Patent ID: 8518261
Filing Date: 2013-08-27
Classification: B01D,C02F

Abstract:
1. A water purification method using a water purification apparatus, wherein the water purification apparatus comprises a raw water storage reservoir, a flash mixer, a two-stage coagulation reservoir, an inclined-plate sedimentation reservoir, a pressurized micro-filter, a pore-control fiber filter, a backwash wastewater recovery reservoir, and a flow channel switch unit, the water purification method comprising: a micro-floc creating process of creating, by the flash mixer, micro-flocs through electrical neutralization and adsorption by reacting injected coagulants with pollutants contained in the outflow water from the raw water storage reservoir; a floc growing process of growing, by the two-stage coagulation reservoir, the micro-flocs in the outflow water from the flash mixer to flocs with a filterable and sedimentable size; a sedimentation process of sedimenting, by the inclined-plate sedimentation reservoir, the flocks in the outflow water from the two-stage coagulation reservoir and discharging only upper clean water; a primary filtration process of supplying the outflow water from the inclined-plate sedimentation reservoir to the pressurized micro-filter to discharge membrane-filtration produced water and return circulating water to the front end of the flash mixer, wherein the primary filtration process further comprises supplying backwash wastewater from the pressurized micro-filter to the backwash wastewater recovery reservoir; a secondary filtration process of supplying, at a first time, from the backwash wastewater recovery reservoir through the flow channel switch unit, backwash wastewater to the pore-control fiber filter according to raw water quality factors of the raw water storage reservoir and filtering/returning the same to the flash mixer, and directly returning, at a second time, from the backwash wastewater recovery reservoir through the flow channel switch unit, backwash wastewater to the flash mixer; and a sludge discharging process of discharging the backwash wastewater from the pore-control fiber filter and the discharge sludge from the inclined-plate sedimentation reservoir, wherein the water purification method further comprises monitoring each of the processes in real time, and wherein the secondary filtration process further comprises measuring the raw water quality factors of the raw water storage reservoir in real time and supplying, at the first time, from the backwash wastewater recovery reservoir through the flow channel switch unit, the backwash wastewater to the pore-control fiber filter, if the temperature, the turbidity level, and the alga population number are higher than predetermined values.