MEDAWARE. Combined Schemes; Pros & Cons, or, “when to use”?. Christos Anastasiou, PhD Department of Civil & Environmental Engineering Faculty of Engineering & Architecture. Outline. “Definition” of a “Combined Scheme” Combination of Treatment Methods Co-treatment of Wastewaters
(Emerging constituents removal occurs in both but not well quantified)
1 = <25% removal of influent concentration2 = 25-50%3 = >50%
GreenhousesNecessity of Combination of Treatment MethodsExample: Animal Waste
The simplest possible method is still desirable!!
Schematic of Septic Tank
Aerated lagoon system, USATypical wastewater treatment options for small and decentralized systems
Each situation is different and needs to be given dual consideration, different alternatives exist for each system from small scale households to large scale centralized one.
Nevertheless, there is a clear trend toward intensive treatment technologies (a trend that is exacerbated by the preference of engineering consultants and contractors).
Instead, more attention should be given, where appropriate, to properly designed lower-cost, simpler to operate processes as well as to decentralized technologies. These should be adopted depending on the influent wastewater and on the desired effluent quality.
Also, whenever feasible, a reuse component should be included for all new wastewater treatment projects