title: Highly effective degradation of sodium dodecylbenzene sulphonate and synthetic greywater by Fenton-like reaction over zerovalent iron-based catalyst.
abstract: There is an increasing interest to recycle greywater for meeting non-portable water demand. However, linear alkylbenzene sulphonates (a form of anionic surfactants) that are commonly found in greywater are less biodegradable at moderate to high concentrations. A fenton-like system is a relatively economic advanced oxidation process that can potentially be used for surfactant degradation in greywater treatment. This study investigated the feasibility of zerovalent iron (ZVI)-mediated Fenton's oxidation of sodium dodecylbenzene sulphonate (SDBS) using Fe0/H2O2 and Fe2+/Fe0/H2O2 systems under a range of operating conditions. For the Fe0/H2O2 binary system, the initial pH value and Fe0 dosage played important roles in final degradation efficiency. For the Fe2+/Fe0/H2O2 ternary systems, a small amount of Fe2+ (0.5-1.7 mM) contributed a synergistic effect to promote iron recycling and SDBS degradation. Approximately, 90% of SDBS mineralization efficiency was accomplished within 15 min at a pH range from 3.0 to 6.5, using 18 mM Fe0 and 15 mM H2O2. However, the removal kinetics was rate-limited by Fe2+ dissolution from the ZVI surfaces. The Fenton-like process of the Fe2+/Fe0/H2O2 ternary system also presents a promising treatment method for synthetic greywater, in which 90% TOC removal was achieved within the first 10 min; 78% COD and 91% BOD5 were achieved after 120 min of reaction.
authors.affiliation: a Department of Civil and Environmental Engineering , Hong Kong Polytechnic University , Hung Hom, Kowloon, Hong Kong , People's Republic of China.
authors.forename: Shi-Ni
authors.initials: SN
authors.lastname: Zhu
authors.forename: Chao
authors.initials: C
authors.lastname: Wang
authors.forename: Alex C K
authors.initials: AC
authors.lastname: Yip
authors.forename: Daniel C W
authors.initials: DC
authors.lastname: Tsang
mesh_terms: D001557:Benzenesulfonates / Q000737:chemistry*; D057919:Biological Oxygen Demand Analysis; D002384:Catalysis; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D009930:Organic Chemicals / Q000302:isolation & purification*; D018508:Water Purification
chemical_list: D001557:Benzenesulfonates; C045076:Fenton's reagent; D009930:Organic Chemicals; C001114:dodecylbenzenesulfonic acid; D006861:Hydrogen Peroxide; D007501:Iron
keywords: Fenton-like oxidation; anionic surfactants; greywater treatment; zerovalent iron