Environment & Ecology · Environmental Engineering
धीमी बालू छानक (स्लो सैंड फ़िल्टर) की ऊपरी परत पर बनने वाली सक्रिय जैविक परत को क्या कहा जाता है?
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श्मुट्ज़डेके (Schmutzdecke) क्षेत्र
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