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Remediation of trichloroethene (TCE)-contaminated groundwater by persulfate oxidation: a field-scale study

机译:过硫酸盐氧化修复三氯乙烯(TCE)污染的地下水:现场研究

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This study uses a trichloroethene (TCE)-contaminated site to determine the efficacy of persulfate oxidation for the treatment of TCE-contaminated groundwater. The main objectives of this study are: (1) to evaluate the efficacy of TCE treatment using persulfate with different injection strategies; (2) to determine the persistence of persulfate in the aquifer; (3) to determine the radius of influence (ROI) and transport distance of persulfate and (4) to determine the impact of persulfate on indigenous microorganisms during remediation. TCE concentrations are 0.26 mg L?1 in P143 and 0.361 mg L?1 in P146 and the microbial numbers are 6.1 × 103 CFU mL?1 in P143 and 4.4 × 104 CFU mL?1 in P146, before persulfate is injected. The results of the pilot study show that persulfate eliminates TCE. 100% of TCE is removed in P146 and 95% in P143. Single injection of a total amount of 275 kg of 5% persulfate produces better TCE removal than two half persulfate injections in sequence. The transport distance of persulfate ranges from 3.6 to 4.5 m. Persulfate also persists for 14 days in the aquifer. After persulfate is injected, the total bacterial counts decrease slightly to 2.4 × 103 CFU mL?1 in P143 and 1.8 × 103 CFU mL?1 in P146. When persulfate is consumed, the total bacterial counts increase but there is no recovery of the microbial community. The results show that sequential injections of a large amount of persulfate are suggested to maintain good long-term performance for TCE treatment.
机译:这项研究使用三氯乙烯(TCE)污染的站点来确定过硫酸盐氧化处理TCE污染的地下水的功效。这项研究的主要目的是:(1)评价过硫酸盐与不同注射策略对TCE治疗的疗效; (2)确定过硫酸盐在含水层中的持久性; (3)确定过硫酸盐的影响半径(ROI)和转运距离,以及(4)确定过硫酸盐在修复过程中对本地微生物的影响。 TCE浓度在P143中为0.26 mg L ?1 ,在P146中为0.361 mg L ?1 和微生物数在P143中为6.1×10 3 CFU mL ?1 和4.4×10 4注入过硫酸盐之前,在P146中 CFU mL ?1 。初步研究结果表明,过硫酸盐消除了传统文化表现形式。 P146中100%的TCE被去除,P143中95%的TCE被去除。一次注射总量为275 kg的5%过硫酸盐比顺序注射两次半过硫酸盐产生更好的TCE去除效果。过硫酸盐的运输距离为3.6至4.5 m。过硫酸盐在含水层中也持续存在14天。注射过硫酸盐后,P143中的细菌总数略降至2.4×10 3 CFU mL ?1 和P146中的1.8×10 3 CFU mL ?1 。当消耗过硫酸盐时,细菌总数增加,但微生物群落没有恢复。结果表明,建议连续注射大量过硫酸盐以维持TCE治疗的良好长期表现。

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