Hybrid membrane module, system and process for treatment of industrial wastewater

摘要

A process for reducing the content and volume of organic matter in a wastewater streamcomprises contacting the latter with a nanofiltration device so as to obtaina concentrate, and a permeate as an aqueous stream containing any salts of non-precipitablemetal ions which may be present, then contacting the concentrate with a preferablybackflashable ultrafiltration device, and optionally also with activatedcarbon. This process may be part of a broader one which also removes other componentsfrom the wastewater stream. A module comprising (a) a nanofiltration device;(b) a preferably backflashable ultrafiltration device; (c) conduit(s) adaptedto convey nanofiltration device concentrate to the ultrafiltration device;and optionally (d) a vessel containing activated carbon; as well as a system fortreating a wastewater stream which includes this module, also form part of theinvention.