1. caused by wastewater and sewage from a community source. 2. the waste water from factories3. waste water originating from nature may be due to spoilage when there is no water in the circulation slide transfer.4. arising from agriculture, because the farmers most commonly used cleaners kill the grass.It contains the plant residue and surface soil.When it rains, it will remove the residual toxic substances into rivers, canals, causing water pollution.
การแปล กรุณารอสักครู่..