Refer the given flowchart sewage treatment, accordingly mathc Column I with Column II and select the correct answer from the codes given below

Options

A. A-(vii), B-(iv),C-(v), D-(iv), E-(ii), F-((ii), G-(i)
B. A-(i), B-(iii), C-(v), D-(vii), E-(ii), F-(iv), G-(iv)
C. A-(i), B-(ii), C-(iii), D-(iv), E-(v), F-(vi), G-(vii)
D. A-(vii), B-(vi), C-(i), D-(ii), E-(iii), F-(iv), G-(v)

Answer

A

Explanation

Primary treatment remove floating and suspended solids from sewage through fitration and sedmientation . Secondary treatement is purley a bioligaical treatement involving microbial acitivity. Most of the suspended material get concentrated and settles down. he sedimentation is called the primary sludge and supermatan is called effuent. The effluent is passed through a sedimentation tank where microbial flocas are allowed to settle down. the settled material is called activated sludge. A part of activated sludge is used as incolum in aeration tank. The remaining is passed into a large tank called anaerobic sludge digester.p