Industrial Waste Waters Re-use: Application of 3FM® High Speed Filtration and High Rate Softening as Pre-Treatment of Wastewaters from the High Water Consuming Pulp&Paper Sector

Abstract

Industrial waste waters re-use through the treatment of their wastewater to produce water qualities according to industrials own specifications can reduce significantly this impact. The European project AquaFit4Use aims at identifying the best new water technologies to reduce environmental impacts by advanced closure of the water cycle and produce water with the required quality ("fit-for-use") for re-use in four industrial sectors (pulp & paper, chemistry, food and textile). New technologies are tested to increase recycling, remove particles, separate salts, minimize waste production in order to propose optimized treatment lines. The new high speed filtration 3FM ® technology and Multiflo TM Softening were tested as pre-treatment of a membrane process in order to fine-tune the quality of the effluent produced by biological treatment with inlet specifications of a nanofiltration process. Case study of an industrial paper mill, which produces paper and board for containerboard and packaging from 100 % recycling fibbers, is reported.

Development of softening and ballasted flocculation as a pretreatment process for seawater desalination through a reverse osmosis membrane

“…Ballasted flocculation has extracted purified water from polluted wastewater in various solid-liquid separation processes [35][36][37][38][39] . Veolia Water Technologies developed a method based on combined softening and ballasted flocculation that reduces the hardness of drinking and industrial water 40 . Although technologies exist for the softening (Ca 2+ and Mg 2+ removal) of hard freshwater, no technology can currently remove Ca 2+ , Mg 2+ , and other inhibitory substances from seawater prior to RO membrane-based seawater desalination.…”

Development of softening and ballasted flocculation as a pretreatment process for seawater desalination through a reverse osmosis membrane

“…At present, ballasted occulation has been used in various solid-liquid separation processes for obtaining puri ed water from polluted wastewater 35,36,37,38,39 . Furthermore, as a method for reducing hardness of drinking water and industrial water, a process combining softening and ballasted occulation has been developed by Veolia Water Technologies 40 . Applying such processes, we propose that the ne precipitates of insoluble hydroxides and carbonates generated from seawater by softening can be settled at high speed via ballasted occulation.…”