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Removal of recalcitrant organic matter content in wastewater by means of AOPs aiming industrial water reuse.
Environ Sci Pollut Res Int. 2016 Nov; 23(22):22947-22956.ES

Abstract

This paper comes out from the need to provide an improvement in the current oil refinery wastewater treatment plant (WWTP) aiming to generate water for reuse. The wastewater was pretreated and collected in the WWTP after the biological treatment unit (bio-disks) followed by sand filtration. Ozonation (ozone concentration from 3.0-60 mgO3 L-1), UV (power lamp from 15 to 95 W), H2O2 (carbon:H2O2 molar ratio of 1:1, 1:2, and 1:4), and two advanced oxidation processes (UV/O3 and UV/H2O2) were investigated aiming to reduce the wastewater organic matter and generate water with suitable characteristics for the reverse osmosis operation and subsequent industrial reuse. Even after the biological and filtration treatments, the oil refinery wastewater still presented an appreciable amount of recalcitrant organic matter (TOC of 12-19 mgC L-1) and silt density index (SDI) higher than 4, which is considered high for subsequent reverse osmosis due to membrane fouling risks. Experiments using non combined processes (O3, H2O2, and UV only) showed a low degree of mineralization after 60 min of reaction, although the pretreatment with ozone had promoted the oxidation of aromatic compounds originally found in the real matrix, which suggests the formation of recalcitrant compounds. When the combined processes were applied, a considerable increase in the TOC removal was observed (max of 95 % for UV/O3 process, 55 W, 60 mgO3 L-1), likely due the presence of higher amounts of reactive species, specially hydroxyl radicals, confirming the important role of these species on the photochemical degradation of the wastewater compounds. A zero-order kinetic model was fitted to the experimental data and the rate constant values (k, mgC L-1 h-1) ranged from 4.8 < k UV/O3 < 11 ([O3]0 = 30-60 mg L-1), and 8.6 < k UV/H2O2 < 11 (C:H2O2 from 1:1 to 1:4). The minimum and maximum electrical energy per order (E EO) required for 60 min of treatment were calculated as 5.4 and 81 Wh L-1, respectively, for UV/O3 (15 W, 60 mgO3 L-1) and UV/H2O2 (95 W, 1C:1H2O2). Good results in terms of water conditioning for reverse osmosis operation were obtained using UV/H2O2 process with initial molar ratio of 1 C:2 H2O2 (UV lamp 55 W) and 1 C:4 H2O2 (UV lamp 95 W), and total organic carbon (TOC) removals of 62 % (SDI15 = 1.8) and 74 % (SDI15 = 2.0) were achieved, respectively, after 60 min. The treated wastewater followed to the reverse osmosis system, which operated with an adequate flux of permeate, was very efficient to remove salt and generate a permeate water with the required quality for industrial reuse.

Authors+Show Affiliations

Chemical Engineering Program, COPPE, Federal University of Rio de Janeiro, P.O. Box 68502, Rio de Janeiro, RJ, 21945-970, Brazil.Chemical Engineering Program, COPPE, Federal University of Rio de Janeiro, P.O. Box 68502, Rio de Janeiro, RJ, 21945-970, Brazil.Chemical Engineering Program, COPPE, Federal University of Rio de Janeiro, P.O. Box 68502, Rio de Janeiro, RJ, 21945-970, Brazil.Chemical Engineering Program, COPPE, Federal University of Rio de Janeiro, P.O. Box 68502, Rio de Janeiro, RJ, 21945-970, Brazil.Petrobras, Cenpes, Av. Horacio Macedo 950, Rio de Janeiro, RJ, 21941-915, Brazil.Chemical Engineering Program, COPPE, Federal University of Rio de Janeiro, P.O. Box 68502, Rio de Janeiro, RJ, 21945-970, Brazil.Chemical Engineering Program, COPPE, Federal University of Rio de Janeiro, P.O. Box 68502, Rio de Janeiro, RJ, 21945-970, Brazil. mdezotti@peq.coppe.ufrj.br.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27578092

