Method for increasing the cross-flow microfiltration fluxes of waste waters containing suspended solids and/or emulsified oil
US4313830A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 23, 1980 |
| Grant date | Feb 2, 1982 |
| Priority date | — |
| Expiry date | May 23, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D2315/10
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
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).sub.2 or CaSO.sub.4. 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).sub.2 can be added directly to the waste water. The CaSO.sub.4 can be included by reacting H.sub.2 SO.sub.4 and Ca(OH).sub.2 in the waste waters to form CaSO.sub.4 in situ. Alternatively, wet CaSO.sub.4 can be formed by reacting H.sub.2 SO.sub.4 with Ca(OH).sub.2 outside the water and then added to to the waste waters in the required amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.