1.College of Environment and Public Health, Xiamen Huaxia University;2.Institute of Urban Environment, Chinese Academy of Sciences
The National Natural Science Foundation of China (41877058); The Strategic Priority Research Program of the Chinese Academy of Sciences (XDA23020502); Open Fund of Key Laboratory for Environmental Monitoring in Colleges and Universities of Fujian Province (HJJC1901).
This study investigated the contribution of anaerobic digestion (AD), oxidation pond (OP), fluidized bed (FB) and subsurface constructed wetland (CW) to the removals of traditional pollutants, antibiotics, antibiotic resistant bacteria (ARB) and pathogenic bacteria during swine wastewater treatment and phosphate recovery. For conventional pollutants, the removal efficiency of COD by AD reached up to 40.28%, whereas those of TP and NH4+-N by CW reached up to 53.33% and 67.74%, respectively. Additionally, the highest TP removal efficiency of (49.94%) was achieved by FB. For antibiotic adsorption and degradation, the removals of oxytetracycline (OTC) and ciprofloxacin (CIP) by AD, FB and CW ranged from 32.27%~63.77% and 40.44%~44.11% respectively, while the removals of sulfadimidine (SM2) by AD, OP and CW ranged from 18.10%~28.52%. For ARB elimination, the removals of all kinds of ARB by AD were higher than 50%. As the third cascade of treatment process, CW further reduced the amount of all kinds of ARB, whereas the amounts of Proteus mirabilis, Salmonella aertrycke and Shigella soonei rebounded to some extent. Microbial community analysis indicated that the advantage of constructed wetland in reducing the abundance of pathogenic bacteria was significant. This paper suggest that it is feasible to use the subsurface CW for further treatment of swine wastewater after FB.