Soybean processing wastewater supported the removal of propyzamide and biochemical accumulation from wastewater by Rhodopseudomonas capsulata
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Simultaneous (SPW and propyzamide) wastewater treatment and the production of biochemicals by Rhodopseudomonas capsulata (R. capsulata) were investigated with supplement of soybean processing wastewater (SPW). Compared to control group, propyzamide was removed and biochemicals production were enhanced with the supplement of SPW. Propyzamide induced camH gene expression through activating MAPKKKs gene in MAPK signal transduction pathway. The induction of camH gene and CamH occurs after 1 day for R. capsulata. However, lack of organics in original wastewater did not maintain R. capsulata growth for over 1 day. The supplement of SPW provided sufficient carbon source for R. capsulata under three addition dosages. This new method resulted in the mixed (SPW and propyzamide) wastewater treatment and improvement of biochemicals simultaneously, as well as the realization of reutilization of wastewater and R. capsulata as sludge. Meanwhile, high-order nonlinear mathematical model of the relationship between propyzamide removal rate, Xt and Xt/r, was established.
KeywordsPropyzamide wastewater CamH camH gene SPW R. capsulata
The authors gratefully acknowledge the National Nature Science Fund for Distinguished Young Scholars of China (Grant no. 41625002), the National Natural Science Foundation Young of China (Grant no. 31700432), the National Natural Science Foundation of China (Grant nos. 31700432; 31470550; 81500493; 31400386; 51778114), Post-doctoral Science Foundation Project of China and Heilongjiang Province of China (Grant nos. 2018M641797; LBH-Z18025), Natural Science Foundation of Guangdong Province (Grant nos. 2015A030313098), Application Technology Research and Development Projects of Harbin (Grant no. 2016RAXXJ103), and the MOA Modern Agricultural Talents Support Project for valuable financial support, and Basic scientific research service fees of the Central University and Dalian Nationalities University (0113-20000101).
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