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Dang, Bao-Trong; Tran, Duyen P.H.; Nguyen, Ngoc-Kim-Qui; Cao, Huong T.N.; Tomoaki, Itayama; Huynh, Ky-Phuong-Ha; Pham, Tan-Thi; Varjani, Sunita; Hao Ngo, Huu; Wang, Ya-Fen; You, Sheng-Jie; Bui, Xuan-Thanh
Bioresource technology, 20/May , Letnik: 351Journal Article
Display omitted •Nitrification was successfully activated by salt tolerant bacteria (STB).•STB enhanced COD and TKN removal by 11% and 23%.•The produced NO2–-N and NO3–-N was co-fitted with the logistic function.•Free ammonia and high C/N ratio reduced the nitrite oxidation when using STB. Conventional biological treatment has been reported to be ineffective for pollutant removal in tannery wastewater due to high salinity. To overcome it, this work used salt-tolerant bacteria (STB) isolated from a membrane bioreactor to evaluate the organic and nutrient removal through a series of batch experiments. Compared with the control, the STB reactor enhanced the reduction of persistent organics by 11% based on the double exponential decay model. Besides, the removal of NH4+-N is 26% higher, satisfying the first-order decay model. The nitrification was inhibited entirely in control during 48 h, whilst the assimilation process involved 55% of total nitrogen removal. In the STB reactor, nitrification occurred after 12 h, resulting in significantly increased NO2–-N and NO3–-N concentrations according to the logistic function. Although nitrification was successfully activated, C/N ratios and free ammonia were identified as limiting factors for STB activity, requiring mitigation strategies in further studies.
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