With reference to the role of biofilters in Recirculating Aquaculture System, consider the following statements:
- Biofilters provide waste treatment by removing uneaten fish feed.
- Biofilters convert ammonia present in fish waste to nitrate.
- Biofilters increase phosphorus as nutrient for fish in water.
How many of the statements given above are correct?
(a) Only one
(b) Only two
(c) All three
(d) None
ANS B
- A biofilter is a bed of media on which microorganisms attach and grow to form a biological layer called biofilm. Biofiltration is thus usually referred to as a fixed–film process.
- Biofilters convert ammonia nitrogen to nitrite nitrogen and then to the less toxic nitrate nitrogen for the fish
- 3rd incorrect as phosphorus as Biofilters are used to reduce (not increase) the amount of phosphorus in water. Submerged flow biofilters, utilising a filter media were used to remove nitrogen and phosphorus from a synthetic fish farm water. The cyclic aerated/unaerated combined nutrients removal system