The effect of organic loading rates and nitrogenous compounds on the aerobic granules developed using low strength wastewater

2012 ◽  
Vol 67 ◽  
pp. 52-59 ◽  
Author(s):  
Yet Nee Peyong ◽  
Yan Zhou ◽  
Ahmad Zuhairi Abdullah ◽  
Vel Vadivelu
Keyword(s):  
Aerobic Granules ◽  
Organic Loading ◽  
Nitrogenous Compounds ◽  
Loading Rates ◽  
Low Strength

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.

Functional consortium from aerobic granules under high organic loading rates

2009 ◽  
Vol 100 (14) ◽  
pp. 3465-3470 ◽  
Author(s):  
Sunil S. Adav ◽  
Duu-Jong Lee ◽  
Juin-Yih Lai
Keyword(s):  
Aerobic Granules ◽  
Organic Loading ◽  
Loading Rates

scholarly journals STUDY ON GRANULATION OF ACTIVATED SLUDGE USING SEQUENCING BATCH AIRLIFT REACTOR FOR COD AND AMMONIA REMOVAL

2009 ◽  
Vol 12 (2) ◽  
pp. 39-50
Author(s):  
Luc Trong Nguyen ◽  
Dan Phuoc Nguyen ◽  
Nam Tay Tran
Keyword(s):  
Carbon Source ◽  
Settling Velocity ◽  
Hydraulic Retention Time ◽  
Ammonia Removal ◽  
Airlift Reactor ◽  
Synthetic Wastewater ◽  
Aerobic Granules ◽  
Organic Loading ◽  
Loading Rates ◽  
Shell Powder

Synthetic wastewater with glucose as carbon source was used for cultivation of aerobic granules in sequencing batch airlift reactor (SBAR). Grinded shell powder with diatmeter of 150-200 um used as carrier. SBAR was run at hydraulic retention time (HRT) 5.1 hours, airflow of 4 liters/m and airlift velocity of 4.2 cm/s. The experiment was run at two organic loading rates (OLRs). They were 2.6 and 5.2 kg COD/m°.day, corresponding to influent COD and N-ammonia of 600; 1200 mg/l and 26; 60 mg/l, respectively. After 61 days of running, aerobic granules with size of 1,0-1,2 mm are formed. The size of granules increased to 5 mm at 80th day. Aerobic granules had settling velocity of 36-56 m/h, SVI of 11,4-44.2 ml/g. COD and N-ammonia removal of SBAR were greater than 96% and 75-90%, respectively. It was found that nitrification and denitrification occurred simultaneously in granules.' The COD and N-animonia of SBAR decreased to 70% and 51%, respectively when filamentous sludge bulking and viscous bulking appeared simultaneously.

Another carbon source for BNR system

1996 ◽  
Vol 34 (1-2) ◽  
pp. 363-369 ◽  
Author(s):  
E. Choi ◽  
H. S. Lee ◽  
J. W. Lee ◽  
S. W. Oa
Keyword(s):  
Carbon Source ◽  
Activated Sludge ◽  
Phosphorus Removal ◽  
Organic Loading ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Loading Rates ◽  
Study Results ◽  
Removal Efficiencies ◽  
Low Strength

It has been known wastewater with low COD/TKN ratio produces higher effluent NO3-N and adversely affects poly P microbes returning it to an anaerobic stage in BNR systems. Nightsoil applicability to return activated sludge line to minimize NO3-N effect to poly P microbes in anaerobic stage was examined with laboratory BNR systems operated at 20°C. The study results indicated nightsoil application could improve nitrogen and phosphorus removal efficiencies both with low strength settled municipal and piggery wastes presenting low COD/TKN ratios of 6 and 2.2, respectively. Even organic loading rates increased to 20 to 60% due to nightsoil application, the effluent COD increased only 10 to 20%. This would suggest nightsoil can be used as another carbon source and nightsoil application to return activated sludge line can be another alternative modification to improve BNR systems.

