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Table 2

Utilization of tanks at EWL before and after NWL start-up

Before NWL start-upAfter NWL start-up
Primary settling tanks (m328,080 
Used volume (m324,570 14,040 
Used volume (%) 88% 50% 
Contact time (h) 2.3 3.1 
Secondary settling tanks 1 (m337,088 
Used volume (m337,088 27,816 
Used volume (%) 100% 75% 
Contact time (h) 2.6 2.6 
Secondary settling tanks 2 (m326,152 
Used volume (m326,152 26,152 
Used volume (%) 100% 100% 
Contact time (h) 2.9 4.3 
Activated sludge tank (m364,356 
 AnoxOxAnoxOx
Used volume (m37,151 57,205 35,753 28,603 
Used volume (%) 11% 89% 56% 44% 
Contact time (h) 0.31 2.45 2.09 1.68 
Regeneration tank (m318,000 
Used volume (m38,640 9,360 12,960 5,040 
Used volume (%) 48% 52% 72% 28% 
Contact time (h) 2.00 2.17 3.00 1.17 
Before NWL start-upAfter NWL start-up
Primary settling tanks (m328,080 
Used volume (m324,570 14,040 
Used volume (%) 88% 50% 
Contact time (h) 2.3 3.1 
Secondary settling tanks 1 (m337,088 
Used volume (m337,088 27,816 
Used volume (%) 100% 75% 
Contact time (h) 2.6 2.6 
Secondary settling tanks 2 (m326,152 
Used volume (m326,152 26,152 
Used volume (%) 100% 100% 
Contact time (h) 2.9 4.3 
Activated sludge tank (m364,356 
 AnoxOxAnoxOx
Used volume (m37,151 57,205 35,753 28,603 
Used volume (%) 11% 89% 56% 44% 
Contact time (h) 0.31 2.45 2.09 1.68 
Regeneration tank (m318,000 
Used volume (m38,640 9,360 12,960 5,040 
Used volume (%) 48% 52% 72% 28% 
Contact time (h) 2.00 2.17 3.00 1.17 
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