Ishihara Sangyo Kaisha, Ltd.

Kabushiki Kaisha Yakult Honsha

Fujita Corporation

Public Works Research Institute, Ministry of Construction

Noboru Nonoyama

Hiromi Koga

Tsunekazu Watanabe

Keizaburo Watanabe

Masayoshi Kitazume

Yoshio Ohshima

Yukihiro Tomita

At least one part of a road surface is covered by a photocatalyst layer containing a photocatalyst such as titanium dioxide, etc. to purify pollutants in exhaust gases emitted from vehicles by photocatalytic reaction of the photocatalyst. Pollutant-originating matters as retained on the photocatalyst layer are washed away by rain water or sprinkled water. In one embodiment of the invention, road is a road provided with a dewaterable pavement and rain water passes through surface layer during raining, flows over and along base layer and is discharged. In surface layer , numerous aggregates of small particle sizes are projected from the entire surface of concrete layer . Titanium dioxide layer is formed by injecting or spraying a mixture comprising titanium dioxide, cement, a filler and water onto the entire surface of surface layer thinly and is water-permeable.

Air purification-functioning road and method for purifying polluted air over road

Sewage sludge or an agricultural or fish waste material is subjected to pretreatment in the form of wet mill treatment and then is subjected to anaerobic digestion.

Anaerobic digestion method

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Tokyo, Japan

Noboru Nonoyama