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.

Chemical simulation of greywater

“…Their greatest cleaning application is as filler in powdered home laundry detergents [43,44]. Sodium hydrogen carbonate, sodium dodecyl sulphate and sodium phosphate are important in the manufacture of textiles by reducing negative charges on fibres, so that dyes can penetrate evenly [45].…”

Domestic greywater treatment using electrocoagulation-electrooxidation process: optimisation and experimental approaches

“…To limit the risk of human contact, GW reuse for agriculture activities requires advanced treatment. Several advanced oxidation processes, such as Fenton oxidation 12 , persulfate oxidation 13 , photocatalysis 14 , photooxidation 15 , photo-Fenton 16 , and ozonation 17 , 18 , have been studied for this purpose.…”

Highly-efficient degradation of ensulizole using monopersulfate activated by nanostructured cobalt oxide: A comparative study on effects of different nanostructures

“…Therefore, SO4 •− -involved AOPs shall be promising and useful for eliminating Ensulizole. For obtaining SO4 •− , monopersulfate (MPS) represents the most common reagent because MPS is commercially available, easily accessible, environmentally benign and inexpensive [13][14][15][16]. However, generation of SO4 •− from MPS itself is sluggish and inefficient; thus, MPS must be activated to quickly decompose MPS into SO4 •− .…”