Author:Meiring, PGJ; Oellermann, RADate:1995A system of oxidation ponds in series with a biological trickling filter is described. It was known that this arrangement was incapable of reducing effectively the levels of algae present in the pond liquid even though nitrification was ...Read more
Author:Loedolff, C.JDate:20 Jan 2011The use of oxidation pounds (or sewage lagoons) by small communities as a system of sewage purification has been provisionally accepted in Southern Africa for many reason, the most important being the low cost when compared with the conventional ...Read more