{"id":819,"date":"2023-06-15T12:43:38","date_gmt":"2023-06-15T07:13:38","guid":{"rendered":"https:\/\/lotusarise.com\/qna\/?p=819"},"modified":"2024-04-03T07:22:00","modified_gmt":"2024-04-03T01:52:00","slug":"q-with-reference-to-the-role-of-biofilters-in-recirculating-aquaculture-system-consider-the-following-statements","status":"publish","type":"post","link":"https:\/\/lotusarise.com\/qna\/upsc\/q-with-reference-to-the-role-of-biofilters-in-recirculating-aquaculture-system-consider-the-following-statements","title":{"rendered":"Q. With reference to the role of biofilters in Recirculating Aquaculture System, consider the following statements:"},"content":{"rendered":"\n<ol class=\"wp-block-list\">\n<li>Biofilters provide waste treatment by&nbsp;<strong>removing uneaten fish feed.<\/strong><\/li>\n\n\n\n<li>Biofilters convert ammonia present in fish waste to nitrate.<\/li>\n\n\n\n<li>Biofilters&nbsp;<strong>increase phosphorus as nutrient<\/strong>&nbsp;for fish in water.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">How many of the statements given above are correct?<\/p>\n\n\n\n<ul class=\"mcq wp-block-list\">\n<li>Only one<\/li>\n\n\n\n<li>Only two<\/li>\n\n\n\n<li>All three<\/li>\n\n\n\n<li>None.<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><strong>Answer: (a) Only one<\/strong><\/p>\n<\/blockquote>\n\n\n\n<h5 class=\"wp-block-heading\">Biofilters<\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Biofilters are a key component in the<strong>&nbsp;filtration portion<\/strong>&nbsp;of a recirculating aquaculture system (RAS).<\/li>\n\n\n\n<li>They house the nitrifying bacteria and are the primary site where biological nitrification occurs. The\u00a0<strong>biofilters convert ammonia present in fish waste to nitrate.<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Ammonia is removed from an aquarium system through the use of a biofilter.<\/strong>&nbsp;The biofilter provides a substrate on which nitrifying bacteria grow. These nitrifying bacteria consume ammonia and produce nitrite, which is also toxic to fish. Other nitrifying bacteria in the biofilter consume nitrite and&nbsp;<strong>produce nitrate.<\/strong><\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>For healthy and fast growth of aquatic species, fish feed needs to be supplied on a regular basis. This will in turn contaminate pond water due to presence of&nbsp;<strong>uneaten food material<\/strong>, fish fecal matter, growth of algae and other microorganisms. This contaminated water needs to be treated.&nbsp;<strong>These are removed at the level of tank and system treatment zones otherwise it would be detrimental to the efficiency of biofilters.<\/strong><\/li>\n\n\n\n<li><strong>Biofilters are used to reduce (not increase) the amount of phosphorus in water.&nbsp;<\/strong>Submerged flow biofilters, utilising a filter media were&nbsp;<strong>used to remove nitrogen and phosphorus<\/strong>&nbsp;from a synthetic fish farm water. The cyclic aerated\/unaerated combined nutrients removal system achieved approximately 40 percent phosphorus removal, complete nitrification and 40 percent denitrification.<\/li>\n<\/ul>\n\n\n<style>.wp-block-kadence-spacer.kt-block-spacer-_a8cac6-80 .kt-block-spacer{height:40px;}.wp-block-kadence-spacer.kt-block-spacer-_a8cac6-80 .kt-divider{border-top-width:2px;border-top-color:#eee;width:100%;border-top-style:solid;}<\/style>\n<div class=\"wp-block-kadence-spacer aligncenter kt-block-spacer-_a8cac6-80\"><div class=\"kt-block-spacer kt-block-spacer-halign-center\"><hr class=\"kt-divider\"\/><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>How many of the statements given above are correct? Answer: (a) Only one Biofilters<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_kad_blocks_custom_css":"","_kad_blocks_head_custom_js":"","_kad_blocks_body_custom_js":"","_kad_blocks_footer_custom_js":"","_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","footnotes":""},"categories":[1,3],"tags":[36],"years":[50],"class_list":["post-819","post","type-post","status-publish","format-standard","hentry","category-upsc","category-prelims","tag-environment","years-50"],"acf":[],"taxonomy_info":{"category":[{"value":1,"label":"UPSC"},{"value":3,"label":"Prelims"}],"post_tag":[{"value":36,"label":"Environment"}],"years":[{"value":50,"label":"2023"}]},"featured_image_src_large":false,"author_info":{"display_name":"LotusArise","author_link":"https:\/\/lotusarise.com\/qna\/author\/team-lotusarise"},"comment_info":0,"category_info":[{"term_id":1,"name":"UPSC","slug":"upsc","term_group":0,"term_taxonomy_id":1,"taxonomy":"category","description":"","parent":0,"count":1269,"filter":"raw","cat_ID":1,"category_count":1269,"category_description":"","cat_name":"UPSC","category_nicename":"upsc","category_parent":0},{"term_id":3,"name":"Prelims","slug":"prelims","term_group":0,"term_taxonomy_id":3,"taxonomy":"category","description":"","parent":1,"count":1251,"filter":"raw","cat_ID":3,"category_count":1251,"category_description":"","cat_name":"Prelims","category_nicename":"prelims","category_parent":1}],"tag_info":[{"term_id":36,"name":"Environment","slug":"environment","term_group":0,"term_taxonomy_id":36,"taxonomy":"post_tag","description":"","parent":0,"count":193,"filter":"raw"}],"_links":{"self":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/posts\/819","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/comments?post=819"}],"version-history":[{"count":1,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/posts\/819\/revisions"}],"predecessor-version":[{"id":832,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/posts\/819\/revisions\/832"}],"wp:attachment":[{"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/media?parent=819"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/categories?post=819"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/tags?post=819"},{"taxonomy":"years","embeddable":true,"href":"https:\/\/lotusarise.com\/qna\/wp-json\/wp\/v2\/years?post=819"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}