Patent ID: 7455775
Filing Date: 2008-11-25
Classification: C02F,Y02W

Abstract:
1. A water treatment apparatus comprising: an aerobic treatment region that treats water aerobically, a downstream region in which the water aerobically treated in the aerobic treatment region flows, a water quality sensor that is submerged in the downstream region and detects the water quality, and a sensor washing arrangement submerged in the downstream region, wherein the sensor washing arrangement comprises a pumping device comprising a pump intake section and a pump discharge section; wherein the pumping device pumps up water of the downstream region through the pump intake section and discharges the water through the pump discharge section; and wherein the pump discharge section is positioned relative to the water quality sensor such that the water discharged from the pump discharge section is supplied to the water quality sensor at a flow rate higher than water flowing around the water quality sensor, resulting in cleaning of the water quality sensor by preventing deposition onto the water quality sensor or by removing deposits on the water quality sensor.