Question

6. explaining screening process in sewage treatment.​

Answer 1

Answer:

• Screening is a wastewater pre-treatment, which aims to prevent coarse solids, such as plastics, rags and other trash, from entering a sewage system or treatment plant.

• Solids get trapped by inclined screens or bar racks. The spacing between the bars usually is 15 to 40 mm, depending on cleaning patterns.

Answer 2

Answer:

Screening is the first stage of the wastewater treatment process. Screening removes large objects like diapers, nappies, sanitary items, cotton buds, face wipes, and even broken bottles, bottle tops, plastics, and rags that may block or damage equipment. Special equipment is used to remove grit that gets washed into the sewer.

Explanation: