Laboratory and pilot-scale field experiments for application of iron oxide nanoparticle-loaded chitosan composites to phosphate removal from natural water.
The aim of this study was to apply iron oxide nanoparticle-chitosan (ION-chitosan) composites to phosphate removal from natural water collected from the Seoho Stream in Suwon, Republic of Korea. Laboratory batch experiments showed that phosphate removal by the ION-chitosan composites was not sensitive to pH changes between pH values of 5.0 and 9.0. During six cycles of adsorption-desorption, the composites could be successfully regenerated with 5 mM NaOH solution and reused for phosphate removal. Laboratory fixed-bed column experiments (column height = 10 and 20 cm, inner diameter = 2.5 cm, flow rate = 8.18 and 16.36 mL/min) demonstrated that the composites could be successfully applied for phosphate removal under dynamic flow conditions. A pilot-scale field experiment was performed in a pilot plant, which was mainly composed of chemical reactor/dissolved air flotation and an adsorption tower, built nearby the Seoho Stream. The natural water was pumped from the Seoho Stream into the pilot plant, passed through the chemical reactor/dissolved air flotation process, and then introduced into the adsorption tower (height = 100 cm, inner diameter = 45 cm, flow rate = 7.05 ± 0.18 L/min) for phosphate removal via the composites (composite volume = 80 L, composite weight = 85.74 kg). During monitoring of the adsorption tower (33 days), the influent total phosphorus (T-P) concentration was in the range of 0.020-0.046 mgP/L, whereas the effluent T-P concentration was in the range of 0.010-0.028 mgP/L. The percent removal of T-P in the adsorption tower was 52.3% with a phosphate removal capacity of 0.059 mgP/g.
a Center for Water Resource Cycle Research , Korea Institute of Science and Technology , Seoul , Republic of Korea.
Jae-Hyun
JH
Kim
b Environmental Functional Materials and Water Treatment Laboratory , Seoul National University , Seoul , Republic of Korea.|c Department of Rural Systems Engineering , Seoul National University , Seoul , Republic of Korea.|d Research Institute for Agriculture and Life Sciences , Seoul National University , Seoul , Republic of Korea.
Song-Bae
SB
Kim
a Center for Water Resource Cycle Research , Korea Institute of Science and Technology , Seoul , Republic of Korea.|e Green School , Korea University , Seoul , Republic of Korea.
Sang-Hyup
SH
Lee
a Center for Water Resource Cycle Research , Korea Institute of Science and Technology , Seoul , Republic of Korea.|f Department of Energy and Environmental Engineering , University of Science and Technology (UST) , Daejeon , Republic of Korea.
Jae-Woo
JW
Choi
D000327:Adsorption; D048271:Chitosan; D005290:Ferric Compounds; D006863:Hydrogen-Ion Concentration; D053758:Nanoparticles; D010710:Phosphates; D056910:Republic of Korea; D014867:Water; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification
D005290:Ferric Compounds; D010710:Phosphates; D014874:Water Pollutants, Chemical; D014867:Water; C000499:ferric oxide; D048271:Chitosan
Chitosan; ion oxide nanoparticles; phosphate removal; pilot-scale field experiment; polymer composites