Effects of High Sludge Cycle Frequency on Performance and Syntrophic Metabolism of Anaerobic Membrane Bioreactor for Treating High-Lipid Kitchen Waste Slurry

The performance and syntrophic metabolism of the Anaerobic Membrane Bio-reactor (AnMBR) treating high-lipid kitchen waste slurry under different sludge cycle frequencies were investigated in this study. When the sludge cycle frequencies were 3.6 cycles/h, 9.0 cycles/h and 14.4 cycles/h, the obtained Organic Loading Rates (OLRs) were 10.3 kg-COD/m3d, 12.4 kg-COD/m3d and 18.1 kg-COD/m3d, while the corresponding biogas productions were 190 L/d, 310 L/d and 520 L/d. Moreover, with an increase of sludge cycle frequency, the Chemical Oxygen Demand (COD) removal efficiency improved from 86.2% to 90.4% and 96.3%. Additionally, the higher sludge cycle frequency did not break up the sludge flocs and further affect the syntrophic degradation of the toxic Long-Chain Fatty Acids (LCFAs). Conversely, the higher sludge cycle frequency enhanced LCFA degradation and decreased LCFA accumulation. Meanwhile, under higher sludge cycle frequencies, the abundance of syntrophic Methanobacterium, Syntrophomonas and Clostridium increased and favored the syntrophic metabolism of LCFAs.

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Process stability and microbial response of anaerobic membrane bioreactor treating high-strength kitchen waste slurry under different organic loading rates

International Biodeterioration & Biodegradation ◽

10.1016/j.ibiod.2017.03.012 ◽

2017 ◽

Vol 121 ◽

pp. 35-43 ◽

Cited By ~ 17

Author(s):

Xiaolan Xiao ◽

Wansheng Shi ◽

Zhenxing Huang ◽

Wenquan Ruan ◽

Hengfeng Miao ◽

...

Keyword(s):

Membrane Bioreactor ◽

High Strength ◽

Organic Loading ◽

Process Stability ◽

Kitchen Waste ◽

Loading Rates ◽

Anaerobic Membrane Bioreactor ◽

Microbial Response

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

Water Science & Technology ◽

10.2166/wst.2009.377 ◽

2009 ◽

Vol 60 (3) ◽

pp. 605-614 ◽

Cited By ~ 24

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.

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Anaerobic co-digestion of winery waste and waste activated sludge: assessment of process feasibility

Water Science & Technology ◽

10.2166/wst.2013.692 ◽

2013 ◽

Vol 69 (2) ◽

pp. 269-277 ◽

Cited By ~ 15

Author(s):

C. Da Ros ◽

C. Cavinato ◽

F. Cecchi ◽

D. Bolzonella

Keyword(s):

Activated Sludge ◽

Biogas Production ◽

Oxygen Demand ◽

Pilot Scale ◽

Waste Activated Sludge ◽

Organic Loading ◽

Operational Conditions ◽

Loading Rates ◽

Thermophilic Conditions ◽

Soluble Chemical Oxygen Demand

In this study the anaerobic co-digestion of wine lees together with waste activated sludge in mesophilic and thermophilic conditions was tested at pilot scale. Three organic loading rates (OLRs 2.8, 3.3 and 4.5 kgCOD/m3d) and hydraulic retention times (HRTs 21, 19 and 16 days) were applied to the reactors, in order to evaluate the best operational conditions for the maximization of the biogas yields. The addition of lee to sludge determined a higher biogas production: the best yield obtained was 0.40 Nm3biogas/kgCODfed. Because of the high presence of soluble chemical oxygen demand (COD) and polyphenols in wine lees, the best results in terms of yields and process stability were obtained when applying the lowest of the three organic loading rates tested together with mesophilic conditions.

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Performance of Anaerobic Digestion of Acidified Palm Oil Mill Effluent under Various Organic Loading Rates and Temperatures

Water ◽

10.3390/w12092432 ◽

2020 ◽

Vol 12 (9) ◽

pp. 2432

Author(s):

Muhammad Arif Fikri Hamzah ◽

Peer Mohamed Abdul ◽

Safa Senan Mahmod ◽

Azratul Madihah Azahar ◽

Jamaliah Md. Jahim

Keyword(s):

Anaerobic Digestion ◽

Palm Oil ◽

Denaturing Gradient Gel Electrophoresis ◽

Oxygen Demand ◽

Microbial Community Analysis ◽

Palm Oil Mill Effluent ◽

Methane Formation ◽

Organic Loading ◽

Loading Rates ◽

Palm Oil Mill

This study compared the performance of thermophilic and mesophilic digesters of an anaerobic digestion system from palm oil mill effluent (POME), in which temperature is a key parameter that can greatly affect the performance of anaerobic digestion. The digesters were incubated at two distinct temperatures of 55 and 37 °C, and operated with varying organic loading rates (OLRs) of 2.4, 3.2, and 4.0 g COD/L.d by altering the chemical oxygen demand (COD) of acidified POME during feeding. The results indicated that the performance of anaerobic digestion increased as the OLR increased from 2.4 to 4.0 g COD/L.d. At the OLR of 4.0 g COD/L.d, the thermophilic condition showed the highest methane yield of 0.31 ± 0.01 L/g COD, accompanied by the highest COD removal and volatile solid reduction, which were found to be higher than the mesophilic condition. Microbial community analysis via denaturing gradient gel electrophoresis (DGGE) revealed that Methanothermobacter sp. emerges as the dominant microbe, which is known to utilize the carbon dioxide pathway with hydrogen acting as an electron donor for methane formation

