scholarly journals Growth Characteristics of <i>Fuirena umbellata</i> in a Surface Flow Constructed Wetland and Its Influence in Nutrients and Faecal Bacteria Removal from Domestic Wastewater in Cameroon

2017 ◽  
Vol 08 (02) ◽  
pp. 171-193 ◽  
Author(s):  
Martin Lekeufack ◽  
Théophile Fonkou ◽  
Etienne Pamo Tedonkeng
Keyword(s):  
Constructed Wetland ◽  
Domestic Wastewater ◽  
Surface Flow ◽  
Growth Characteristics ◽  
Faecal Bacteria ◽  
Bacteria Removal

scholarly journals KINETICS OF PHOSPHATE REMOVAL FROM DOMESTIC WASTEWATER BY CONSTRUCTED WETLAND WITH JOYWEED (Alternanthera sp.)

2020 ◽  
Vol 1 (40) ◽  
pp. 163-171
Author(s):  
Nhut Minh Tran ◽  
Tra Thi Thanh Nguyen ◽  
Lam Hoang Nguyen ◽  
Tran Thi Ngoc Tran ◽  
Trang Thuy Diem Ngo
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetland ◽  
Kinetic Equations ◽  
Domestic Wastewater ◽  
Surface Flow ◽  
Second Order ◽  
Phosphate Removal ◽  
Order Kinetic ◽  
Removal Process ◽  
Domestic Wastewater Treatment

This study aims to determine the dynamics of phosphate removal process in domestic wastewater through wastewater treatment mechanism of constructed wetland with Joyweed (Alternanthera sp.). The experiment was conducted in batches with a retention time of 12 days, the treatments were designed to evaluate the effect of depth of the water with and without Alternanthera sp. on the ability to remove phosphate in wastewater. After 12 days of operation, all experiments reduced phosphate concentration in the effluent. The highest phosphate removal efficiency is at day 9 (about 69\%). Two kinetic equations of first-order and second-order are used to determine the trend of PO43- removal process in the system. The second-order kinetic equation is more suitable for treating PO43- in domestic wastewater by surface flow constructed wetland system. The results of this study show the potential of domestic wastewater treatment of Alternanthera sp. in the constructed wetland.

scholarly journals Performance of horizontal flow constructed wetland for secondary treatment of domestic wastewater in a remote tribal area of Central India

2021 ◽  
Vol 31 (1) ◽  
Author(s):  
Reetika Shukla ◽  
Deepak Gupta ◽  
Gurudatta Singh ◽  
Virendra Kumar Mishra
Keyword(s):  
Constructed Wetland ◽  
Typha Latifolia ◽  
Oxygen Demand ◽  
Central India ◽  
Domestic Wastewater ◽  
Quality Parameters ◽  
Surface Flow ◽  
Fecal Coliforms ◽  
Commelina Benghalensis ◽  
Treated Effluent

AbstractThe purification of the primary treated domestic sewage was performed in the present study through the horizontal sub-surface flow constructed wetland (CW) of 10 × 3.5 m dimension. The study was performed using three setups of CW 1 (Unplanted CW), CW 2 (CW planted with macrophyte Typha latifolia), and CW 3 (CW planted with two species of macrophyte T. latifolia and Commelina benghalensis). The purification experiments were performed by converting one type of CW into the other form sequentially, i.e., CW 1 was built first and after the experiments, it was converted into CW 2 and then CW 3. The CW was filled with a layer of coarse and fine gravel of 70 cm depth as filter media in 1:2 ratio. Each set of wetland was operated for 3 months (12 wk) during which the treatment performance of wetlands for basic physicochemical parameters was evaluated. The CW was operated in continuous mode at an average hydraulic loading rate of 250 L h− 1 and the treated effluent was analysed twice every week at four different sampling points having hydraulic retention times (HRT) of 12, 24, 36 and 48 h for important sewage quality parameters All the three setups of CW were able to clean the primary treated sewage significantly. Among the three sets of wetlands used, CW 3 was the best performer removing 79, 77, 79, 79, and 78% of biochemical oxygen demand, chemical oxygen demand, nitrate, ammonia, and phosphate respectively in 48 h HRT. Among the three sets of wetlands, the CW 3 removed the highest percent of total coliforms, fecal coliforms, and E. coli as 64, 61 and 52% respectively.

Simultaneous removal of ibuprofen, organic material, and nutrients from domestic wastewater through a pilot-scale vertical sub-surface flow constructed wetland with aeration system

2021 ◽  
Vol 43 ◽  
pp. 102214
Author(s):  
Osama Abrahiem AL Falahi ◽  
Siti Rozaimah Sheikh Abdullah ◽  
Hassimi Abu Hasan ◽  
Ahmad Razi Othman ◽  
Hind Mufeed Ewadh ◽  
...  
Keyword(s):  
Constructed Wetland ◽  
Organic Material ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Surface Flow ◽  
Simultaneous Removal ◽  
Aeration System

Combining UASB technology and constructed wetland for domestic wastewater reclamation and reuse

2003 ◽  
Vol 3 (4) ◽  
pp. 201-208 ◽  
Author(s):  
M.A. El-Khateeb ◽  
F.A. El-Gohary
Keyword(s):  
Constructed Wetland ◽  
Subsurface Flow ◽  
Typha Latifolia ◽  
Domestic Wastewater ◽  
Surface Flow ◽  
Planting Density ◽  
Uasb Reactor ◽  
Organic Loading Rate ◽  
Anaerobic Sludge ◽  
Wastewater Reclamation

