Research on the water purification for reclaimed water resource supply-type lakes by the method of recirculation filtration

Based on the result of suitable filter screening, A recirculation filtration process with multi-medias was applied to investigate the reactor performance in treating reclaimed water resource supply-type lake water. The results showed that the pollutant removal capabilities for single species packing filter was in the following order: activated carbon>;composite inorganic medium>;volcanic rock>;quartz sand>;gravel. A pilot scale test has been carried out using the recirculating filtration process with volcanic rock, composite inorganic medium and activated carbon media. And the removal efficiencies of CODCr, TP, Chlorophyll a., UV254, UV410 and Turbidity attained 66%, 70%, 90%, 65%, 72% and 83% respectively, while the circle period was 14 days and the filtration rate was 10m/h~13m/h. Moreover, the composition of dissolved organic matter (DOM) was analyzed by the excitation-emission matrix (EEM). The fluorescent components in the lake water DOM were mainly aromatic protein (Peak A and Peak E), humic-like fluorophores (Peak C) and fulvic-like fluorophores (Peak D), in which the aromatic protein fluorophores A and E occurred at 230/344nm and 280/360nm, respectively. The fluorophores intensity of the characteristic fluorescence peaks varied significantly indicating that the concentration of DOM varied with the wastewater treatment process.