Kimiaki Hirayama's research while affiliated with University of Yamanashi and other places

Publications (29)

Article
Full-text available
Most bio-waste contains a high amount of moisture, but has high caloric value if dried. Effective drying could produce solid fuel from bio-waste. This paper discusses the effectiveness of drying with aerobic microbiological degradation similar to a composting process. Wood chips (WC) that show little bio-degradation and a mixture of WC and dogfood...
Article
Full-text available
Organic solid waste composting is a complex process that involves many coupled physical, chemical and biological mechanisms. To understand this complexity and to ease in planning, design and management of the composting plant, mathematical model for simulation is usually applied. The aim of this paper is to develop a mathematical model of organic s...
Article
We attempted to remove mono-chlorophenols (MCPs) with a slow sand filter and UV irradiation, and compared the removability and the structure. The phenols examined are 2-chlorophenol (2-CP), 3-chlorophenol (3-CP) and 4-chlorophenol (4-CP). MCPs were also examined for removal under ultraviolet (UV) lamp irradiation and the relationship between degrad...
Article
We examined the degradation of dibromophenols (DBPs), i.e. 2,4-DBP, 2,6-DBP and 3,5-DBP by ultraviolet (UV) irradiation and estimated the relationship between degradability and molecular orbital properties of each dibromophenol. The removal of DBPs under a UV lamp system was successfully performed in an aqueous solution. After 5 min of irradiation,...
Article
This paper presents insight into the benefits of organic waste recycling through composting over landfill, in terms of landfill life extension, compost product, and mitigation of greenhouse gases (GHGs). Future waste generation from 2003 to 2020 was forecast, and five scenarios of organic waste recycling in the municipality of Phnom Penh (MPP), Cam...
Article
This paper presents a mathematical model of vertical water movement and a performance evaluation of the model in static pile composting operated with neither air supply nor turning. The vertical moisture content (MC) model was developed with consideration of evaporation (internal and external evaporation), diffusion (liquid and vapour diffusion) an...
Article
Full-text available
The aims of these experiments were treating tapioca processing waste water to produce polyhydroxyalkanoates (PHAs) and removal of chemical oxygen demand (COD). The experiments were conducted in a sequencing batch reactor with a volume of 6 L. The entire experimental condition was anaerobic-aerobic-anaerobic. Experiment 1, 2 and 3 had the first 2 h...
Poster
Full-text available
This experiment aims to examine how much PHA is produced and how much COD is removed by treating tapioca processing wastewater. We examined using a sequencing batch reactor (SBR) with a volume of 6 L. The SBR was operated for 9 hours with the first 2 hours for feeding and the last 3 hours for settling and draining. The 4 hours between these periods...
Article
This paper presents an overview of municipal solid waste management (MSWM) for both technical and regulatory arrangements in the municipality of Phnom Penh (MPP), Cambodia. Problems with the current MSWM are identified, and challenges and recommendations for future improvement are also given in this paper. MPP is a small city with a total area of a...
Article
Full-text available
This paper presents a current tapioca starch wastewater (TSW) management in Indonesia, for both technologies and regulations. Finding about the current TSW management is presented. Indonesia is the third largest tapioca starch producer in the world after Thailand and Brazil. As a result, tapioca starch wastewater (TSW) is increasing. TSW pollutes t...
Article
Tetrabromobisphenol A (TBBPA) is one of the widely used flame retardants in industrial products such as plastic polymers and electronic circuits, and has the potential to enter the water environment after disposal of these products. We tried to remove TBBPA in water by slow sand filtration and UV irradiation. The removal efficiency of TBBPA in rive...
Article
A compensating effect in the reduction of bisphenols (BPs) has been shown using biodegradation in slow sand filtration and advanced photocatalysis. We tried to remove 8 kinds of BP by slow sand filtration. Removal rates of BPA, BPB, BPE, BPF, BPS, thiobisphenol (TBP), and dihydroxybenzophenone (DHB) indicated a high removal rate up to more than 90%...
Conference Paper
Pyrene is a high molecular weight polycyclic aromatic hydrocarbon (PAH) that is found in water systems worldwide. It is harmful to living organisms, even when taken in very small amounts. The photocatalytic degradation of pyrene in porous Pt/TiO2-SiO2 photocatalyst (PPtPC) suspension under UV irradiation was investigated in this study. PPtPC was pr...
Article
In order to develop a short-term algal toxicity test, the growth of and the phosphate uptake by the green alga Selenastrum capricornutum during batch culture were observed. In the control medium, S. capricornutum took up phosphate earlier than it grew. It was also observed that the phosphate uptake was inhibited by the presence of a toxicant. From...
