Woven Fabric Bioreactor (WFBR) as the Filter Material for Wastewater Treatment

2011 ◽  
Vol 356-360 ◽  
pp. 1613-1617 ◽  
Author(s):  
Qi Yang ◽  
Zhen Hong Liu ◽  
Xia Sheng
Keyword(s):  
Wastewater Treatment ◽  
Membrane Filtration ◽  
Treatment Plant ◽  
Cost Effective ◽  
Filter Material ◽  
Membrane Bioreactors ◽  
Woven Fabric ◽  
Operational Conditions ◽  
Solids Retention ◽  
Solid Liquid

Conventional and modified membrane bioreactors (MBRs) are effective increasingly used in small sized wastewater treatment plant. However, their widespread applications are hindered by their elevated energy consumption and the high costs of investment for the membrane modules. In this study, we investigated a modified an improved MBR system that utilized a cost effective woven fabric instead of nonwoven as the filter material in MBR modules. The woven fabric bioreactor (WFBR) system was operated in a continuous mode at HRT from 33 to 12h. Under the operational conditions of BOD loading rates from 0.12 to 0.28 kg BOD/kg MLSS /d, the WFBR system was able to reduce up 93.57% COD. The 38μm woven fabric performed well in solid-liquid separator, with an average suspended solids retention of 99.47% at MLSS of 4710~9951 mg/L. The WFBR system eliminated suction pumping by using a gravity head in the membrane filtration of the effluent over the entire operational period of 60 d.

Cost effective and advanced phosphorus removal in membrane bioreactors for a decentralised wastewater technology

2003 ◽  
Vol 47 (12) ◽  
pp. 133-139 ◽  
Author(s):  
R. Gnirss ◽  
B. Lesjean ◽  
C. Adam ◽  
H. Buisson
Keyword(s):  
Phosphorus Removal ◽  
Membrane Filtration ◽  
Treatment Plant ◽  
Cost Effective ◽  
Membrane Bioreactors ◽  
P Adsorption ◽  
Bench Scale ◽  
Co Precipitation ◽  
Biological Phosphorus ◽  
P Removal

Future stringent phosphorus regulations (down to 50 mg/L in some cases) together with the availability of more cost effective and/or innovative membrane processes, are the bases for this project. In contrast to conventional activated sludge plants, process parameters are not optimised and especially enhanced biological phosphorus (Bio-P) removal in membrane bioreactors (MBRs) are not proven yet. Current practice of P-removal in MBRs is the addition of coagulants in a co-precipitation mode. Enhanced biological phosphorus removal, when adapted to MBR technology, might be a cost-effective process. For very stringent effluent criteria additional P-adsorption on activated clay after membrane filtration can be also an interesting solution. The objective of this research project is to identify and test various phosphorus removal processes or process combinations, including MBR technologies. This should enable us to establish efficient and cost effective P-removal strategies for upgrading small sewage treatment units (up to 10,000 PE), as needed in some decentralised areas of Berlin. In particular, enhanced Bio-P removal technology was developed and optimised in MBR. Combinations of co-precipitation and post-adsorption will be tested when low P-values down to 50 mg/L are required in the effluent. One MBR bench-scale plant of 200 to 250 L and two MBR pilot plants of 1 to 3 m3 each were operated in parallel to a conventional wastewater treatment plant (Ruhleben WWTP, Berlin, Germany). The MBR bench-scale and pilot plants were operated under sludge ages of respectively 15 and 25 days. In both cases, Bio-P was possible, and phosphorus effluent concentration of about 0.1 mg/L could be achieved. A similar effluent quality was observed with the conventional WWTP. Investigations with lab columns indicated that P-adsorption could lead to concentrations down to 50 mg/L and no particle accumulation occurred in the filter media. The three tested materials exhibited great differences in break-through curves. Granulated ferric hydroxyde (GEH®) showed higher capacity than activated alumina and FerroSorpPlus.

