Water quality assessment of highly polluted rivers in a semi-arid Mediterranean zone Oued Fez and Sebou River (Morocco)

Spatial and Temporal Variation of Water Quality in the Bertam Catchment, Cameron Highlands, Malaysia

“…The DO values varied from 4.57 mg/L to 9.33 mg/L with an average of 7.18mg/L. The lowest average concentration of DO was observed at station LB1 (5.68 mg/L) and at TB3 (5.59 mg/L), which is indicative of discharge of domestic wastewater from the two main towns, Tanah Rata and Ringlet of Bertam Catchment, into the river stream (Perrin et al, 2014) (Figure 2C). DO values mainly decrease due to decomposition of organic matter and nitrification of ammonia introduced from human and industrial wastes (Bailey and Ahmadi, 2014).…”

Quality of the aquatic environment of high Andean rivers evaluated through environmental indicators: a case of the Cunas River, Peru

“…Thus, the waters produced by the fish activity had an average concentration of BOD 5 of 7,57 mg/L, which is between the maximum permissible limits (MPL) and even for environmental quality standards (EQS) for the water of Sierra Rivers (<10 mg/L) [33]. Wastewater from livestock and urban activities had an average concentration of BOD 5 of 892,33 mg/L and 368,33 mg/L, exceeding the MPL of effluents for surface water (50 mg/L and discharged to water bodies (100 mg/L of Peruvian legislation, , respectively, generating processes that impoverish and increasingly reduce the capacity of aquatic ecosystems to eliminate these wastes [2], which endangers the sustainability of food supply and the biodiversity.…”

“…The increasing deterioration that inland aquatic ecosystems are experiencing as a result of natural and anthropogenic pressures, both on a global and watershed scale [1][2][3], requires a growing need to identify and quantify the various sources of pressure and their impacts on river flow and sediment discharge [4]. In recent decades, biotic indices have been developed to assess the effect of anthropogenic interventions on these ecosystems [5][6], highlighting those that rely on the use of bioindicators as they provide a rapid response and quantifiable against various perturbations of the medium [7].…”

“…However, it becomes highly vulnerable to the effects of climate change because it affects the amount of water [24], given that in the last 40 years glaciers have recorded a surface loss of 42.64% over the 1970 inventory. Also, like many other countries, water pollution is one of the major environmental problems, not only because it limits the availability of water for human consumption, but it reduces the multiple uses of water [2].…”

Continuous Adsorption Modeling and Fixed Bed Column Studies: Adsorption of Tannery Wastewater Pollutants Using Beach Sand

“…Both scientists and health authorities have spent the effort considered in pollution clean-up and prevention [3,5,6]. Many types of treatment systems have been considered to eliminate heavy metal contamination in the environment [7][8][9], including ion exchange, flocculation, coagulation, chemical oxidation, chemical precipitation, ozonation, membrane filtration, electrochemical filtration, and activated carbon adsorption [10][11][12][13][14][15].…”