Comparison of rod- versus filament-type methanogenic granules: microbial population and reactor performance

1993 ◽  
Vol 39 (6) ◽  
pp. 795-803 ◽  
Author(s):  
Wei-Min Wu ◽  
J�rgen H. Thiele ◽  
Mahendra K. Jain ◽  
H. Stuart Pankratz ◽  
Robert F. Hickey ◽  
...  
Keyword(s):  
Microbial Population ◽  
Reactor Performance ◽  
Filament Type

Effect of ammonium to nitrite ratio on reactor performance and microbial population structure in anammox reactors

2019 ◽  
Vol 41 (26) ◽  
pp. 3396-3411 ◽  
Author(s):  
Nomalanga P. Gasa ◽  
Chika F. Nnadozie ◽  
Kiprotich Kosgey ◽  
Faizal Bux ◽  
Sheena Kumari
Keyword(s):  
Population Structure ◽  
Microbial Population ◽  
Reactor Performance

Reactor Performance and Microbial Population Characteristics in a Channel with Suspended and Attached Biomass

1994 ◽  
Vol 29 (7) ◽  
pp. 61-62 ◽  
Author(s):  
Y. S. Cao ◽  
G. J. Alaerts ◽  
M. Kaewsaengtham
Keyword(s):  
Microbial Activity ◽  
Microbial Population ◽  
Population Characteristics ◽  
Reactor Performance ◽  
Drainage Systems ◽  
Process Kinetics ◽  
Intrinsic Kinetics ◽  
Attached Biomass ◽  
Kinetics Of

A well mixed recirculating indoor channel was adopted to investigate aerobic heterotrophic biodegradation in drainage systems with suspended and attached biomass. The focused points include microbial activity and intrinsic kinetics of the liquid and biofilm, and the process kinetics. The linkage between reactor performance and the characteristics of biomass population was noticed.

scholarly journals Effect of COD:SO4 2− Ratio, HRT and Linoleic Acid Concentration on Mesophilic Sulfate Reduction: Reactor Performance and Microbial Population Dynamics

Water ◽  
2015 ◽  
Vol 7 (12) ◽  
pp. 2275-2292 ◽  
Author(s):  
Chungman Moon ◽  
Rajesh Singh ◽  
Sathyanarayan Veeravalli ◽  
Saravanan Shanmugam ◽  
Subba Chaganti ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Linoleic Acid ◽  
Sulfate Reduction ◽  
Acid Concentration ◽  
Microbial Population ◽  
Reactor Performance ◽  
Microbial Population Dynamics ◽  
Linoleic Acid Concentration

The anaerobic treatment of a ligno-cellulosic substrate offering little natural pH buffering capacity

1998 ◽  
Vol 38 (4-5) ◽  
pp. 29-35 ◽  
Author(s):  
C. J. Banks ◽  
P. N. Humphreys
Keyword(s):  
Ph Control ◽  
Anaerobic Treatment ◽  
Buffering Capacity ◽  
Single Stage ◽  
Stable Operation ◽  
Reactor Performance ◽  
Two Stage ◽  
Ph Buffering ◽  
Stage System ◽  
The Stability

The stability and operational performance of single stage digestion with and without liquor recycle and two stage digestion were assessed using a mixture of paper and wood as the digestion substrate. Attempts to maintain stable digestion in both single stage reactors were unsuccessful due to the inherently low natural buffering capacity exhibited; this resulted in a rapid souring of the reactor due to unbuffered volatile fatty acid (VFA) accumulation. The use of lime to control pH was unsatisfactory due to interference with the carbonate/bicarbonate equilibrium resulting in wide oscillations in the control parameter. The two stage system overcame the pH stability problems allowing stable operation for a period of 200 days without any requirement for pH control; this was attributed to the rapid flushing of VFA from the first stage reactor into the second stage, where efficient conversion to methane was established. Reactor performance was judged to be satisfactory with the breakdown of 53% of influent volatile solids. It was concluded that the reactor configuration of the two stage system offers the potential for the treatment of cellulosic wastes with a sub-optimal carbon to nitrogen ratio for conventional digestion.

Anaerobic/aerobic biodegradation of pentachlorophenol using GAC fluidized bed reactors: optimization of the empty bed contact time

1997 ◽  
Vol 36 (6-7) ◽  
pp. 107-115 ◽  
Author(s):  
Gregory J. Wilson ◽  
Amid P. Khodadoust ◽  
Makram T. Suidan ◽  
Richard C. Brenner
Keyword(s):  
Fluidized Bed ◽  
Oxygen Demand ◽  
Aerobic Biodegradation ◽  
Fluidized Bed Reactors ◽  
Reactor Performance ◽  
Reactor Operation ◽  
Significant Cost ◽  
Second Stage ◽  
Primary Substrate ◽  
Chlorinated Phenolic Compounds

An integrated reactor system has been developed to remediate pentachlorophenol (PCP) containing wastes using sequential anaerobic and aerobic biodegradation. Anaerobically, PCP was degraded to predominately equimolar concentrations (>99%) of monochlorophenol (MCP) in two GAC fluidized bed reactors at Empty Bed Contact Times (EBCTs) ranging from 18.6 to 1.15 hours. However, at lower EBCTs, MCP concentrations decreased to less than 10% of the influent PCP concentration suggesting mineralization. The optimal EBCT was determined to be 2.3 hours based on PCP conversion to MCPs and stable reactor operation. Decreasing the EBCT fourfold did not inhibit degradation of PCP and its intermediates, thus allowing removal of PCP at much lower detention time and resulting in a significant cost advantage. Analytical grade PCP was fed via syringe pumps into two fluidized bed reactors at influent concentrations of 100 mg/l and 200 mg/l, respectively. Acting as the primary substrate, ethanol was also fed into the reactors at concentrations of 697 and 1388 mg/l. Effluent PCP and chlorinated phenolic compounds were analyzed weekly to evaluate reactor performance. Biodegradation pathways were also identified. 3-chlorophenol (CP) was the predominant MCP and varied simultaneously with 3,5-dichlorophenol (DCP) concentrations. Likewise, 4-CP concentrations varied simultaneously with 3,4-DCP concentrations. A second stage aerobic GAC fluidized bed reactor was added after the anaerobic reactor to completely mineralize the remaining MCP and phenols. Data show no presence of phenol and MCP in the effluent or on the GAC. Overall, the chemical oxygen demand (COD) fed to the system was reduced from 75 g/d in the influent to less than 1.5 g/d in the effluent.

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