title: Characteristics of self-alkalization in high-rate denitrifying automatic circulation (DAC) reactor fed with methanol and sodium acetate.
abstract: Denitrification is a self-alkalization process. In this experiment, the characteristics of self-alkalization in high-rate heterotrophic denitrifying automatic circulation (DAC) reactor fed with methanol and sodium acetate were investigated, respectively. The results showed that, (1) The self-alkalization of high-rate denitrifying reactors was remarkably strong both with methanol and sodium acetate as carbon sources, while the effluent pH was much lower than the stoichiometric values and the malfunction from self-alkalization of denitrification was far less serious than expected. (2) The self-adaptation of the reactors was attributed to the neutralization of carbon dioxide (oxidization product of organic matter) and the self-adaptation of denitrifying sludge. The formation and discharge of calcium carbonate precipitates gave rise to lower effluent pH and alkalinity than the stoichiometric values.
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. Electronic address: pzheng@zju.edu.cn.
authors.forename: Ping
authors.initials: P
authors.lastname: Zheng
authors.affiliation: College of Environmental Science and Engineering, Tongji University, Shanghai 200000, China.
authors.forename: Jun
authors.initials: J
authors.lastname: Guo
authors.affiliation: College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
authors.forename: Junyuan
authors.initials: J
authors.lastname: Ji
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
authors.forename: Meng
authors.initials: M
authors.lastname: Zhang
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
authors.forename: Zonghe
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
authors.forename: Enchao
authors.initials: E
authors.lastname: Zhan
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China; Department of Chemical Engineering, University of Gujrat, Gujrat, Pakistan.
authors.forename: Ghulam
authors.initials: G
authors.lastname: Abbas
mesh_terms: D000468:Alkalies / Q000737:chemistry*; D001331:Automation; D019149:Bioreactors / Q000382:microbiology*; D058440:Denitrification / Q000187:drug effects*; D006863:Hydrogen-Ion Concentration / Q000187:drug effects; D000432:Methanol / Q000494:pharmacology*; D012722:Sewage / Q000382:microbiology; D019346:Sodium Acetate / Q000494:pharmacology*; D014865:Waste Disposal, Fluid
chemical_list: D000468:Alkalies; D012722:Sewage; D019346:Sodium Acetate; D000432:Methanol
keywords: Adaptation; Denitrifying reactor; High-rate; Self-alkalization