Wastewater can be treated using a combination of a settleable solids separator, such as a vortex separator and a membrane separation system. Removal and segregation of materials that adversely affect operation of the membrane separator earlier in the treatment process can improve water throughput, water...http://www.google.com/patents/US6395181?utm_source=gb-gplus-sharePatent US6395181 - Process and apparatus for treating wastewater
