Water Science & Technology · 2004 · 16 citations · 0 references
EngineeringEnvironmental EngineeringWater Resources ManagementWastewater TreatmentWater Quality EngineeringWater TreatmentEffluent TreatmentNutrient RemovalPhosphorus RemovalResource Recovery From WastewaterWaste TreatmentWastewater BiotreatmentDetention TimeDissolved OxygenPh DependencePond Wastewater TreatmentSeparability Of Suspended SolidsWaste Stabilization PondsWastewater Stabilization PondsWastewater Treatment Nutrient Removal
In this study it was demonstrated that when water hyacinth ponds (WHPs) are used for polishing the effluent from waste stabilization ponds (WSPs), suspended solids (mostly algal particles) are efficiently separated, which also resulted in the reduction of insoluble forms of COD and nutrients. The high pH of the WSPs effluent was easily adjusted to 6-7 as it passed through the WHPs. However, the use of water hyacinth rapidly reduced dissolved oxygen at the first cell to less than three mg/L or very frequently to a level of anaerobic state. Reduction of suspended solids at the WHPs mainly depends on the detention time and pH. An empirical separation model incorporating the detention time and pH dependence was developed.