ABSTRACT
302Various procedures exist for treating cyanides from different industrial wastewaters, and comprise several physical, chemical and biological methods. It is still widely discussed and examined due to its potential toxicity and environmental impact. Physical and chemical methods are highly expensive and also cause secondary pollution. The treatment of cyanide by said method is rarely used, owing to cost-effectiveness. Thus, there is a pressing need for the development of an alternative treatment process capable of achieving high removal efficiency without troubling the environment. Several microbial species can degrade cyanide well into less toxic products. Biodegradation of cyanide compounds may take place through various enzymatic pathways, the enzymes of which are produced by microorganisms that utilize cyanides as substrate. The biological methods for the treatment of cyanide are not only cost-effective but also do not produce any secondary pollution. The present chapter describes the mechanism and ardent approaches of proficient biological methods for the removal of cyanide compounds and their advantages over other treatment processes.
