[Reclaimed water quality control for landscape with GFH + BF treatment system]

In order to control reclaimed water quality for landscape, GFH + BF treatment system was studied. In the experiment, GFH effluent was the inlet water of artificial lake, and BF was used as core process for contaminants removal and lake water supplying. The results showed that GFH could reduce TP, DOM and N very effectively, the removal rates of TP, NH4+ -N, NO2- -N, DOC, UV254 and color were 89.8%, 23.3%, 58.7%, 17.6%, 26.1% and 41.2%, respectively. After GFH effluent flowing into artificial lake, the concentrations of TP and NH4+ -N increased slightly. NO2- -N and NO3- -N were nitrogen source for the growth of cyanobacteria and the removal rates were 68.3% and 84.9% , respectively. Bank filtration removed 33.0% TP, 39.5% NH4+ -N, 42.2% NO3- -N, 26.0% TN, 24.5% DOC, 12.1% UV254 and 33.0% color for landscape water. In conclusion, "GFH + BF" treatment system reduced contaminants greatly from reclaimed water and landscape water, and lake water cycle was achieved, which could avoid eutrophication of landscape effectively.