Environment & Ecology · Environmental Science
अपशिष्ट जल (wastewater) का द्वितीयक उपचार मुख्य रूप से किस पर आधारित है?
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- 4सूक्ष्मजीव गतिविधियां (Microbial activities)✓
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सूक्ष्मजीव गतिविधियां (Microbial activities)
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