Influence of organic loading rates on treatment performance of membrane bioreactor treating tannery wastewater

2021 ◽  
pp. 101810
Author(s):  
Thi-Dieu-Hien Vo ◽  
Xuan-Thanh Bui ◽  
Bao-Trong Dang ◽  
Thanh-Tin Nguyen ◽  
Van-Truc Nguyen ◽  
...  
Keyword(s):  
Membrane Bioreactor ◽  
Tannery Wastewater ◽  
Organic Loading ◽  
Loading Rates ◽  
Treatment Performance

The anaerobic treatment of low strength wastewaters in UASB and EGSB reactors

1997 ◽  
Vol 36 (6-7) ◽  
pp. 375-382 ◽  
Author(s):  
Mario T. Kato ◽  
Jim A. Field ◽  
Gatze Lettinga
Keyword(s):  
Detrimental Effect ◽  
Granular Sludge ◽  
Anaerobic Treatment ◽  
Organic Loading ◽  
Methanogenic Activity ◽  
Loading Rates ◽  
Treatment Performance ◽  
The Media ◽  
Low Strength ◽  
Uasb Reactors

The application of the UASB and EGSB reactors for the treatment of low strength wastewaters was investigated. The effect of dissolved oxygen on the methanogenic activity of granular sludges, the low substrate levels inside reactors and lower temperatures on the treatment performance were evaluated. The results showed that methanogens located in granular sludge have a high tolerance to oxygen. The concentration to cause 50% inhibition to methanogenic activity was between 7% and 41% oxygen in the head space of flasks, corresponding to 0.05 mg/l and 6 mg/l of DO prevailing in the media, respectively. The feasibility of UASB and EGSB reactors at 30°C was demonstrated. In UASB reactors, COD removal efficiencies exceeded 95% at organic loading rates up to 6.8 g COD/l.d and influent COD concentrations ranging from 422 to 722 mg/l, during the treatment of ethanol substrate. In EGSB reactors, efficiencies were above 80% at OLRs up to 12 g COD/l.d with COD as low as 100 to 200 mg/l. The studies confirmed that in practice DO does not constitute any detrimental effect on the reactor treatment performance. Lowering the temperature down to 15°C in EGSB reactors also showed that the potentials of anaerobic technology can be further explored in the treatment of dilute wastewaters.

scholarly journals Influence of design parameters on the treatment performance of VF wetlands – a simulation study

2019 ◽  
Vol 80 (2) ◽  
pp. 265-273
Author(s):  
Bernhard Pucher ◽  
Guenter Langergraber
Keyword(s):  
Filter Material ◽  
Treatment Wetlands ◽  
Design Parameters ◽  
Vertical Flow ◽  
Organic Loading ◽  
Treatment Efficiency ◽  
Main Approach ◽  
Loading Rates ◽  
Treatment Performance ◽  
Different Temperatures

Abstract The main approach for designing vertical flow (VF) treatment wetlands is based on areal requirements ranging from 2 to 4 m2 per person equivalent (PE). Other design parameters are the granularity of the filter material, filter depth, hydraulic and organic loading rates, loading intervals, amount of single doses as well as the number of openings in the distribution pipes. The influence of these parameters is investigated by running simulations using the HYDRUS Wetland Module for three VF wetlands with different granularity of the filter material (0.06–4 mm, 1–4 mm, and 4–8 mm, respectively). For each VF wetland, simulations are carried out at different temperatures for different organic loading rates, loading intervals and number of distribution points. Using coarser filter material results in reduced removal of pollutants and higher effluent concentrations if VF wetlands are operated under the same conditions. However, the treatment efficiency can be increased by applying more loadings and/or a higher density of the distribution network. For finer filter material, longer loading intervals are suggested to guarantee sufficient aeration of the VF filter between successive loadings.

Application of combined membrane biological reactor and electro-oxidation processes for the treatment of landfill leachates

2009 ◽  
Vol 60 (3) ◽  
pp. 605-614 ◽  
Author(s):  
Fathi Aloui ◽  
Firas Fki ◽  
Slim Loukil ◽  
Sami Sayadi
Keyword(s):  
Membrane Bioreactor ◽  
Biological Process ◽  
Ph Value ◽  
Oxygen Demand ◽  
Ammonia Nitrogen ◽  
Optimum Conditions ◽  
Organic Loading ◽  
Landfill Leachates ◽  
Loading Rates ◽  
Electro Oxidation

Landfill leachate (LFL) is a very complex wastewater that poses considerable hazards to local communities and the environment. With this concern in mind, the present study was undertaken to investigate the performance of an aerobic membrane bioreactor treating raw LFL from Djebel Chekir (Tunisia) discharge. The LFL samples collected from this site were found to be highly loaded with organic matter, ammonia, salts, greases, phenols and hydrocarbons. Important removals of chemical oxygen demand (COD) and NH4+-N were attained after 44 days of treatment at optimum conditions for the membrane and with organic loading rates (OLR) of 1.9 and 2.7 grams COD per litter and day. This treatment allowed for an important detoxification of the landfill leachates and a significant elimination of the microorganisms. Electrochemical oxidation using Pi/Ti was applied as a post-treatment and after the biological process in order to reduce the residual ammonia and COD. At a pH value of 9, current density of 4 A dm−2 and electrolysis time of 60 minutes, COD and ammonia nitrogen were reduced to 1,000 mg L−1 and 27 mg L−1, respectively. COD and NH4+-N removals were accompanied by significant detoxification.

Biodiversity in aerobic granule membrane bioreactor at high organic loading rates

2009 ◽  
Vol 85 (2) ◽  
pp. 383-388 ◽  
Author(s):  
Yu-Chuan Juang ◽  
Sunil S. Adav ◽  
Duu-Jong Lee ◽  
Juin-Yih Lai
Keyword(s):  
Membrane Bioreactor ◽  
Aerobic Granule ◽  
Organic Loading ◽  
Loading Rates ◽  
Granule Membrane

Membrane fouling in a fermentative hydrogen producing membrane bioreactor at different organic loading rates

2010 ◽  
Vol 360 (1-2) ◽  
pp. 226-233 ◽  
Author(s):  
Lihong Shen ◽  
Yunan Zhou ◽  
Basuvaraj Mahendran ◽  
David M. Bagley ◽  
Steven N. Liss
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Organic Loading ◽  
Loading Rates ◽  
Fermentative Hydrogen
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