Imhoff cone is used to measure-
Settleable solids
An Imhoff cone is a conical glass container, typically calibrated, used to measure the volume of settleable solids in a liquid over a specific time period, usually one hour. Based on the function and design of the Imhoff cone and the definitions of different solid types, it is clear that the Imhoff cone is used to measure the volume of settleable solids.
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.
