Simultaneous loading and draining as a means to enhance efficacy of sequencing biofilm batch reactors

Arnz, P.; Esterl, S.; Nerger, Christian; Delgado, Antonio; Wilderer, P.A.

doi:10.1016/s0043-1354(99)00318-8

Cited by 18 publications

(9 citation statements)

References 1 publication

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“…As a consequence, the kinetics of the removal process are conditioned by the values selected for the fill duration, the influent flow rate and the VER. According to Arnz et al (2000), in the case of xenobiotic compounds, near 68% of the reactor liquid can be exchanged if the concentration of pollutants introduced with the incoming wastewater must to be kept very low in order to avoid inhibiting phenomena. Besides, high exchange ratio grants the operators of the plant a high flexibility concerning the treatment goals.…”

Section: Methodsmentioning

confidence: 99%

Remediation of chlorophenol- and phenol-contaminated groundwater by a sequencing batch biofilm reactor

Farabegoli

Chiavola

Rolle

2008

Water Science and Technology

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The paper describes the results of an investigation aimed at evaluating suitability of a lab-scale Sequencing Batch Biofilm Reactor (SBBR) for the remediation of groundwater contaminated by phenol (P) and 2-chlorophenol (2-CP). Kinetics of compound degradation was determined along the bed height in the absence and in presence of effluent recirculation, and with different influent composition (compounds fed separately or in combination in the same stream). SBBR performances with and without recirculation were very satisfactory for all the influent compositions: the system showed 99% removal efficiencies for both phenol and 2-CP and their complete removal was always achieved far before the end of react. In the presence of recirculation, the concentration gradient established during fill was rapidly eliminated and an even biomass distribution along the bed height was formed. Consequently, an acceleration of the elimination process was observed, particularly for phenol that was mostly removed in the first hour of the cycle. When the compounds were fed simultaneously, 2-CP removal kinetics improved probably due to cometabolism. The adsorption phenomena of the toxic compounds on the packing material were studied also, showing about 50% COD removal after 7 hours contact time.

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Section: Methodsmentioning

confidence: 99%

Remediation of chlorophenol- and phenol-contaminated groundwater by a sequencing batch biofilm reactor

Farabegoli

Chiavola

Rolle

2008

Water Science and Technology

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“…Application-wise, a fill/draw phase (Arnz et al, 2000) may safely be implemented in granular sludge SBRs. Plug-flow hydraulic transport occurs in the supernatant section above the bed, indicating no mixing with the raw influent wastewater.…”

Section: The Raw Influent Wastewater Does Not MIX With the Supernatanmentioning

confidence: 99%

“…Lag times of 3.3 and 32 min were measured between the two sensors under rapid and slow regimes, respectively. Application-wise, a fill/draw phase (Arnz et al, 2000) may safely be implemented in granular sludge SBRs. Here, such a phase can last 1.25 Â HRT inside the bed without release of inlet wastewater in the effluent of the column system (geometrical ratios are here:…”

Section: The Raw Influent Wastewater Does Not MIX With the Supernatanmentioning

confidence: 99%

Modeling hydraulic transport and anaerobic uptake by PAOs and GAOs during wastewater feeding in EBPR granular sludge reactors

