Simultaneous Removal of Inorganic Nitrogen from Aquaculture Water by Rhodopseudomonas palustris CQV97
ZHANG Xiaobo;ZHU Bitong;XIONG Hui;ZHAO Chungui;YANG Suping;Department of Bioengineering and Biotechnology,Huaqiao University;
The removal of inorganic nitrogen which existed simultaneously in wastewater by Rhodopseudomonas palustrisCQV97 was investigated.Strain CQV97 could remove ammonium,nitrite(more than 40mg·L-1)and nitrate when cultured under the cenditions of 20~40℃,500~5 000 lux and pH 6.0~9.0,exhibiting stronger adaption to complicated water environment.When using acetate or ethanol as the sole carbon source,ammonium,nitrite and nitrate could be effective removed by strain CQV97,while using glucose as the sole carbon source,nitrate could be removed by strain CQV97,but ammonium could not,and nitrite was also accumulated,indicating low molecule organic carbon compounds have significant impact on the removal efficiency of inorganic nitrogen by strain CQV97.The addition of higher concentration of peptone(120mg·L-1)or urea to water resulted in ammonium accumulation.The removal of ammonium was significantly inhibited and the removal efficiency was no more than 16%(peptone)or 6%(urea),which may be concerned with ammonization of peptone degradation.However,the removal efficiency of nitrate and nitrite was not affected after addition of peptone or urea to waster.In actual aquaculture wastewater treatment experiment,compared to the control,nitrate and nitrite could be completely removed by CQV97,ammonium was also decreased significantly,whereas in control experiment,inorganic nitrogen concentrations were still kept at higher concentration level.Collectively,R.palustris CQV97 is not only capable of flourishing in complicated water environmentcontaining inorganic nitrogen and different organic compounds,but also removing the ammonium,nitrite and nitrate with higher efficiency.
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