Question

“BOD is commonly calculated as an index of water pollution.”
A. Do you agree with this statement? Why?
B. Expand BOD

Answer 1

Hint:- BOD, additionally called biochemical oxygen demand, is another very common index of the exception of water based on quantification of the general awareness of natural materials with the aid of using their impact at the respiratory of a microbial biomass.

Complete answer:
The cutting-edge global preferred approach is the five‐day BOD assay (BOD5). The test measures the quantity of dissolved oxygen required for the microbial oxidation of carbonaceous natural material below detailed conditions. The check has its widest software in measuring waste loadings to test vegetation.
Practical problems exist related to the BOD5 check, which includes sensitivity to temperature and oxygen concentration, the effect of toxins, loss of stoichiometric validation, and the want to dilute samples. The check is exertions extensive with variable results, however, the fundamental disadvantage is still the five‐day dimension time.
For all its shortcomings and the supply of some of the associated dimension techniques, the BOD5 assay stays the favored check for reporting the oxygen necessities of wastewaters, effluents, and polluted water, in part, due to its global regulatory status, however additionally time simulates the microbial decomposition of natural wastes within the environment, thereby approximating the reaction of natural ecosystems.

Note:- It is vital to display water quality over a time period if you want to come across modifications within the water's ecosystem. The Water Quality Index came into advanced in the early 1970s, can supply an illustration of the fitness of the watershed at numerous factors and may be used to maintain and examine modifications over time. Although specialized devices are utilized by water technologists to measure BOD, a near approximation of BOD values may be acquired with the aid of using the use of a dissolved oxygen check package and waiting 5 days.