A three-stage experimental constructed wetland for treatment of domestic sewage: First 2 years of operation

Vymazal, Jan; Kröpfelová, Lenka

doi:10.1016/j.ecoleng.2010.03.004

Cited by 139 publications

(77 citation statements)

References 14 publications

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“…The BOD was almost entirely removed in the first stage leaving little bioavailable carbon for denitrification in the second stage, having as a consequence a nitrate accumulation [8]. According to several researchers, a source of dissolved organic matter should be provided to improve nitrate removal by recirculation or by adding an external organic source such as methanol to provide the needed electron donors for denitrification [22,23]. However, in the case where the goal of treatment is to provide a nitrified effluent, these results indicate that the two systems containing VF systems are preferred and are equally effective in maintaining bioavailable N which can be used for crop production.…”

Section: Nitratementioning

confidence: 99%

Comparative Study of Three Two-Stage Hybrid Ecological Wastewater Treatment Systems for Producing High Nutrient, Reclaimed Water for Irrigation Reuse in Developing Countries

Zurita

White

2014

Water

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In this study, three different two-stage hybrid ecological wastewater treatment systems (HEWTS) with combinations of horizontal flow (HF) constructed wetlands (CWs), vertical flow (VF) CWs and stabilization ponds (SP) were evaluated for the removal of Organic-N, NH 4 + , NO 3 − , Total N, Total P, Total Coliforms (TCol) and Escherichia Coli, BOD, COD and TSS. The overall goal of the study was novel in comparison to most other studies in that we sought to evaluate and compare the efficiency of the three HEWTSs for water quality improvements, while minimizing nutrient removal from the wastewater in order to generate high quality reclaimed water for reuse for irrigation of crops. The most effective systems were those systems containing a vertical flow component, either HF-VF or VF-HF. In these two HEWTS, NH 4 + was reduced by 85.5% and 85.0% respectively, while NO 3 − was increased to 91.4 ± 17.6 mg/L and to 82.5 ± 17.2 mg/L, respectively, an artifact of nitrification. At the same time, E. coli was reduced by 99.93% and 99.99%, respectively. While the goal of most wastewater treatment is focused on reducing nutrients, the results here demonstrate that two-stage HEWTSs containing VF components can be used to produce a high quality effluent while retaining inorganic nutrients, thereby conserving this valuable resource for reuse as irrigation water for agriculture in subtropical developing countries where water and fertilizer resources are scarce or expensive.

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Section: Nitratementioning

confidence: 99%

Comparative Study of Three Two-Stage Hybrid Ecological Wastewater Treatment Systems for Producing High Nutrient, Reclaimed Water for Irrigation Reuse in Developing Countries

Zurita

White

2014

Water

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“…Moreover, hybrid systems have been in use since the 1980s (Vymazal 2011). Several important studies about the selection of filter media, the treatment performance at low temperature, and the recirculation effect have been conducted in cold climates (Poldvere et al 2009(Poldvere et al , 2010Jenssen et al 2005Jenssen et al , 2010Speer et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…To overcome these issues, we designed and constructed multi-stage hybrid reed bed systems in 2005 with a safety bypass and a floating cover to treat high-content wastewater in the cold climate of Hokkaido, Japan (Kato et al 2006(Kato et al , 2009. Our hybrid systems are basically a combined hybrid system (Obarska-Pempkowiak 2003;Poldvere et al 2009;Vymazal 2011), including a French-type reed bed system (Molle et al 2005) and a Danish system with recirculation in a vertical (V) flow reed bed (Brix and Arias, 2005). Here, we describe the design and performance of the six hybrid systems.…”

Section: Introductionmentioning

confidence: 99%

Performance of six multi-stage hybrid wetland systems for treating high-content wastewater in the cold climate of Hokkaido, Japan

