Characterization of Treatment Processes and Mechanisms of COD, Phosphorus and Nitrogen Removal in a Multi-Soil-Layering System (Environment)
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概要
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Characteristics of the treatment processes inside a MSL system were investigated by using a laboratory-scale MSL system, which was set up in a D10×W50×H73cm acrylic box enclosing "soil mixture blocks" alternating with permeable zeolite layers. For the study of the treatment processes inside the system, wastewater, with mean concentrations (mg L^<-1>) of COD: 70, T-N: 12, T-P: 0.9, was introduced into the system at a loading rate of 1,000Lm^<-2> d^<-1>. Treatment processes in the MSL system were different for the COD, P and N pollutants. Eighty percent of COD was removed in the 1st soil layer among the 6 layers, and the removal rate increased as water moved down and finally reached 90% in the last layer of the system. Phosphorus concentration was lower under the soil mixture layers than under the permeable layers, presumably because P was adsorbed mainly by soil and mixed iron particles. The P concentration in water gradually decreased in the lower layers of the system. The concentration of PO_4^<3->-P was generally lower in the aerated MSL system than in the non-aerated one. NH_4^+-N was adsorbed and nitrified in the upper part of the system. The NO_3^--N concentration was lower in water under the soil mixture layers than under the permeable layers, indicating that denitrification mainly occurred in the soil mixture layers.
- 一般社団法人日本土壌肥料学会の論文
著者
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SATO Kuniaki
Faculty of Life and Environmental Science, Shimane University
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Sato K
Faculty Of Life And Environmental Science Shimane University
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Wakatsuki Toshiyuki
Faculty Of Agriculture Kinki University
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SATO Kuniaki
Laboratory of Soil and Ecological Engineering, Faculty of Life and Environmental Science, Shimane Un
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Masunaga Tsugiyuki
Laboratory of Soils and Ecological Engineering, Faculty of Life and Environmental Science, Shimane U
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Sato Kuniaki
Faculty Of Life And Environmental Science Shimane University
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