Activated sludge process
Activated sludge process is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2020). Below are those real questions with their correct answers and explanations.
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Real questions that test this
सांडपाण्याचे वनस्पती खाद्यमध्ये रूपांतर ......... मुळे होते. / The sewage is converted into plant food by :
(a)भौतिक क्रिया / Physical action
(b)रासायनिक क्रिया / Chemical action
(c)कार्बन डायऑक्साइड / Carbon dioxide
(d)जीवाणू / Bacteria
Sewage is converted into plant food (nutrients like nitrates and phosphates) primarily through chemical actions and the action of bacteria.
सांडपाण्याच्या जीवाणू मार्फत होणाऱ्या एरोबिक अपघटनाच्या प्रक्रियेत ______ / During the aerobic decomposition of sewage, by bacteria ______
(a)आवश्यक असलेला ऑक्सिजन हा सरळ वातावरणातून घेतला जातो / the required oxygen is directly taken from the atmosphere
(b)तयार झालेल्या कार्बन डायऑक्साइडची अदलाबदल वातावरणातील ऑक्सिजन बरोबर होते / the produced carbon dioxide is interchanged with the atmospheric oxygen
(c)मातीच्या विविध थरात उपलब्ध असलेला कार्बन डायऑक्साइड वापरला जातो / the carbon dioxide present in different layers of soil is used
During aerobic decomposition by bacteria, the carbon dioxide produced is interchanged with atmospheric oxygen to sustain the biological process.