N. Shirasaki, T. Matsushita, Y. Matsui, T. Urasaki, M. Kimura, K. Ohno
Water Science and Technology: Water Supply 14 429-437 Jan 2014 [Refereed]
The ability of in-line coagulation pretreatment with high-basicity polyaluminum chloride (PACl) coagulants to enhance virus removal by ceramic microfiltration (MF) was examined by comparing virus removal efficiencies from water pretreated with PAC...
Environment International 63 114-120 Jan 2014 [Refereed]
Pesticides released into the environment may pose both ecological and human health risks. Governments set the regulations and guidelines for the allowable levels of active components of pesticides in various exposure sources, including drinking wa...
N. Shirasaki, T. Matsushita, Y. Matsui, A. Oshiba, T. Marubayashi, S. Sato
Water Research 48 375-386 Jan 2014 [Refereed]
We investigated the effects of basicity, sulfate content, and aluminum hydrolyte species on the ability of polyaluminum chloride (PACl) coagulants to remove F-specific RNA bacteriophages from river water at a pH range of 6-8. An increase in PACl b...
Separation and Purification Technology 119 58-65 Oct 2013 [Refereed]
The residual aluminum concentration in treated water after aluminum coagulation and solid-liquid separation is one of the key factors in evaluating the effectiveness of water treatments. Polymeric membrane filters have been widely used to operatio...
Regulatory Toxicology and Pharmacology 67 98-107 Oct 2013 [Refereed]
Drinking water quality standard (DWQS) criteria for chemicals for which there is a threshold for toxicity are derived by allocating a fraction of tolerable daily intake (TDI) to exposure from drinking water. We conducted physiologically based phar...
The removal of microorganisms by drinking water treatment processes has been widely investigated in laboratory-scale experiments using artificially propagated microorganisms. However, this approach cannot be applied to norovirus removal, because t...
Aluminum coagulants are widely used in water treatment plants to remove turbidity and dissolved substances. However, because high aluminum concentrations in treated water are associated with increased turbidity and because aluminum exerts undeniab...
Separation and Purification Technology 107 79-84 Feb 2013 [Refereed]
We investigated the removal of bacteriophages by adsorption on commercially available powdered activated carbon (N-PAC, median diameter >10 μm) and super-powdered activated carbon (S-PAC, median diameter 0.7-2.8 μm). N-PACs failed to remove the vi...
N. Shirasaki, T. Matsushita, Y. Matsui, T. Urasaki, K. Ohno
Water Science and Technology: Water Supply 12 666-673 Oct 2012 [Refereed]
Difference in behaviors of F-specific DNA and RNA bacteriophages during coagulation-rapid sand filtration and coagulation-microfiltration (MF) processes were investigated by using river water spiked with F-specific DNA bacteriophage f1 and RNA bac...
We used the bacteriophages Qβ and MS2 to determine whether viruses are inactivated by aluminum coagulants during the coagulation process. We performed batch coagulation and filtration experiments with virus-containing solutions. After filtering th...
Journal of Water Supply: Research and Technology - AQUA 59 501-511 Dec 2010 [Refereed]
The feasibility of in-line coagulation as a pretreatment for ceramic microfiltration (MF) was verified by comparing its efficiency in the removal of viruses with that of the traditional mechanical mixing approach for coagulation, and by examining ...
N. Shirasaki, T. Matsushita, Y. Matsui, T. Urasaki, A. Oshiba, K. Ohno
Water Science and Technology 61 2027-2034 Jul 2010 [Refereed]
Norovirus (NV) is a prototype strain of a group of human caliciviruses responsible for epidemic outbreaks of acute gastroenteritis worldwide. Because of the lack of a cell culture system or an animal model for this virus, studies on drinking water...
N. Shirasaki, T. Matsushita, Y. Matsui, A. Oshiba, K. Ohno
Water Research 44 1307-1316 Mar 2010 [Refereed]
Norovirus (NV) is an important human pathogen that causes epidemic acute nonbacterial gastroenteritis worldwide. Because of the lack of a cell culture system or an animal model for this virus, studies of drinking water treatment such as separation...
N. Shirasaki, T. Matsushita, Y. Matsui, T. Urasaki, K. Ohno
Water Research 43 605-612 Feb 2009 [Refereed]
Differences in the behaviors of two surrogates for pathogenic waterborne viruses, F-specific RNA bacteriophages Qβ and MS2, were investigated during the coagulation process by using river water spiked with these bacteriophages. The particle size a...
N. Shirasaki, T. Matsushita, Y. Matsui, M. Kobuke, K. Ohno
Journal of Membrane Science 326 564-571 Jan 2009 [Refereed]
The removal performance of two surrogates for pathogenic waterborne viruses, F-specific RNA bacteriophages Qβ and MS2, was evaluated during the coagulation-ceramic microfiltration process. River water spiked with these bacteriophages was used to i...
Journal of Water Supply: Research and Technology - AQUA 57 501-506 Nov 2008 [Refereed]
We evaluated the removal of virus (bacteriophage Qβ) after hydraulic backwashing and the effects of reversible and irreversible membrane fouling on virus removal by a coagulation-microfiltration (MF) system. The rate of virus removal in the coagul...
N. Shirasaki, N. Shirasaki, T. Matsushita, Y. Matsui, K. Ohno, M. Kobuke
Water Science and Technology: Water Supply 7 1-8 Dec 2007 [Refereed]
Virus removal performance and mechanisms were investigated in a hybrid coagulation - microfiltration (MF) system by using river water spiked with bacteriophage Qβ. Virus removal increased with filtration time: the rate of virus removal was 4 log a...
Water Science and Technology 53 199-207 Jun 2006 [Refereed]
Virus removal experiments using river water spiked with bacteriophages were conducted by an inline coagulation-ceramic microfiltration hybrid system to investigate the effects of filtration flux (62.5 and 125 L/ (m2 × h)) and type of virus (Qβ and...
We studied virus removal from spiked river water by an in-line coagulation-ceramic microfiltration hybrid system to investigate the effects of (1) coagulant dose (0.54, 1.08, and 1.62 mg Al/L), (2) pore size of the MF membrane (0.1, 0.5, and 1.0 μ...
