Sub/supercritical water oxidation of high concentration wastewater from tall oil rosin production base

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• 作者：Rongrong Miao ; Minli Wang ; Junjun Shen ; Ping Ning ; Junjie Gu ; Qingqing Guan ; Qiuling Chen and Xinsheng Chai
• 刊名：Environmental Progress & Sustainable Energy
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：35
• 期：4
• 页码：975-981
• 全文大小：321K
• ISSN：1944-7450

文摘

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 for SO42− ions removal, around 385 mg/L SO42− remained which inhibited the oxidation activity by reducing the concentration of hydroxyl radicals (•OH). Since the wastewater compounds were mainly cyclic organic materials, higher O₂ contents (stoichiometric ratio over 2.5) and temperatures (over 380°C) are favorable for TOC removal. With O₂ 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.