Question 4 (33 marks) You have analysed the wastewater effluents of three industrial plants so that you could propose possible treatment designs to the plant managers. The effluent parameters are listed in Table 1. Table 1: Wastewater effluent parameters for industrial plants 1, 2 and 3. COD (mg/L) BODs (mg/L) Total nitrogen (mg/L) Total suspended solids (mg/L) Plant 1 1499 790 178 3 Plant 2 300 99 50 260 Plant 3 450 153 87 50 5.7 7.7 8.6 (a) Comment on the biodegradability of the compounds in the three wastewater effluents and their denitrification aspects (if applicable). Provide calculation(s) to support your comments. (18 marks) (b) Comment on other characteristics of the wastewater effluents and suggest possible treatment options (e.g. suitable unit operations, overall treatment processes, etc.). (15 marks) Question 4 (33 marks) You have analysed the wastewater effluents of three industrial plants so that you could propose possible treatment designs to the plant managers. The effluent parameters are listed in Table 1. Table 1: Wastewater effluent parameters for industrial plants 1, 2 and 3. COD (mg/L) BODs (mg/L) Total nitrogen (mg/L) Total suspended solids (mg/L) Plant 1 1499 790 178 3 Plant 2 300 99 50 260 Plant 3 450 153 87 50 5.7 7.7 8.6 (a) Comment on the biodegradability of the compounds in the three wastewater effluents and their denitrification aspects (if applicable). Provide calculation(s) to support your comments. (18 marks) (b) Comment on other characteristics of the wastewater effluents and suggest possible treatment options (e.g. suitable unit operations, overall treatment processes, etc.). (15 marks)