Estimation of Phosphorus Adsorption Capacity of Alum-amended and Composted Paper Mill Sludge
2007
Lee, I.B. (National Horticultural Research Institute, RDA, Suwon, Republic of Korea), E-mail: [email protected] | Chang, K.W. (Chungnam National University, Daejeon, Republic of Korea) | Park, J.M. (National Horticultural Research Institute, RDA, Suwon, Republic of Korea)
Excess application of paper mill sludge (PMS) in field can limit phosphorus uptake by crops because aluminum presented in the sludge can fix or adsorb available phosphorus which is necessary for crop growth. To investigate phosphorus (P) adsorption characteristics of PMS, we examined P adsorption maximum (X∧m) using Langmuir isotherm and P adsorption energy constant (K∧f) using Freundlich isotherm for PMS without alum, PMS with alum, and composted PMS with alum through a laboratory incubation test. The maximum P adsorption capacities were 800 ㎍ g-¹ in soil, 47 mg g-¹ in PMS without alum and 61 mg g-¹ in PMS with alum. P adsorption capacity with alum treatment for PMS increased by 30%.
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