Abstract:

Few studies have been devoted to the real-time analysis of the variation in cyanide concentration in a coking wastewater treatment plant，although this is important for the design of such a plant. This work presented a method to allow high-efficiency removal of cyanide，based on the analysis of the data collected from a real A/O₁/H/O₂ coking wastewater treatment plant（Shaogang，Guangdong）. The results showed that the biodegradation rate of cyanide was much slower than that of phenols present in the biological system，and the degradation rate of metal-complexed cyanide was much slower than that associated with uncomplexed cyanide. The effective removal of carbon and nitrogen in the A/O₁/H/O₂ biological system was responsible for achieving high-efficiency biodegradation of cyanide. In addition，this work demonstrated that the high-efficiency treatment of coking wastewater could be realized by taking into account the synergetic effect of biodegradation kinetics for different components and the optimization of operating conditions.