Comparison of different oxygen transfer testing procedures in full-scale membrane bioreactors

2003 ◽  
Vol 47 (12) ◽  
pp. 169-176 ◽  
Author(s):  
S. Krause ◽  
P. Cornel ◽  
M. Wagner
Keyword(s):  
Wastewater Treatment ◽  
Steady State ◽  
Oxygen Transfer ◽  
Membrane Filtration ◽  
Treatment Plant ◽  
Complete Removal ◽  
Membrane Bioreactors ◽  
Full Scale ◽  
Efficient Operation ◽  
Testing Procedures

Membrane bioreactors (MBRs) for wastewater treatment offer the advantage of a complete removal of solids from the effluent. The secondary clarifier is replaced by a membrane filtration and therefore high biomass concentrations (MLSS) in the reactor are possible. The design of the aeration system is vital for an energy efficient operation of any wastewater treatment plant. Hence the exact measurement of oxygen transfer rates (OTR) and α-values is important. For MBRs these values reported in literature differ considerably. The OTR can be measured using non-steady state methods or using the off-gas method. The non-steady state methods additionally require the determination of the respiration rate (oxygen uptake rate ≡ OUR), which usually is measured in lab scale units. As there are differences of OUR between lab scale and full scale measurements, off-gas tests (which do not require an additional respiration test) were performed in order to compare both methods at high MLSS concentrations. Both methods result in the same average value of OTR. Due to variations in loading and wastewater composition variations of OTR in time can be pointed out using the off-gas method. For the first time a comparison of different oxygen transfer tests in full scale membrane bioreactors is presented.

scholarly journals Niche Differentiation among Three Closely RelatedCompetibacteraceaeClades at a Full-Scale Activated Sludge Wastewater Treatment Plant and Putative Linkages to Process Performance

2018 ◽  
Vol 85 (5) ◽  
Author(s):  
Veronica R. Brand ◽  
Laurel D. Crosby ◽  
Craig S. Criddle
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Niche Differentiation ◽  
Full Scale ◽  
Pure Oxygen ◽  
Operational Parameters ◽  
Metabolic Potential ◽  
Operational Conditions

ABSTRACTMultiple clades within a microbial taxon often coexist within natural and engineered environments. Because closely related clades have similar metabolic potential, it is unclear how diversity is sustained and what factors drive niche differentiation. In this study, we retrieved three near-complete Competibacter lineage genomes from activated sludge metagenomes at a full-scale pure oxygen activated sludge wastewater treatment plant. The three genomes represent unique taxa within theCompetibacteraceae. A comparison of the genomes revealed differences in capacity for exopolysaccharide (EPS) biosynthesis, glucose fermentation to lactate, and motility. Using quantitative PCR (qPCR), we monitored these clades over a 2-year period. The clade possessing genes for motility and lacking genes for EPS biosynthesis (CPB_P15) was dominant during periods of suspended solids in the effluent. Further analysis of operational parameters indicate that the dominance of the CPB_P15 clade is associated with low-return activated sludge recycle rates and low wasting rates, conditions that maintain relatively high levels of biomass within the system.IMPORTANCEMembers of the Competibacter lineage are relevant in biotechnology as glycogen-accumulating organisms (GAOs). Here, we document the presence of threeCompetibacteraceaeclades in a full-scale activated sludge wastewater treatment plant and their linkage to specific operational conditions. We find evidence for niche differentiation among the three clades with temporal variability in clade dominance that correlates with operational changes at the treatment plant. Specifically, we observe episodic dominance of a likely motile clade during periods of elevated effluent turbidity, as well as episodic dominance of closely related nonmotile clades that likely enhance floc formation during periods of low effluent turbidity.

scholarly journals Efficiency of municipal wastewater treatment with membrane bioreactor

2019 ◽  
Vol 41 (1) ◽  
pp. 47-54
Author(s):  
Magdalena Domańska ◽  
Anna Boral ◽  
Kamila Hamal ◽  
Magdalena Kuśnierz ◽  
Janusz Łomotowski ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Membrane Filtration ◽  
Municipal Wastewater ◽  
High Efficiency ◽  
Biological Membrane ◽  
Treatment Plant ◽  
Membrane Reactors ◽  
Quality Analysis ◽  
Treated Wastewater ◽  
Municipal Wastewater Treatment

AbstractThe increasingly stringent requirements for wastewater treatment enforce the adoption of technologies that reduce pollution and minimize waste production. By combining the typical activated sludge process with membrane filtration, biological membrane reactors (MBR) offer great technological potential in this respect. The paper presents the principles and effectiveness of using an MBR at the Głogów Małopolski operation. Physicochemical tests of raw and treated wastewater as well as microscopic analyses with the use of the FISH (fluorescence in situ hybridization) method were carried out. Moreover, the level of electric energy consumption during the operation of the wastewater treatment plant and problems related to fouling were also discussed. A wastewater quality analysis confirmed the high efficiency of removing organic impurities (on average 96% in case of BOD5 and 94% in case of COD) and suspension (on average 93%).