The enhancement of water quality by constructed wetland systems is increasingly being employed throughout the world. For this study two treatment schemes consisting of an Up-flow Anaerobic Sludge Blanket (UASB) reactor followed by either subsurface flow (SSF) or free surface flow (FSF) constructed wetlands have been investigated. The common macrophyte in Egypt Typha latifolia (cattail) was used at a planting density of three rhizomes/m2. To evaluate the role of plants in the treatment process, an unplanted gravel bed identical to the SSF unit was operated as control. During the study period, the wetlands were fed with the UASB effluent at an organic loading rate ranging from 17.3 to 46.8 kg BOD5/ha·d (55.1 to 134.6 kgCOD/ha·d). Effectiveness of the system for the removal of key constituents (COD, BOD, TSS, nutrients and FC) has been investigated. The results showed that, the level of CODtot, and TSS in the final effluent of SSF was lower than that of FWS. Subsurface flow wetland has demonstrated higher overall efficiency than the unplanted control. FC reduction reached 4 log units. Further studies are on-going to optimize the wetland design under local environmental conditions.

Nitrogen dynamics in a constructed wetland system treating landfill leachate

2007 ◽  
Vol 56 (3) ◽  
pp. 151-158 ◽  
Author(s):  
C.B. Kinsley ◽  
A.M. Crolla ◽  
N. Kuyucak ◽  
M. Zimmer ◽  
A. Laflèche
Keyword(s):  
Constructed Wetland ◽  
Plug Flow ◽  
Domestic Wastewater ◽  
Pilot Scale ◽  
Surface Flow ◽  
Treatment System ◽  
Organic Loading Rate ◽  
Sand Filters ◽  
Ammonium Removal ◽  
Hydraulic Loading

A pilot scale treatment system was established in 2002 at the Laflèche Landfill in Eastern Ontario, Canada. The system consists of a series of treatment steps: a stabilisation basin (10,000 m3), a woodland peat trickling filter (5,200 m2), a subsurface flow constructed wetland planted in Phragmites sp. (2,600 m2), a surface flow constructed wetland planted in Typha sp. (3,600 m2) and a polishing pond (3,600 m2). The system operates from May to December with leachate being recycled within the landfill during the winter months. Hydraulic loading was increased three-fold over four operating seasons with nitrogen and organic mass loading increasing six-fold. Excellent removal efficiencies were observed with 93% BOD5, 90% TKN and 97% NH4-N removed under the highest loading conditions. Almost complete denitrification was observed throughout the treatment system with NO3-N concentrations never exceeding 5 mg·L−1. The peat filter reached treatment capacity at a hydraulic loading of 4 cm·d−1 and organic loading rate of 42 kg BOD·ha−1·d−1, which is consistent with design criteria for vertical flow wetland systems and intermittent sand filters. The first order plug flow kinetic model was effective at describing TKN and ammonium removal in the SSF and FWS wetlands when background concentrations were taken into account. Ammonium removal k-values were consistent with the literature at 52.6 and 57.7 yr−1 for the SSF and FWS wetlands, respectively, while TKN k-values at 6.9 and 7.7 yr−1 were almost an order of magnitude lower than literature values, suggesting that leachate TKN could contain refractory organics not found in domestic wastewater.

scholarly journals Treatment of Combined Dairy and Domestic Wastewater with Constructed Wetland System in Sicily (Italy). Pollutant Removal Efficiency and Effect of Vegetation

Water ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1086
Author(s):  
Mario Licata ◽  
Roberto Ruggeri ◽  
Nicolò Iacuzzi ◽  
Giuseppe Virga ◽  
Davide Farruggia ◽  
...  
Keyword(s):  
Plant Growth ◽  
Organic Compounds ◽  
Removal Efficiency ◽  
Constructed Wetland ◽  
Organic Pollutant ◽  
Dairy Farm ◽  
Domestic Wastewater ◽  
Pollutant Removal ◽  
Dairy Wastewater ◽  
Giant Reed

Dairy wastewater (DWW) contains large amounts of mineral and organic compounds, which can accumulate in soil and water causing serious environmental pollution. A constructed wetland (CW) is a sustainable technology for the treatment of DWW in small-medium sized farms. This paper reports a two-year study on the performance of a pilot-scale horizontal subsurface flow system for DWW treatment in Sicily (Italy). The CW system covered a total surface area of 100 m2 and treated approximately 6 m3 per day of wastewater produced by a small dairy farm, subsequent to biological treatment. Removal efficiency (RE) of the system was calculated. The biomass production of two emergent macrophytes was determined and the effect of plant growth on organic pollutant RE was recorded. All DWW parameters showed significant differences between inlet and outlet. For BOD5 and COD, RE values were 76.00% and 62.00%, respectively. RE for total nitrogen (50.70%) was lower than that of organic compounds. RE levels of microbiological parameters were found to be higher than 80.00%. Giant reed produced greater biomass than umbrella sedge. A seasonal variation in RE of organic pollutants was recorded due to plant growth rate Our findings highlight the efficient use of a CW system for DWW treatment in dairy-cattle farms.

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