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Effect of organic matter on nitrogen removal through the anammox process
Author(s) -
Nguyen Hanh Thi My,
Tran Hoa Thi Hien
Publication year - 2021
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.1002/wer.1463
Subject(s) - anammox , chemistry , effluent , hydraulic retention time , chemical oxygen demand , ammonium , nitrogen , wastewater , denitrification , pulp and paper industry , environmental engineering , environmental chemistry , organic chemistry , environmental science , denitrifying bacteria , engineering
In the anaerobic ammonium oxidation (anammox) process, the anammox bacterial activity is inhibited by high chemical oxygen demand (COD) contents. In this study, the effect of the COD/total nitrogen (TN) ratio and hydraulic retention time (HRT) on the efficiency of the anammox process in a fixed‐bed reactor was assessed via experiments with increasing COD/TN ratios from 0 to 7.0 and different HRTs of 6, 9, and 12 hr. Felibendy cubes were used as the biomass carrier. The presence of organic compounds affects the performance of the treatment process, and the level of influence increases with the increase in influent COD. With COD greater than 300 mg/L, the anammox process was inhibited, TN efficiency was the lowest, and effluent water quality did not yield effluent standards. The kinetic parameters U max (the maximum substrate removal rate constant) and K B (the saturation constant) of the Stover–Kincannon model corresponding to the different COD/TN ratios were determined in this study. The kinetic parameter values of the ammonium removal process decreased gradually from U max = 0.685 g/L/day and K B = 0.846 g/L/day, for COD/TN = 0, to U max = 0.314 g/L/day and K B = 0.498 g/L/day, for COD/TN = 6. The kinetic parameter of the TN removal process also decreased gradually as the COD/TN ratio in wastewater increased gradually. This means that the anammox process was inhibited as much as high organic compounds. Practitioner points The higher COD/TN ratios the more anammox activity is affected, especially COD/TN = 7.0 (COD = 350 mg/L). The tolerance threshold of anammox process about organic matter concentration is 300 mg/L as COD (COD/TN ratio <6). With the COD/TN ratios from 1.0 to 6.0, the values of U max and K B constants of Stover‐Kincannon model for ammonium removal by Anammox process decrease gradually from 0.685 to 0.314 and from 0.846 to 0.498, respectively.