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Experimental and CFD simulation study on anaerobic digestion using dextran pharmaceutical wastewater based on cyclic fluidization hydraulic mixing
Author(s) -
Xu Langui,
Yang Luqian,
Guo Shurui,
Zhou Jiawei,
Luo Tao,
Ran Yi,
Li Jiang,
Long Enshen,
Mei Zili,
Huang Ruyi
Publication year - 2021
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.13656
Subject(s) - wastewater , mixing (physics) , computational fluid dynamics , hydraulic retention time , port (circuit theory) , biogas , waste management , anaerobic digestion , environmental science , environmental engineering , engineering , chemistry , mechanical engineering , physics , organic chemistry , quantum mechanics , methane , aerospace engineering
Pharmaceutical wastewater is a kind of high‐hazardous waste. To realize non‐waste production, experiment and computational fluid dynamics (CFD) simulation were performed to reveal the hydraulic mechanism of mixing modes. Three digesters, numbered 0# (no‐port), 1# (one‐port), and 4# (four‐port), were conducted by dextran pharmaceutical wastewater. Digester 0# is the control group without mixing. Mixing mode of bottom inlet and high‐position outlet is employed to 1# and 4#, the outlets of 1# and 4# are centralized outlet with only one port and distributed outlets with four ports, respectively. Experiment result shows the daily biogas production of 1# and 4# are 45% and 58% higher than 0#, and the pollutants removal rate increased 20% and 24%, respectively. CFD simulation shows the second phase (dextran wastewater) of 4# failing to form a complete hydraulic path like the first phase (water), which explain the mixing modes can greatly improve the biogas yield, but the four‐port mode has a weaker advantage than the one‐port.