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Interception effect of ditch slag and sediments on nitrogen and phosphorus in water. |
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Abstract In order to discuss the adsorption capacity of nitrogen and phosphorus for slag, 70% slag with 30% ditch sediment and ditch sediments, the isothermal adsorption and kinetics experiments were conducted at the comprehensive experimental field of the Sanjiang Mire Wetland Experimental Station(47°35¢N, 133°31¢E), Chinese Academy of Sciences. Meanwhile, the experimental data were fitted by the Langmuir isothermal adsorption equation. The maximum ammonium nitrogen adsorption amounts for slag, 70% slag with 30% ditch sediment, and ditch sediments were 0.49, 1.03and 1.75mg/g, respectively; the maximum phosphate adsorption amounts were 0.99, 2.33and 1.88mg/g, respectively; the adsorption rates of ammonium nitrogen were 0.10, 0.11and 0.54mg/(g·h) during 0~4h; the adsorption rates of phosphate were 0.048, 0.051, 0.096mg/(g·h) during 0~2h. Slag was used as matrix dam fill since ditch sediments were loose and easy to run off. The hydraulic retention time of ditch water in drainage ditches was extended with matrix dams as well as mitigating the flow velocity of ditch water.
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Received: 12 October 2012
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