scholarly journals A novel anaerobic filter membrane bioreactor: prototype start-up and filtration assays

2018 ◽  
Vol 78 (9) ◽  
pp. 1833-1842 ◽  
Author(s):  
V. Diez ◽  
A. Iglesias ◽  
J. M. Cámara ◽  
M. O. Ruiz ◽  
C. Ramos
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Fixed Bed ◽  
Biomass Concentration ◽  
Organic Loading Rate ◽  
Cycle Duration ◽  
Concentrated Suspension ◽  
Efficient Treatment ◽  
Anaerobic Filter ◽  
Filter Membrane

Abstract Anaerobic digestion allows efficient treatment of high loaded wastewater, and membrane technology allows obtaining high quality effluents with complete biomass retention. However, high biomass concentration interferes with membrane fouling. In the present work, a new bioreactor that integrates an attached biomass anaerobic culture on a fixed bed and a submerged membrane has been started up. The recirculation between the digestion and filtration chambers is coupled to the gas-lift effect of the bubbling employed for the scouring of the membranes, avoiding the use or electromechanical pumps that damage the suspended biomass. The support material retains the biomass in the digestion tank despite the downwards flow, avoiding the submerged membrane contacting with a high concentrated suspension. This novel system, called an anaerobic filter membrane bioreactor was immediately started up, achieving chemical oxygen demand (COD) removal efficiencies of 96% at an organic loading rate (OLR) of 7 kg COD/m3·d. In order to select filtration flux, specific gas demand and filtration cycle duration, the results of 15 short term assays, eight hours for each one, is presented for fluxes between 15.7 and 17.7 L/m2·h, cycle duration between 10 and 30 minutes, and three levels of scouring. It was checked that reversible and irreversible fouling were directly related when dTMP/dt > 2.5 mbar/min.

Impact of Organic Loading Rate and DO on Filamentous Bulking Sludge and the Study of its Characteristics in Membrane Bioreactor

2010 ◽  
Vol 113-116 ◽  
pp. 1280-1284 ◽  
Author(s):  
Yu Tian ◽  
Xin Ying Su ◽  
Lin Chen ◽  
Tian Ling Jiang
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Loading Rate ◽  
Organic Loading Rate ◽  
Filamentous Bacteria ◽  
Organic Loading ◽  
High Substrate Concentration ◽  
Filamentous Bulking ◽  
And Control ◽  
The Impact

The membrane fouling behaviors and fouling mechanism of filamentous bulking sludge in membrane bioreactor (MBR) have been reported in recent studies. However, few studies have been conducted towards the causes and control of filamentous bulking sludge in MBR. In order to make clear the conditions of filamentous bacteria overgrowth in MBR, the impact of DO and organic loading rate on filamentous growth and its characteristics were investigated in this paper. The results showed that overgrowth of filamentous bacteria occurred under a relatively high substrate concentration (organic loading rate was 0.61 KgCOD/(KgMLSS•d), and DO was above 2 mg/L) in MBR. Nutrient removal effect can not be deteriorated under filamentous bulking sludge, with average 95, 57 and 92% removal efficiencies of COD, TN and TP respectively. The particle size of filamentous sludge was larger than that of normal sludge and the filamentous bacteria produced more SMP and EPS than floc forming bacteria.

scholarly journals Change of foulant concentration in an anaerobic membrane bioreactor

2020 ◽  
Author(s):  
Susumu Hasegawa ◽  
Genki Murakami ◽  
Ryosuke Takagi ◽  
Hideto Matsuyama
Keyword(s):  
Liquid Chromatography ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Loading Rate ◽  
Membrane Bioreactors ◽  
Organic Loading Rate ◽  
Organic Loading ◽  
Excess Sludge ◽  
Anaerobic Membrane Bioreactors ◽  
High Rejection

Abstract Anaerobic membrane bioreactors (AnMBRs) have many advantages, such as producing methane gas for energy generation and little excess sludge. However, membrane fouling is a serious problem because the foulant, which causes the membrane to foul, may get rejected by the membrane and accumulate in the reactor, resulting in an acceleration of membrane fouling. However, there is no information related to a change in the foulant concentration in an AnMBR. Therefore, we examined the changes in the foulant concentration in the reactor, related to membrane fouling in an AnMBR. For the influent, reactor solution, and effluent, the concentration of each component of the foulant was analyzed by using a liquid chromatography-organic carbon detector (LC-OCD). It was found that fouling in the AnMBR was closely related to the components in the reactor, and the main foulant of the ultrafiltration (UF) membrane was biopolymers (BPs). BP accumulated in the reactor because of a high rejection by the UF membrane. However, once the BP accumulated in the reactor was biodegraded, the concentration of BP decreased with time even under a high organic loading rate of 1.9kg TOC/m3/day.

Application of response surface methodology for investigation of membrane fouling behaviours in microalgal membrane bioreactor: the effect of aeration rate and biomass concentration

RSC Advances ◽  
2016 ◽  
Vol 6 (112) ◽  
pp. 111182-111189 ◽  
Author(s):  
Atefeh Alipourzadeh ◽  
Mohammad Reza Mehrnia ◽  
Ahmad Hallaj Sani ◽  
Azadeh Babaei
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Biomass Concentration ◽  
Aeration Rate ◽  
Submerged Membrane Bioreactor

This study was performed to investigate membrane fouling phenomena and to optimize fouling parameters in a submerged membrane bioreactor.

