A rapid test to indicate the intensity of pollution of water is-
Dissolved Oxygen
Dissolved Oxygen is the amount of oxygen available to living aquatic organisms in water. Therefore, a low level of dissolved oxygen is a strong indicator of high organic pollution intensity. Based on the requirement for a rapid test indicating pollution intensity , Dissolved Oxygen is the most appropriate answer among the choices provided because its measurement is quick and low values strongly suggest significant organic pollution.
Important Questions from Quality and Characteristics of Sewage
Conventionally, the biochemical oxygen demand (BOD) is measured for _______ days.
Consider the following statements:
1. Ammonia nitrogen is a measure of nitrogen present as ammonium hydroxide and ammonium salts. It will progressively decrease as sewage gets treated.
2. Organic nitrogen is the total nitrogenous matter in sewages excepting that present as ammonia nitrogen, nitrites and nitrates. It becomes ammonia in anaerobic decomposition and nitrites or nitrates in aerobic decomposition.
Which of the above statements is/are correct?Identify the correct relation from the following:
Where BOD, COD, and TOD are Biochemical, Chemical, and Theoretical oxygen demand, respectively.
What is the correct range of \(\frac{{BO{D_u}}}{{COD}}\) for a waste water to be considered as fully biodegradable?
(where BODu = ultimate Bio-chemical oxygen demand and COD = chemical oxygen demand)
Determine ultimate BOD for sewage having 5-day BOD at 20°C as 180 ppm. Assume the de-oxygenation constant as 0.8 per day.