Weissbrodt

Holliger

Morgenroth

2017

Biotech & Bioengineering

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New-generation bioprocesses using granular sludge aim for a high-rate removal of nutrients from wastewater with low footprint. Achieving enhanced biological phosphorus removal (EBPR) relies on the design of sludge beds and wastewater feeding conditions to optimally load the biomass and to select for polyphosphate- (PAOs) over glycogen-accumulating organisms (GAOs) and over other heterotrophs. A hydraulic-metabolic mathematical model was developed to elucidate the impact of hydraulic transport patterns and environmental conditions on the PAO/GAO competition during up-flow feeding through an EBPR granular sludge bed. Tracer experiments highlighted plug-flow regimes with dispersion under both rapid (9 m h , Re = 1.6, Pe = 7.2, Pe = 4.6) and slow (0.9 m h , Re = 0.2, Pe = 21.3, Pe = 3.4) feeding. Non-turbulent regimes (Re << 10 ) promote a safe implementation of simultaneous fill/draw. Feeding time, pH, and temperature significantly impacted bacterial competition for carbon uptake under anaerobic slow feeding. Feeding duration should be designed to avoid full depletion of intracellular storage polymers within static granules. PAOs bear twice longer feeding than GAOs by using both polyphosphate and glycogen hydrolysis to sustain anaerobic C-uptake. Alkaline conditions (pH 7.25-8.0) by, e.g., dosing lime in the feed select for PAOs independently of temperature (10-30°C). A twice higher bed is required for full anaerobic conversions at 10 rather than 20°C. Biosystem responses for anaerobic C-uptake can be anticipated using the model toward designing robust anaerobic selectors to manage the microbial resource in EBPR granular sludge. Biotechnol. Bioeng. 2017;114: 1688-1702. © 2017 Wiley Periodicals, Inc.

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“…In conventional activated sludge, the sedimentation is performed in a separate tank, while in the SBR system, the sedimentation is performed in the same tank. Moreover, in an SBR reactor, the volume varies with time; however, it remains constant in the conventional continuous flow systems . The sequencing system has many advantages: it is easy to operate; it is cost effective (this system can save more than 60% of the operating costs required for conventional activated sludge); the system is flexible; it has a very simple physical structure; and there is no need for sludge recycling .…”

Section: Introductionmentioning

confidence: 99%

“…After these have been resolved, the process can be operated at significantly higher organic loading rates (OLR). Furthermore, bio‐film systems with supported biomass are especially useful for overcoming the high hydraulic loading fluctuations that can occur . The support material is a decisive factor that determines the maintenance of microorganism capacity and the attachment phenomenon in the reactor.…”

Section: Introductionmentioning

confidence: 99%

Organic matter removal under high loads in a fixed‐bed sequencing batch reactor with peach pit as carrier

Soltani

Rezaee

Godini

et al. 2012

Env Prog and Sustain Energy

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In this study, the evaluation of organic matter removal at high loads from synthetic wastewater was performed using a Fixed‐bed Sequencing Batch Reactor (FSBR), in which peach pits were used instead of conventional carriers. The FSBR performance on organic matter removal at different organic loading rates (2–12 kg COD m−3 d−1) was significant. Organic matter removal efficiency was >90% at a loading rate less than 7.2 kg COD m−3 d−1. When the organic loading was 12 kg COD m−3 d−1, organic matter removal in the FSBR and SBR reactors reached 71.84 and 56.57%, respectively, indicating that the FSBR performance is significantly higher than the SBR reactor. According to the higher efficiency of SBR with media, this comparison shows that bio‐film bioactivity (7.06 ± 0.3 mg O2 mg‐VSS−1 d−1) is significantly higher than suspended biomass bioactivity (2.92 ± 0.149 mg O2 mg‐VSS−1 d−1). As the OLR increased from 3.4 to 10 kg COD m−3 d−1, the observed yield (Yobs), the specific biomass growth rate (μoveral) and the endogenous decay rate (kd) increased from 0.018 to 0.02 g VSS g−1 COD−1, 0.1 to 0.2 d−1, and from 0.082 to 0.067 d−1, respectively, while the solid retention time (SRT) decreased from 40 to 19.8 d. © 2012 American Institute of Chemical Engineers Environ Prog, 32: 681–687, 2013

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Simultaneous loading and draining as a means to enhance efficacy of sequencing biofilm batch reactors

Cited by 18 publications

References 1 publication

Remediation of chlorophenol- and phenol-contaminated groundwater by a sequencing batch biofilm reactor

Remediation of chlorophenol- and phenol-contaminated groundwater by a sequencing batch biofilm reactor

Modeling hydraulic transport and anaerobic uptake by PAOs and GAOs during wastewater feeding in EBPR granular sludge reactors

Organic matter removal under high loads in a fixed‐bed sequencing batch reactor with peach pit as carrier

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