Biological contact oxidation and an artificial floating island for black odorous river purification

Abstract

Abstract Due to destruction caused by urbanization and anthropogenic activities, various methods for treating black odorous rivers have been proposed. Herein, a treatment scheme was put forward for a black odorous river in Dongguan City, Guangdong Province. The river was treated using composite artificial floating island and improved biological contact oxidation processes as the core, supplemented by source control, substrate purification, and water ecosystem construction. The transparency, dissolved oxygen, ammonia nitrogen (NH3-N), and total phosphorus (TP) of the water body met the China Surface Water Environmental Quality Standard (GB3838-2002) V. The oxidation–reduction potential was remarkably improved and the black odor phenomenon was eliminated. The composite artificial floating island had the highest TP removal rate of 38.30%, while the improved biological contact oxidation process had the highest NH3-N removal rate of 43.08%. The process is effective in improving the quality of black odorous rivers and has high applicability; thus, the process provides a reference for the treatment of other black odorous water bodies.