Study of Continuos Settling Vessels Operating with Suspensions Previously Floculated

2008 ◽  
Vol 591-593 ◽  
pp. 358-361
Author(s):  
J.F. Nunes ◽  
J.R. Lira ◽  
João Jorge Ribeiro Damasceno
Keyword(s):  
Wastewater Treatment ◽  
Solid Particle ◽  
Aluminum Sulfate ◽  
Cylindrical Part ◽  
Continuous Operation ◽  
Circular Section ◽  
Operational Conditions ◽  
The Stability ◽  
Solid Liquid ◽  
Solid Liquid Separation

The settling vessels are equipment destined to solid-liquid separation; usually have continuous operation, with a circular section, presenting one conic and one cylindrical part. They are very used in chemical industries: wastewater treatment, minerals industries; to concentrate or to remove the solids. The solid particle splitting with small granular becomes difficult through the operation of conventional sedimentation. An expedient very used in the industry is the flocculant substance addition, whose objective is to promote the precipitation of particles, with decantation speed is upper than the single one. The present work aim the study of the burst operational conditions that influence the formation and the stability of these aggregates, the flake, the effect of pH and the concentration of flocculant using kaolin suspension and genfloc, that contains aluminum sulfate, as a flocculant; and the capacity of conventional settling vessel, which area of the transversal remains constant, considering this operational conditions.

Organic colloids and their influence on low-pressure membrane filtration

2004 ◽  
Vol 50 (12) ◽  
pp. 311-316 ◽  
Author(s):  
C. Laabs ◽  
G. Amy ◽  
M. Jekel
Keyword(s):  
Wastewater Treatment ◽  
Glass Fiber ◽  
Membrane Filtration ◽  
Membrane Surface ◽  
Treatment Plant ◽  
Low Pressure ◽  
Colloidal Solutions ◽  
Cake Layer ◽  
Stirred Cell ◽  
Macromolecular Component

Wastewater treatment by low-pressure membrane filtration (MF and UF) is affected to a large extent by macromolecules and colloids. In order to investigate the influence of organic colloids on the membrane filtration process, colloids were isolated from a wastewater treatment plant effluent using a rotaryevaporation pre-concentration step followed by dialysis. Stirred cell tests were carried out using redissolved colloids, with and without additional glass fiber filtration. After constant pressure membrane filtration of 190 L/m2, the initial flux had declined by 50% for colloids > 6-8 kD (glass fiber filtered) with a hydrophilic MF membrane and for colloids >12-14 kD (glass fiber filtered) with a hydrophobic MF membrane. For the non-filtered colloidal solutions, the flux decline was even steeper with the flux being below 10% of the initial flux after 190 L/m2 were passed through the membranes. As with larger particles, colloids form a filtration cake layer on top of the membrane surface when used as isolates without prior filtration. This filtration cake is easily removed during backwashing. However, polysaccharides as a macromolecular component of the colloid isolate cause severe fouling by the formation of a gel layer on the membrane surface that is difficult to remove completely.

scholarly journals Brief review of operation of anaerobic wastewater treatment with membrane bioreactors

2019 ◽  
Vol 86 ◽  
pp. 00020
Author(s):  
Zbigniew Mucha ◽  
Włodzimierz Wójcik ◽  
Michał Polus
Keyword(s):  
Wastewater Treatment ◽  
Energy Demand ◽  
Membrane Filtration ◽  
Membrane Bioreactor ◽  
Municipal Wastewater ◽  
Anaerobic Treatment ◽  
Membrane Bioreactors ◽  
Current Status ◽  
Municipal Wastewater Treatment ◽  
Anaerobic Membrane Bioreactor

In recent years, anaerobic membrane bioreactor (AnMBR) technology has been considered as a very appealing alternative for wastewater treatment due to its significant advantages over conventional anaerobic treatment and aerobic membrane bioreactor (MBR) technology. The paper provides an overview of the current status of the anaerobic membrane bioreactor technology with a special emphasis on its performance and drawbacks when applied for domestic and municipal wastewater treatment. According to the reported data, the renewable energy produced at the plants (i.e. from methane) covered the energy demand for membrane filtration while the excess energy can be further utilized. Anaerobic membrane bioreactors are an attractive technology that needs further research efforts and applications at an industrial scale.

