Hokkaido University · Environmental Science
Professor Hideo Maruyama's research lab specializes in environmental and chemical engineering, focusing on sustainable solutions for water purification and waste valorization. Key research directions include the development of bio-based flocculants and adsorbents for removing endocrine-disrupting chemicals and oil pollutants from aqueous systems, as well as the utilization of biowaste materials—such as calcined scallop shells—as heterogeneous catalysts for biodiesel production. The lab also explores innovative separation techniques, including ultrasonic atomization and ion-exchange adsorption, to enhance efficiency in contaminant removal and product recovery.
Figures are computed from collected data and may differ slightly.
Adsorption of bisphenol-A (BPA) and diethyl phthalate (DEP) onto activated carbon has been studied. The experimental adsorption data is reasonably well fitted by a two site Langmuir isotherm model. The estimated two equilibrium adsorption constants were almost the same even though the adsorbates were different. This suggested that the existence of two types of adsorption sites with different equilibrium adsorption constants for strong and weak sites on the present activated carbon surface. The e
The effect of ethylated soy protein-based bioflocculant (EtSP) as a filter aid reagent was investigated. The efficiency of EtSP as a filter aid was evaluated in terms of the specific cake resistance, α, and was compared with chitosan and polyaluminum chloride (PAC). Diatomite and kaolin were used as model particles. Total filtration resistance, R, decreased with increasing flocculant dosage (wt.%, flocculant/particle) and was almost constant in the range of 1 wt.% or more for both particles. The
An ultrasonic atomization technique was applied to remove endocrine disruptor chemicals (EDCs) from an aqueous environment. Bisphenol-A (BPA) and diethyl phthalate (DEP) were used as model EDCs. BPA or DEP could be transferred from the bulk liquid to the collected droplet liquid using this technique. Removal experiments were conducted, and the results showed that the removal efficiency was dependent on the initial concentration of EDCs. This technique was potentially effective to remove EDCs in
Abstract To clarify oil‐in‐water (o/w) emulsion, flotation experiments were conducted by adding methylated milk casein (MeCS), which is a biodegradable flocculant. Emulsion used in this study was prepared by ultrasonic emulsification of heavy oil (bunker‐A) and sodium dodecyl sulfate (SDS) solution. It was found that addition of MeCS enhanced clarification of oil droplets from o/w emulsion solution due to floc formation by adding MeCS. An optimum dosage of MeCS to form effective floc was determi
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