With reference to the role of biofilters in Recircu- lating Aquaculture System, consider the following statements:1. Biofilters provide waste treatment by removing uneaten fish feed.2. Biofilters convert ammonia present in fish waste to nitrate.3. Biofilters increase phosphorus as a nutrient for fish in water.How many of the statements given above are correct?
✓ Correct answer: b) Only two
ExplanationStatement 1 is correct: The use of biofilters to remove toxins from wastewater and waste gases has advanced in recent decades.In order to remove contaminants from a fluid stream, biofilters fix microorganisms to an inorganic/organic medium (carrier), which has the ability to break down a wide range of chemicals.By removing uneaten fish feed, they additionally perform waste treatment.Statement 2 is correct: By constructing a biofilter correctly, it is possible to regulate ammonia and nitrite concentrations at levels safe for fish.Through the biofiltration process, ammonia nitrogen is converted into nitrite nitrogen, which is subsequently transformed into less harmful nitrate nitrogen, ensuring a conducive environment for fish.Statement 3 is incorrect: Biofilters do not increase phosphorus as a nutrient for fish in water.Phosphorus (P) is actually removed by biofilters to prevent eutrophication in waters.153
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