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Nanofiltration for the treatment of coke plant ammoniacal wastewaters

机译：纳滤处理焦化厂含氨废水

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摘要

This work addresses the treatment by nanofiltration (NF) of solutions containing NaCN and NH4Cl at various pH values. The NF experiments are carried out in a Lab-Unit equipped with NF-270 membranes for model solutions that are surrogates of industrial ammoniacal wastewaters generated in the coke-making processes. The applied pressure is 30 bar. The main objective is the separation of the compounds NaCN and NH4Cl and the optimization of this separation as a function of the pH. Membrane performance is-highly dependent on solution composition and characteristics, namely on the pH. In fact, the rejection coefficients for the binary model solution containing sodium cyanide are always higher than the rejections coefficients for the ammonium chloride model solution. For ternary solutions (cyanide/ammonium/water) it was observed that for pH values lower than 9 the rejection coefficients to ammonium are well above the ones observed for the cyanides, but for pH values higher than 9.5 there is a drastic decrease in the ammonium rejection coefficients with the increase of the pH. These results take into account the changes that occur in solution, namely, the solute species that are predominant, with the increase of the pH. The fluxes of the model solutions decreased with increased pH.
机译：这项工作致力于通过纳滤（NF）处理包含各种pH值的NaCN和NH4Cl的溶液。 NF实验是在配备NF-270膜的实验室装置中进行的，模型溶液是代焦过程中产生的工业氨废水的替代物。施加的压力为30 bar。主要目的是分离化合物NaCN和NH4Cl，并根据pH值优化该分离。膜的性能高度依赖于溶液的组成和特性，即pH值。实际上，包含氰化钠的二元模型溶液的拒绝系数始终高于氯化铵模型溶液的拒绝系数。对于三元溶液（氰化物/铵/水），观察到pH值低于9时，铵的截留系数远高于氰化物所观察到的，但对于pH值高于9.5时，铵的急剧降低。 pH值越高，排斥系数越高。这些结果考虑到了溶液中随pH升高而发生的变化，即占优势的溶质种类。模型溶液的通量随pH值的增加而降低。

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