tertiary treatment of municipal wastewater prior to reuse ... The comparison of the performance of vegetated subsurface flow wetlands and unplanted ones is not …Web
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Compared with the different pollutants, the removal efficiency of subsurface flow wetlands on TN (49%) is bigger than TP (34%), but less than COD (60%). Furthermore, the higher water temperature, smaller flow velocity and bigger water depth will improve the pollutants removal performance of subsurface flow wetlands.Web
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Highlights Modeling of BOD removal in horizontal subsurface flow constructed wetlands. Use of MODFLOW-MT3DMS set of codes – validation with experimental data. Evaluation of first-order decay coefficient λ. Dependence of decay coefficient λ on temperature and HRT. Scenarios for various temperature, HRT, …Web
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The present study aimed to investigate the application of a multilayer quartz sand substrate horizontal subsurface flow constructed wetland (HSFCW) for campus sewage treatment. It aimed to assess the pollutant removal efficiency and anti-clogging performance under the suggested maximum organic loading rate (250 g/m 2 /d). The …Web
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Some studies have evaluated the performance of subsurface gravel wetlands for treating polluted river flows (Wu et al., 2011) or runoff from plant nurseries (Huett et al., 2005); however, these applications have different pollutant concentrations, runoff timing, and influent volumes than subsurface gravel wetlands that treat …Web
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To enhance eutrophic water improvement effect, three parallel lab-scale oxidation pond-vertical subsurface flow constructed wetland-stable pond combined systems with different microporous intermittent aeration positions were constructed. The purification effect of each system was determined, and the contribution rate of each part …Web
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This study aimed to design novel configurations of tidal-flow vertical subsurface flow constructed wetlands (VFCWs) for treating urban stormwater. ... Performance of a vertical subsurface flow constructed wetland under different operational conditions. J. Adv. Res., 7 (5) (2016), pp. 803-814, 10.1016/j.jare.2015.12.002.Web
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These indicate feasibility of application of CWs in cold climate (Fig. 1). Indeed, the performance is questionable even in CW peers' opinion. Based on background knowledge of cold climate zone, it should be noted that free water surface CWs are significantly less effective than the subsurface flow CWs (SSF CWs) (Wittgren and …Web
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Effect of oxygen supply strategy on nitrogen removal of biochar-based vertical subsurface flow constructed wetland: intermittent aeration and tidal flow. Chemosphere (2019) ... Performance assessment of horizontal and vertical surface flow constructed wetland system in wastewater treatment using multivariate principal component analysis. …Web
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For example, HSSFCWs are designed to purify wastewater through anaerobic pathways (Engida et al., 2020), while anaerobic microzones have been identified in surface flow CWs (SFCWs) due to water flow layering over substrate, and vertical subsurface flow CWs (VSSFCWs) due to long-term operation causing microbial oxygen (O 2) …Web
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Ecohydrology is an international environmental science journal at the interface between ecology and hydrology publishing research related to environmental managementWeb
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