पुनर्चक्रणशील एक्वाकल्चर प्रणाली में जैव निष्यंदकों (बायोफिल्टर) की भूमिका के संबंध में, निम्नलिखित कथनों पर विचार कीजिए :
1. जैव निष्यंदक, बिना खाए हुए मत्स्य चारे को हटाकर, अपशिष्ट उपचार प्रदान करते हैं।
2. जैव निष्यंदक, मत्स्य अपशिष्ट में विद्यमान अमोनिया को नाइट्रेट में बदल देते हैं।
3. जैव निष्यंदक, जल में मत्स्य के लिए पोषक तत्व के रूप में फॉस्फोरस को बढ़ाते हैं।
उपर्युक्त में से कितने कथन सही हैं?
सही उत्तर (B) Only two है।
व्याख्या:
Biological filters, or biofilters, are devices designed to culture microorganisms that perform specific tasks, such as breaking down pollutants. Different microorganisms are suited for different roles, and the art of designing effective biofilters lies in creating an environment that promotes the growth of the desired organisms. Statement 1: Correct Biofilter systems aid in waste treatment by removing substances like uneaten fish feed. They rely on microorganisms capable of degrading various compounds, thereby helping to break down pollutants and maintaining water quality. Statement 2: Correct Ammonia is effectively removed from aquarium systems using biofilters. These filters provide a substrate for nitrifying bacteria to grow. The bacteria consume ammonia, producing nitrite as a byproduct, which is also toxic to fish. Other nitrifying bacteria in the biofilter then convert nitrite into nitrate, a less harmful compound. Statement 3: Incorrect Biofilters are designed to reduce, not increase, phosphorus levels in water. For instance, submerged flow biofilters with specific filter media can remove nitrogen and phosphorus from synthetic fish farm water. A cyclic aerated/unaerated nutrient removal system has been shown to achieve approximately 40% phosphorus removal, complete nitrification, and 40% denitrification.
In English (Question & Model Answer)
With reference to the role of biofilters in Recirculating 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 nutrient for fish in water.
How many of the statements given above are correct?
The correct answer is (B) Only two.
Explanation:
Biological filters, or biofilters, are devices designed to culture microorganisms that perform specific tasks, such as breaking down pollutants. Different microorganisms are suited for different roles, and the art of designing effective biofilters lies in creating an environment that promotes the growth of the desired organisms. Statement 1: Correct Biofilter systems aid in waste treatment by removing substances like uneaten fish feed. They rely on microorganisms capable of degrading various compounds, thereby helping to break down pollutants and maintaining water quality. Statement 2: Correct Ammonia is effectively removed from aquarium systems using biofilters. These filters provide a substrate for nitrifying bacteria to grow. The bacteria consume ammonia, producing nitrite as a byproduct, which is also toxic to fish. Other nitrifying bacteria in the biofilter then convert nitrite into nitrate, a less harmful compound. Statement 3: Incorrect Biofilters are designed to reduce, not increase, phosphorus levels in water. For instance, submerged flow biofilters with specific filter media can remove nitrogen and phosphorus from synthetic fish farm water. A cyclic aerated/unaerated nutrient removal system has been shown to achieve approximately 40% phosphorus removal, complete nitrification, and 40% denitrification.