Biological denitrification with a novel biodegradable polymer as carbon source and biofilm carrier

As lack of organic carbon source is a key problem for biological denitrification, hemp fiber, PBS, PLA and PE were selected as raw materials, then four kinds of slow-release carbon source composite materials were prepared by 35A-double-screw extruder and used for biological denitrification. Their performan- ces were detected through static and continuous experiments. The results showed that in the static experiments, release carbon abilities of HB20 and HB40 were both not good, their CODMnwere 5.42 and 12.83mg/L respectively; In the continuous experiments, NO3-N removal rate of HLE decreased from 57.9% to 13.1% within 30 days. HBE could cause a continuous release of dissolved organic compound. In the operation of 66 days, above 96.0% NO3-N was removed and NO2-N level was below 0.02mg/L when influent NO3-N =30.0mg/L and HRT=24h. HBE was the most suitable carbon source carrier material for biological denitrification.

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Biological Denitrification Using Corncobs as a Carbon Source and Biofilm Carrier

Water Environment Research ◽

10.2175/106143008x325683 ◽

2009 ◽

Vol 81 (3) ◽

pp. 242-247 ◽

Cited By ~ 33

Author(s):

Zu-xin Xu ◽

Liu Shao ◽

Hai-long Yin ◽

Hua-qiang Chu ◽

Yi-jun Yao

Keyword(s):

Carbon Source ◽

Biological Denitrification ◽

Biofilm Carrier

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Excess cell mass as an internal carbon source for biological denitrification

Bioresource Technology ◽

10.1016/j.biortech.2009.10.049 ◽

2010 ◽

Vol 101 (6) ◽

pp. 1787-1791 ◽

Cited By ~ 26

Author(s):

Prashant M. Biradar ◽

S.B. Roy ◽

S.F. D’Souza ◽

A.B. Pandit

Keyword(s):

Carbon Source ◽

Cell Mass ◽

Biological Denitrification

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Enhanced biological denitrification in the cyclic rotating bed reactor with catechol as carbon source

Bioresource Technology ◽

10.1016/j.biortech.2015.04.019 ◽

2015 ◽

Vol 189 ◽

pp. 266-272 ◽

Cited By ~ 24

Author(s):

Gholamreza Moussavi ◽

Seyed Javad Jafari ◽

Kamyar Yaghmaeian

Keyword(s):

Carbon Source ◽

Biological Denitrification

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Application of Bio-Carrier in a Ecological Floating Bed for Removal of Nitrogenous Pollutants: A Review

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.518-523.2064 ◽

2012 ◽

Vol 518-523 ◽

pp. 2064-2067 ◽

Cited By ~ 1

Author(s):

Yin Mei Wang

Keyword(s):

Carbon Source ◽

Ion Beam ◽

Beam Irradiation ◽

Ion Beam Irradiation ◽

Immobilized Bacteria ◽

Biological Denitrification

The article reviewed the advanced methods of ecological floating bed including usage of non-biodegradable bio-carrier, choosen of excellent plants, ion-beam irradiation, immobilized bacteria and aeration. Based on the review, the authors present the idea using biodegrable materials as bio-carrier, which not only could enhance the biomass in the ecological floating bed, but also could overcome the insufficience in carbon source for biological denitrification.

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

Water Science & Technology ◽

10.2166/wst.2015.048 ◽

2015 ◽

Vol 71 (7) ◽

pp. 1019-1025 ◽

Cited By ~ 12

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.

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