US EPA

6894317 

Journal Article 

IMPROVED CROSS-FLOW FILTRATION PROCESS FOR REMOVAL OF TOTAL ORGANIC CARBON AND PHOSPHATES FROM AQUEOUS SEWAGE EFFLUENTS 

Kraus, K; Mahlman, H 

1971 

English 

A CROSS-FLOW FILTRATION PROCESS IS DESCRIBED FOR THE REMOVAL OF TOTAL ORGANIC AND PHOSPHATE CONTENT OF AQUEOUS SEWAGE EFFLUENTS. AN ADDITIVE SELECTED FROM POWERED CARBON, A SALT OF HYDROUS METAL OXIDE, OR THE HYDROUS OXIDE IS INCLUDED IN AN AQUEOUS FEED SEWAGE IN SMALL BUT EFFECTIVE AMOUNTS. THE MIXTURE IS PUMPED THROUGH A FILTER UNIT OF THE INTERNAL OR EXTERNAL FLOW-THROUGH TYPE AT A PRESSURE AND VELOCITY SUFFICIENT TO EFFECT CROSS-FLOW FILTRATION. TYPICAL PRESURES USED EXPERIMENTALLY WERE IN THE RANGE 3 TO 100 PSI AND CROSS-FLOW VELOCITY IN THE RANGE 2 TO 30 FT/SEC. SEVERAL MODES OF CROSS-FLOW FILTRATION ARE SET FORTH. THE FILTERING MEDIUM COMPRISES A POROUS SUBSTRATE MATERIAL HAVING PORES OF FROM 5 TO AS MUCH AS 200 MICRONS IN SIZE AIDED BY AN INERT FILTER AID MATERIAL DEPOSITED ON THE FEED SIDE OF THE SUBSTRATE MATERIAL. THE SUBSTRATE MATERIAL MAY COMPRISE FLEXIBLE, PRESSURE-RESISTANT FIRE HOSE JACKET FOR EXAMPLE, MADE FROM POLYESTER WARP WITH NYLON FILLER; STAINLESS STEEL OR OTHER METAL SCREENING; NYLON, POLYESTER OR OTHER SYNTHETIC SCREENS; AND POROUS CERAMIC OR CARBON. THE FILTER AID MAY BE SELECTED FROM SUCH MATERIAL AS DIATOMACEOUS EARTH, PERLITE, ASBESTOS FIBER, CELLULOSE FIBER, SILICA GEL, AND CARBON FIBER OR POWDER. SIX EXAMPLES AND TEST RESULTS ARE GIVEN. (SINHA-OEIS) 

Water Resources Abstracts; PATENTS; WASTE WATER TREATMENT; FILTRATION; SEWAGE TREATMENT; ORGANIC COMPOUNDS; PHOSPHATES; WATER POLLUTION CONTROL; POLLUTION ABATEMENT; SW 3040:Wastewater treatment processes