Bacterial Community and Biological Nitrate Removal: Comparisons of Autotrophic and Heterotrophic Reactors for Denitrification with Raw Sewage

A suitable carbon source is significant for biological nitrate removal from groundwater. In this study, slow-release carbon sources containing polylactic acid (PLA) and starch at 8:2, 7:3, 6:4, 5:5, 4:6, and 3:7 ratios were prepared using a blending and fusing technique. The PLA/starch blend was then used as a solid carbon source for biological nitrate removal. The carbon release rate of PLA/starch was found to increase with increased starch content in leaching experiments. PLA/starch at 5:5 mass ratio was found to have the highest denitrification performance and organic carbon consumption efficiency in semi-continuous denitrification experiments, and was also revealed to support complete denitrification at 50 mg-N/L influent nitrate concentration in continuous experiments. The effluent nitrate concentration was <2 mg NO3–-N/L, which met the national standard (GB 14848-93) for groundwater. Scanning electron microscopy results further showed that the surface roughness of PLA/starch increased with prolonged experimental time, which may be conducive to microorganism attachment. Therefore, PLA/starch was a suitable carbon source and biofilm carrier for groundwater remediation.

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Nitrate removal efficiency and bacterial community of polycaprolactone-packed bioreactors treating water from a recirculating aquaculture system

Aquaculture International ◽

10.1007/s10499-018-0251-5 ◽

2018 ◽

Vol 26 (3) ◽

pp. 773-784 ◽

Cited By ~ 5

Author(s):

Guozhi Luo ◽

Zefeng Liu ◽

Jinfang Gao ◽

Zhiwei Hou ◽

Hongxin Tan

Keyword(s):

Bacterial Community ◽

Removal Efficiency ◽

Nitrate Removal ◽

Recirculating Aquaculture System ◽

Recirculating Aquaculture ◽

Aquaculture System

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Bacterial community and nitrate removal by simultaneous heterotrophic and autotrophic denitrification in a bioelectrochemically-assisted constructed wetland

Bioresource Technology ◽

10.1016/j.biortech.2017.09.045 ◽

2017 ◽

Vol 245 ◽

pp. 993-999 ◽

Cited By ~ 32

Author(s):

Dan Xu ◽

Enrong Xiao ◽

Peng Xu ◽

Lili Lin ◽

Qiaohong Zhou ◽

...

Keyword(s):

Bacterial Community ◽

Constructed Wetland ◽

Nitrate Removal ◽

Autotrophic Denitrification

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Biological nitrate removal using sugar-industry wastes

Paddy and Water Environment ◽

10.1007/s10333-006-0040-z ◽

2006 ◽

Vol 4 (3) ◽

pp. 139-144 ◽

Cited By ~ 16

Author(s):

Tatsuki Ueda ◽

Yoshiyuki Shinogi ◽

Masaru Yamaoka

Keyword(s):

Sugar Industry ◽

Nitrate Removal ◽

Biological Nitrate Removal

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Groundwater denitrification with alternative carbon sources

Water Science & Technology ◽

10.2166/wst.1998.0257 ◽

1998 ◽

Vol 38 (6) ◽

pp. 237-243 ◽

Cited By ~ 22

Author(s):

A. Mohseni-Bandpi ◽

D. J. Elliott

Keyword(s):

Acetic Acid ◽

Carbon Source ◽

Nitrate Nitrogen ◽

Nitrogen Concentration ◽

Nitrate Removal ◽

Carbon Sources ◽

Pilot Scale ◽

Rotating Biological Contactor ◽

Nitrogen Ratio ◽

Biological Nitrate Removal

A pilot scale rotating biological contactor (RBC) was used to investigate the removal of nitrate-nitrogen from groundwater using three different carbon sources, i.e., methanol, ethanol and acetic acid. Optimum carbon sources to influent nitrate-nitrogen ratio were established by varying the influent concentration of carbon sources. The optimum ratio of methanol, ethanol and acetic acid to nitrate-nitrogen ratios were found to be 2.9, 2.35 and 4.3 respectively. The nitrate-nitrogen removal efficiency averaged 93, 91 and 98 for methanol, ethanol and acetic acid respectively at a loading rate of 76 mg/m2.h. The results of this study show that the acetic acid is the most efficient carbon source for removal of nitrate-nitrogen. Effluent nitrite-nitrogen concentration was minimum for acetic acid as compared with ethanol and methanol. The effluent contained minimum suspended solids and turbidity for methanol as a carbon source. The results of this study indicate that biological nitrate removal using a RBC is a reliable and stable system under all the three carbon sources. The denitrified water in all cases requires some post treatment to oxidise the residual carbon source and remove biomass before distribution.

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