Transportation and Transformation of Pollutants in a New Type Constructed Wetland
FU Guo kai,ZHANG Chi,ZHANG Zhi,ZHANG Yuan,GUO Xuan and LIN Jie
DOI:10.11835/j.issn.1674-4764.2010.02.023
Received December 12, 2009,Revised , Accepted , Available online July 01, 2015
Volume ,2010,Pages 122-127
- Abstract
A three stage series operational pilot scale constructed wetland was built for domestic wastewater treatment with inflow of 4.5 m3/d .The mass balance method was adopted to quantify the transportation and transformation of pollutants in constructed wetland during steady state operation.It was shown that the average removal rate of CODcr was 87.14%, in which 68.45% contributed by dissimilation and 18.69% contributed by assimilation.The average removal rate of TN was 60.21% and the contributions of denitrification and microbial assimilation or plant assimilation were 53.64%, 5.39% and 1.18%, respectively.The average removal rate of TP was 59.36% and the contributions of substrates absorption and microbial assimilation or plant assimilation were 43.55%, 12.26% and 3.55%,respectively.In conclusion, microorganisms played a key role in the removal of pollutants and substrates adsorption was the main approach to phosphorus removal.