RESEARCH AND EVALUATE TREATMENT EFFICIENCY ON TAPIOCA PROCESSING INDUSTRIAL WASTEWATER BY AEROBIC BIOFILTER TECHNOLOGY WITH VARIOUS MATERIALS

2010 ◽  
Vol 13 (3) ◽  
pp. 54-66
Author(s):  
Phuong Thi Thanh Nguyen ◽  
Phuoc Van Nguyen ◽  
Anh Cam Thieu
Keyword(s):  
Wastewater Treatment ◽  
Industrial Wastewater ◽  
Utilization Rate ◽  
Organic Loading ◽  
Treatment Efficiency ◽  
Research Results ◽  
Loading Rates

This study was performed to evaluate the efficiency of tapioca processing wastewater treatment using aerobic biofilter with variety of biofilter media: coir, coal, PVC plastic and Bio - Ball BB15 plastic. Research results in the lab demonstrated all four aerobic biofilter models processed can treated completely N and COD which COD reached 90-98% and N reached 61-92%, respectively, at the organic loading rates in range of 0.5, 1, 1.5 and 2 kgCOD/m3.day. The results identified coir filter was the best in four researched materials with removal COD and specific substract utilization rate can reach 98%, and 0.6 kg COD/kgVSS.day. Research results open the new prospects for the application of the cheap materials, available for wastewater treatment.

Stabilization of Organic Carbon and Nitrogen in Consolidating Benthal Deposits

1985 ◽  
Vol 17 (6-7) ◽  
pp. 929-940 ◽  
Author(s):  
C. W. Bryant ◽  
L. G. Rich
Keyword(s):  
Organic Carbon ◽  
Model Verification ◽  
Volatile Acid ◽  
Free Energies ◽  
Organic Loading ◽  
Carbon And Nitrogen ◽  
Loading Rates ◽  
Degradation Reactions ◽  
The Individual ◽  
Organic Deposits

The objective of this research was to develop and validate a predictive model of the benthal stabilization of organic carbon and nitrogen in deposits of waste activated sludge solids formed at the bottom of an aerated water column, under conditions of continual deposition. A benthal model was developed from a one-dimensional, generalized transport equation and a set of first-order biological reactions. For model verification, depth profiles of the major interstitial carbon and nitrogen components were measured from a set of deposits formed in the laboratory at 20°C and a controlled loading rate. The observed sequence of volatile acid utilization in each benthal deposit was that which would be predicted by the Gibbs free energies of the individual degradation reactions and would be controlled by the reduction in interstitial hydrogen partial pressure with time. Biodegradable solids were solubilized rapidly during the first three weeks of benthal retention, but subsequent solubilization occurred much more slowly. The benthal simulation effectively predicted the dynamics of consolidating, organic deposits. Simulation of organic loading rates up to 250 g BVSS/(m2 day) indicated that the stabilization capacity of benthal deposits was far above the range of organic loading rates currently used in lagoon design.

Wastewater fermentation and nutrient removal in sequencing batch reactors

1998 ◽  
Vol 38 (1) ◽  
pp. 255-264 ◽  
Author(s):  
Germán Cuevas-Rodríguez ◽  
Óscar González-Barceló ◽  
Simón González-Martínez
Keyword(s):  
Activated Sludge ◽  
Volatile Fatty Acids ◽  
Organic Load ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Organic Loading ◽  
Nitrogen And Phosphorus ◽  
Loading Rates ◽  
Average Value ◽  
Experimental Runs

This research project was conducted to analyze the performance of a SBR reactor when being fed with anaerobically fermented wastewater. Important was to determine the capacity of the system to remove nitrogen and phosphorus. Two SBR reactors, each one with a volume of 980 liters, were used: one used as fermenter and the other as activated sludge SBR. Using 8-hour cycles, the reactors were operated and studied during 269 days. The fermenter produced an effluent with an average value of 223±24 mg/l of volatile fatty acids. The activated sludge SBR was tested under 3 organic loading rates of 0.13, 0.25, and 0.35 kgCODtotal/kgTSS·d. For the three tested organic loading rates, PO4-P concentrations under 1.1 mg/l and COD between 37 and 38 mg/l were consistently achieved. Exceptionally high NH4-N influent values were measured during the time of the experimentation with the organic load of 0.25 kgCODtotal/kgTSS·d, not reaching in this case full nitrification. Denitrification was observed during the fill phase in every cycle. SVI values between 40 and 70 were determined during the experimental runs.

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