Mathematics · Percentages and Wastewater Calculations
एक अपशिष्ट जल के नमूने का प्रारंभिक BOD 250 mg/L है। सक्रिय पंक प्रक्रिया (activated sludge process) के माध्यम से द्वितीयक (जैविक) उपचार के बाद, BOD घटकर 25 mg/L हो जाता है। उपचार संयंत्र की BOD हटाने की दक्षता क्या है?
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