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4. The allowable limit of BOD of wastewater to be disposed in rivers is () 45 ppm (11) 30 ppm (11) 100 ppm (iv) 300

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4. The allowable limit of BOD of wastewater to be disposed in rivers is () 45 ppm (11) 30 ppm (11) 100 ppm (iv) 300 ppm

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