Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1977-10-07
1980-09-23
Castel, Benoit
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
204149, 210913, 210722, 210724, 210726, 210738, 210748, B01D 2101, C02B 120
Patent
active
042241480
ABSTRACT:
Solid and/or dissolved contaminants are separated from a polar liquid such as water by providing in the contaminated liquid medium a galvanically charged particulate dispersion of defined size, concentration, density and free surface energy, and then flowing such loaded medium through successive treatment zones of an electrically insulated apparatus at a rate defined by dimensionless parameters such as Reynolds Numbers so as to prevent phase separation. Gaseous oxygen adheres to particle surfaces and oxidation is further promoted by bringing medium to pH 2.0 to 2.5 as with sulfur dioxide gas, plus exposure to action of heavy-metal ions such as ferrous/ferric. After air blowing, medium is neutralized and brought to pH 10-11 with continuous aeration of suspended flocculant, then treated with soda ash and optionally additional particulate (recycled sludge), and the contaminant matter then allowed to precipitate with concurrant galvanic grounding of the medium. The dispersed particulate matter may be inert and deliberately added (e.g. shredded cellulose) or it may be produced in situ by fractionation of component debris as in sewage-refuse; in the latter case the particle itself is subsequently oxidized. In either event, dual end products are potable water and sterile sludge. Dissolved salts such as sodium chloride are simultaneously removed from medium as component of sludge; applicable to remove toxic components from cooling water systems, recover traces of precious metals, etc. from slurry or run-off liquid, brackish water, industrial waste, etc.
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Imhoff et al., Sewage Treatment, 2nd Edition, 1956, pp. 13 & 14.
Alexander John A.
Lindman William E.
Castel Benoit
Hruskoci Peter A.
Johnson Howard L.
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