Article
これまでに開水路で測定された酸素移動係数の値を整理し, 酸素移動係数と水面付近の乱れパラメータの関係を検討した. 乱れパラメータは水深や摩擦速度などのマクロな水理量から推定した.実験水路での測定結果を中心に考察したが, 再ばっ気現象に対するエネルギー逸散率モデルと乱れ強度モデルの適用性の比較をおこない, 乱れ強度モデルの有効性を示した. また, 自然河川を含む開水路の測定結果は, およそ3つのグループに分けられることを指摘した. そして, 撹拌槽での測定結果との比較もふまえて, 乱れ強度モデルにもとづいた, 河川での再ばっ気係数を求めるための関係式を導いた.
Article
Biodegradation of phenol and monochlorophenols (CPs) by a yeast strain of Rhodotorula glutinis was examined. The strain completely degraded 5 mM of phenol and utilized phenol as a sole carbon source, The strain may degrade phenol by the 'ortho' type of ring fission because muconolactone was observed in the cultured broth. 3-Chlorophenol (3-CP) and...
Article
Either of two different hydraulic parameters is incorporated into KL-predicting equations. They are energy dissipation and turbulence intensity. We examine KL-temperature dependency and velocity-temperature dependency in a stirred vessel and compare KL-predicting equations by checking whether they produce a temperature coefficient falling within an...
Article
Aromatic degradation by two yeast strains of Rhodotorula (R.) rubra was examined. Separation and identification of phenol and protocatechuic acid (PCA) metabolites were carried out using high performance liquid chromatography (HPLC) and gas chromatography/mass spectrometry (GC/MS). For HPLC analysis of β -ketoadipic acid, 2,4-dinitrophenylhydrazone...
Article
Full-text available
The metabolic pathway of phenol was examined in the yeast strains of Rhodotorula (R.) rubra IFO 0892 and 1101. Changes in concentrations of phenol, phenol metabolites and dissolved organic carbon (DOC) in a medium were determined during incubation of phenol-grown cells with a phenol solution. A decrease in DOC concentration indicated that phenol wa...
Article
Full-text available
The effect of phenol on the growth and oxygen uptake rate was studied in several strains in the genus Rhodotorula, and the degradation route of phenol by two yeast strains of Rhodotorula rubra was examined. Rhodotorula rubra IFO 0870, 0889, 0892, 1100 and 1101 grew well in medium containing 250 mg/l phenol. Rhodotorula rubra IFO 0870 still showed a...
Article
Full-text available
Nitrate removal in a medium (at /C) and the e#ect of culture tempera-ture on the fatty acid composition were investigated using Candida sp. which was isolated from the upper layer of Lake Vanda in the McMurdo Dry Valleys, Antarctica. The strain was cultured at /C aerobically, on a synthetic medium containing potassi-um nitrate (NO--N, +** mg l +) a...

Citations

... Using P. putida as a model organism, the constituents and biochemistry of the different branches of the ß-ketoadipate pathway was elucidated in the mid-1960s by Ornston and Stainer (Ornston and Stanier, 1966). Since then, this pathway has been discovered and described in numerous prokaryotes: predominantly in soil, forest and termite gut isolates (see Table 6 Michielse et al., 2012), as well as unicellular yeasts from the Rhodotorula (Cook and Cain, 1974;Jarboui et al., 2012;Katayama-Hirayama et al., 1992;Shimaya and Fujii, 2000) and Candida genera (Holesova et al., 2011;Krug et al., 1985;Wang et al., 2011). In a majority of the known aromatic degrading microbes, the upper funneling pathways are linked to the β-KA pathway by the protocatechuate/catechol catabolic node (Harwood and Parales, 1996;Pérez-Pantoja et al., 2010). ...
... These activities greatly reduce the possibility of electron-hole recombination, resulting in stronger photocatalytic reactions [31]. Our previous works proved that a porous photocatalyst Pt/TiO 2 -SiO 2 could efficiently decompose PYR, a four-ring PAH [34, 35]. It was also interesting to know the efficiency of Pt/TiO 2 -SiO 2 for decomposing other PAHs. ...
... Various studies have been conducted on the application of SSF and HSSF for the removal of pharmaceutical and personal care products (PPCPs) and endocrine-disrupting chemicals (EDCs) from water and wastewater (D'Alessio et al., 2015;Haig et al., 2016;Katayama-Hirayama et al., 2010;Li et al., 2018;Pompei et al., 2017). These authors evaluated filtration rates between 0.02 and 4.8 m 3 m À2 day À1 and the mean removal efficiencies were between 11 and 92% for the target compounds. ...
