Sewage Treatment

Sewage Treatment is a Science & Technology concept from the MPSC syllabus, tested in 3 past MPSC questions (2020). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.

Real questions

Years tested

1 · 2020–2020

In context

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Asked in

2020

What you need to know first

Aerobic vs Anaerobic processesRespiration and decomposition basicsMicrobiology basicsNutrient Cycling

Real questions that test this

खालीलपैकी कोणती विधाने चूक आहेत ? / Which of the following are incorrect statements ?

(a)जिवाणूंच्या नॉनएरोबिक अपघटनाला, एरोबिक अपघटनापेक्षा प्राधान्य दिले जात नाही. / A non-aerobic decomposition is not preferred over an aerobic decomposition by bacteria.

(b)सरंध्र मातीला गाळण क्रियेत प्राधान्य दिले जात नाही. / Porous soil is not preferred for filtration.

(c)मातीत असलेले सेंद्रिय आम्ल मातीची सुपीकता कमी करतात. / Organic acids present in soil decrease the fertility of soil.

(d)खडकळ जमिन, गाळण प्रक्रियेला आणि नॉनएरोबिक अपघटनाला उपयुक्त नाही. / Rocky soils are unsuitable for filtration and non-aerobic decomposition.

1)फक्त (b) आणि (c) / Only (b) and (c)✓ Correct

2)फक्त (c) आणि (d) / Only (c) and (d)

3)(a), (b), (c)

4)(b), (c), (d)

Statements (b) and (c) are incorrect because porous soil is indeed preferred for filtration, and organic acids do not necessarily decrease overall soil fertility inappropriately in all contexts.

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

1)(a) आणि (b) / (a) and (b)

2)(b) / (b)✓ Correct

3)(b) आणि (c) / (b) and (c)

4)वरीलपैकी कोणतेही नाही / None of the above

During aerobic decomposition by bacteria, the carbon dioxide produced is interchanged with atmospheric oxygen to sustain the biological process.

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

1)(a), (c)

2)(b), (c)

3)(b), (d)✓ Correct

4)(b), (c), (d)

Sewage is converted into plant food (nutrients like nitrates and phosphates) primarily through chemical actions and the action of bacteria.

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