Pseudomonas sp. AOB-7 utilizes PHA granules as a sustained-release carbon source and biofilm carrier for aerobic denitrification of aquaculture water

2020 ◽  
Vol 104 (7) ◽  
pp. 3183-3192 ◽  
Author(s):  
Xi-Yan Gao ◽  
Ying Liu ◽  
Li-Li Miao ◽  
Zhi-Pei Liu
Keyword(s):  
Carbon Source ◽  
Sustained Release ◽  
Aerobic Denitrification ◽  
Pseudomonas Sp ◽  
Biofilm Carrier ◽  
Aquaculture Water

Biological granulated activated carbon fluidized bed reactor for atrazine remediation

2004 ◽  
Vol 49 (11-12) ◽  
pp. 215-222 ◽  
Author(s):  
M. Herzberg ◽  
C.G. Dosoretz ◽  
S. Tarre ◽  
M. Beliavski ◽  
M. Green
Keyword(s):  
Fluidized Bed ◽  
Fluidized Bed Reactor ◽  
Batch Adsorption ◽  
Pseudomonas Sp ◽  
Partial Penetration ◽  
Biofilm Carrier ◽  
Degradation Rates ◽  
Degrading Bacteria ◽  
Atrazine Degradation ◽  
Granulated Activated Carbon

To show that an adsorbing biofilm carrier (GAC) can be advantageous for atrazine bioremediation over a non-adsorbing carrier, fluidized bed (FB) reactors were operated under atrazine limiting concentrations using Pseudomonas sp. strain ADP as the atrazine degrading bacteria. The following interrelated subjects were investigated: 1) atrazine adsorption to GAC under conditions of atrazine partial penetration in the biofilm, 2) differences in atrazine degradation rates and 3) stability of atrazine biodegradation under non-sterile anoxic conditions in the GAC reactor versus a reactor with a non-adsorbing biofilm carrier. Results from batch adsorption tests together with modeling best described the biofilm as patchy in nature with covered and non-biofilm covered areas. Under conditions of atrazine partial penetration in the biofilm, atrazine adsorption occurs in the non-covered areas and is consequently desorbed at the base of the biofilm substantially increasing the active biofilm surface area. The double flux of atrazine to the biofilm in the GAC reactor results in lower effluent atrazine concentrations as compared to a FB reactor with a non-adsorbing carrier. Moreover, under non-sterile denitrification conditions, atrazine degradation stability was found to be much higher (several months) using GAC as a biofilm carrier while non-adsorbing carrier reactors showed sharp deterioration within 30 days due to contamination of non-atrazine degrading bacteria.

scholarly journals Pandrug-resistant Pseudomonas sp. expresses New Delhi metallo-β-lactamase-1 and consumes ampicillin as sole carbon source

2020 ◽  
Author(s):  
Vivek Kumar Ranjan ◽  
Shriparna Mukherjee ◽  
Subarna Thakur ◽  
Krutika Gupta ◽  
Ranadhir Chakraborty
Keyword(s):  
Carbon Source ◽  
Sole Carbon Source ◽  
New Delhi ◽  
Pseudomonas Sp

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.

Aerobic Denitrification by Pseudomonas sp. B6-2 Isolated from Pond Sediment

2013 ◽  
Vol 12 (2) ◽  
pp. 140-145
Author(s):  
Yuan Kping ◽  
Mao Tao ◽  
Su Yinbin ◽  
Huang Jian
Keyword(s):  
Aerobic Denitrification ◽  
Pseudomonas Sp ◽  
Pond Sediment

A non-naturally-occurring P(3HB-co-3HAMCL) is produced by recombinant Pseudomonas sp. from an unrelated carbon source

2018 ◽  
Vol 114 ◽  
pp. 512-519 ◽  
Author(s):  
Lucas G. Cespedes ◽  
Rafael A.T.P.S. Nahat ◽  
Thatiane T. Mendonça ◽  
Rafaela R. Tavares ◽  
Edmar R. Oliveira-Filho ◽  
...  
Keyword(s):  
Carbon Source ◽  
Pseudomonas Sp ◽  
Naturally Occurring

scholarly journals Comparison of Clay Ceramsite and Biodegradable Polymers as Carriers in Pack-bed Biofilm Reactor for Nitrate Removal

2019 ◽  
Vol 16 (21) ◽  
pp. 4184
Author(s):  
Qian Zhang ◽  
Xue Chen ◽  
Heng Wu ◽  
Wandong Luo ◽  
Xiangyang Liu ◽  
...  
Keyword(s):  
Carbon Source ◽  
Biodegradable Polymers ◽  
Nitrogen Removal ◽  
Solid Phase ◽  
Biofilm Reactor ◽  
Attractive Alternative ◽  
Low Carbon ◽  
Conventional Process ◽  
Biofilm Carrier ◽  
Denitrification Process

In recent years, there is a trend of low C/N ratio in municipal domestic wastewater, which results in serious problems for nitrogen removal from wastewater. The addition of an external soluble carbon source has been the usual procedure to achieve denitrification. However, the disadvantage of this treatment process is the need of a closed, rather sophisticated and costly process control as well as the risk of overdosing. Solid-phase denitrification using biodegradable polymers as biofilm carrier and carbon source was considered as an attractive alternative for biological denitrification. The start-up time of the novel process using PCL (polycaprolactone) as biofilm carrier and carbon source was comparable with that of conventional process using ceramsite as biofilm carrier and acetate as carbon source. Further, the solid-phase denitrification process showed higher nitrogen removal efficiency under shorter hydraulic retention time (HRT) and low carbon to nitrogen (C/N) ratio since the biofilm was firmly attached to the clear pores on the surface of PCL carriers and in this process bacteria that could degrade PCL carriers to obtain electron donor for denitrification was found. In addition, solid-phase denitrification process had a stronger resistance of shock loading than that in conventional process. This study revealed, for the first time, that the physical properties of the biodegradable polymer played a vital role in denitrification, and the different microbial compositions of the two processes was the main reason for the different denitrification performances under low C/N ratio.

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