An industrial plant is proposing to discharge treated effluent at an average flowrate of 55 L...

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An industrial plant is proposing to discharge treated effluent at an average flowrate of 55 L s into a nearby watercourse which has the following upstream characteristics:- 95% ile flowrate BODS Nitrate (NO3-N) Ortho Phosphate (PO-P) It has been stipulated by the licensing authority that the maximum allowable concentrations in the watercourse downstream of the discharge point are as follows:- BOD, Nitrate (NO3-N) Ortho Phosphate (PO4-P) 2.5 m² s¹¹ 0.5 mg L-¹ 4.0 mg L-¹ 0.5 µg L (i) BODS: (ii) NO3-N; (iii) PO₁-P. 1.0 mg L-¹ 5.0 mg L-¹ 1.5 µg L-¹ Assuming conservation of mass and complete transverse mixing across the width of the watercourse, determine the required treated effluent emission standards in terms of the following:- A subsequent review of the receiving water quality by the EPA has concluded that the annual PO-P load should be limited to 20 kg. Establish the revised treated effluent PO4-P discharge standard to comply with this requirement. Describe briefly how the reduced PO-P discharge standard might be achieved. An industrial plant is proposing to discharge treated effluent at an average flowrate of 55 L s into a nearby watercourse which has the following upstream characteristics:- 95% ile flowrate BODS Nitrate (NO3-N) Ortho Phosphate (PO-P) It has been stipulated by the licensing authority that the maximum allowable concentrations in the watercourse downstream of the discharge point are as follows:- BOD, Nitrate (NO3-N) Ortho Phosphate (PO4-P) 2.5 m² s¹¹ 0.5 mg L-¹ 4.0 mg L-¹ 0.5 µg L (i) BODS: (ii) NO3-N; (iii) PO₁-P. 1.0 mg L-¹ 5.0 mg L-¹ 1.5 µg L-¹ Assuming conservation of mass and complete transverse mixing across the width of the watercourse, determine the required treated effluent emission standards in terms of the following:- A subsequent review of the receiving water quality by the EPA has concluded that the annual PO-P load should be limited to 20 kg. Establish the revised treated effluent PO4-P discharge standard to comply with this requirement. Describe briefly how the reduced PO-P discharge standard might be achieved.

Answer rating: 100% (QA)

1 BOD5 Upstream BOD 05 mgL Upstream flow 25 m3s Upstream BOD load 05 25 125 kgs Allo... View the full answer