EFFECTS OF ETHANOL ON REMOVAL OF BTEX FROM GASOLINE BY PERSULFATE IN LIMESTONE AQUEOUS MEDIA

ZOU Zhikun; CHEN Yudao; ZHENG Gao; LU Renqian; YANG Pengfei; WU Weizhong

doi:10.13205/j.hjgc.202212013

Volume 40 Issue 12

Nov. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(12): 98-104

ZOU Zhikun, CHEN Yudao, ZHENG Gao, LU Renqian, YANG Pengfei, WU Weizhong. EFFECTS OF ETHANOL ON REMOVAL OF BTEX FROM GASOLINE BY PERSULFATE IN LIMESTONE AQUEOUS MEDIA[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(12): 98-104. doi: 10.13205/j.hjgc.202212013

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ZOU Zhikun, CHEN Yudao, ZHENG Gao, LU Renqian, YANG Pengfei, WU Weizhong. EFFECTS OF ETHANOL ON REMOVAL OF BTEX FROM GASOLINE BY PERSULFATE IN LIMESTONE AQUEOUS MEDIA[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(12): 98-104. doi: 10.13205/j.hjgc.202212013

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EFFECTS OF ETHANOL ON REMOVAL OF BTEX FROM GASOLINE BY PERSULFATE IN LIMESTONE AQUEOUS MEDIA

doi: 10.13205/j.hjgc.202212013

1. Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area, Guilin University of Technology, Guilin 541004, China;
2. Technical Innovation Center of Mine Geological Environmental Restoration Engineering in Southern Karst Area, Nanning 530031, China

Received Date: 2021-11-29
Available Online: 2023-03-23

Abstract

Abstract

With the increasing application of ethanol gasoline, the contaminated karst groundwater by its release has been concerned. Benzene, toluene, ethylbenzene, and xylene (referred to as BTEX) in gasoline can be effectively removed by in situ chemical oxidation using persulfate (PS). However, it’s still not clear whether the presence of ethanol affects the removal of BTEX by PS. In this paper, limestone particles, acting as the aqueous media, and gasoline BTEX (20 mg/L) combined with ethanol (500 mg/L or 5000 mg/L), acting as the pollutants, were used to form microcosms and simulate a contaminated karst groundwater environment. BTEX and ethanol removal effects by PS chemical oxidation were studied respectively, as well as their removal effects in coexistence. The results showed that 91% of BTEX was removed by PS in the first 28 days, with the first-order rate constants ranging from 0.006 to 0.349 d^-1. Benzene was the most difficult to remove, followed by toluene. Ethanol was removed by PS with the pseudo-first-order rate constants ranging from 0.003 to 0.054 d^-1, which was less than that of BTEX. The presence of ethanol could decrease the removal rate of BTEX, but couldn’t affect the removal priority of BTEX. The increase of PS concentration was beneficial to the removal of ethanol and BTEX, nevertheless, which could inhibit microbial activity, make the pH value drop more, and cause calcium sulfate precipitation. This work provides scientific data for in situ chemical oxidation of karst groundwater contaminated by ethanol gasoline.
- aromatics,
- persulfate,
- in-situ chemical oxidation,
- ethanol gasoline,
- karst groundwater

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References(36)

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