Research of oil ball countermeasures through high-speed filtration

Y. Nakayama & N. Nakamura
ABSTRACT Combined sewer systems entail a problem of direct discharge of some wastewater into public water areas. In Yokohama, too, combined systems serve about 25 percent (10,000 hectares) of the city area, and reduction of the pollutant load discharged into Tokyo Bay in wet weather is an important priority. The central districts have many restaurants, and wastewater from them contains a lot of oil and fat, and forms oil balls inside sewers. In heavy rainfalls,...
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