Affiliation:
1. Chongqing University of Technology
2. Shanghai Jiaotong University: Shanghai Jiao Tong University
Abstract
Abstract
This study aimed to develop a multistage treatment system for highly toxic wastewater named reverse osmosis concentrates (ROC) of landfill leachate (LL). Therefore, a combination of the ammonia stripping process (ASP), catalytic ozone oxidation process (COP) and Heterotrophic Nitrification Aerobic Denitrification process (HNADP) was proposed and the quality of effluent was evaluated for the concentration of Chemical Oxygen Demand (COD), ammonia nitrogen (NH4+-N) and total nitrogen (TN). ASP had moderate removal efficiency of NH4+-N, and TN in the effluent. COP was catalyzed by cerium supported activated carbon (Ce-AC) achieved good performance in disposal of COD. The effluent of HNADP had the most significant removal efficiency of COD, NH4+-N, and TN. As a result, the effluent of combined process successfully met the discharge standards for NH4+-N and TN according to Table 2 of GB 16889-2008 in China. To investigate the microbial mechanism of pollutant removal in HNADP, 16S rRNA high-throughput sequencing was performed and the results suggested that the relative abundance and diversity of microorganisms fluctuated with the changes of COD/TN ratio(C/N) in HNADP. Truepera and Halomonas were identified as the key genera involved in the simultaneous degradation of COD and nitrogen-containing pollutants, the functional genes (hao, amoA, nirS and nirK) were predicted in nitrification and denitrification process. Overall, this study demonstrates a feasible multistage system for treatment of ROC and propose that further explorations of combined techniques may lead to even more satisfactory removal efficiencies.
Publisher
Research Square Platform LLC