过硫酸盐
化学
水溶液
双水相体系
无机化学
铁质
核化学
作者
Liming Liu,Yunbo Zhai,Xiangmin Liu,Xiaoping Liu,Zhexian Wang,Yun Zhu,Min Xu
标识
DOI:10.1016/j.jclepro.2022.132831
摘要
Fe (Ⅱ)/persulfate-based system is promising in the sewage sludge hydrothermal carbonization aqueous phase (HTC-AP) treatment. In this study, the 35.0% removal of dissolved organic carbon (DOC) and 42.0% removal of UV 254 absorbance were achieved in Fe (Ⅱ)/persulfate-based system via oxidization and coagulation. Different organic components exhibit dissimilar oxidation and coagulation behaviors. The UV 254 absorbance (account for 66.9%) and fluorescent components (account for 61.4%) were mainly removed by coagulation in HTC-AP220 at Fe (Ⅱ)/PS dosage of 20/20 mM, while the contribution of oxidation to the removal of DOC (account for 52.3%) was similar to the coagulation. The N-heterocyclic compounds, protein-like substances, and amide group in HTC-AP preferentially underwent oxidization via carbonylation , carboxylation , and oxidative remodeling, while the arene, humic-like substances, benzene ring , and carboxylate were primarily removed by coagulation via π-interactions and Fe–O bond. Noteworthily, moderate doses of persulfate (molar mass ratio of Fe (Ⅱ)/persulfate <1:1) promoted the coagulation to remove organics, while higher concentrations promoted the oxidation process. Besides, the FeO(OH) was formed after C–O binding in sediments, and aliphatic hydrocarbons were refractory organic matter in the HTC-AP. Insights into the selective effect of oxidation and coagulation in Fe (Ⅱ)/persulfate-based system are essential for the efficient application of the system. • The aromatic substances were mainly removed by the coagulation. • The amide and protein-like component were preferentially oxidized. • The arene and humic-like substances could be initially coagulated. • The amide bonds attacked firstly, followed by the aromatic groups. • The aromatic groups and carboxylate were preferentially bound with sediments.
科研通智能强力驱动
Strongly Powered by AbleSci AI