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Higher nutrients concentrations were observed into the surface microlayer then in the subsurface of estuarine, shallow lake water. The thinner the surface microlayer, which means the closer it is to the water-atmosphere contact zone, the higher are concentrations of organic and inorganic phosphorus, as well as organic and ammonia nitrogen. Mean values of enrichment coefficients were usually positive...
Lowland rivers in industrial countries such as the UK are seriously impacted by phosphorus from a variety of sources. Point sources include numerous sewage-treatment works; diffuse sources include a full range of agricultural activities from fertiliser application to intensive poultry and stock rearing. The scientific consensus is that the concentration of phosphorus is an important measure of eutrophication...
The removal of the nutrients: different forms of nitrogen, phosphorus and carbon, by two constructed wetland systems with reed (Phragmites australis) was investigated between the spring 2000 and the summer 2001. Two systems: reed pond with surface flow and sand reed bed with subsurface flow, have been compared Both the systems show high performance wastewater purification during whole vegetation season...
Waco Lake (Texas, U.S.A.) is a municipal water supply fed by largely agricultural watersheds and is characterized by poor water quality because of elevated nutrient concentrations. Watershed modeling is used to prioritize management options to reduce nutrient loading into the reservoir. A natural (pre-agricultural) system scenario of the dominant watershed resulted in 80% reduction of total phosphorus...
The aim of this study was to identify empirical relationships among 12 water chemistry parameters, microcystins, and coliform bacteria at four beaches in Lake Winnipeg, Canada. While microcystin fluctuations were not synchronized among the different sites, concentrations were marginally correlated with concurrent nitrate levels at individual sites, but lagged more significantly behind soluble inorganic...
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