Large populations of non-biting midges (Chironomidae) that emerged from waste water stabilization ponds in central Israel created severe nuisance to nearby residents in 1998. A study was begun in summer 1998 to examine the dynamics and phenology of the population as a basis for a successful control strategy. The extensive waste pond area required the development of efficient, reliable and compe...

Phosphorus removal in waste stabilization ponds (WSP) is highly variable, but the reasons for this are not well understood. Luxury uptake of phosphorus by microalgae has been studied in natural systems such as lakes but not under the conditions found in WSP. This work reports on the effects of phosphate concentration, light intensity, and temperature on luxury uptake of phosphorus by WSP microa...

In dryland regions, increased demand for water has led to the reduction of natural aquatic habitats and threatens persisting aquatic habitats. In the Madrean Sky Islands (MSI), water demands have also resulted in the creation of novel aquatic habitats, including stock ponds. Stock ponds are important surrogate habitat for native species, yet little is known about the aquatic invertebrates utili...

Occurrence of helminthic parasites of human origin in sewage is a major public health concern. Dependent upon the size of the community as well as the prevalence of infection within the community, municipal wastewater can contain varying numbers of Ascaris sp. and other helminthic ova. Infectious diseases caused by fecal pathogens are principal cause of human morbidity worldwide, particularly i...

The present study was focused on the characterization of biocenotic diversity saprotrophic fungi, taking into account impact various treatment systems and technological stages as well physicochemical properties wastewater. biodegradation potential, hazard posed to humans, animals, environment, effectiveness elimination propagules were evaluated. most effective fungal recorded in hybrid construc...

Thousands of farm ponds disappeared on the tableland in Taoyuan County, Taiwan since 1920s. The number of farm ponds that have disappeared is 1,895 (37%), 2,667 ponds remain (52%), and only 537 (11%) new ponds were created within a 757 km(2) area in Taoyuan, Taiwan between 1926 and 1960. In this study, a geographic information system (GIS) and logistic stepwise regression model were used to det...

An experiment was conducted to assess the effect of different harvest draining techniques of fish ponds on water quality and fish growth in subsequent culture cycles. Fifteen tilapia ponds of 200 m2 were harvested using five different harvest draining techniques. After harvest, these ponds were stocked with Nile tilapia (Oreochromis niloticus) at 2 fish m-2. Fish with an initial size of 11 to 1...

Three types of ponds used for treating domestic wastewater in Burkina Faso in Soudano-sahelian climate, were monitored for sludge accumulation. After five and a half years of operation, the rates of sludge accumulation in the ponds were evaluated to 0.02; 0.009 and 0.007 m 3 /capita year respectively for the anaerobic, facultative and maturation ponds. The corresponding rates of accumulation in...