... Cassava processing wastewater (CPW) is a carbohydrate-rich residue generated in large amounts during cassava flour and starch production. It has been estimated that the volume of cassava wastewater generated by beneficiation of 1 ton of roots ranges from 300 to 3000 L [8,10,11] due to different dilutions during processing. ...
... 3 Considering biological activities, composting is a complex process that involves many physical, chemical, and biological mechanisms. 4 Therefore, it is necessary to develop and/or improve existing mathematical models from the engineering aspect. Mathematical modelling and optimisation in any case facilitate the understanding of any process, even the process of aerobic degradation. ...
... Phenol and its higher homologues are aromatic molecules containing hydroxyl group attached to the benzene ring. Phenolic compounds are widely distributed in the environment from various industrial as well as natural sources [1][2][3]. Phenol pollution is associated with petroleum refineries, pharmaceuticals, pulp mills, gas and coke oven industries, explosive manufacture, phenol-formaldehyde resin manufacture, plastic and varnish industries, wood processing industries etc [4][5][6][7]. ...
... Many bacterial and fungal species have been reported as able to break down different types of bioplastic. There are many bacterial strains exhibiting biodegradable activity towards polyesters such as PBSA, PBS or PCL, belonging to the following genera: Tenacibaculum, Alcanivorax, Pseudomonas, Arcobacter, Methanobacterium, Methanosaeta, Alcaligenes, Clostridium, Streptomyces, Pseudozyma, Lysinibacillus, Shewanella, Moritella, Psychrobacter, Alcanivorax, Tenacibaculum, Rhodococcus, Bacillus, Alcaligenes, Shewanella, Brevundimonas, Amycolatopsis, Thermopolyspora, Microbispora, Excellospora, Acidovorax, Acinetobacter (Pranamuda et al., 1995;Uchida et al., 2000;Jarerat and Tokiwa, 2001;Zhao et al., 2005b, Xu et al., 2007Sekiguchi et al., 2010;Ochiai et al., 2012;Chua et al., 2013;Ghosh et al., 2013;Hemashenpaham et al., 2013;Abdel-Motaal et al., 2014;Yagi et al., 2014;Nawaz et al., 2015;Urbanek et al., 2017;Nchedo Ariole and George-West, 2020). Fungal strains include the following: Aspergillus, Fusarium, Penicillium, Clonostachys, Trichoderma, Paecilomyces, Thermomyces, Filobasidium, Alternaria, Bionectria, Cunninghamella, Thermomyces (Cook et al., 1981;Nishide et al., 1999;Kim and Rhee, 2003;Zhao et al., 2005a;Zhao et al., 2005b;Abe et al., 2010;Sun et al., 2010;Kitamoto et al., 2011;Mei et al., 2012;Urbanek et al., 2017, Jung et al., 2018Abdel-Motaal et al., 2020;Nchedo Ariole and George-West, 2020). ...
... There have been many attempts to simulate the composting process from small laboratory scale to large-scale systems in either one or two-dimension scheme (Smith and Eilers, 1980;Nakasaki et al., 1987;Roger, 1993;Stombaugh and Nokes, 1994;Kaiser, 1996;Das and Keener, 1997;Nakasaki et al., 2000;Kaneko et al., 2001;Li and Jenkins, 2003;Sole-Mauri et al., 2007). These models have different characteristics, e.g., strong at degradation process modeling, focusing on only mass/energy transport modeling, or lacking of spatial variation. ...
... However, this system does not work efficiently in winter due to the adverse effects of low temperatures on microbial function. The use of microorganisms isolated from polar regions to remove nitrogen and phosphorus compounds from wastewater under low-temperature conditions has been reported by Chevalier et al. (2000) and Hirayama-Katayama et al. (2003), but it has not yet been applied for milk fat. ...
... Nonthermal, atmospheric-pressure plasma is attracting attentions in the water-treatment for the prevention of the pollution of drinking-water reservoirs by aromatic compounds. The plasma-degradation of the aromatic compound is in several forms: the pulse-streamer discharge and direct current contact glow discharge [3,4], high intensity UV radiation [5]. In recent works, the decomposition of aromatic compound was reported in multi-gas compact dielectric barrier discharge 2, 6-dibromophenol (DBP) [6] and the experimental discovery of the plasma degradation of 2, 4 -DNP , 2, 5 -DNP, and 3,4 -DNP [7,8]. ...