This study designed an integration of anaerobic digestion, partial nitrification/Anammox (PN/A), and Fenton process to efficiently treat high-concentration organic liquor wastewater (HCLW). Results indicated that when the diluted ten-fold mixture of boiler bottom water and cellar bottom water with the ratio of 5: 1 was used as influent, the average concentrations of COD, TN, NH4+-N, NO2−-N, and NO3−-N in effluent of biological treatment for this process were 180. 00, 12. 64, 1. 74, 0. 13, and 2. 45 mg/L, respectively. To meet the requirement for direct discharge of HCLW, Fenton oxidation with 600 mg H2O2/L and 300 mg Fe2+/L was used to further reduce the COD concentration. Three-dimensional fluorescence spectra analysis revealed that the process effectively altered the organic molecular structure and degraded some large molecular proteins. Microbial community analysis showed that Methanobacterium (20. 98% → 31. 52%) and Methanosaeta (9. 70% → 19. 34%) in AD, Azoarcus (no detected → 10. 49%) and Nitrosomonas (1. 68% → 6. 16%) in PN, and CandidatusBrocadia (18. 80% → 20. 31%) and Ignavibacterium (no detected → 5. 11%) in Anammox were dominant in this system. This study provided a pioneering industrial solution for the efficient and stable treatment of HCLW.
Zhang et al. (Wed,) studied this question.