Citation

Souza, Bianca M., et al. "Removal of Recalcitrant Organic Matter Content in Wastewater By Means of AOPs Aiming Industrial Water Reuse." Environmental Science and Pollution Research International, vol. 23, no. 22, 2016, pp. 22947-22956.
Souza BM, Souza BS, Guimarães TM, et al. Removal of recalcitrant organic matter content in wastewater by means of AOPs aiming industrial water reuse. Environ Sci Pollut Res Int. 2016;23(22):22947-22956.
Souza, B. M., Souza, B. S., Guimarães, T. M., Ribeiro, T. F., Cerqueira, A. C., Sant'Anna, G. L., & Dezotti, M. (2016). Removal of recalcitrant organic matter content in wastewater by means of AOPs aiming industrial water reuse. Environmental Science and Pollution Research International, 23(22), 22947-22956.
Souza BM, et al. Removal of Recalcitrant Organic Matter Content in Wastewater By Means of AOPs Aiming Industrial Water Reuse. Environ Sci Pollut Res Int. 2016;23(22):22947-22956. PubMed PMID: 27578092.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Removal of recalcitrant organic matter content in wastewater by means of AOPs aiming industrial water reuse. AU - Souza,Bianca M, AU - Souza,Bruno S, AU - Guimarães,Tarsila M, AU - Ribeiro,Thiago F S, AU - Cerqueira,Ana C, AU - Sant'Anna,Geraldo L,Jr AU - Dezotti,Márcia, Y1 - 2016/08/30/ PY - 2016/04/14/received PY - 2016/08/15/accepted PY - 2016/9/1/pubmed PY - 2017/4/28/medline PY - 2016/9/1/entrez KW - AOPs KW - Oil refinery wastewater KW - Reverse osmosis KW - Water reuse SP - 22947 EP - 22956 JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int VL - 23 IS - 22 N2 - This paper comes out from the need to provide an improvement in the current oil refinery wastewater treatment plant (WWTP) aiming to generate water for reuse. The wastewater was pretreated and collected in the WWTP after the biological treatment unit (bio-disks) followed by sand filtration. Ozonation (ozone concentration from 3.0-60 mgO3 L-1), UV (power lamp from 15 to 95 W), H2O2 (carbon:H2O2 molar ratio of 1:1, 1:2, and 1:4), and two advanced oxidation processes (UV/O3 and UV/H2O2) were investigated aiming to reduce the wastewater organic matter and generate water with suitable characteristics for the reverse osmosis operation and subsequent industrial reuse. Even after the biological and filtration treatments, the oil refinery wastewater still presented an appreciable amount of recalcitrant organic matter (TOC of 12-19 mgC L-1) and silt density index (SDI) higher than 4, which is considered high for subsequent reverse osmosis due to membrane fouling risks. Experiments using non combined processes (O3, H2O2, and UV only) showed a low degree of mineralization after 60 min of reaction, although the pretreatment with ozone had promoted the oxidation of aromatic compounds originally found in the real matrix, which suggests the formation of recalcitrant compounds. When the combined processes were applied, a considerable increase in the TOC removal was observed (max of 95 % for UV/O3 process, 55 W, 60 mgO3 L-1), likely due the presence of higher amounts of reactive species, specially hydroxyl radicals, confirming the important role of these species on the photochemical degradation of the wastewater compounds. A zero-order kinetic model was fitted to the experimental data and the rate constant values (k, mgC L-1 h-1) ranged from 4.8 < k UV/O3 < 11 ([O3]0 = 30-60 mg L-1), and 8.6 < k UV/H2O2 < 11 (C:H2O2 from 1:1 to 1:4). The minimum and maximum electrical energy per order (E EO) required for 60 min of treatment were calculated as 5.4 and 81 Wh L-1, respectively, for UV/O3 (15 W, 60 mgO3 L-1) and UV/H2O2 (95 W, 1C:1H2O2). Good results in terms of water conditioning for reverse osmosis operation were obtained using UV/H2O2 process with initial molar ratio of 1 C:2 H2O2 (UV lamp 55 W) and 1 C:4 H2O2 (UV lamp 95 W), and total organic carbon (TOC) removals of 62 % (SDI15 = 1.8) and 74 % (SDI15 = 2.0) were achieved, respectively, after 60 min. The treated wastewater followed to the reverse osmosis system, which operated with an adequate flux of permeate, was very efficient to remove salt and generate a permeate water with the required quality for industrial reuse. SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/27578092/Removal_of_recalcitrant_organic_matter_content_in_wastewater_by_means_of_AOPs_aiming_industrial_water_reuse_ L2 - https://dx.doi.org/10.1007/s11356-016-7476-5 DB - PRIME DP - Unbound Medicine ER -