Waste stabilization pond systems are widely used to treat animal wastes under highly variable hydraulic loading regimes. These systems have received limited research attention with regard to their hydrodynamic behaviour and the potential impact of shock hydraulic loading on their performance. In this study a two-stage dairy shed waste stabilisation pond system was topographically surveyed to de...

In an agroindustrial wastewater pond, a naturally occurring unicellular microalga, Chlorella vulgaris, was closely associated with the terrestrial plant-associative N2-fixing bacterium Phyllobacterium myrsinacearum. When the two microorganisms were artificially coimmobilized in alginate beads, they shared the same internal bead cavities, and the production of five microalgal pigments increased,...

The microalgal strain Chlorella sorokiniana isolated from a waste stabilization pond was used for tertiary treatment of municipal wastewater. Three light:dark (L:D) regimes 12:12, 16:8, and 24:0 were treating wastewater in microalga (A), + sludge (A S), (S) reactors. removal nutrients (N P) found to be the highest microalga-based reactor, with more than 80% biochemical oxygen demand (BOD) 1.2–5...

Urban development is rapidly expanding across the globe and is a major driver of environmental change. It is important to understand how bird species responds to urbanization. Therefore I conducted a qualitative study of birds associated with waste sites such as dumpsite and sewage stabilization ponds was carried out on Moshi municipal. The study assessed the diversity between dumpsite and sewa...

The human immunodeficiency virus type 1 (HIV-1) released by infected individuals or present in human and hospital wastes can potentially cause contamination problems. The presence of HIV-1 was investigated in 16 environmental samples, including raw wastewater, sludge, final effluent, soil, and pond water, collected from different locations. A method was developed to extract total nucleic acids ...

Sludge management in waste stabilization ponds (WSPs) is essential for safeguarding the system performance. Sludge accumulation patterns in WSPs are strongly influenced by the pond hydrodynamics. CFD modeling was applied to study the relation between velocity profiles and sludge deposition during 10 years of operation of the Ucubamba WSP in Cuenca (Ecuador). One tracer experiment was performed ...

Constructed wetlands are engineered to duplicate the processes occurring innaturalwetlands. Themain purpose of structure is remove contaminants or pollutants from wastewater. wetland a new, creative, cost-effective, and green technology compared conventional treatment systems. Water hyacinth couldbe cultivated for wastewater utilised aid purification either industrial sewer water. Consequently,...

Natural systems are a cost-effective way to clean wastewater from small communities. This paper aims use an optimization technique minimize the volume of concrete needed construct facultative pond provided within series three ponds. A nonlinear constrained model was written and then solved using one Add-Ins MS office. The add-in used Excel Solver, algorithm generalized reduced gradient (GRG). B...