Abstract: The feasibility of using coking wastewater as make-up water for recirculating cooling systems was investigated by using the static rotary coupon corrosion test to determine the corrosion behavior of bio-treated coking wastewater effluent and tertiary treated coking wastewater.The experimental results showed that the corrosion rate with bio-treated coking wastewater effluent was only 0.025,573 mm/a,much lower than the national standard (GB/T18175-2000),which is 0.125 mm/a.The corrosion of coupon occurred only on the surface and exhibited pitting corrosion characteristics,indicating that bio-treated coking wastewater effluent can be used as recirculating cooling water without additional advanced treatment.Analysis of the organic pollutants of the bio-treated coking wastewater effluent via methods such as UV-Vis,FTIR and GC/MS showed that the organic pollutants contained polar groups C—O,CO,etc.and non-polar groups similar to the organic inhibitor currently used in the cooling recirculation system,which may act as an organic inhibitor.