Patent ID: 8658031
Filing Date: 2014-02-25
Classification: B01D,C02F

Abstract:
1. An apparatus for treating a liquid containing impurities, comprising: a filtering chamber for receiving liquid containing impurities, the filtering chamber including a lower portion containing granular media and configured to permit the granular media to interact with the liquid containing impurities, thereby removing impurities from the liquid to produce filtrate; a filtrate section in fluid communication with the filtering chamber for receiving the filtrate, the filtrate section being in fluid communication with a first outlet for outflow of the filtrate; a gas supplying system for delivering gas to the granular media in the filtering chamber for transport of a portion of the granular media to a granular media washer from the lower portion; a reject section in fluid communication with the granular media washer for receiving a reject mixture comprising liquid and impurities from the granular media washer, the reject section being in fluid communication with a second outlet for outflow of a portion of the reject mixture; and a sensor configured to provide a control unit with a sensor reading that is indicative of an amount of reject mixture in the reject section, the control unit configured to determine whether the portion of the granular media is being transported properly to the granular media washer from the lower portion based on the sensor reading.