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Considering a membrane bioreactor for the treatment of vegetable oil refinery wastewaters at industrially relevant organic loading rates

Bioprocess and Biosystems Engineering ◽

10.1007/s00449-020-02294-9 ◽

2020 ◽

Vol 43 (6) ◽

pp. 981-995 ◽

Cited By ~ 1

Author(s):

Elham Abdollahzadeh Sharghi ◽

Azadeh Shourgashti ◽

Babak Bonakdarpour

Keyword(s):

Vegetable Oil ◽

Membrane Bioreactor ◽

Oil Refinery ◽

Organic Loading ◽

Loading Rates

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Dolomitic limestone as an alkalizing agent for treating cassava starch wastewater in an anaerobic reactor

Revista CERES ◽

10.1590/0034-737x201865050002 ◽

2018 ◽

Vol 65 (5) ◽

pp. 388-394

Author(s):

Denise Palma ◽

Julia Piechontcoski Fernandes ◽

Marney Pascoli Cereda ◽

Simone Damasceno Gomes

Keyword(s):

Oxygen Demand ◽

Cassava Starch ◽

Total Alkalinity ◽

Dolomitic Limestone ◽

Organic Loading ◽

Reactor Operation ◽

Anaerobic Reactor ◽

Loading Rates ◽

Volatile Acidity ◽

Starch Wastewater

ABSTRACT Cassava processing wastewater has a low Volatile Acidity/Total Alkalinity ratio, low buffering capacity and became quickly acidified. In this trial, dolomitic limestone was used as an alkalizing agent in an anaerobic reactor to treat cassava starch wastewater. The dolomitic limestone contained 27% CaO and 23% MgO and granulometry between 24.5 and 38.1 mm. The average Chemical Oxygen Demand of the wastewater was 13331.30 mgO2 L-1, the organic loading rates (OLR) ranged from 1.23 to 16.43 gCOD L-1 d-1 and the hydraulic retention times ranged from 10.00 to 0.80 days. The results showed that the calcium concentrations increased in the reactor effluent and the magnesium concentrations decreased as the organic loading rates increased. Ca2+ and Mg2+ concentrations were approximately 5,000 and 5.05 times greater in the sludge than in the inoculum, respectively. The average pH, Total alcalinity, Volatile Acidity and Volatile Acidity/ Total alcalinity values were 6.69, 882.54 mgCaCO3 L-1, 221.55 mgCH3COOH L-1 and 0.22, respectively. The loss of limestone mass corresponded to only 2.51% of the initial mass, after 134 days of anaerobic reactor operation. Finally, it was concluded that the limestone effectively controlled acidification through the alkalinity increased in the system.

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Performance of Modified Anaerobic Hybrid Baffled (MAHB) bioreactor treating recycled paper mill effluent: Effects of organic loading rates

Journal of Tropical Resources and Sustainable Science (JTRSS) ◽

10.47253/jtrss.v6i1.720 ◽

2021 ◽

Vol 6 (1) ◽

pp. 15-18

Author(s):

Siti Roshayu Hassan ◽

Irvan Dahlan

Keyword(s):

Hydraulic Retention Time ◽

Biogas Production ◽

Oxygen Demand ◽

Paper Mill ◽

Organic Loading ◽

Recycled Paper ◽

Paper Mill Effluent ◽

Loading Rates ◽

Bioreactor System ◽

Maximum Removal

The performance of modified anaerobic hybrid baffled (MAHB) bioreactor treating recycled paper mill effluent (RPME) was investigated at various organic loading rates (OLR) of 1, 2, 3 and 4 g COD/ L.day. The bioreactor was operated continuously at constant hydraulic retention time (HRT) of a day without effluent recycled and chemicals adjustment/addition. Throughout 70 days of operation, a maximum removal efficiency up to 97% of chemical oxygen demand (COD) and 98% of volatile fatty acid, biogas production of 12.51 L/day equivalent to methane (CH4) yield of 0.108L CH4/ g COD and a stable pH system between 6.6 to 7.2 were achieved. Additionally, alkalinity of the bioreactor system shows a stable profile that indicates the whole system was well buffered with a quit high degradation of volatile solid (VS) up to 18%. These results indicated that MAHB bioreactor has been successfully treated RPME at various OLR.

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