Oxygen transfer in membrane bioreactors treating synthetic greywater

Henkel, J.; Lemac, Mladen; Wagner, Martin; Cornel, Peter

doi:10.1016/j.watres.2009.01.011

Cited by 45 publications

(26 citation statements)

References 19 publications

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“…• Increase in K L × α due to the reduction in liquid viscosity [48][49][50][51][52][53][54] and the lower content of organic substances [6], which substantially affect the composition of the mixed liquor in the biological reactor and, therefore, the oxygen transferred [55][56][57].…”

Section: Step 3 Equipment Redesignmentioning

confidence: 99%

Methodology for Energy Optimization in Wastewater Treatment Plants. Phase II: Reduction of Air Requirements and Redesign of the Biological Aeration Installation

Avilés¹,

Velázquez

Lloréns

2020

Water

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Phase I of the proposed energy optimization methodology showed how the selection of best management criteria for the biological aeration process, and the guarantee of its control at the wastewater treatment plant (WWTP) in San Pedro del Pinatar (Murcia, Spain) produced reductions of around 20% in energy consumption by considerably reducing the oxygen needs of the microorganisms in the biological system. This manuscript focused on phase II of this methodology, which describes the tools that can be used to detect and correct deviations in the optimal operating points of the aeration equipment and the intrinsic deficiencies in the installation, in order to achieve optimization of the oxygen needs by the microorganisms and improve the efficiency of their transfer from the gas phase to the liquid phase. The objectives pursued were: (i) to minimize the need for aeration, (ii) to reduce the pressure losses in the installation, (iii) to optimize the air supply pressures to avoid excessive energy consumption for the same airflow, and (iv) to optimize the control strategy for the actual working conditions. The use of flow modeling and simulation techniques, the measurement and calculation of air transfer efficiency through the use of off-gas hoods, and the redesign of the aeration facility at the San Pedro del Pinatar WWTP were crucial, and allowed for reductions in energy consumption in Phase II of more than 20%.

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Section: Step 3 Equipment Redesignmentioning

confidence: 99%

Methodology for Energy Optimization in Wastewater Treatment Plants. Phase II: Reduction of Air Requirements and Redesign of the Biological Aeration Installation

Avilés¹,

Velázquez

Lloréns

2020

Water

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“…The aeration energy (AE -kWh d -1 ) consumed is calculated from this coefficient according to an empirical formula. Using the equations of BSM1 for BSM-MBR would overlook the pivotal negative influence of elevated sludge concentrations, which is paramount in MBR systems, on oxygen transfer efficiency (Henkel et al, 2009). For this reason, and to allow differentiation between coarse and fine bubble aeration, a more fundamental and extensive aeration model was adopted, combining several literature findings (Germain et al, 2007;Judd and Judd, 2010;Stenstrom and Rosso, 2008;Tchobanoglous et al, 2003;Verrecht et al, 2008):…”

Section: Insert Figure 1: Bsm-mbr Layout and Flow Schemementioning

confidence: 99%

BSM-MBR: A benchmark simulation model to compare control and operational strategies for membrane bioreactors

et al. 2011

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A benchmark simulation model for membrane bioreactors (BSM-MBR) was developed to evaluate operational and control strategies in terms of effluent quality and operational costs. The configuration of the existing BSM1 for conventional wastewater treatment plants was adapted using reactor volumes, pumped sludge flows and membrane filtration for the water-sludge separation. The BSM1 performance criteria were extended for an MBR taking into account additional pumping requirements for permeate production and aeration requirements for membrane fouling prevention. To incorporate the effects of elevated sludge concentrations on aeration efficiency and costs a dedicated aeration model was adopted. Steady-state and dynamic simulations revealed BSM-MBR, as expected, to out-perform BSM1 for effluent quality, mainly due to complete retention of solids and improved ammonium removal from extensive aeration combined with higher biomass levels. However, this was at the expense of significantly higher operational costs. A comparison with three large-scale MBRs showed BSM-MBR energy costs to be realistic. The membrane aeration costs for the open loop simulations were rather high, attributed to non-optimization of BSM-MBR. As proof of concept two closed loop simulations were run to demonstrate the usefulness of BSM-MBR for identifying control strategies to lower operational costs without compromising effluent quality.

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“…Alpha factors as low as 0.1 were reported at a 20 g L -1 MLSS concentration demonstrating an extremely low OTE at the evaluated conditions. A study conducted by Henkel et al (2009) investigated the OTE of fine and coarse bubble diffusers at MLSS concentrations ranging from 4.7 to 19.5 g L -1 under different air flow conditions and operating the biological systems at high SRTs. A decrease on the alpha factor was reported as the biomass concentrations (expressed as MLSS) increased.…”

Section: Introductionmentioning

confidence: 99%

Assessing the performance of an MBR operated at high biomass concentrations

Barreto

García

Hooijmans

et al. 2017

International Biodeterioration & Biodegradation

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Reducing the footprint requirements of membrane bioreactors (MBR)s can both decrease the surface area needs for new wastewater treatment plants (WWTP)s, and increase the treatment capacities of existing WWTPs at a given surface area. In addition, it may promote the development of movable/portable containerized MBRs for a diverse range of wastewater treatment applications. Applications may include the provision of municipal/industrial wastewater treatment in remote areas without sewerage, and the provision of sanitation services under challenging site-specific conditions such as after the occurrence of a humanmade or a natural disaster. The reduction of the footprint requirements of MBRs is constrained by the maximum amount of biomass that can be accommodated in the aerobic basin. The biomass concentration is mainly limited by the extremely low oxygen transfer efficiency (OTE) experienced by conventional aeration bubble diffuser systems at mixed liquor total suspended solids (MLSS) concentrations higher than 20 g L-1. Another potential limitation for the operation of MBRs at such high MLSS concentrations is the reduction on the membrane permeability due to excessive fouling. A pilot MBR with a treatment capacity of one m³ d-1 was installed at the research hall facilities at the Harnaschpolder wastewater treatment plant in Delft, The Netherlands. The MBR was operated at MLSS concentrations of up to 28 g L-1 at sludge retention times (SRT)s ranging from 30 to 35 days. The MBR was provided with a Speece cone concentrated oxygen delivery system to overcome the oxygen transfer limitations of conventional bubble diffuser aeration systems at high MLSS concentrations. The MBR performance was evaluated by monitoring the influent and effluent

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Oxygen transfer in membrane bioreactors treating synthetic greywater

Cited by 45 publications

References 19 publications

Methodology for Energy Optimization in Wastewater Treatment Plants. Phase II: Reduction of Air Requirements and Redesign of the Biological Aeration Installation

Methodology for Energy Optimization in Wastewater Treatment Plants. Phase II: Reduction of Air Requirements and Redesign of the Biological Aeration Installation

BSM-MBR: A benchmark simulation model to compare control and operational strategies for membrane bioreactors

Assessing the performance of an MBR operated at high biomass concentrations

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