Low Technology Systems for Rural High Turbid and Eutrophic Water Treatment in Shanghai: Constructed Wetlands

Low technology systems constructed wetlands are adopted to treat the rural high turbid and eutrophic water in Chongming Island of Shanghai, China. The constructed wetlands are integrated by combined with oxidation pond and constructed wetland. Ecological fibre media reinforced the functions of microorganism to form the mutualism relationship between algae and bacteria in the pond. Ceramic padding particles with specific surface area in constructed wetlands were liable to the microbial biofilm formation and suspended particles absorption. As a result, the removal rate of COD, TN, TP, turbidity and phytoplankton were good. And the average removals were 50.5%, 38.3%, 51.5%, 88.6% and 31.6%, respectively. The removal rate of TDP and NH4⁺-N were bad. And the average removals were just 15.4% and 16.5%.The treatment efficiency was changed from season to season. And the best time was summer.