The Actiflo® Process: A Highly Compact and Efficient Process to Prevent Water Pollution by Stormwater Flows

Abstract

Prevention of pollution due to stormwater flow is the new challenge in water pollution control. With a view to avoid heavy investments in buffering capacity, a new process called Actiflo® has been developed. This process allows an upflow velocity of 130 m/h over the lamella, which means a total area of only 0.03 m2 per m3/h of influent capacity. Under these conditions, a reduction of 80% of the TSS is achieved using about 60g/m3 of ferric chloride and 0.8 g/m3 of polyelectrolyte. High compactness and quick start up of the process allows one to set up the Actiflo® in any place where prevention of stormwater flow is suitable, with low operating and investment costs compared to conventional solutions.

Selecting a single powdered activated carbon against multiple threats: taste & odour and benzene

“…Typical contact times of PAC in such a system are 10 to 15 minutes. 24 The reaction was stopped by filtering the suspension immediately through a 0.45 U& PES filter (Supor®, Pall Corporation). Controls containing the spiked water matrix without PAC were added to each experimental series.…”

Treatment of Micro-Polluted Water with Diatomite-Enhanced Coagulation

“…Since the turbidity of raw water is lower, conventional coagulation is more difficult. The nucleation formed by diatomite can enhance the density and settlement speed of the flocs [5,6], while diatomite can adsorb some organic matter. When the diatomite dosage exceeded 20 mg/L, the removal rates of color, UV 254 , COD Mn were relative stable, but that of turbidity decreased.…”

The capture and release of biomass using a high voidage fibrous filter (marked revision)

“…Although the technology is simple and inexpensive in operation, it may give higher than acceptable effluent solids concentration, particularly during seasonal peak flows or storm weather flows. Many improvements have been made to basic settling technology in order to enhance the separation and increase the settling velocity, including the use of slanted baffles, flocculants, coagulants and sand weighting (Guibelin et al, 1994;Plum et al, 1998;Desjardins et al, 2002;Imasuen et al, 2004). An excellent review of these and other innovations in settling technology are given in Ekama et al (1997).…”