The biotic and abiotic: processes involved in the environmental degradation of freshwater ecosystems are often complex, and their combined effects are not easily measured. Many human activities across the landscape contribute to degradation, including discharge of domestic, agricultural, and industrial effluents; cultural eutrophication; acidification; erosion and sedimentation following human ...

egionnaires’ disease was first recognized in 1976 during an outbreak among attendees at an American Legion convention. The disease is a form of pneumonia caused by bacteria of the genus Legionella. Legionella thrives at warm temperatures (25–42oC [77–108oF]). It lives inside biofilm in aquatic environments, usually as an intracellular parasite of amoebae.1 This lifestyle protects it from disinf...

Aquatic ecosystems are often contaminated by multiple substances. Nitrate, a common aquatic pollutant, strongly influenced the cycling of arsenic (As) under anoxic conditions in urban Upper Mystic Lake (Massachusetts, USA) by oxidizing ferrous iron [Fe(II)] to produce As-sorbing particulate hydrous ferric oxides and causing the more oxidized As(V), which is more particle-reactive than As(III) u...

surface waters, especially natural rivers always act as receiving waters for various kinds oforganic contaminants from municipal and industrial wastewaters, agricultural activities, organic chemicals inuse, non-point source pollutions. due to their toxicity, persistency and wide diffusion, polychlorinatedbiphenyls (pcbs), pesticides, phthalates, polycyclic aromatic hydrocarbons (pah) and their ...

presence of heavy metals in the aquatic systems has become a serious problem. as a result, therehas been a great deal of attention given to new technologies for removal of heavy metal ions from contaminated waters. adsorption is one of the effective methods for removal of toxic heavy metal such as chromium (vi). in the present study, adsorbent is prepared from rice husk, a low cost by product f...

presence of heavy metals in the aquatic systems has become a serious problem. as a result, therehas been a great deal of attention given to new technologies for removal of heavy metal ions from contaminated waters. adsorption is one of the effective methods for removal of toxic heavy metal such as chromium (vi). in the present study, adsorbent is prepared from rice husk, a low cost by product f...

Surfactants are synthetic organic chemicals that are formulated to have cleansing or solubilisation properties with the development of the industrial economy and increase in population density, surfactants have become one of the most widely disseminated xenobiotics to enter the aquatic environment, creating a serious environmental problem. Principal criterion for the ecological behavior of surf...

Sources of mercury contamination in aquatic systems were studied in a comprehensive literature review. The results show that the most important anthropogenic sources of mercury pollution in aquatic systems are: (1) atmospheric deposition, (2) erosion, (3) urban discharges, (4) agricultural materials, (5) mining, and (6) combustion and industrial discharges. Capping and dredging are two possible...

Sources of mercury contamination in aquatic systems were studied in a comprehensive literature review. The results show that the most important anthropogenic sources of mercury pollution in aquatic systems are: (1) atmospheric deposition, (2) erosion, (3) urban discharges, (4) agricultural materials, (5) mining, and (6) combustion and industrial discharges. Capping and dredging are two possible...