Optimising dissolved air flotation/filtration treatment of algae-laden lagoon effluent using surface charge: a Bolivar treatment plant case study.
Dissolved air flotation (DAF) incorporating filtration (DAFF) is used at the Bolivar wastewater treatment plant (WWTP) to polish lagoon effluent for reuse. Elevated algal populations are frequently experienced and can lead to increased coagulant requirements and process control issues. Streaming current detectors (SCDs) and a charge demand analyser (CDA) were used to monitor the full-scale plant. This was followed by an optimisation study using a pilot plant with a CDA. It was found that the normal operational charge demand range for DAF at Bolivar was between -46 and -40 μeq L(-1). Decreasing the pH of coagulation reduced coagulant consumption and facilitated more sensitive CDA responses to changes in alum dose.
Water Research Centre, University of New South Wales, Sydney, NSW, Australia.
Russell
R
Yap
Michael
M
Holmes
William
W
Peirson
Michael
M
Whittaker
Richard
R
Stuetz
Bruce
B
Jefferson
Rita
R
Henderson
D000534:Alum Compounds / Q000737:chemistry; D005374:Filtration / Q000379:methods*; D014865:Waste Disposal, Fluid / Q000379:methods*
D000534:Alum Compounds