Layanne Rodrigues da Silva , Thais Jaciane Rodrigues Araujo , Maria Tereza Sarmento da Fonseca , Newton Carlos Santos , Germano Elias Gomes , Josivanda Palmeira Gomes , Gilmar Trindade de Araujo , Ana Paula Trindade Rocha
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引用次数: 0
Abstract
Wastewater from milk processing and its derivatives is highly polluting due to its complex composition. Conventional treatments do not allow the treated effluent to be reused, so more effective processes such as advanced oxidation processes (AOPs) are required. This study evaluated the efficiency of the Photo-Fenton AOP followed by adsorption in activated carbon (AC) suspension to reduce the organic load of the effluent. The effluent was characterized for conductivity, pH, chemical oxygen demand (COD), total and soluble solids, and oils and fats. The initial COD of the effluent was 630 mg.O₂/L, and the total solids content was 3703 mg/L. The AC was characterized for mesoporosity, microporosity, zero-charge pH, and Boehm's acidic and basic groups. A central composite rotational design (CCRD) was used to determine different concentrations of H₂O₂ and FeSO₄ to prepare Fenton solutions and the reaction time for the AOP treatment, with COD reduction as the response variable. The Photo-Fenton treatment achieved a maximum COD reduction of 79 % under optimized conditions (0.829 mL/L of H₂O₂, 0.625 g/L of FeSO₄ for 60 min). After photooxidative treatment, the samples were suspended in AC and filtered. Kinetic and equilibrium studies showed that the AC could remove 1666.6 mg.O₂/g per gram of AC, confirming its effectiveness as an adsorbent after the Photo-Fenton process. With the coupled Photo-Fenton/adsorption treatment, the efficiency for organic removal reached 99 %, indicating strong and efficient reduction of organic compounds. These results suggest that the treated effluent could be suitable for reuse in various industrial applications, promoting sustainable water management practices.
期刊介绍：
The Journal of Water Process Engineering aims to publish refereed, high-quality research papers with significant novelty and impact in all areas of the engineering of water and wastewater processing . Papers on advanced and novel treatment processes and technologies are particularly welcome. The Journal considers papers in areas such as nanotechnology and biotechnology applications in water, novel oxidation and separation processes, membrane processes (except those for desalination) , catalytic processes for the removal of water contaminants, sustainable processes, water reuse and recycling, water use and wastewater minimization, integrated/hybrid technology, process modeling of water treatment and novel treatment processes. Submissions on the subject of adsorbents, including standard measurements of adsorption kinetics and equilibrium will only be considered if there is a genuine case for novelty and contribution, for example highly novel, sustainable adsorbents and their use: papers on activated carbon-type materials derived from natural matter, or surfactant-modified clays and related minerals, would not fulfil this criterion. The Journal particularly welcomes contributions involving environmentally, economically and socially sustainable technology for water treatment, including those which are energy-efficient, with minimal or no chemical consumption, and capable of water recycling and reuse that minimizes the direct disposal of wastewater to the aquatic environment. Papers that describe novel ideas for solving issues related to water quality and availability are also welcome, as are those that show the transfer of techniques from other disciplines. The Journal will consider papers dealing with processes for various water matrices including drinking water (except desalination), domestic, urban and industrial wastewaters, in addition to their residues. It is expected that the journal will be of particular relevance to chemical and process engineers working in the field. The Journal welcomes Full Text papers, Short Communications, State-of-the-Art Reviews and Letters to Editors and Case Studies
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