On-line nitrification monitoring in activated sludge with a titrimetric sensor

Article Abstract:

Titration of an activated sludge prove effective in determining the ammonium concentration witthe same amount of ammonium concentrations as obtained from other on-line analyzers. Moreover, the method provided important data regarding the nitrification rate of the sludge. It is automated and does not use expensive chemicals, such as EDTA, which are harmful to the environment. One disadvantage about using the titration method is its variable response time, which is influenced by both the ammonium concentration in the sludge and the nitrification rate of the sludge.

Industrial Gas Manufacturing, Measuring & controlling devices, not elsewhere classified, Other Measuring and Controlling Device Manufacturing, Industrial gases, Water Treatment Analyzers, Nitrogen, Ammonium Compounds NEC, Evaluation, Ammonium, Water treatment equipment, Nitrogen (Chemical element), Water pollution testing equipment, Volumetric analysis, Nitrification, Ammonia fertilizers

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Agricultural chemical movement through a field-size watershed in Iowa: subsurface hydrology and distribution of nitrate in groundwater

Article Abstract:

A characterization of the movement of an agricultural fertilizer from the surface to groundwater is undertaken and showed unsaturated zone groundwater system to have a high potential in storing unutilized nitrogen as nitrate. Loess hills were also shown to be the sensitive link in the agricultural landscape, which induces nitrate to leach into the groundwater. Time of sampling and landscape position were shown to affect measurements of concentration.

Pollution, Water, Underground, Groundwater

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Agricultural chemical movement through a field-size watershed in Iowa: surface hydrology and nitrate losses in discharge

Article Abstract:

A study of nonpoint source pollution of agricultural fertilizer in surface water was undertaken in the Iowa Loess Hills, using historical data and high frequency sampling to establish trends. Concentration of nitrate was found to increase from less than 1 mg/L in 1969 to over 20 mg/L in 1991, with 23% of the mean annual application of nitrogen estimated to remain stored or available for leaching or chemical conversion.

Irrigation engineering

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