Clogging of vertical-flow constructed wetlands treating urban wastewater contaminated with a diesel spill

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• 作者：Rawaa Al-Isawi ; Miklas Scholz ; Yu Wang…
• 关键词：Aggregate size ; Chemical oxygen demand ; Contact time ; Hydrocarbon ; Phosphorus ; Resting time ; Suspended solids ; Wang ; Scholz model
• 刊名：Environmental Science and Pollution Research
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：22
• 期：17
• 页码：12779-12803
• 全文大小：1,250 KB
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• 作者单位：Rawaa Al-Isawi (1)
  Miklas Scholz (1)
  Yu Wang (1)
  Abdulkadir Sani (1)
  
  1. Civil Engineering Research Group, School of Computing, Science and Engineering, The University of Salford, Newton Building, Salford, M5 4WT, England, UK
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

Clogging often leads to a decrease of the treatment performance of wetlands. The aims of this study were to compare the impact of different design and operational variables on the treatment efficiency and clogging processes and to model suspended solid (SS) accumulation within the saturated wetland zone using the Wang-Scholz model. Different vertical-flow constructed wetlands were operated from June 2011 until April 2014. Four treatment periods were assessed: set-up, first year after set-up period, second year after set-up period and diesel spill (for selected filters only). The filter with the highest chemical oxygen demand (COD) loading but no diesel contamination performed the best in terms of COD and biochemical oxygen demand (BOD) removal for the fourth and final treatment period. Filters contaminated by diesel performed worse in terms of COD and BOD but considerably better regarding nitrate-nitrogen removal. Serious clogging phenomena impacting negatively on the treatment performance and the hydraulic conductivity were not observed. Modelling results were generally poor for the set-up period, adequate for the first 2 years after the set-up period and variable after the diesel spill. The Wang-Scholz model performed well for less complex operations. Keywords Aggregate size Chemical oxygen demand Contact time Hydrocarbon Phosphorus Resting time Suspended solids Wang-Scholz model