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学術研究成果リスト

Detail of Grant Awarded Academic Researches

Project

Study on sterilization of the Tama River water and making drinking water by a non- electric filter with porous ceramics and activated carbon

Academic
Research
No.317
Principal
Investigator
Chiaki Imada
Affiliation
(at that time)
Professor, Tokyo University of Marine Science and Technology
Research
Summary

The waters of the Tama River were collected from 6 sampling points between the middle and lower reaches, and then the water quality survey was conducted.   The results showed that it is difficult to make drinking water with Tama River water due to the high microbial count and high nitrite nitrogen concentrations. Therefore, the present study aimed to achieve the water quality standards for the public bathhouses which can be utilized for laundries, lavatories and bathing in emergency situations of natural disasters. The water was sampled under the Tama-Suido Bridge because the quantity of water is abundant and large cities surround the area. The water samples were collected and then were immediately filtered with yarn winding filter cartridge, and after that the water samples were pumped into the non- electric filter with porous ceramics (CR) and activated carbon (AC).  Because CR+AC did not achieve the water standards for bathhouses, the following two methods were additionally examined; (1) CR and silver coated AC (2) hydrogen peroxide. A method (1) combined with a method (2) as pretreatment achieved the quality standards of tap water in standard plate count bacteria, Escherichia coli and nitrite nitrogen, whereas, drinking water quality standard was not achieved due to a large number of heterotrophic bacterium.  As a conclusion, we succeeded in optimizing the methods to produce water for approximately 1,000 persons per day for the use of laundry and lavatory, whereas, further improvement to sterilize coliform group is needed for the use of bathing water.


Collaborators

Takeshi Terahara

Seiji Suzuki


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