Performance and stability of an anaerobic fixed bed reactor subjected to progressive increasing concentrations of influent organic matter and organic shock loads

Amorim, Ariuska Karla Barbosa; Zaiat, Marcelo; Foresti, Eugênio

doi:10.1016/j.jenvman.2004.02.010

Cited by 21 publications

(9 citation statements)

References 3 publications

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“…173 Immobilized biomass has shown a better response to organic shock loads and toxic pollutants, and in many cases, reactors employing immobilized biomass completely recover their performance after deleterious occurrences. 5 Furthermore, immobilized microorganisms have been found to remain more active in starvation periods and revealed a shorter lag phase after introduction of a degradable compound. 68,162 This has been attributed to a better biomass retention and higher cell density in immobilized biomass reactors, 163,169 which is particularly important for slow growing organisms that perform the biodegradation of xenobiotic compounds.…”

Section: Bioreactor Considerations For the Treatment Of Highly Variabmentioning

confidence: 99%

Biotreatment of Industrial Wastewaters under Transient-State Conditions: Process Stability with Fluctuations of Organic Load, Substrates, Toxicants, and Environmental Parameters

Sipma

Osuna

Emanuelsson

et al. 2010

Critical Reviews in Environmental Science and Technology

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Biotreatment of industrial wastewater is often challenged by operation under transient states with respect to organic loads, pollutants, and physical characteristics. Furthermore, the potential presence of inhibitory compounds requires careful monitoring and adequate process design. This review describes difficulties encountered in biological treatment of wastewater with highly variable influent characteristics. Typical design aspects of biological processes are presented and discussed with respect to their success in treating highly fluctuating wastewaters. In general, biomass retention is a key factor for dealing with highly fluctuating and/or inhibitory wastewater, but the how it operates also affects the stability of performance, as it was shown that dynamic operation instead of operation at a constant flow enhances biodegradation onset and more evenly distributed activity. Although ultimately stable effluent quality must be achieved, the microbial population stability is not necessarily high, as it was shown that microbial diversity and flexibility may play a critical role in functional stability.

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Section: Bioreactor Considerations For the Treatment Of Highly Variabmentioning

confidence: 99%

Biotreatment of Industrial Wastewaters under Transient-State Conditions: Process Stability with Fluctuations of Organic Load, Substrates, Toxicants, and Environmental Parameters

Sipma

Osuna

Emanuelsson

et al. 2010

Critical Reviews in Environmental Science and Technology

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“…It has many advantages such as easy operation and maintenance, small area requirement, and lower sensitivity to fluctuation of influent loading as a consequence of higher concentration of biomass attached to the media. [5][6][7] In spite of their many advantages, however, clogging (i.e. increment of headloss) caused by biofilm growth in the reactor and accumulated solids are major drawbacks.…”

Section: Introductionmentioning

confidence: 99%

Integrated nitrogen removal biofilter system with ceramic membrane for advanced post-treatment of municipal wastewater

Son

Yun

Kim

et al. 2016

Environmental Technology

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The pre-denitrification biofilm process for nitrogen removal was combined with ceramic membrane with pore sizes of 0.05-0.1 µm as a system for advanced post-treatment of municipal wastewater. The system was operated under an empty bed hydraulic retention time of 7.8 h, recirculation ratio of 3, and transmembrane pressure of 0.47 bar. The system showed average removals of organics, total nitrogen, and solids as high as 93%, 80%, and 100%, respectively. Rapid nitrification could be achieved and denitrification was performed in the anoxic filter without external carbon supplements. The residual particulate organics and nitrogen in effluent from biofilm process could be also removed successfully through membrane filtration and the removal of total coliform was noticeably improved after membrane filtration. Thus, a system composed of the pre-denitrification biofilm process with ceramic membrane would be a compact and flexible option for advanced post-treatment of municipal wastewater.

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“…AMORIM et al (2005) concluded that there is a need for studies to determine the application limits of VOL for better utilization of useful volume of HAFBR, making it more economical. The half supporter contributes to the increase in the solid retention time, favoring the methanogenic population and, thus, increases the capacity of the horizontal reactor to resist organic shocks, changes in the characteristics of the substrate, and the presence of toxic compounds, but may also contribute to clogging of the reactor due to excessive retention of suspended solids (RODGERS et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Start-up of horizontal anaerobic reactors with sludge blanket and fixed bed for wastewater treatment from coffee processing by wet method

Oliveira

Bruno

2013

Eng. Agríc.

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ABSTRACT:In this study it was evaluated the start-up procedures of anaerobic treatment system with three horizontal anaerobic reactors (R1, R2 and R3), installed in series, with volume of 1.2 L each. R1 had sludge blanket, and R2 and R3 had half supporter of bamboo and coconut fiber, respectively. As an affluent, it was synthesized wastewater from mechanical pulping of the coffee fruit by wet method, with a mean value of total chemical oxygen demand (CODtotal) of 16,003 mg L -1 . The hydraulic retention time (HRT) in each reactor was 30 h. The volumetric organic loading (VOL) applied in R1 varied from 8.9 to 25.0 g of CODtotal (L d) -1 . The mean removal efficiencies of CODtotal varied from 43 to 97% in the treatment system (R1+R2+R3), stabilizing above 80% after 30 days of operation. The mean content of methane in the biogas were of 70 to 76%, the mean volumetric production was 1.7 L CH 4 (L reactor d) -1 in the system, and the higher conversions were around at 0.20 L CH 4 (g COD removed )-1 in R1 and R2. The mean values of pH in the effluents ranged from 6.8 to 8.3 and the mean values of total volatile acids remained below 200 mg L -1 in the effluent of R3. The concentrations of total phenols of the affluent ranged from 45 to 278 mg L -1 , and the mean removal efficiency was of 52%. The start-up of the anaerobic treatment system occurred after 30 days of operation as a result of inoculation with anaerobic sludge with active microbiota.KEYWORDS: volumetric organic loading, bamboo, methane, phenols, reactors in series. PARTIDA DE REATORES ANAERÓBIOS HORIZONTAIS COM MANTA DE LODO E DE LEITO FIXO PARA TRATAMENTO DE ÁGUAS RESIDUÁRIAS DO BENEFICIAMENTO DE FRUTOS DO CAFEEIRO POR

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Performance and stability of an anaerobic fixed bed reactor subjected to progressive increasing concentrations of influent organic matter and organic shock loads

Cited by 21 publications

References 3 publications

Biotreatment of Industrial Wastewaters under Transient-State Conditions: Process Stability with Fluctuations of Organic Load, Substrates, Toxicants, and Environmental Parameters

Biotreatment of Industrial Wastewaters under Transient-State Conditions: Process Stability with Fluctuations of Organic Load, Substrates, Toxicants, and Environmental Parameters

Integrated nitrogen removal biofilter system with ceramic membrane for advanced post-treatment of municipal wastewater

Start-up of horizontal anaerobic reactors with sludge blanket and fixed bed for wastewater treatment from coffee processing by wet method

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