Water reuse and recycling a case in Xran
Water reuse and recycling – a case in Xi ’an
Schematic of water reuse in Beishigiao region of Xian Effluent Xi an Electrical Power 100*103m3/d Plant( cooling system and boiler water) XI an Coke and Gasification plant Influent I Secondary Tertiary (cooling system) 150*103mad treatment treatment Production plant ( cooling system) Beishiqiao wwtp Others(small companies municipal and so on)
Schematic of Water Reuse in Beishiqiao region of Xi ’an Secondary treatment Tertiary treatment Xi’an Electrical Power Plant(cooling system and boiler water) Xi’an Coke and Gasification Plant (cooling system) Xi’an Chemical Production Plant (cooling system) Others(small companies, municipal and so on) Beishiqiao WWTP Influent 150*103 m3/d Effluent 100*103 m3/d 15*103 m3/d 10*103 m3/d 1 0* 1 03 m3/d 15*103 m3/d
Secondary Treatment Process in Beishiqiao WwTP Coarse Pump Fine Alternative Secondary selector Disinfectio greenI removal oxidation ditch clarifier Effluent Influent judge return Solid disposal Sludge thickening Disposal
Secondary Treatment Process in Beishiqiao WWTP Coarse screening Alternative oxidation ditch selector Grit removal Secondary clarifier Disinfection Sludge thickening Fine screening Sludge dewatering Disposal Influent Sludge return Pump Effluent Solid disposal
Water Quality from Secondary Treatment Item Influent Effluent pH 7.72 7.78 BOD~ (mg/L) 194.28 11.14 CODcr(mg/L) 315.66 20.32 ss(mg/)42414 1045 TP(mg/L) 3.13 1.15 NHa N(mg/L) 17.60 1.11
Water Quality from Secondary Treatment Item Influent Effluent pH 7.72 7.78 BOD 5(mg/L) 194.28 11.14 CODcr (mg/L) 315.66 20.32 SS (mg/L) 424.14 10.45 TP (mg/L) 3.13 1.15 NH 3-N (mg/L) 17.60 1.11
Tertiary treatment process in Beishiqiao WWTP Coagulate Disinfection agent Filtration Disinfection Effluent from Coagulation+Sedimentation. Secondary treatment Coagulator PAC PAM Disinfection agent: CI
Tertiary treatment process in Beishiqiao WWTP Coagulation Sedimentation Filtration Disinfection Effluent from And equalization Secondary treatment Pump Coagulator User Pump Disinfection agent Disinfection agent: CI2 Coagulator: PAC + PAM