Development of a coarse membrane bioreactor for two-stage anaerobic digestion of biodegradable municipal solid waste

2009 ◽  
Vol 59 (4) ◽  
pp. 729-735 ◽  
Author(s):  
M. Walker ◽  
C. J. Banks ◽  
S. Heaven
Keyword(s):  
Municipal Solid Waste ◽  
Pore Size ◽  
Solid Waste ◽  
Methane Production ◽  
Large Scale ◽  
Membrane Bioreactor ◽  
Solid Substrate ◽  
Organic Loading Rate ◽  
Two Stage ◽  
Anaerobic Filter

A laboratory-scale coarse membrane bioreactor was developed to test its potential for the enhanced degradation of biodegradable municipal (solid) waste. The purpose of the mesh was to retain solid substrate and biomass in the reactor, promoting optimal degradation while also allowing intermediate soluble compounds to be removed and degraded in a second reactor. Three reactors with nylon woven mesh membranes of pore sizes 30, 100 and 140 μm were operated at a solid and liquid retention time of 20 and 1.5 days respectively and fed at an organic loading rate of 3.75 gVS l−1 d−1. Liquid effluent was fed to an anaerobic filter reactor. The total methane production for the two stage systems was very similar at 0.21–0.22 l g−1 VS added (c.f. 0.26 l g−1 VS added for BMP). The effect of increasing the pore size of the mesh was to reduce the methane production in the first stage and transfer more of this to the filter reactor, with the proportion of the total methane produced in the first stage changing from 72% to 49% between 30 and 140 μm meshes. The VS content of the first stage effluent also increased with pore size so it is likely that the mechanism for the differences in methane production is one of solids/biomass retention. The 30 μm pore size is recommended for further work since it transmitted a lower solid and soluble loading to the anaerobic filter. Solids accumulation in the second stage, although causing no problems in the 85-day operational period of this trial, could lead to blocking of the anaerobic filter, which is undesirable on a large scale.

Treatment of kraft evaporator condensate using a thermophilic submerged anaerobic membrane bioreactor

2010 ◽  
Vol 61 (9) ◽  
pp. 2177-2183 ◽  
Author(s):  
B. Q. Liao ◽  
K. Xie ◽  
H. J. Lin ◽  
Daniel Bertoldo
Keyword(s):  
Membrane Fouling ◽  
Membrane Bioreactor ◽  
Colloidal Particles ◽  
Fine Particles ◽  
Biogas Production ◽  
Cod Removal ◽  
Organic Loading Rate ◽  
Fuel Quality ◽  
Anaerobic Membrane Bioreactor ◽  
Treated Effluent

The feasibility of using a thermophilic submerged anaerobic membrane bioreactor (SAnMBR) for kraft evaporator condensate treatment was studied at 55 ± 1°C over 6.5 months. Under tested organic loading rate of 1–7 kg COD/m3 day, a soluble COD removal efficiency of 85–97% was obtained. The methane production rate was 0.35 ± 0.1 L methane/g COD and the produced biogas was of excellent fuel quality with 80–90% methane. A higher membrane fouling rate was related to the presence of a larger portion of fine colloidal particles (1–10 μm). The thermophilic SAnMBR was sensitive to the presence of toxic compounds in feed and unexpected pH probe failure (leading to a higher pH). Feed toxic shock caused sludge deflocculation and thus deteriorated membrane performance. Operating the reactor as a conventional anaerobic reactor to waste some of the fine flocs in treated effluent during the start-up process was an effective strategy to reduce membrane fouling. The experimental results from this study indicate that treatment of kraft evaporator condensate is feasible in terms of COD removal and biogas production using thermophilic SAnMBRs but pre-treatment may be needed to remove toxic sulfur compounds and membrane fouling caused by the large portion of fine particles may be a challenge.

scholarly journals Anaerobic membrane bioreactor for high-strength wastewater treatment: batch and continuous operation comparison

2015 ◽  
Vol 5 (2) ◽  
pp. 95-103 ◽  
Author(s):  
D. Hufnagel ◽  
S. Chang ◽  
Y. Hong ◽  
P. Wu ◽  
R. G. Zytner
Keyword(s):  
Membrane Filtration ◽  
Membrane Bioreactor ◽  
Biomass Concentration ◽  
High Strength ◽  
High Rate ◽  
Organic Loading Rate ◽  
Brewery Wastewater ◽  
Batch Operation ◽  
Anaerobic Membrane Bioreactor ◽  
Continuous Feeding

The anaerobic membrane bioreactor (AnMBR) is a recent development in high-rate anaerobic bioreactors. This study assessed the treatment of high-strength wastewater by an AnMBR using batch and continuous feeding operation. The results showed that the AnMBR could establish a biomass concentration of 6–8 g/L in approximately 20 days due to retention of micro-organisms by the membrane, resulting in 86% chemical oxygen demand (COD) removal efficiency in the treatment of high-strength brewery wastewater. Batch operation was proven to be effective for an organic loading rate (OLR) up to 2 gCOD/L/day and was beneficial to the membrane filtration. However, the treatment capacity of the AnMBR with batch feeding was limited by the high instantaneous OLR during the feeding period. Compared to batch operation, continuous feeding can achieve improved stability and better effluent quality, but prolonged continuous permeation may make the membrane more susceptible to fouling. Although a critical flux of 22 L/m2/h was determined for the membrane filtration in the AnMBR tested, a decrease in the membrane permeability was still observed in the long-term filtration at a flux of approximately 10 L/m2/h.

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