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Treatment of cyanide bearing effluents by adsorption, biodegradation and combined processes: effect of process parameters

机译：通过吸附，生物降解和联合工艺处理含氰化物废水：工艺参数的影响

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摘要

The present investigation focused on a comparative study for the removal of cyanide from separate solutions of sodium, zinc and iron cyanide compounds by three different processes such as; adsorption, biodegradation and simultaneous adsorption and biodegradation (SAB) processes. Adsorption studies were carried out on commercial granular activated carbon (GAC). Biodegradation and SAB studies were conducted with suspended and immobilized cultures of Pseudomonas putida, respectively. Effect of pH, temperature and agitation time on percentage removal of cyanide was measured at an initial cyanide concentration of 100 mg/L and it was found that these parameters significantly affect the three process performances. The SAB process was found to have better removal efficiency as compared to adsorption and biodegradation processes. SAB process could achieve more than 95% removal efficiency for cyanide concentrations up to 100 mg/L in sodium, zinc and iron cyanide solutions. Higher percentage of cyanide removal and specific uptake was achieved in case of zinc-cyanide complexes as compared to other cyanide complexes. Adsorption isotherms evaluated the uptake and degradation on cyanide in SAB process.
机译：本研究的重点是通过三种不同的方法从氰化钠，锌和铁的化合物的单独溶液中除去氰化物的比较研究。吸附，生物降解以及同时吸附和生物降解（SAB）过程。在商业颗粒活性炭（GAC）上进行了吸附研究。生物降解和SAB研究分别在假单胞假单胞菌的悬浮培养物和固定化培养物中进行。在初始氰化物浓度为100 mg / L的条件下，测量了pH，温度和搅拌时间对氰化物去除百分率的影响，发现这些参数显着影响这三种工艺的性能。与吸附和生物降解过程相比，发现SAB过程具有更好的去除效率。对于氰化钠，锌和铁的氰化物浓度高达100 mg / L的SAB工艺，去除效率可达到95％以上。与其他氰化物配合物相比，锌-氰化物配合物可实现更高的氰化物去除率和比吸收率。吸附等温线评估了SAB工艺中氰化物的吸收和降解。

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