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• W2975536660 abstract "The river sediment contains a lot of pollutants in many cases, and needs to be treated appropriately for the restoration of water environments. In this study, a novel method was developed to convert river sediment into denitrifying sludge in a sequencing batch reactor (SBR). The river sediment was added into the reactor daily and the hydraulic retention time (HRT) of the reactor was gradually reduced from 8 to 4 h. The reactor achieved in the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mrow> <mml:mi mathvariant=normal>N</mml:mi> </mml:mrow> <mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>O</mml:mi> </mml:mrow> <mml:mn>3</mml:mn> <mml:mrow> <mml:mo> </mml:mo> <mml:mtext>–</mml:mtext> </mml:mrow> </mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>N</mml:mi> </mml:mrow> </mml:math> removal efficiency of 85% with the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mrow> <mml:mi mathvariant=normal>N</mml:mi> </mml:mrow> <mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>O</mml:mi> </mml:mrow> <mml:mn>3</mml:mn> <mml:mrow> <mml:mo> </mml:mo> <mml:mtext>–</mml:mtext> </mml:mrow> </mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>N</mml:mi> </mml:mrow> </mml:math> removal rate of 0.27 kg N m −3 d −1 . Response surface analysis represents that nitrate removal was affected mainly by HRT, followed by sediment addition. The denitrifying sludge achieved the highest activity with the following conditions: <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mrow> <mml:mi mathvariant=normal>N</mml:mi> </mml:mrow> <mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>O</mml:mi> </mml:mrow> <mml:mn>3</mml:mn> <mml:mrow> <mml:mo> </mml:mo> <mml:mtext>–</mml:mtext> </mml:mrow> </mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>N</mml:mi> </mml:mrow> </mml:math> 50 mg l −1 , HRT 6 h and adding 6 ml river sediments to 1 l wastewater of reactor per day. As a result, the cultivated denitrifying sludge could remove 80% <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:mrow> <mml:mi mathvariant=normal>N</mml:mi> </mml:mrow> <mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>O</mml:mi> </mml:mrow> <mml:mn>3</mml:mn> <mml:mrow> <mml:mo> </mml:mo> <mml:mtext>–</mml:mtext> </mml:mrow> </mml:msubsup> <mml:mrow> <mml:mi mathvariant=normal>N</mml:mi> </mml:mrow> </mml:math> for real municipal wastewater, and the high-throughput sequence analysis indicated that major denitrifying bacteria genera and the relative abundance in the cultivated denitrifying sludge were Diaphorobacter (33.82%) and Paracoccus (24.49%). The river sediments cultivating method in this report can not only obtain denitrifying sludge, but also make use of sediment resources, which has great application potential." @default.
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• W2975536660 date "2019-09-25" @default.
• W2975536660 modified "2023-09-26" @default.
• W2975536660 title "Cultivating river sediments into efficient denitrifying sludge for treating municipal wastewater" @default.
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