<prompt> The biological oxygen demand BOD indicatesOrganic matterBacterial contentAnaerobic bacteriaChemicals  <response>: Biological Oxygen Demand BOD: Is defined as amount of oxygen absorbed by a sample of sewage during a specified period Generally 5 days, at a specified temperature generally 20 C for aerobic destruction or use of organic matter by living organisms.Strong Sewage has BOD 300 glitre and Weak Sewage has BOD 100 glitre. 