Control of Activated Sludge Bulking: From the Lab to the Plant

1989 ◽  
Vol 21 (6-7) ◽  
pp. 717-726 ◽  
Author(s):  
R. Pujol ◽  
P. Boutin
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Common Type ◽  
Test Method ◽  
Mixing Zone ◽  
Operational Conditions ◽  
Sludge Bulking ◽  
Technical Aid

Activated sludge bulking often occurs in French wastewater treatment plants. Precise identification of filaments and better knowledge of their ecophysiology helped to clarify their re1ations with the operational conditions of plants. Effective techniques were therefore developed for control. The “mixing zone” is suitable for many cases of bulking ocurring in extended aeration plants (the most common type in France). A test method was developed to provide the elements for dimensioning the system. Unreserved cooperation between the owner of the plant, the manager, the SATESE (Service of technical aid to wastewater treatment plant managers) and specialized laboratories is required to implement such measures. Some cases, about which CEMAGREF was consulted, were examined; three of them are detailed and reasons for success or fai1ure are analysed. Seeking funds for the works too often leads to excessive delays.

Introduction of membrane technologies at the wastewater treatment facilities of Molodezhnoe settlement

2021 ◽  
pp. 26-32
Author(s):  
В.А. Кузьмин ◽  
О.А. Ломинога ◽  
Е.Г. Колоскова
Keyword(s):  
Wastewater Treatment ◽  
Membrane Filtration ◽  
Colloidal Particles ◽  
High Efficiency ◽  
Treatment Plant ◽  
Phosphorus Compounds ◽  
Design Parameters ◽  
Aeration Tank ◽  
Membrane Unit ◽  
Treatment Facilities

Представлен опыт внедрения технологии мембранной очистки сточных вод на канализационных очистных сооружениях поселка Молодежное (Санкт-Петербург). В состав очистных сооружений входят: главная насосная станция, комбинированная установка механической очистки сточных вод, усреднитель, биореактор (аэротенк, работающий по технологии нитри-денитрификации) для глубокого удаления азота, мембранный биореактор, установка ультрафиолетового обеззараживания сточных вод, шнековый пресс обезвоживания избыточного активного ила, станция дозирования реагента сульфата алюминия для химического удаления фосфорных соединений (фосфатов). Очищенные и обеззараженные сточные воды сбрасываются через глубоководный выпуск в Финский залив. Мембранная фильтрация обеспечивает глубокую доочистку от мелкодисперсных взвешенных веществ и коллоидных частиц. Для достижения стабильного качества очищенных сточных вод при эксплуатации мембранных модулей необходимо строго выполнять следующие требования: высокая эффективность удаления отбросов на решетках; предотвращение попадания посторонних включений в биореактор после механической очистки; обеспечение высокой концентрации ила в аэротенке и мембранном блоке; своевременная химическая промывка мембран. В ходе опытной эксплуатации очистных сооружений пос. Молодежное была отмечена неравномерность нагрузки как гидравлической, так и по загрязняющим веществам. За период эксплуатации были отлажены режимы работы станции с учетом неравномерности характеристик поступающего стока с выходом на проектные параметры технологической линии очистки сточных вод. The experience of introducing membrane wastewater treatment technology at the wastewater treatment facilities in Molodezhnoe settlement (St. Petersburg) is presented. The treatment facilities include: a main pumping station, a combined mechanical wastewater treatment plant, a wastewater regulator, a bioreactor (aeration tank operating using nitri-denitrification technology) for enhanced nitrogen removal, a membrane bioreactor, an ultraviolet effluent disinfection unit, a screw press for excess activated sludge dewatering, aluminum sulfate dosing unit for the chemical removal of phosphorus compounds (phosphates). The effluent after disinfection is discharged through a deep-water outlet into the Gulf of Finland. Membrane filtration provides for the enhanced tertiary treatment to remove fine suspended solids and colloidal particles. To achieve a stable quality of the effluent during the operation of membrane modules, the following requirements shall be strictly met: the high efficiency of screenings removal; prevention of the ingress of foreign particles into the bioreactor after mechanical treatment; high concentration of sludge in the aeration tank and membrane unit; timely chemical washing of the membranes. During the trial operation of the treatment facilities in Molodezhnoe, the irregular hydraulic and pollution loading was noted. During the operation period the operating modes of the facilities were adjusted with account of the irregular characteristics of the incoming flow while achieving the design parameters of the process line of wastewater treatment.

Sign in / Sign up

Export Citation Format

Share Document