Abstract
In this study, a synthetic nanocomposite ultrafiltration membrane (prepared by blending polyvinylidene fluoride (PVDF) and hydrophilic O-carboxymethyl chitosan modified Fe3O4 (OCMCS-Fe3O4) nanoparticle) was applied in a bioreactor to treat milk processing wastewater (MPW). Experiments were carried out with two independent operating variables, mixed liquor suspended solids (MLSS) and hydraulic retention time (HRT). The region of exploration for the variables was taken as the area enclosed by MLSS (6000–14,000mg/L) and HRT (8–44h) boundaries. Throughout the experiments, high COD removal efficiency (92–99%) was obtained. The MLSS had an increasing impact on the removal efficiency of nitrogen, total phosphorous (TP), and flux. HRT also showed an increasing effect on the removal efficiency of nitrogen and flux while had a reverse impact on the TP removal efficiency. The optimal membrane performance was compared to commercial microfiltration (MF) membrane and the results showed that the blended membrane with modified nanoparticles leads to a high flux ultrafiltration membrane comparable with microfiltration while remaining its separation properties as much as UF membrane.
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