Influence of C/N ratios on treatment performance and biomass production during co-culture of microalgae and activated sludge.

Autor: Dang BT; HUTECH University, 475A Dien Bien Phu, Ward 25, Binh Thanh District, Ho Chi Minh City, Viet Nam., Nguyen TT; School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea., Ngo HH; School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NWS 2007, Australia., Pham MD; Key Laboratory of Advanced Waste Treatment Technology, Ho Chi Minh City University of Technology (HCMUT), Vietnam National University Ho Chi Minh (VNU-HCM), Thu Duc city, Ho Chi Minh City 700000, Viet Nam; Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, district 10, Ho Chi Minh City 700000, Viet Nam.. Electronic address: pmdthong@hcmut.edu.vn., Le LT; Faculty of Public Health, University of Medicine and Pharmacy at Ho Chi Minh City (UMP), ward 11, district 5, Ho Chi Minh City, Viet Nam., Nguyen NK; Key Laboratory of Advanced Waste Treatment Technology, Ho Chi Minh City University of Technology (HCMUT), Vietnam National University Ho Chi Minh (VNU-HCM), Thu Duc city, Ho Chi Minh City 700000, Viet Nam; Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, district 10, Ho Chi Minh City 700000, Viet Nam., Vo TD; Faculty of Environmental and Food Engineering, Nguyen Tat Thanh University, Ho Chi Minh City, Viet Nam., Varjani S; Gujarat Pollution Control Board, Gandhinagar, Gujarat 382 010, India., You SJ; Department of Environmental Engineering, Center for Environmental Risk Management, Chung Yuan Christian University, Taoyuan 32023, Taiwan., Lin KA; Department of Environmental Engineering, National Chung Hsing University, No. 250 Kuo-Kuang Road, Taichung 402, Taiwan., Huynh KP; Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, district 10, Ho Chi Minh City 700000, Viet Nam; Key Laboratory of Advanced Waste Treatment Technology, Ho Chi Minh City University of Technology (HCMUT), Vietnam National University Ho Chi Minh (VNU-HCM), Thu Duc city, Ho Chi Minh City 700000, Viet Nam., Bui XT; Key Laboratory of Advanced Waste Treatment Technology, Ho Chi Minh City University of Technology (HCMUT), Vietnam National University Ho Chi Minh (VNU-HCM), Thu Duc city, Ho Chi Minh City 700000, Viet Nam; Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, district 10, Ho Chi Minh City 700000, Viet Nam.. Electronic address: bxthanh@hcmut.edu.vn.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2022 Sep 01; Vol. 837, pp. 155832. Date of Electronic Publication: 2022 May 10.
DOI: 10.1016/j.scitotenv.2022.155832
Abstrakt: Novel phycosphere associated bacteria processes are being regarded as a potential and cost-effective strategy for controlling anthropogenic contaminants in wastewater treatment. However, the underlying concern with the process is its vulnerability to improper organic or nutrient intake. This study established a synergistic interaction between microalgae and activated sludge in a three-photobioreactor system (without external aeration) to understand how pollutants could be mitigated whilst simultaneously yielding biomass under different C/N ratios of 1:1, 5:1 and 10:1. The result showed that the superior biomass productivity was facilitated at a C/N ratio of 5:1 (106 mg L -1 d -1 ), and the high degradation rate constants (k COD = 0.25 d -1 , k TN = 0.29 d -1 , k TP = 0.35 d -1 ) was approximated using a first-order kinetic model. The removal of pollutants was remarkably high, exceeding 90% (COD), 93% (TN), and 96% (TP). Nevertheless, the C/N ratio of 1:1 resulted in a threefold drop in biomass-specific growth rate (μ = 0.07 d -1 ). Microalgal assimilation, followed by bacterial denitrification, is the major pathway of removing total nitrogen when the C/N ratio exceeds 5:1. Activated sludge plays an important role in improving microalgae tolerance to high concentration of ammonia nitrogen and boosting nitrification (light phase) and denitrification (dark phase). The use of phycosphere associated bacteria could be a promising strategy for controlling nutrients pollution and other environmental considerations in wastewater.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2022 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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