DOES MG(OH)2 REACT WITH SODIUM HYDROXIDE?

     
Cheng Huang 1 ,Jia Lai 1 ,Xiuyun Sun 2 ,Jiansheng Li 3 ,Jinyou Shen 3 ,Weiqing Han 3 ,Lianjun Wang 4


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Affiliations

1 Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, Jiangsu Province, China. 2 Jiangsu Key Laboratory of Chemical Pollution Control và Resources Reuse, School of Environmental & Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu Province, China. Electronic address: sunxyun
njust.edu.cn. 3 Engineering Research Center for Chemical Pollution Control (Ministry of Education), School of Environmental và Biological Engineering, Nanjing University of Science và Technology, Nanjing 210094, Jiangsu Province, China. 4 Jiangsu Key Laboratory of Chemical Pollution Control và Resources Reuse, School of Environmental & Biological Engineering, Nanjing University of Science và Technology, Nanjing 210094, Jiangsu Province, China; Engineering Research Center for Chemical Pollution Control (Ministry of Education), School of Environmental & Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, Jiangsu Province, China.
Enhancing anaerobic digestion of waste activated sludge by the combined use of NaOH & Mg(OH)2: Performance evaluation and mechanism study


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Cheng Huang 1 ,Jia Lai 1 ,Xiuyun Sun 2 ,Jiansheng Li 3 ,Jinyou Shen 3 ,Weiqing Han 3 ,Lianjun Wang 4

Affiliations

1 Jiangsu Key Laboratory of Chemical Pollution Control & Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, Jiangsu Province, China. 2 Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental và Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, Jiangsu Province, China. Electronic address: sunxyun
njust.edu.cn. 3 Engineering Research Center for Chemical Pollution Control (Ministry of Education), School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu Province, China. 4 Jiangsu Key Laboratory of Chemical Pollution Control và Resources Reuse, School of Environmental & Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, Jiangsu Province, China; Engineering Research Center for Chemical Pollution Control (Ministry of Education), School of Environmental and Biological Engineering, Nanjing University of Science và Technology, Nanjing 210094, Jiangsu Province, China.


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In this study, the combination treatment of NaOH and Mg(OH)2 was applied khổng lồ anaerobic digestion of waste activated sludge (WAS) for simultaneously enhancement of volatile fatty acids (VFAs) production, nutrients removal và sludge dewaterability. The maximum VFAs production (461mg COD/g VSS) was obtained at the NaOH/Mg(OH)2 ratio of 75:25, which was much higher than that of the blank or sole NaOH. Moreover, nutrients removal and sludge dewaterability were improved by the combined using of NaOH & Mg(OH)2. Mechanism investigations revealed that the presence of Mg(OH)2 could maintain alkaline environment, which contributed lớn inhibit the activity of methanogens. Also, the bridging between Mg(2+) & extracellular polymeric substances (EPS) plays an important role in the solubilization and dewatering of sludge. High-throughput sequencing analysis demonstrated that the abundance of bacteria involved in sludge hydrolysis & VFAs accumulation was greatly enriched with the mixtures of NaOH và Mg(OH)2.


Keywords: Alkaline digestion; Dewaterability; Magnesium hydroxide; Nutrients removal; Volatile fatty acids; Waste activated sludge.