Development of a post-treatment system using a downflow hanging sponge reactor – an upflow anaerobic reactor for natural rubber processing wastewater treatment. Issue 11 (16th November 2022)

• Record Type: Journal Article
• Authors: Nguyen, Dung Hoang; Tran P., Thao; Tran, Duc Minh; Masashi, Hatamoto; Takashi, Yamaguchi; Nguyen, Huong Lan
• Is Part Of: Journal of environmental science and health. Volume 57:Issue 11(2022)
• Page Start: 977
• Page End: 986
• Publication Date: 2022-11-16
• Subjects: Nitrogen removal -- downflow hanging sponge reactor -- upflow anaerobic reactor -- low COD/TN ratio -- Acinetobacter; Environmental engineering -- Periodicals; Environmental sciences -- Periodicals; Ecology -- periodicals; Hazardous Substances -- periodicals; 628
• DOI: 10.1080/10934529.2022.2134682
• Languages: English
• ISSNs: 1093-4529

Abstract

Abstract: This study aimed to evaluate the nitrogen removal of a post-treatment system for natural rubber processing wastewater (NRPW) under low chemical oxygen demand to total nitrogen (COD/TN) ratios without any supplemental external carbon source. The system including a downflow hanging sponge (DHS) reactor and an upflow anaerobic reactor (UAR) was operated in two phases. In phase 1 (day 0–102), under a nitrogen loading rate (NLR) of 0.23 ± 0.06 kgN m −3 d −1 and COD/TN ratio of 0.63 ± 0.47, the DHS-UAR system removed 82.5 ± 11.8% and 83.9 ± 7.6% of TN and ammonium concentrations, respectively. In phase 2 (day 103–229), higher COD/TN ratio of 1.96 ± 0.28 was applied to remove increasing NLRs. At the highest NLR of 0.51 kgN m −3 d −1, the system achieved TN and ammonium removal efficiencies of 93.2% and 93.7%, respectively. Nitrogen profiles and the 16S rRNA high-throughput sequencing data suggested that ammonium, a major nitrogen compound in NRPW, was utilized by nitrifying and ammonium assimilation bacteria in DHS, then removed by heterotrophic denitrifying and anammox bacteria in the UAR. The predominance of Acinetobacter detected in both reactors suggested its essential role for the nitrogen conversion.