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      Dewatering of drilling sludge by ultrasound assisted Fe(ii)-activated persulfate oxidation

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      RSC Advances
      The Royal Society of Chemistry

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          Abstract

          An ultrasound assisted Fe( ii)-activated persulfate oxidation method was put forward to improve the dewaterability of drilling sludge in this research. The water content in the filter cake and specific resistance to filtration (SRF) were measured to evaluate the sludge dewaterability. Volatile suspended solids (VSS), transmittance of supernatant, microstructure, particle size distribution and zeta potential were tested to justify the proposed mechanism. The results showed that appropriate ultrasound assisted Fe( ii)-activated persulfate oxidation could not only further enhance the sludge dewaterability but also reduce the reaction time as well. The optimal conditions for this method were 1.6% sodium persulfate, 0.8% ferrous sulfate, 40 W ultrasonic power and 45 min reaction time. Reduction of VSS and an increase of transmittance were further achieved compared to oxidation alone. SEM results and the decrease of particle size after the treatment confirmed the disintegration of sludge flocs, which promoted the release of bound water. A synergistic effect mechanism of ultrasound and chemical oxidation was proposed, with ultrasonic cavitation disintegrating the flocs, exposing the interior organics and persulfate further oxidizing the released organics.

          Abstract

          An ultrasound assisted Fe( ii)-activated persulfate oxidation method was put forward to improve the dewaterability of drilling sludge in this research.

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          Most cited references44

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          A review of classic Fenton's peroxidation as an advanced oxidation technique.

          Hydrogen peroxide (H(2)O(2)) is a strong oxidant and its application in the treatment of various inorganic and organic pollutants is well established. Still H(2)O(2) alone is not effective for high concentrations of certain refractory contaminants because of low rates of reaction at reasonable H(2)O(2) concentrations. Improvements can be achieved by using transition metal salts (e.g. iron salts) or ozone and UV-light can activate H(2)O(2) to form hydroxyl radicals, which are strong oxidants. Oxidation processes utilising activation of H(2)O(2) by iron salts, classically referred to as Fenton's reagent is known to be very effective in the destruction of many hazardous organic pollutants in water. The first part of our paper presents a literature review of the various Fenton reagent reactions which constitute the overall kinetic scheme with all possible side reactions. It also summarises previous publications on the relationships between the dominant parameters (e.g. [H(2)O(2)], [Fe(2+)], . . .). The second part of our review discusses the possibility of improving sludge dewaterability using Fenton's reagent. Copyright 2003 Elsevier Science B.V.
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            Ultrasound enhanced heterogeneous activation of peroxymonosulfate by a bimetallic Fe-Co/SBA-15 catalyst for the degradation of Orange II in water.

            Mesoporous silica SBA-15 supported iron and cobalt (Fe-Co/SBA-15) was prepared and used as catalyst in the ultrasound (US) enhanced heterogeneous activation of peroxymonosulfate (PMS, HSO5(-)) process. The effects of some important reaction parameters on the removal of Orange II by US/Fe-Co/SBA-15/PMS process were investigated. The results indicated that the removal rate of Orange II was not significantly affected by the initial pH, and it increased with the higher PMS concentration, reaction temperature, Fe-Co/SBA-15 dosage and ultrasonic power. Furthermore, sulfate radicals (SO4(-)) were assumed to be the dominating reactive species for the Orange II decolorization. Moreover, the Fe-Co/SBA-15 catalyst showed high activity during the repeated experiments. The intermediate products were identified by GC-MS, thereby a plausible degradation pathway is proposed. In addition, the chemical oxygen demand (COD) removal efficiencies at 2 and 24h were 56.8% and 80.1%, respectively and the corresponding total organic carbon (TOC) removal efficiencies were 33.8 and 53.3%. Finally, toxicity tests with activated sludge showed that the toxicity of the solution increased during the first stage and then decreased significantly with the progress of the oxidation.
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              A parametric review of sonochemistry: Control and augmentation of sonochemical activity in aqueous solutions

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                Author and article information

                Journal
                RSC Adv
                RSC Adv
                RA
                RSCACL
                RSC Advances
                The Royal Society of Chemistry
                2046-2069
                23 August 2018
                20 August 2018
                23 August 2018
                : 8
                : 52
                : 29756-29766
                Affiliations
                [a] School of Chemical Engineering and Technology, Tianjin University Tianjin 300350 China zhuguorui@ 123456tju.edu.cn +862227408728 +862227408728
                Author notes
                [†]

                Mail address: 135 Yaguan Rd, Haihe Educational Park, Tianjin 300350, China.

                Author information
                https://orcid.org/0000-0003-1941-1689
                https://orcid.org/0000-0003-4961-6298
                Article
                c8ra03376e
                10.1039/c8ra03376e
                9085257
                35547326
                aad3a534-52a5-451c-a15b-a856f76b89ef
                This journal is © The Royal Society of Chemistry
                History
                : 19 April 2018
                : 15 August 2018
                Page count
                Pages: 11
                Funding
                Funded by: National Natural Science Foundation of China, doi 10.13039/501100001809;
                Award ID: 21606164
                Categories
                Chemistry
                Custom metadata
                Paginated Article

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