[Simulation research on removal efficiency of P-pollutants by several substrates in stormwater].
9 kinds of substrate materials (gravel, aluminite stone, sands, soil, zeolite, ceramic granule, limestone, steel slag and vermiculite) were selected to examine the phosphorus adsorption and removal capacities from runoff by adsorption, captive test and dynamic adsorption experiments. The results showed that these substrate materials had higher removal efficiency for PO4(3-) than those of other phosphorus forms. The adsorption characteristics of the substrates could be described by both Freundlich and Langmuir adsorption isotherms. The equilibrium adsorption capacity of these substrates was in the following order: zeolite, soil and vermiculite > ceramic granule, steel slag and limestone > gravel, sands and aluminite stone. The dynamic adsorption capacity was zeolite, soil, limeramic granule, limestone > steel slag, gravel and sands > ceramic granule and vermiculite. In the meanwhile, the releasing phenomena of phosphorus also could be observed in the captive and dynamic test, particularly for vermiculite, ceramic granule and steel slag. In the dynamic adsorption experiment, the removal efficiency of P-pollutants was ranged from 30% to 87% for the substrate materials except vermiculite, ceramic granule and steel slag. The results suggest that zeolite, limestone and soil are appropriate substrates for removing P-pollutants from stormwater.
Shan
Bao-qing
BQ
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. bqshan@rcees.ac.cn
Chen
Qing-feng
QF
Yin
Cheng-qing
CQ
Hu
Cheng-xiao
CX
D000327:Adsorption; D002119:Calcium Carbonate / Q000737:chemistry; D010710:Phosphates / Q000737:chemistry / Q000302:isolation & purification; D010758:Phosphorus / Q000737:chemistry* / Q000302:isolation & purification; D012987:Soil; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods; D017641:Zeolites / Q000737:chemistry*
D010710:Phosphates; D012987:Soil; D014874:Water Pollutants, Chemical; D017641:Zeolites; D010758:Phosphorus; D002119:Calcium Carbonate