Suchergebnisse

- Textile wastewater treatment: possible approaches with an emphasis on constructed wetlands -- Constructed Wetland for Metals: Removal Mechanisms and Analytical Challenges -- Role of Aerated constructed wetlands for municipal wastewater treatment -- Constructed Wetlands for remediating Organic Hydrocarbons: An approach for the sustainable environmental cleanup -- Constructed wetlands as an effective tool for textile effluent treatment -- Constructed wetland-microbial fuel cell for wastewater treatment and energy recovery: An Emerging Technology -- Aerated Constructed Wetlands for Treatment of Food Industry Wastewater -- Use of Algae in wastewater treatment -- Constructed Wetlands: The traditional system -- The need for auto-tailored wetlands for the treatment of untampered wastes of wineries and breweries -- Horizontal Subsurface Flow Constructed Wetlands for toxic pollutants removal -- Microbial consortium for the treatment of brewery effluents -Recommendation for brewery effluent treatment in constructed wetlands -- In silico integration in Environmental Remediation. .

Results of a bench-scale model investigation of the dispersion impact on Subsurface Flow ConstructedWetland(SFCW) designs are presentedin this arti cle. The research involved determining the dispersion number as interstitial velocity, a function of aspect ratio and flow rate, was varied. The range of dispersion numbers foundwas from 0.107 to 0.345. Results indicatedthat as the aspect ratio is decreased below 2:1, increased dispersion occurs. Additionally, an increase in dispersion number with increasing flow rate for larger aspect ratios (6:1, 3:1, 2:1) was revealed. Interstitial velocity was shown to control dispersion number for higher flow rates; however, aspect ratio controlledthe dispersion number when the ratio was reduced below 2:1. This research provides a valuable tool intended for estimating the dispersion impact when applying alternative models to the design of SFCWs.

Natural and constructed wetlands play a very important role within the landscape and their ecological services are highly valuable. Water management, including flood water retention, biomass production, carbon sequestration, wastewater treatment and as a biodiversity source are among the most important ecological services of wetlands. In order to provide these services, wetlands need to be properly evaluated, protected and maintained. This book provides results of the latest research in wetland science around the world. Chapters deal with such topics as the use of constructed wetlands for trea

Cover; Title Page; Copyright Page; Dedication; Table of Contents; Acknowledgement; Summary; Samenvatting; Ch. 1: General Introduction; 1.1. Background of the study; 1.2 The Kaduna Refining and Petrochemical Company (KRPC), Kaduna; 1.3 Problem statement; 1.4. Research objectives of the thesis; 1.4.1. General objectives; 1.4.2. Specific objectives; 1.5. Research questions; 1.6. Significance of the study; 1.7. Outline of the thesis; 1.8. References; Ch. 2: Constructed wetlands to treat wastewater generated in conventional petroleum refining industry: a review; Abbreviations and notations.

AbstractChromium can have detrimental effects on most organisms, including humans. The present study focused on the effect of treating chromium‐bearing, organic‐rich wastewater on constructed wetland performance. Eight laboratory‐scale systems were used to study organic matter and chromium removals, with three features tested in duplicate: media with proven chromium sorption capacity, vegetation presence and intermittent influent loading. A set of two wetlands acted as the base design. Average BOD5 and chromium removal rates were 13.4 g/m2 day and 135 mg Cr/m2 day, respectively. From an influent chromium concentration of 5 mg/L, <0.5 mg/L could be detected at the outlet during the study in all systems. Chromium removal efficiencies were statistically different for all systems (P<0.01), except when comparing the base design against the intermittent feed systems (P>0.05). Overall treatment performance of all systems was remarkably good in spite of significant chromium content and salinity.

Introduction: Currently, wastewater treatment plants (WWTPs) do not efficiently remove pharmaceutical substances (PS). Thus, such substances are now frequently found in aquatic ecosystems worldwide. Also, concentrations of some PS in treated effluents exceed Environmental Quality Standards proposed by EU legislation. One resource-efficient option for increasing PS removal in WWTP effluents is to use constructed wetlands (CWs) as an attenuation step (Breitholtz et al. 2012; Li et al. 2014). However, very little research has been done on how to maximize the PS attenuation capacity of CWs. Therefore, a project with the aim to investigate reduction of different pharmaceutical substances in CWs with different vegetation compositions and water depths, was performed at the Experimental Wetland Area (EVA) located 20 km north of Halmstad, Sweden. ; This work was financially supported by the Crafoord Foundation [grant number 20140950], The Royal Swedish Academy of Agriculture and Forestry [grant number H14-0049-CFH and H14-0049-AKF] and Magnus Bergvalls Foundation [grant number 2015-00818].