APPROACH TO ACHIEV COMPLIANCE WITH WASTEWATER DISCHARGE REGULATIONS IN BRAZIL FOR BY-PRODUCT COKE PLANTS

摘要

Wastewaters from By-product Coke Oven Plants are among the most difficult-to-treat industrial wastewaters and present unique challenges to achieve the stringent discharge regulations now effective in Brazil. ENVIRON has designed numerous biological treatment systems to remove (in sequence of regulatory requirements) Phenolics, Thiocyanate, Ammonia-nitrogen, and finally Nitrate-nitrogen. Now physical-chemical treatment processes are required to achieve low levels of for Total Cyanide, Selenium, Fluoride, and COD. The presentation will include concepts and selected details from recent coke plant projects, including several from Brazil. Key items to be addressed include methods for biological treatment of coke oven wastewaters for organics and total nitrogen removal, and treatment methods for Total Cyanide, Selenium, and Fluoride compliance. Key performance data will be presented to demonstrate the approach and concepts presented.