Full scale fluidized bed anaerobic reactor for domestic wastewater treatment: performance, sludge production and biofilm

Mendonça, Neyson Martins; Niciura, C.L.; Gianotti, Eloisa Pozzi; Campos, José Roberto

doi:10.2166/wst.2004.0871

Cited by 11 publications

(4 citation statements)

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“…When the treatment process finished, a small amount of sludge was generated (5.8×10 -5 kg×kg COD -1 ) compared with the conventional anaerobic process (0.611±0.33 kg×kg COD -1 ). 28 This sludge was the Fe(OH) 3 occurring during the process. The cost of this treatment process was not estimated because this work was carried out as a batch-mode reaction at a bench-scale.…”

Section: Resultsmentioning

confidence: 99%

Untitled

Sahunin¹,

Kaewboran²,

Hunsom³

2006

ScienceAsia

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Treatment of textile wastewater was carried out at room temperature in a batch reactor by using the Photo-Fenton oxidation process. The effects of initial pH of the solution (pH = 1-7), ferrous ion concentration (0-100 mg×l-1) and UV power (0-120 W) on chemical oxygen demand (COD) and color removal were examined. The results showed that this process was enhanced at the acidic pH range. The optimum condition was found to be at pH = 3, 80 mg Fe 2+ ×l-1 , 5-10 minutes operating time, 60 W UV power and 200 mg H 2 O 2 ×l-1. At this condition, approximately 52% and 90% of COD and color were removed, respectively. During the treatment process, a small amount of sludge (5.8×10-5 kg×kg COD-1) was generated. The presence of heterogeneous photocatalyst such as TiO 2 in the system accelerated the removal percentage of COD and color.

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Section: Resultsmentioning

confidence: 99%

Untitled

Sahunin¹,

Kaewboran²,

Hunsom³

2006

ScienceAsia

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“…It is apparent that the biomass grew mainly in granules and partly in a biofilm under the conditions of long HRT and low upward liquid velocity. The anaerobic sludge age in the reactor was about 28 ± 2 days, which was larger than the values reported previously (Mendonca et al 2004). However, the long sludge retention time (SRT) was beneficial to the stability of the anaerobic treatment system.…”

Section: Anaerobic Biofilm and Granular Sludgementioning

confidence: 54%

Treatment of food processing wastewater in a full-scale jet biogas internal loop anaerobic fluidized bed reactor

et al. 2010

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A full-scale jet biogas internal loop anaerobic fluidized bed (JBILAFB) reactor, which requires low energy input and allows enhanced mass transfer, was constructed for the treatment of food processing wastewater. This reactor has an active volume of 798 m(3) and can treat 33.3 m(3) wastewater per hour. After pre-treating the raw wastewater by settling, oil separating and coagulation-air floating processes, the reactor was operated with a relatively shorter start-up time (55 days). Samples for the influent and effluent of the JBILAFB reactor were taken and analyzed daily for the whole process including both the start-up and stable running periods. When the volumetric COD loading fluctuated in the range of 1.6-5.6 kg COD m(-3) day(-1), the COD removal efficiency, the volatile fatty acid(VFA)/alkalinity ratio, the maximum biogas production and the content of CH(4) in total biogas of the reactor were found to be 80.1 ± 5%, 0.2-0.5, 348.5 m(3 )day(-1) and 94.5 ± 2.5%, respectively. Furthermore, the scanning electron microscope (SEM) results showed that anaerobic granular sludge and microorganism particles with biofilm coexisted in the reactor, and that the bacteria mainly in bacilli and cocci were observed as predominant species. All the data demonstrated that the enhanced mass transfer for gas, liquid and solid phases was achieved, and that the formation of microorganism granules and the removal of inhibitors increased the stability of the system.

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“…Fluidized-bed biofilm reactors (FBBR) have already been used widely for wastewater treatment [1,2,3]. Compared with activated sludge reactors and packed bed biofilm reactors, FBBR has many advantages such as high biomass concentration, no wash-out limitation on the liquid flow rate, no bed clogging, low external mass transfer resistance, and easy control of biofilm thickness with little disturbance to continuous operation [4].…”

Section: Introductionmentioning

confidence: 99%

Biofilm Performance in an Aerobic Fluidized Bed Reactor During the Start-Up Period

Zhou

Wang

2008

2008 2nd International Conference on Bioinformatics and Biomedical Engineering

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This study investigated the performance of an aerobic fluidized-bed biofilm reactor (AFBBR) at the start-up stage. By means of cultivating bacteria naturally in a growth culture medium that has similar ingredients as the feed water for the AFBBR reactor, the seeding bacteria solution with sufficient amount of lively and well-acclimated bacteria and very low suspended solid was obtained after 4 days cultivation and acclimation. AFBBR was quickly started up in 14 days after bacteria solution was seeded, achieving a COD removal efficiency of 82.3% for a synthetic wastewater of 220mg/L influent COD at Hydraulic Rentention Time (HRT) of 45min. Growth of biofilm thickness was tracked and the film thickness stabilized at 24±2 µm under steady state operating conditions. The course of biofilms formation was observed by an optical microscope. At the beginning, biofilm formed when some microorganisms attached onto the activated carbon particles irreversibly. As the biofilm grew and more metabolite accumulated on the particle surface, the whole particle became covered by the biofilm. Finally, mature biofilm formed and biofilm thickness growth slowed down due to the shear stress of flowing liquid. Both low liquid velocity and decreased nutrient concentration with bed height contributed to the variation of biofilm thickness of bioparticles. Bacillus was found to densely pack on the surface of the activated carbon particles, observed by SEM.

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Full scale fluidized bed anaerobic reactor for domestic wastewater treatment: performance, sludge production and biofilm

Cited by 11 publications

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Treatment of food processing wastewater in a full-scale jet biogas internal loop anaerobic fluidized bed reactor

Biofilm Performance in an Aerobic Fluidized Bed Reactor During the Start-Up Period

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