scholarly journals The operational efficiency of a novel AnMBR treating antibiotic solvent wastewater in start-up stage

2016 ◽  
Vol 7 (3) ◽  
pp. 326-337 ◽  
Author(s):  
Dongxue Hu ◽  
Yu Tian ◽  
Zhijiang Wang ◽  
Pan Wu ◽  
Peier Wang ◽  
...  
Keyword(s):  
Volatile Fatty Acid ◽  
Membrane Bioreactor ◽  
Suspended Solids ◽  
Biological Process ◽  
Community Analysis ◽  
Mean Value ◽  
Microbial Community Analysis ◽  
Anaerobic Sludge ◽  
Start Up ◽  
Over Time

The performance of a novel anaerobic membrane bioreactor (AnMBR) for treating antibiotic solvent wastewater was investigated in the start-up stage. The removal efficiencies of the four tested antibiotics were over 90%, mainly attributed to the biological process. Volatile fatty acid increased along with anaerobic sludge acclimation. pH (mean value 7.5) and a (mean value 0.12) remained stable. Mixed liquid suspended solids and mixed liquor volatile suspended solids increased along with the sludge acclimation as well. The protein and polysaccharide in suspended sludge decreased, while the protein/polysaccharide in exopolysaccharides increased. Microbial community analysis showed the abundance of Methanosarcina spp. fluctuated over time and was finally stable at 17%. The abundance of Methanosaeta spp. increased significantly. There are two kinds of hydrogen producing methane producing microorganisms (Methanobacteriales and Methanomicrobiales) in AnMBR. Methanobacteriales was the dominant methanogenus. These results indicate that an AnMBR can effectively treat antibiotic solvent wastewater in the start-up period.

scholarly journals Development of a combined anaerobic and aerobic membrane bioreactor for wastewater treatment and reclamation in terrestrial-based controlled ecological life support system

2018 ◽  
Vol 19 (3) ◽  
pp. 718-724
Author(s):  
Zhenmin Cheng ◽  
Yuansong Wei ◽  
Min Gao ◽  
Junya Zhang ◽  
Liangchang Zhang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Support System ◽  
Membrane Bioreactor ◽  
Life Support ◽  
Specific Energy Consumption ◽  
Community Analysis ◽  
Microbial Community Analysis ◽  
Trace Gas ◽  
Life Support System ◽  
Physico Chemical

Abstract A novel wastewater treatment and reuse system (WTRS) combining an anaerobic membrane bioreactor (AnMBR) and an aerobic membrane bioreactor (MBR) with the design capacity of 115 L/d was developed for a terrestrial-based controlled ecological life support system (CELSS). Results clearly showed that the WTRS realized mineralization of organic compounds and reservation of nitrogenous nutrient, therefore converting the effluent into replenishment for the hydroponic system. Trace gas emission from the WTRS could meet requirements for the whole CELSS. Compared with physico-chemical processes, the specific consumables consumption of the WTRS was advantageous but its specific energy consumption is still in need of improvement. Results of microbial community analysis were consistent with the running state of the AnMBR and the MBR.

scholarly journals Hybrid membrane bioreactor for water recycling and phosphorus recovery

2006 ◽  
Vol 53 (7) ◽  
pp. 17-24 ◽  
Author(s):  
Y. Watanabe ◽  
K. Kimura
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Community Analysis ◽  
Hybrid Membrane ◽  
Phosphorus Recovery ◽  
Microbial Community Analysis ◽  
Low Viscosity ◽  
Ph Range ◽  
Phosphoric Acids

This paper deals with the performance of hybrid membrane bioreactor (MBR) combining the precoagulation/sedimentation and membrane bioreactor. The hybrid MBR not only produces the treated water with excellent permeate quality but also shows much lower membrane fouling than the conventional MBR. It may come from its extremely low F/M ratio to maintain the low viscosity even in the high MLSS concentration range of about 20,000 mg/L. Some results of microbial community analysis in MBRs was conducted to demonstrate the other reason for its lower membrane fouling. Hybrid MBR has a high potential to be used for the recycling use of the municipal wastewater. Coagulated sludge produced in the hybrid MBR is a promising phosphorus resource. This paper also contains a recent progress of phosphorus recovery technology, which uses a new phosphoric acids absorbent, i.e. the hexagonal mesostructured zirconium sulfate (ZS). The ZS has the extremely high adsorption capacity of phosphoric acids through anion exchange. The adsorbed phosphoric acids are released from the ZS in a high pH range of about 13.

