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Sub/supercritical water oxidation of high concentration wastewater from tall oil rosin production base
Author(s) -
Miao Rongrong,
Wang Minli,
Shen Junjun,
Ning Ping,
Gu Junjie,
Guan Qingqing,
Chen Qiuling,
Chai Xinsheng
Publication year - 2016
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.12303
Subject(s) - supercritical water oxidation , supercritical fluid , wastewater , rosin , chemistry , base (topology) , stoichiometry , nuclear chemistry , extraction (chemistry) , environmental chemistry , environmental engineering , organic chemistry , environmental science , resin acid , mathematical analysis , mathematics
The sub/supercritical water oxidation (SCWO) of wastewater with high concentrations of pollutants from tall oil rosin production base was studied under the temperature range of 320°C–420°C and the pressure range of 11–25 MPa. The results showed that after pretreatment with Ca(OH) 2 forSO 4 2 −ions removal, around 385 mg/LSO 4 2 −remained which inhibited the oxidation activity by reducing the concentration of hydroxyl radicals (•OH). Since the wastewater compounds were mainly cyclic organic materials, higher O 2 contents (stoichiometric ratio over 2.5) and temperatures (over 380°C) are favorable for TOC removal. With O 2 SR = 2.5 and T = 420°C, the TOC removal reached almost 100% (99.89%) in 30 min. A global kinetic model for TOC removal during SCWO treatment was built during the research. The kinetic data acquired through the model were fitted to a power‐law function, and the data correlated well with the experimental data. © 2016 American Institute of Chemical Engineers Environ Prog, 35: 975–981, 2016