Heavy metal pollution of civil and industrial wastewaters represents a major problem for the environment since metal ions are non-biodegradable, have a very high toxicity, and some of them have proved to be carcinogenic. If directly discharged in sewers, metal ions may seri-ously damage the subsequent biological treatments in depuration plants and render treat-ment sludge not reusable for agriculture. On the contrary, water and sludge reuse should be a primary criterion when planning improvements for wastewater treatment plants and their adaptation to new standards. In this paper, the membrane performance (a monotubular cera-mic membrane of molecular weight cutoff: 210 kDa) is investigated in the removal of nickel and cobalt ions from synthetic liquid wastes aimed at water reuse using a micellar-enhanced ultrafiltration process. The ultrafiltration membrane is used with adding an anionic surfac-tant (sodium dodecyl sulfate (SDS)) in a laboratory scale experimental device. The synthetic liquid waste contains metal ions in a concentration range 10–100 mg/L, and the SDS concen-tration was 1.15 mg/L, under the critical micellar concentration (CMC). The experiments have been carried out at a fixed temperature of 20˚C. The preliminary results show that very good percentage removals of these metal ions are achieved, even if the surfactant was below its CMC.
|Titolo:||Analysis of membrane performance in Ni and Co removal from liquid wastes by means of micellar-enhanced ultrafiltration|
|Data di pubblicazione:||2016|
|Appare nelle tipologie:||1.1 Articolo in rivista|