Effect of tungsten and selenium on C1 gas bioconversion by an enriched anaerobic sludge and microbial community analysis

Chemosphere ◽  
2020 ◽  
Vol 250 ◽  
pp. 126105
Author(s):  
Samayita Chakraborty ◽  
Eldon R. Rene ◽  
Piet N.L. Lens ◽  
Jukka Rintala ◽  
María C. Veiga ◽  
...  
Keyword(s):  
Microbial Community ◽  
Community Analysis ◽  
Microbial Community Analysis ◽  
Anaerobic Sludge

Start-up of bio-hydrogen production reactor seeded with sewage sludge and its microbial community analysis

2005 ◽  
Vol 52 (1-2) ◽  
pp. 115-121 ◽  
Author(s):  
M.L. Gong ◽  
N.Q. Ren ◽  
D.F. Xing
Keyword(s):  
Microbial Community ◽  
Sewage Sludge ◽  
Hydrogen Production ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Community Analysis ◽  
Microbial Community Analysis ◽  
Organic Loading Rate ◽  
Start Up ◽  
Gradient Gel Electrophoresis ◽  
Continuously Stirred Tank Reactor

Start-up of a continuously stirred tank reactor for bio-hydrogen production under different initial organic loading rate (OLR) of 3, 7 and 10 kgCOD/m3 d, respectively, was carried out with sewage sludge as inoculum. Molasses wastewater was used as substrate and hydraulic retention time was kept at 6 h. This study aimed to assess OLR on the formation of fermentation types and the structure of microbial communities during the start-up period. It was found that at an initial OLR of 7 kgCOD/m3 d and an initial biomass of 6.24 gVSS/L, an equilibrial microbial community of ethanol-type fermentation could be established within 30 days. The observed average specific hydrogen production rate was 276 mLH2/gVSS d, which was 40% higher than that of the one acclimated with 3 kgCOD/m3 d. Based on denaturing gradient gel electrophoresis profiles, significant microbial population shifts took place at the first 15 days, but a longer period up to 30 days was required to establish a microbial community with stable metabolic activity.

scholarly journals Start-up of horizontal anaerobic reactors with sludge blanket and fixed bed for wastewater treatment from coffee processing by wet method

2013 ◽  
Vol 33 (2) ◽  
pp. 353-366 ◽  
Author(s):  
Roberto A. de Oliveira ◽  
Natani M. N. Bruno
Keyword(s):  
Fixed Bed ◽  
Oxygen Demand ◽  
Anaerobic Treatment ◽  
Mean Value ◽  
Treatment System ◽  
Anaerobic Sludge ◽  
Mean Values ◽  
Anaerobic Reactors ◽  
Start Up ◽  
The Mean

In this study it was evaluated the start-up procedures of anaerobic treatment system with three horizontal anaerobic reactors (R1, R2 and R3), installed in series, with volume of 1.2 L each. R1 had sludge blanket, and R2 and R3 had half supporter of bamboo and coconut fiber, respectively. As an affluent, it was synthesized wastewater from mechanical pulping of the coffee fruit by wet method, with a mean value of total chemical oxygen demand (CODtotal) of 16,003 mg L-1. The hydraulic retention time (HRT) in each reactor was 30 h. The volumetric organic loading (VOL) applied in R1 varied from 8.9 to 25.0 g of CODtotal (L d)-1. The mean removal efficiencies of CODtotal varied from 43 to 97% in the treatment system (R1+R2+R3), stabilizing above 80% after 30 days of operation. The mean content of methane in the biogas were of 70 to 76%, the mean volumetric production was 1.7 L CH4 (L reactor d)-1 in the system, and the higher conversions were around at 0.20 L CH4 (g CODremoved)-1 in R1 and R2. The mean values of pH in the effluents ranged from 6.8 to 8.3 and the mean values of total volatile acids remained below 200 mg L-1 in the effluent of R3. The concentrations of total phenols of the affluent ranged from 45 to 278 mg L-1, and the mean removal efficiency was of 52%. The start-up of the anaerobic treatment system occurred after 30 days of operation as a result of inoculation with anaerobic sludge with active microbiota.

Development of slow sponge sand filter (SpSF) as a post-treatment of UASB-DHS reactor effluent treating municipal wastewater

2016 ◽  
Vol 74 (1) ◽  
pp. 65-72 ◽  
Author(s):  
N. Maharjan ◽  
K. Kuroda ◽  
K. Dehama ◽  
M. Hatamoto ◽  
T. Yamaguchi
Keyword(s):  
Municipal Wastewater ◽  
Oxygen Demand ◽  
Community Analysis ◽  
Total Coliform ◽  
Post Treatment ◽  
Pollutant Removal ◽  
Microbial Community Analysis ◽  
Anaerobic Sludge ◽  
Sand Filter ◽  
Removal Efficiencies

In this study, conventional slow sand filter (SSF) and modified slow sponge sand filter (SpSF) were investigated for the post-treatment of up-flow anaerobic sludge blanket (UASB)-down-flow hanging sponge (DHS) reactor effluent. The seasonal variation did not show significant differences in removal efficiencies of both filters. However in summer, both filters were able to achieve high total suspended solids and total biochemical oxygen demand removal averaging 97% and 99%, respectively. Contrary to organic removal, total nitrogen removal efficiency was satisfactory, showing increased removal efficiencies averaging 58% and 62% for SSF and SpSF in summer. On the other hand, average total coliform removal of SSF and SpSF was 4.2 logs and 4.4 logs and corresponding Escherichia coli removal was 4.0 logs and 4.1 logs, respectively. From our observation, it could be concluded that the relative performance of SpSF for nutrients and coliforms was better than SSF due to the effectiveness of sponge media over fine sands. Moreover, microbial community analysis revealed that the members of phylum Proteobacteria were predominant in the biofilms of both filters, which could have contributed to pollutant removal. Therefore, SpSF could be concluded to be a suitable post-treatment of UASB-DHS system in warmer conditions.

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