Takayuki Shimaoka*, Masataka Hanashima*, Minoru Mihara**, Satoshi Ebisui***, Hideki Tsuji**** and Hiroyuki Itou*****

* Department of Civil Engineering, Faculty of Engineering, Fukuoka University
** Japan Environmental Sanitation Center
*** Planning of Corporate Marketing Department, Hodogaya Chemical Co., Ltd.
**** Chemical Sales Department 4, Ebara Corporation
***** Chemical Products Division, Sumitomo 3M Limited

+ Correspondence should be addressed to Takayuki Shimaoka: Faculty of Engineering, Fukuoka University
(8-19-1 Nanakuma, Johnan-ku, Fukuoka, 814-80 Japan)

Abstract

Houseflies, claws, and offensive odors are still the most common problems in any landfill site. To cope with such problems, various types of pesticides have been used. Intensive use of chemicals, however, has brought about a new concern: it has made the target species more resistant to these pesticides. As a result, the range of chemicals effective against the insect pests has been considerably reduced. Meanwhile, the use of daily cover soil has gone into decline because it occupies quite a large portion of the landfill site, and so reduces the life of the latter.

This paper reports on an experiment conducted with two types of foam (non-hardening and hardening types) in two landfill sites in the southern part of Kyushu. Unlike daily cover soil, foam disappears and so does not waste any space in a landfill site. One site was used as a control; we sprayed the other experimental site with foams for about a month. We then examined the population of houseflies, allowing for meteorological impact on their population density. We used two adhesive ropes as a means of measuring the density of the housefly population. Judging from the results of the experiment, it is suggested that both types of foam are effective for controlling the population of houseflies, and that the foams can replace the daily cover soil.

Key words: landfill site, housefly, daily over material, non-hardening type foam, hardening type foam