Water source pollution is mainly due to the discharge of sewage without treatment. This sewage includes industrial sewage, domestic sewage, hospital sewage, etc. I will explain factory sewage.
Water pollution is mainly due to sewage discharge without treatment, such as industrial sewage, domestic sewage, hospital sewage. I'll explain the factory sewage.
Water pollution is mainly due to the discharge of sewage without treatment, which includes industrial sewage, domestic sewage, hospital sewage, etc. I will explain the factory sewage.<br>