Brown N W, Roberts E P L, Garforth A A, Dryfe R A W
Department of Chemical Engineering, UMIST, PO Box 88, Manchester M601QD, UK.
Water Sci Technol. 2004;49(4):219-25.
Adsorption is an attractive route for the removal of coloured, toxic and non-biodegradable organics from wastewater as very low discharge standards can be achieved. This paper reports on the use of a novel carbon-based material, Nyex100, as an adsorbent material for the treatment of dyehouse effluent. The adsorbent has low porosity and high electrical conductivity and these factors have allowed the adsorbent to be electrochemically regenerated. This work has demonstrated that the adsorbent can be cycled through the process of adsorption and regeneration a number of times with little drop in adsorptive capacity. However regeneration appears to modify the preference for organic species adsorption. Electrochemical regeneration can be rapidly achieved (15-20 minutes) using low current densities (< 20 mA cm(-2)). However, the low adsorptive capacity of the adsorbent, because of its small surface area, means that large quantities of adsorbent would need to be cycled within the process to treat the effluent volume generated in even small dyehouses. Thus, it is believed that operating the process in this mode limits the practical application of this technology.
吸附是从废水中去除有色、有毒和不可生物降解有机物的一种有吸引力的途径，因为可以实现非常低的排放标准。本文报道了一种新型碳基材料Nyex100作为吸附剂用于处理印染废水的情况。该吸附剂孔隙率低且电导率高，这些因素使得吸附剂能够进行电化学再生。这项工作表明，吸附剂可以在吸附和再生过程中循环多次，而吸附容量几乎没有下降。然而，再生似乎会改变对有机物种吸附的偏好。使用低电流密度（<20 mA cm(-2)）可以快速实现电化学再生（15 - 20分钟）。然而，由于吸附剂表面积小，其吸附容量低，这意味着在该过程中需要循环大量的吸附剂来处理即使是小型印染厂产生的废水体积。因此，人们认为以这种模式运行该过程限制了这项技术的实际应用。
