Takaya Higuchi

Takaya Higuchi
Yamaguchi University

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22
Publications
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Introduction
Skills and Expertise

Publications

Publications (22)
Article
Full-text available
Odours discharged from wastewater treatment plants generally cause severe damage to locals. When facility odors affect air quality and cause citizen complaints, an investigation of those odours may require using standardized scientific methods. Odour intensity is one of the main odour characterization parameter, and represents an important sensory...
Article
Full-text available
In the modern world of wastewater treatment, control of odors has moved from an afterthought to a primary design consideration for most collection and treatment facilities. As development encroaches on our facilities and our new neighbours become less tolerant of nuisance odors, wastewater professionals have found the need to address odor as a prim...
Article
The Great East Japan Earthquake, occurred on March 11, 2001, brought a great deal of damages to the vast coastal area through tsunamis which were generated right after earthquake. The tidal waves also caused a large-scale and intense malodor in some regions because a huge amount of seafood having been stored in fishing ports were scattered extensiv...
Article
Practical reference odors for quality control in olfactometry were developed keeping actual odor index measurement in mind. Pig farm odor and odor of sewage sand sedimentation tank were chosen as reference odors for ambient odor measurement and exhaust odor measurement, respectively. Odor components and the concentrations of odorous substances of t...
Article
The Offensive Odor Control Law, enacted in 1971 in Japan, regulates odors based on the concentrations of specified offensive odor substances or an odor index. The City of Ube, a typical industrial city in Japan, has established and implemented a unique system for environmental odor management. The city has concluded an agreement with local factorie...
Article
The triangle odor bag method, the most popular olfactory sensory test in Japan, was first developed in 1972, and introduced into the Offensive Odor Control Law in 1995. This is an air dilution method in which "odor index" is measured. In recent years, the necessity of developing quality control system for olfactometry and standardization of measure...
Article
In Japan, the necessity of developing quality control system for olfactometry and standardization of measurement procedure for the promotion of nationwide spread of olfactometry has been recognized especially in recent years. In this paper, the establishment of quality control framework for olfactometry in Japan, including selection of a reference...
Article
A new sensory measurement method for odor emitted from wastewater based on the triangle odor bag method (TOBM) was proposed. In this method, odor index (logarithm of odor concentration, multiplied by ten) of the headspace gas in an equilibrium state with the sample liquid is measured by the TOBM. Three experiments were conducted to compare the TOBM...
Article
In Report 1, a model was proposed for the elimination of air pollutants by plant layers. This has implications to overcome air pollution using road‐side trees and forests because plant layers act as a chemical reactor. In discussing the model, some of the elimination factors were investigated and the diffusion coefficients of flow direction were ob...
Article
Two psychophysical experiments were made to explore the attribute of “odor” and “pungency” in respect of inhalation time and continuous exposure. Four or three subjects judged perceived intensity of odor and pungency in them. In the first experiment perceived odor intensity increased gradually according as the inhalation time became longer at lower...
Article
The complaints about stinking gases emitted from factories have increased and so much expanded that emission of odorous gases is now a major environmental problem, since people have become environmentally conscious, demanding a comfortable environment. The method of biological deodorization has drawn attention owing to its several merits such as tr...
Article
An expedition to Mohenjo-daro was made by a team of Japanese researchers in 1993.Water supply and sewerage systems were mainly investigated. Development of the systems seemed to be motivated by ritual ablution which required a relatively large volume of water and its proper drainage inside houses. Burnt bricks were durable materials for sewerage co...
Article
地表の連続面源からの浮力を持たない排出物の輸送に関して3次元の定常大気拡散式の解析解を求めることができた.このモデルには風速と鉛直方向の渦拡散係数 (eddy diffusivity) の変化に対して高さの巾乗則を組み込み, 横方向の渦拡散係数を風速と風に垂直な方向の拡散係数の関数としてあらわし, 除去のメカニズムとして乾燥沈降 (dry deposition) を含んでいる.このモデルは中立と安定の大気条件下で面源付近および風下濃度レベルの予測によく適合する.汚染物の拡散に及ぼす重要なモデルパラメータの影響を検討した.いくつかのシミュレーションの結果から, 同じ排出強度の線源と点源の場合を比較し, 短い風下距離に対して汚染物濃度の予測は, 排出源の構造を考慮に入れなければ著しく不正確となる...
Article
Discussion of non-olfactory 'irritation', which is caused by the excitement of the trigeminal nerve, has important implications for odor pollution. The main purpose of this study is to work out the mechanisms for the generation of non-olfactory irritation, and the sensory characteristics of the perceived irritation. Concentrations of subjectively e...
Article
The effectiveness of essential oil to eliminate odorants has been shown by many studies. On this basis, the present research has been undertaken to develop a technique using road‐side plants for eliminating gaseous pollutants. A model for the sorption of pollutants by plants has been developed and diffusion coefficients in the plant layer have been...

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