Weak electricity stimulates biological nitrate removal of wastewater: Hypothesis and first evidences

2021 ◽  
Vol 757 ◽  
pp. 143764
Author(s):  
Hongbo Liu ◽  
Feiyu Ouyang ◽  
Zihua Chen ◽  
Zhongbing Chen ◽  
Eric Lichtfouse
Keyword(s):  
Nitrate Removal ◽  
Biological Nitrate Removal

Comparison of denitrification performances using PLA/starch with different mass ratios as carbon source

2015 ◽  
Vol 71 (7) ◽  
pp. 1019-1025 ◽  
Author(s):  
Chuanfu Wu ◽  
Danqi Tang ◽  
Qunhui Wang ◽  
Juan Wang ◽  
Jianguo Liu ◽  
...  
Keyword(s):  
Carbon Source ◽  
Groundwater Remediation ◽  
Nitrate Concentration ◽  
Starch Content ◽  
Nitrate Removal ◽  
Carbon Sources ◽  
National Standard ◽  
Biofilm Carrier ◽  
Carbon Release ◽  
Biological Nitrate Removal

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.

Biological nitrate removal using sugar-industry wastes

2006 ◽  
Vol 4 (3) ◽  
pp. 139-144 ◽  
Author(s):  
Tatsuki Ueda ◽  
Yoshiyuki Shinogi ◽  
Masaru Yamaoka
Keyword(s):  
Sugar Industry ◽  
Nitrate Removal ◽  
Biological Nitrate Removal

Groundwater denitrification with alternative carbon sources

1998 ◽  
Vol 38 (6) ◽  
pp. 237-243 ◽  
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.

Enhanced biological nitrate removal by gC3N4/TiO2 composite and role of extracellular polymeric substances

2021 ◽  
pp. 112158
Author(s):  
Kuppusamy Sathishkumar ◽  
Yi Li ◽  
Mohamad S. Alsalhi ◽  
Balakrishnan Muthukumar ◽  
Gajendra Kumar Gaurav ◽  
...  
Keyword(s):  
Extracellular Polymeric Substances ◽  
Nitrate Removal ◽  
Biological Nitrate Removal

Biological nitrate removal from wastewater of a metal-finishing industry

2007 ◽  
Vol 148 (1-2) ◽  
pp. 485-490 ◽  
Author(s):  
Carmen Gabaldón ◽  
Marta Izquierdo ◽  
Vicente Martínez-Soria ◽  
Paula Marzal ◽  
Josep-Manuel Penya-roja ◽  
...  
Keyword(s):  
Nitrate Removal ◽  
Metal Finishing ◽  
Biological Nitrate Removal

Biological nitrate removal using waste-derived extracts as sole carbon source

2014 ◽  
Vol 14 (3) ◽  
pp. 276
Author(s):  
Subhankar Basu ◽  
Sakshi Verma ◽  
Ravi Karan Singh ◽  
Vidya S. Batra ◽  
Malini Balakrishnan
Keyword(s):  
Carbon Source ◽  
Sole Carbon Source ◽  
Nitrate Removal ◽  
Biological Nitrate Removal

Biological nitrate removal using a food waste-derived carbon source in synthetic wastewater and real sewage

2016 ◽  
Vol 166 ◽  
pp. 407-413 ◽  
Author(s):  
Haowei Zhang ◽  
Jianguo Jiang ◽  
Menglu Li ◽  
Feng Yan ◽  
Changxiu Gong ◽  
...  
Keyword(s):  
Carbon Source ◽  
Food Waste ◽  
Nitrate Removal ◽  
Synthetic Wastewater ◽  
Biological Nitrate Removal

scholarly journals Biological Nitrate Removal With Emerald Ash Borer-Killed Ash and High-Tannin Oak Woodchips

2021 ◽  
Vol 9 ◽  
Author(s):  
Niranga M. Wickramarathne ◽  
Laura E. Christianson ◽  
Mary E. Foltz ◽  
Julie L. Zilles ◽  
Reid D. Christianson ◽  
...  
Keyword(s):  
Nitrate Removal ◽  
Emerald Ash Borer ◽  
The United States ◽  
Dissolved Phosphorus ◽  
Nitrate Treatment ◽  
Denitrification Potential ◽  
Ash Trees ◽  
Nitrous Oxide Production ◽  
Federal Standard ◽  
Biological Nitrate Removal

Two common tree species, ash (Fraxinus sp.) and oak (Quercus sp.), could provide readily available media for denitrifying bioreactors that use wood-based carbon for biological nitrate treatment. However, it is not known if the wood from Emerald Ash Borer-killed (EAB-killed) ash trees is an effective carbon source for nitrate removal compared to other wood species or if the high-tannin nature of oak inhibits denitrification potential. This lab-scale study showed that EAB-killed ash woodchips did not significantly differ in nitrate removal or denitrification potential compared to a commercially available blend of hardwood chips. However, neither treatment performed as well as oak woodchips in these metrics. Use of high-tannin oak in bioreactors is currently restricted by a federal standard in the United States. Ash woodchips beneficially exhibited the lowest nitrous oxide production potential, and their dissolved phosphorus leaching fell within the range of other woodchip types. Emerald ash borer-killed ash wood could be an effective source for denitrifying bioreactors located within affected regions and oak woodchips merit additional investigation for the application of denitrifying bioreactors.

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