Method for increasing the cross-flow microfiltration fluxes of waste waters containing suspended solids and/or emulsified oil

摘要

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.