Q 6. How to measure BOD?. 1. Measure the volume of a sample of water in a dark bottle. Measure its oxygen level by oxygen meter / chemical method. 2. Incubate the water at 20 oC in dark to prevent photosynthesis for 5 days. 3. Measure the oxygen level again.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
matter and microorganisms
indicate the degree of water
BOD high degree of pollution high
BOD low degree of pollution low
Mayfly nymph / dragonfly nymph
source of pollution.
1. Point of outfall of sewage
(organic matter e.g. urea,
protein, dietary fibre +
2. organic matter -------------------------
3. Ammonium --------------- nitrite nitrate
4. O2 clean water species + polluted species