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

2012 ◽  
Vol 118 ◽  
pp. 136-140 ◽  
Author(s):  
Weizhong Wu ◽  
Feifei Yang ◽  
Luhua Yang
2013 ◽  
Vol 702 ◽  
pp. 218-223
Author(s):  
He Ming Wang ◽  
Fan Yang

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.


2009 ◽  
Vol 81 (3) ◽  
pp. 242-247 ◽  
Author(s):  
Zu-xin Xu ◽  
Liu Shao ◽  
Hai-long Yin ◽  
Hua-qiang Chu ◽  
Yi-jun Yao

2010 ◽  
Vol 101 (6) ◽  
pp. 1787-1791 ◽  
Author(s):  
Prashant M. Biradar ◽  
S.B. Roy ◽  
S.F. D’Souza ◽  
A.B. Pandit

2015 ◽  
Vol 189 ◽  
pp. 266-272 ◽  
Author(s):  
Gholamreza Moussavi ◽  
Seyed Javad Jafari ◽  
Kamyar Yaghmaeian

2012 ◽  
Vol 518-523 ◽  
pp. 2064-2067 ◽  
Author(s):  
Yin Mei Wang

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.


2015 ◽  
Vol 71 (7) ◽  
pp. 1019-1025 ◽  
Author(s):  
Chuanfu Wu ◽  
Danqi Tang ◽  
Qunhui Wang ◽  
Juan Wang ◽  
Jianguo Liu ◽  
...  

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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