YAN Yan¹,WANG Mingyu², CHEN Jianping¹, LI Wei² , LIU Zhu¹, QU Cixiao²

（1.College of Mining, Liaoning Technical University, Liaoning Fuxin 123000, China;
2.College of Resources and Environment, University of Chinese Academy Of Sciences, Beijing 100049, China）

Abstract: This work is to investigate suitable remediation methods for 1,2- DCA (1,2-dichloroethane)contamination in groundwater at contaminated sites, by comparing among the chemical oxidation remediation technique, monitored natural attenuation technique, and their combination. Firstly, the lab experiments were completed using the two different oxidants (potassium ferrate and hydrogen peroxide) to investigate the 1,2- DCA chemical removal efficiency and the effect of the groundwater chemistry environment in the removal process. The experimental results show that both the potassium ferrate and hydrogen peroxide are effective for chemical remediation, and 1,2- DCA removal rate is over 95% after about 60 days. In removing period, the total plate count will fall sharply, and as time goes by and oxidants consumes, total plate counts arose to substantial rebound, this shows that after the chemical scavenging effect weakens, bioremediation could be recovered . Then by using the GMS numerical simulation analysis for the contaminated sites, the remediation efficiencies are evaluated that on three different measures including the in-situ chemical oxidation remediation technique, monitored natural attenuation technique, and their combination. The obtained investigation results are expected to bear implications in optimal design and implementation of remediation of groundwater organic contamination at contaminated sites.

Key words: 1,2- Dichloroethane; groundwater remediation of organic contamination; chemical oxidation remediation; monitored natural attenuation; numerical simulations; contaminated sites

EARTH AND ENVIRONMENT Vol.49, No.3, Tot No.341, 2021, Page 250-259