Title: Purification of Micro-polluted Water in Aquaculture Pond by Integrated Oxidation Pond and Constructed Wetland System
Abstract: Large amount of eutrophic substances deposited at the bottom of a pond caused the pond aging and deterioration of aquaculture environment,which was harmful to a healthy aquaculture and production.The integrated oxidation pond and constructed wetland system was used to purify micro-polluted water in an aquaculture pond at Centre Lake in Qianwei Village,Chongming Island,Shanghai.In the oxidation pond,fibre packing was implanted evenly while microorganisms took fibre packing as carrier.The biofilm on the fibre packing was cultivated and domesticated by precoating treatment with aerobic activated sludge.The structures reinforced the functions of microorganisms to form the symbiotic relationship between algae and bacteria.Ceramsite with large specific surface area in constructed wetlands was favorable for the attached growth of microorganisms and suspended matter absorption.As a result,the removal rates of COD,TN,TP,SS and chlorophyll-a by the integrated system were 38.3% to 59.4%,20.5% to 60.2%,43.9% to 58.7%,66.7% to 95.2% and 15.7% to 50.7%,respectively.The treatment efficiency showed a seasonal variation,in which the best season was summer.The maximum treatment capacity of the integrated system was 441.5 m3/ d.The storage capacity of the aquaculture pond was 70 000 m3.This means that a cycle of water exchange between the aquaculture pond and the integrated system would take 170 d.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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