초록 ▼

A method for increasing the cross-flow microfiltration fluxes of waste waters containing suspended solids and/or emulsified oil through microporous thermoplastic tubes by including therein a calcium compound selected from Ca(OH)2 or CaSO4. The calcium compound is present in the waste waters in an am

A method for increasing the cross-flow microfiltration fluxes of waste waters containing suspended solids and/or emulsified oil through microporous thermoplastic tubes by including therein a calcium compound selected from Ca(OH)2 or CaSO4. The calcium compound is present in the waste waters in an amount ranging from above the solubility limit of the compound to about forty (40) percent by weight of the waste waters. The Ca(OH)2 can be added directly to the waste water. The CaSO4 can be included by reacting H2SO4 and Ca(OH)2 in the waste waters to form CaSO4 in situ. Alternatively, wet CaSO4 can be formed by reacting H2SO4 with Ca(OH)2 outside the water and then added to to the waste waters in the required amount.

대표청구항 ▼

A method for increasing the cross-flow microfiltration fluxes of waste waters containing suspended solids and/or emulsified oil comprising the steps of: (a) adding sulfuric acid to waste waters in an amount sufficient to lower the pH of said waste waters to an acidic value, (b) adding calcium hydrox

A method for increasing the cross-flow microfiltration fluxes of waste waters containing suspended solids and/or emulsified oil comprising the steps of: (a) adding sulfuric acid to waste waters in an amount sufficient to lower the pH of said waste waters to an acidic value, (b) adding calcium hydroxide to said acidified waste waters in an amount sufficient to form calcium sulfate in situ in the waste water in an amount ranging from above the solubility limit of said calcium sulfate to about forty (40) percent by weight of said waste waters and, filtering said waste waters containing said calcium sulfate by cross-flow microfiltration through microporous thermoplastic tubes, wherein said microporous tubes: (i) are made of an extrudable thermoplastic composition selected from the group consisting of nylon and polyethylene; (ii) have walls about one (1) millimeter in thickness; (iii) have a dominant pore size ranging from one (1) to ten (10) microns; and (iv) having a porosity of about 65 percent.