Saline Shipyard Wastewater Treatment by Constructed Wetland

The feasibility of using constructed wetland to treat saline shipyard wastewater was evaluated in this study. Constructed wetland, acting as an ecological engineering alternative, is capable of reducing NH4+-N、TN、TP and COD from saline shipyard wastewater. The planted unit showed better capability of COD, TN and TP removal than unplanted unit obviously. Treatment performance of planted unit was found to be 77.7-89.1% for COD, 69.2~80.2% for TN and 54.5~85.9% for TP in the stable operation stage. However, the treatment performance of unplanted unit was found to be 55.3-72.4% for COD, 66.0~79.2% for TN and 55.4~85.3% for TP in the stable operation stage.