Electro-bioremediation of a mixture of structurally different contaminants of emerging concern: Uncovering electrokinetic contribution

JOURNAL OF HAZARDOUS MATERIALS

卷:406

Article

Guedes, Paula^1,2  Dionisio, Joana¹  Couto, Nazare¹  Mateus, Eduardo P.¹  Pereira, Cristina Silva²  Ribeiro, Alexandra B.¹ 

[1] NOVA Univ Lisbon, NOVA Sch Sci & Technol, Dept Environm Sci & Engn, CENSE Ctr Environm & Sustainabil Res, P-2829516 Caparica, Portugal

[2] Univ Nova Lisboa, Inst Tecnol Quim & Biol Antonio Xavier, Ave Republ, P-2780157 Oeiras, Portugal

关键词: Electrokinetic remediation;    Microbiota;    Abiotic removal;    Clay soil;    Pharmaceuticals and personal care products;   

DOI  :  10.1016/j.jhazmat.2020.124304

来源: Elsevier

【 摘 要 】

This study analyses the electrokinetic (EK) contribution to the removal from a clay soil of a mixture of 10 different contaminants of emerging concern (CECs; 17 beta-estradiol, E2; sulfamethoxazole, SMX; bisphenol A, BPA; ibuprofen, IBU; 17 alpha-ethinylestradiol, EE2; oxybenzone, OXY; diclofenac, DCF; triclosan, TCS; caffeine, CAF; carbamazepine, CBZ). After 4 days, the CECs natural attenuation was between 0% (CBZ) and 90% (E2) yet increasing with the application of EK (20 mA, 12 h ON/OFF) to 14% (CBZ) and 100% (E2). When EK was applied, the CECs more recalcitrant to biodegradation (i.e. <= 13% biotic decay) mostly underwent electrochemical induced degradation (OXY, DCF, TCS, CAF, CBZ). Daily irrigation enhanced the rates of the electrooxidation -osmosis and -migration, increasing the CECs decay. After 8 days of EK treatment, the CECs decay increased, surpassing the decay lag phase of some compounds (OXY, TCS, and CBZ). Yet after 16 days, most CECs showed similar removals with and without EK, with EK only acting positively on SMX, OXY, TCS and CBZ (ca. +10%). Our results support that EK application can improve the removal of CECs from soil, however, under the conditions tested, 16-day treatment lead to pH alterations that decreased the bioremediation efficiency and inhibited electro-degradation near the cathode.

【 授权许可】

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