Abstract
The present study evaluated the removal of TOC from an effluent with high organic load resulted from the treatment of oil-water emulsion by thermal process. Hollow Fiber Ultrafiltration membrane (HF-UF) and physicochemical clarification process were used as pretreatment options to assess the influence of feed effluent quality on the UV/H2O2 oxidation process. Results for TOC removals showed HF-UF and physicochemical clarification processes can significantly improve the efficiency of UV/H2O2 oxidation process, when compared with the direct effluent oxidation. Reaction time for obtaining a TOC removal higher than 90% was reduced to approximately half of the time needed when no pretreatment was applied. Considering both pretreatment processes it was not possible to notice any significant difference on the UV/H2O2 oxidation process performance. However, the complexity of physicochemical process due to the use of three different chemicals and sludge production made the HF-UF process the best pretreatment alternative, without increasing the Total Dissolved Solids of the effluent, a very important issue when water reuse is considered.
Highlights
The industrial development is one of main causes for environmental degradation of urbanized areas in Brazil, mainly of water bodies
Focusing the overall performance of a treatment system for industrial effluent treatment, the aim of this study was to evaluate the influence of two pretreatment technologies: (i) physicochemical clarification (ii) Hollow Fiber Ultrafiltration Membrane – on the performance of UV/H2O2 oxidation process for treating an industrial effluent with a high organic load
Pretreatment Performance As it was mentioned, two types of pretreatment were applied prior oxidation experiments were initiated: (i) physicochemical clarification using 3 different chemicals and (ii) Hollow Fiber Ultrafiltration Membrane with Molecular Weight Cut-off (MWCO) of 50,000 Da. Those pretreatments were studied in order to verify the effect of feed water quality on TOC kinetics removal by UV/H2O2 oxidation process, mainly with respect of turbidity and color removal which may prevent the penetration of UV light through wastewater during the oxidation experiments
Summary
The industrial development is one of main causes for environmental degradation of urbanized areas in Brazil, mainly of water bodies. Metal working fluids are used in many small companies for metal forming and machining process, like cutting, grinding, and milling, considering the complexity of the effluents produced, most of those companies has no capacity to treat it, they hire a specialized company to do this job. Companies that provide such kind of service collect effluents from many sources and them treat it by specific ways, charging their service according the volume processed. A complementary treatment step is necessary in order to cost-effectively meet environmental standards
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