Kato

Inoue

Ietsugu³

et al. 2013

Ecological Engineering

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The performance of six multi-stage hybrid wetland systems, which were designed and constructed for treating high-content wastewater, was evaluated in the cold climate of Hokkaido, northern Japan. The systems were designed to treat four kinds of wastewater: dairy wastewater (three systems, average inflow 4.9-46.6 m 3 .d -1 , average inflow content 2,400-5,000mg.COD.l -1 , 2-5 years of operation); wastewater from a pig farm, including liquid food washing wastewater (one system, 4.1 m Keywords hybrid constructed wetland; cold climate; dairy milking parlor;potato starch processing wastewater; swine urine; oxygen transfer rate 4 IntroductionJapan's food self-sufficiency ratio is only about 40%, which is remarkably low compared to other industrialized countries. A large surplus of nitrogen and phosphorus is given to animals as feed, which is mostly imported from abroad (Yano et al. 1999).Moreover, the nitrogen and phosphorus from animal manure exceed fertilizer needs because of the small area of farmland in Japan. Treatment of dairy milking parlor wastewater, potato starch processing wastewater, and swine urine wastewater has been a big problem in Hokkaido, northern Japan, where such wastewaters are polluting rivers and groundwater. Conventional mechanical wastewater treatments are expensive. Thus, there is an urgent need for a low-cost technology for treating such wastewater.Constructed wetlands for pollution control have progressed greatly over the past 20 years (Cooper 2009;Vymazal 2009; Kadlec et al. 2000). Moreover, hybrid systems have been in use since the 1980s (Vymazal 2011). Several important studies about the selection of filter media, the treatment performance at low temperature, and the recirculation effect have been conducted in cold climates (Poldvere et al. 2009(Poldvere et al. , 2010Jenssen et al. 2005Jenssen et al. , 2010Speer et al. 2012). However, issues of clogging and freezing for treating high-content wastewater in cold climates still remain. To overcome these issues, we designed and constructed multi-stage hybrid reed bed systems in 2005 with a safety bypass and a floating cover to treat high-content wastewater in the cold climate of Hokkaido, Japan (Kato et al. 2006(Kato et al. , 2009 Mean temperature, rainfall, assessment period, and assessment number are shown in ** All systems operated throughout the year except the system for the potato starch factory P, which was designed to work from May to November. *** P1 was preserved wastewater from May to August and P2 was fresh wastewater from September to November. Schematic diagramA schematic diagram of the hybrid wetland system is shown in Fig. 1. Our systems are composed of three to four V flow beds with a self-priming siphon and no or one horizontal (H) flow bed with a total of three to five beds. A French-type self-priming siphon was applied for the V flow bed with minor modifications; each dosing pipe was single for simplicity and easy maintenance (Kato et al. 2006(Kato et al. , 2009. Some effluents were recirculated (Vr) to the inlet...

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“…1 The presence of wetland plants is one of the most noticeable features of constructed wetlands in contrast to soil-only filters. 2 Wetland plants can enhance metal removal and/or stabilization. 3 Typha Latifolia which is an aquatic Macrophytes has been the requisite features to be used in phytoremediation due to its fast growth, spreading easier and simple way to harvesting.…”

Section: Introductionmentioning

confidence: 99%

Sustainability of Constructed Wetlands in Using Biochar for Treating Wastewater

2017

RJC

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Constructed wetland (CW) is a reliable, cost effective and sustainable technology for the treatment of different sorts of wastewater via different treatment processes including biological, chemical and physical processes. Coconut Shell (CS) as Biochar was obtained through decomposition of organic material without oxygen. It offers simple, cost effective strategies to treat wastewater and decrease carbon footprint. Consolidation of both (Constructed wetland and Biochar) technologies was adopted to increase the productivity in the treatment of domestic wastewater. Reduction of parameters like nitrogen, pH, turbidity other physicochemical parameters from wastewater using biochar from coconut shell was investigated by mixing the biochar with the wetland soil. Further, in this study analyzed the effect of biochar on the growth of the plants in the wetland(Typha latifolia). The biochar amended wetlands showed greater removal efficiencies of 99.9% and 85% in turbidity and TDS, respectively as compared to the normal wetlands which exhibited an efficiency of 98% and 77.7% in removing turbidity and TDS, respectively.

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A three-stage experimental constructed wetland for treatment of domestic sewage: First 2 years of operation

Cited by 139 publications

References 14 publications

Comparative Study of Three Two-Stage Hybrid Ecological Wastewater Treatment Systems for Producing High Nutrient, Reclaimed Water for Irrigation Reuse in Developing Countries

Comparative Study of Three Two-Stage Hybrid Ecological Wastewater Treatment Systems for Producing High Nutrient, Reclaimed Water for Irrigation Reuse in Developing Countries

Performance of six multi-stage hybrid wetland systems for treating high-content wastewater in the cold climate of Hokkaido, Japan

Sustainability of Constructed Wetlands in Using Biochar for Treating Wastewater

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