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A coker unit is a thermal cracking process in the oil refinery industry used to recover valuable elements, the most important of which being petroleum coke from main refinery process residues.
Biological Nutrient Removal (BNR) Operation in Wastewater Treatment Plants: WEF Manual of Practice No. 30 (Asce Manual and Reports on Engineering Practice) [Water Environment Federation] on Amazon.com. *FREE* shipping on qualifying offers. BNR is a fast-growing method of removing biological pollutants (bacteria, etc.) from wastewater.