Constructed Wetlands for the Treatment of Wastewater
Constructed Wetlands for the Treatment of Wastewater
Otto Stein
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Within a period of one month, both species achieved heights of 2 to 3 m and very dense basal coverage of their entire respective wetland cells. In early October 1997 the plants once again entered a period of relative dormancy. A continuous flow of synthetic wastewater has been delivered by a peristaltic pump system at a rate of 30 ml/min/cell ±5% (t H = 5 days) since April 5, 1996. Sampling of influent and effluent every fifth day (once per t H ) has occurred continuously since June 1996. All s...amples are analyzed for concentrations of nitrate, phosphate and sulfate by ion chromatography. Stem et al Chemical oxygen demand (COD) is measured by colonmetric determination following digestion. Ammonium is measured in all samples colorimetrically, and total Kjeldahl nitrogen TKN is determined whenever a control parameter is varied. From April 5 to August 16, 1996, approximate average influent concentrations were 200, 80, 8, and 8 mg/L for COD, NH 4, P0 4 -P, and S0 4 -S, respectively. From August 17, 1996 through October 19, 1997 all concentrations were halved.
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