Test: High Rate Trickling Filter And Secondary Clarifier

Explanation: The maximum and minimum removal of suspended and dissolved impurities from the sewage is 92% and 65% respectively.

Explanation: The color of the secondary sludge produced from the high rate trickling filter is brown and the secondary sludge obtained is partially oxidized.

Explanation: Recirculation ratio is the ratio of volume of recirculated sewage to the raw sewage. It is denoted by R/I where, ‘R’ is the recirculated sewage and I is the volume of raw sewage.

Explanation: The range of organic loading in high rate trickling filter lies between 6000 to 18000 kg of 5 days BOD per hectare metre of filter media per day.

Explanation: The size of filter media in a high rate trickling filter is 25-60mm and it can be a rock, slag or any synthetic material.

Explanation: The range of surface loading rate of a secondary clarifier lies between 40,000 litres/m²/day to 70,000 litres/m²/day.

Explanation: The detention period of a secondary clarifier is between 1.5 hours to 2 hours.

Explanation: When nitrogen is formed in the sludge, the rise of the sludge mass takes place. This phenomena is called as rising sludge.

Explanation: The minimum and maximum weir loading rate of primary clarifier is 125000 and 500000 m³/m/day respectively.

Explanation: Hopper bottom vertical flow type tank is circular in shape and it consists of conical hoppers.