Rules for draining sewage from factories and business establishments into sewers

It doesn't mean that any water can flow into the sewer.

For example, highly acidic sewage corrodes concrete in the sewer pipe. Sewage containing harmful substances such as heavy metals and cyanins and acids and alkalis weakens the action of microorganisms that treat sewage at sewage treatment plants and reduces sewage treatment functions. In addition, high concentrations of organic matter and suspended matter, such as oils and fats, clog sewer pipes and increase the burden of sewage treatment.

In addition, heavy metals interfere with the treatment function of the treatment plant, and are concentrated and accumulated in the generated sludge, making it difficult to landfill or reuse it.

In order to prevent such various obstacles and to always maintain the function of sewerage facilities normally, the Sewerage Law (outside site) and the Yokohama City Sewerage Ordinance stipulate the standards for water quality flowing into the sewerage system.

Factories and business establishments cannot drain sewage that exceeds this water quality standard. Sewage that may exceed the water quality standards must be drained to the sewer after taking some measures, such as setting up a sewage treatment facility (abatement facility).

Of these factories and business establishments, factories and business establishments that require the establishment of specific business establishments and abatement facilities stipulated by law are required to submit a notification under the Sewerage Law (outside site) and the Yokohama City Sewerage Ordinance. I am.

In addition to the above, there are rules such as an obligation to measure the quality of the company's sewage and reporting on the status of maintenance and management of abatement facilities.