Health & Environmental Research Online (HERO)


Print Feedback Export to File
4253313 
Journal Article 
Reclaimed water quality during simulated ozone-managed aquifer recharge hybrid 
Yoon, MinK; Amy, GL 
2015 
Yes 
Environmental Earth Sciences
ISSN: 1866-6280
EISSN: 1866-6299 
73 
12 
7795-7802 
WOS:000355142800012 
A synergistic hybrid of two treatment processes, managed aquifer recharge (MAR) combined with ozonation, was proposed for wastewater reclamation and water reuse applications. Batch reactor and soil-column experiments were performed to evaluate reclaimed water quality using various chemical and bacterial analyses. The ozone process was optimized at low ozone dose (0.5 mg O-3/mg DOC) based on the control of N-nitrosodimethylamine (< 5 ng L-1) and bromate (< 10 mu g L-1), and applied prior to (i.e., O-3-MAR) and after MAR (i.e., MAR-O-3). This work demonstrates that effluent organic matter (EfOM) and trace organic contaminants (TOrCs) are effectively removed during the hybrid process of MAR combined ozonation, compared to MAR only. Based on fluorescence excitation-emission matrices analyses, both MAR and ozonation reduce soluble microbial (protein-like) products while only ozonation contributes in reducing humic and fulvic substances. Even at low ozone dose of 0.5 mg O-3/mg DOC, the O-3-MAR hybrid significantly reduced UV absorbance by a parts per thousand yen2 m(-1), BDOC by a parts per thousand yen64 %, and total (I ) pound TOrC concentrations by a parts per thousand yen70 % in the effluent water quality. However, no significant improvement (< 10 %) in the removal of I 16 pound TOrC concentrations was observed for the increased ozone dose at 1.0 mg O-3/mg DOC during MAR combined ozonation processes. Overall, O-3-MAR was effective by 10-30 % in treating effluent water than MAR based on DOC, UV254 nm EfOM, TOrC and bacterial analyses. In addition, MAR-O-3 was better than O-3-MAR for the reduction of fluorescence (close MQ), TOrCs (a parts per thousand yen74 %) and total bacteria cell concentrations (> 3 log reduction). Therefore, implementing MAR prior to ozonation appears to remove the bio-amenable compounds that react rapidly with ozone, thereby reducing oxidant demand and treatment efficiency. 
Managed aquifer recharge; Ozone; Trace organic contaminants; Wastewater reclamation/reuse