The Encyclopedia Americana: A Library of Universal Knowledge, Količina 29Encyclopedia Americana Corporation, 1918 |
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Stran 48
... slow sand filters may be affected by the use of sulphate of lime to coagulate the clay particles in suspension as in the Potomac , or by the use of concrete sedimentation basins with roughing filters of coarse stone , called baffles ...
... slow sand filters may be affected by the use of sulphate of lime to coagulate the clay particles in suspension as in the Potomac , or by the use of concrete sedimentation basins with roughing filters of coarse stone , called baffles ...
Stran 49
... slow sand filtration plants , known as the Upper and Lower Rox- borough , Belmont , Torresdale and Queen Lane plants ... filters , filtered water reservoirs , the Torresdale plant of 240,000,000 gallons daily capacity having 120 covered me- ...
... slow sand filtration plants , known as the Upper and Lower Rox- borough , Belmont , Torresdale and Queen Lane plants ... filters , filtered water reservoirs , the Torresdale plant of 240,000,000 gallons daily capacity having 120 covered me- ...
Stran 61
... slow sand filter plant below Oak- land Lake in Queens County , whose bacterial ef- ficiency is supplemented by liquid chlorine and several slow and several rapid sand filter plants located on various conduits of the minor sources of ...
... slow sand filter plant below Oak- land Lake in Queens County , whose bacterial ef- ficiency is supplemented by liquid chlorine and several slow and several rapid sand filter plants located on various conduits of the minor sources of ...
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