Removal of Aniline from Groundwater by an Electrochemical-Hydrodynamic Cyclic Coupling In-Well Bioreactor
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摘要: 为使含水层中苯胺污染的原位修复过程高效安全且不产生二次污染，提出了一种电化学-水动力循环下的井内生物反应器修复地下水中苯胺的方法.在水动力循环系统的驱动下，评价了苯胺在水动力循环系统的挥发情况并且通过电化学手段提供氧气，井内生物反应器提供修复载体，在砂槽模拟的含水层体系中开展井内生物反应器降解苯胺的修复实验，并对生长曲线及含水层中苯胺修复进行了模拟.289 h的修复使体系内苯胺平均浓度从298 mg/L降低到132 mg/L，去除率为56.5%.运行过程中，监测点苯胺平均浓度在48 h内去除速率为1.10 mg/（L·h），48~72 h内去除速率为0.85 mg/（L·h），72 h到289 h内苯胺去除速率维持在0.65 mg/（L·h），氧化降解逐步减弱.该过程符合Michaelis-Menten方程，反应速率为：-6.71×10-7/（15+t）2.该修复系统是基于地下水动力循环技术的改进，有望应用于有机污染地下水修复.Abstract: To ensure the efficient and safe in-situ remediation process of aniline contamination in aquifer without secondary pollution, a method for the remediation of aniline in groundwater by an in-well bioreactor under electrochemical and hydrodynamic cycle is proposed. Driven by the hydrodynamic circulation system, the volatilization of aniline in the hydrodynamic circulation system was evaluated and oxygen was provided by electrochemical means. The bioreactor in the well provided the repair carrier. The remediation experiment of aniline degradation by the bioreactor in the well was carried out in the aquifer system simulated by the sand tank. The growth curve and aniline restoration in aquifer were simulated. After 289 hours of repair, the average concentration of aniline in the system was reduced from 298 mg/L to 132 mg/L, and the removal rate was 56.5%. During operation, the removal rate of aniline was 1.10 mg/(L·h) in 48 h, 0.85 mg/(L·h) in 48-72 h, and 0.65 mg/(L·h) in 72 h to 289 h. Oxidative degradation was gradually weakened. The process conforms to the Michaelis-Menten equation, and the reaction rate is -6.71×10-7/(15+t)2. This system is based on the improvement of groundwater dynamic circulation technology, and is expected to be applied to organic groundwater remediation.
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图 2 不同浓度苯胺条件下微生物生长曲线及其拟合曲线
Fig. 2. Microbial growth curves and their fitting curves under different concentrations of aniline
图 4 砂槽体系中初始时刻载体不同部位的生物量分布情况
Fig. 4. Biomass distribution of different parts of the carrier at the initial time in the sand tank system
图 5 含水层监测点苯胺平均浓度和井筒中DO随时间的变化
Fig. 5. The average concentration of aniline in aquifer monitoring points and the change of DO in wellbore with time
图 6 含水层中砂槽内苯胺浓度分布变化图
Fig. 6. Distribution change of aniline concentration in sand tank in aquifer
a. t=0 h; b. t=120 h; c. t=196 h; d. t=289 h
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