| 摘要 |
A fluid treatment system includes a tank divided into a horizontal series of filtering sub-chambers by perforated plates. A series of graded filtration media, beginning with a coarse medium and progressing to a fine medium such as sand is disposed in consecutive sub-chambers. Various features are provided with this system to perform desirable system operations. For example, the system is provided with input and outlet pressure sensors, and means for detecting the pressure differential between those two sensors, to indicate the desirability of backwashing the filtration media contained within one or more sub-chambers. The system is further provided with plural pumps and valves to permit backwashing of the fine filtration medium in a direction reverse to the direction of filter flow, and transverse to that direction.
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