Pilot-Study of Micro-Polluted Water Treatment by UF Membrane at Different Fluxes

2013 ◽  
Vol 448-453 ◽  
pp. 1197-1201
Author(s):  
Shu Lu ◽  
Xing Li ◽  
Jian Yu Tian
Keyword(s):  
Working Conditions ◽  
Membrane Fouling ◽  
Pilot Scale ◽  
Polluted Water ◽  
Raw Water ◽  
Critical Flux ◽  
Membrane Flux ◽  
Study Results ◽  
Pollutants Removal ◽  
Better Than

A pilot-scale ultrafiltration (UF) experiment was conducted to determine the effect of membrane flux on pollutants removal performance and membrane fouling. The study results showed that with the increase of the membrane flux (20, 30 and 40 LMH respectively), the removal of turbidity, CODMnand UV254were slightly decreased. Every 10 LMH more flux increased, the UV254removal was reduced double. The growth rate of the trans-membrane pressure (TMP) became faster when the membrane flux increased, and 20 LMH could be considered as the critical flux in the raw water quality and working conditions. Membrane fouling rate could be delayed by air bubbling and backwashing. The larger the membrane flux was, the more TMP could be reduced. Furthermore, the effect of delaying the membrane fouling by backwashing was better than by air bubbling.

Performance and membrane fouling in a pilot scale SBR process coupled with membrane

2003 ◽  
Vol 47 (1) ◽  
pp. 139-144 ◽  
Author(s):  
H. Shin ◽  
S. Kang
Keyword(s):  
Membrane Fouling ◽  
Batch Reactor ◽  
Pilot Scale ◽  
Nitrifying Bacteria ◽  
Endogenous Respiration ◽  
Aeration Time ◽  
Membrane Flux ◽  
Start Up ◽  
Cell Test ◽  
Stirred Cell

The performance of the pilot-scale submerged membrane coupled with sequencing batch reactor (SM-SBR) for upgrading effluent quality was investigated in this study. The reactor was operated with 3-hour cycle with alternating anoxic and aerobic conditions to treat organics, nitrogen and phosphate. Despite various influent characteristics, COD removal was always higher than 95%. Sufficient nitrification was obtained within a few weeks after start-up and during the stable period, complete nitrification occurred despite short aeration time. Total nitrogen (TN) removal efficiency was reached up to 85%. Membrane flux was critical for TN removal so that the decrease of flux by membrane fouling led to increase of HRT, and it caused the endogenous respiration of microorganisms such as nitrifying bacteria. The stirred cell test revealed the significant role of the soluble fraction in membrane permeability and dissolved solids played a major role in the short-term fouling mechanism. The cake resistance by the soluble COD fraction of supernatant or soluble microbial products (SMP) was investigated as a major part of total resistance.

Comparative investigation on the impact of polymeric substances on membrane fouling during sub-critical and critical flux operation of a municipal membrane bioreactor

2008 ◽  
Vol 58 (9) ◽  
pp. 1849-1855 ◽  
Author(s):  
S. Lyko ◽  
T. Wintgens ◽  
T. Melin
Keyword(s):  
Membrane Fouling ◽  
Pilot Scale ◽  
Comparative Investigation ◽  
Hollow Fibre ◽  
Size Exclusion ◽  
Dominant Factor ◽  
Permeate Flux ◽  
Critical Flux ◽  
Operational Conditions ◽  
The Impact

Soluble organic macromolecules are ubiquitous in activated sludge supernatant. For the operation of membrane bioreactors (MBR) this group of substances is considered as the dominant factor causing severe membrane fouling due to the concentration polarisation phenomenon. The well established critical flux concept for the characterisation of membrane bioreactor's operation limits is based on filtration data only. As there is an cause-and-effect relation between the partial retention of organic compounds and the limited flux according the critical flux concept the aim of this study was to draw a comparison between different permeate fluxes on the retention of organic macromolecules. Thus, a municipal pilot-scale MBR with three capillary hollow fibre membrane modules was operated in sub critical, critical and supercritical flux mode, respectively and the retention of macromolecules was quantified by size exclusion chromatography. Three permeate extraction pumps allow a simultaneous operation with different operational conditions for each membrane module and proved the crucial impact of permeate flux on the fouling rate. The interchange of these conditions gave evidence of an optimised start-up procedure for MBRs characterised by higher permeate fluxes. An increased flux causes both a higher retention of soluble macromolecules and subsequent a higher fouling rate.

Performance of SIDMBR for Emulsified Oil Wastewater Treatment

2013 ◽  
Vol 448-453 ◽  
pp. 478-481
Author(s):  
Zhi Yong Han ◽  
Si Su ◽  
Yan Lu ◽  
Wang Bing Du
Keyword(s):  
Wastewater Treatment ◽  
Membrane Fouling ◽  
Extracellular Polymeric Substances ◽  
Oxygen Demand ◽  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Dynamic Membrane ◽  
Emulsified Oil ◽  
Membrane Flux ◽  
Oil Wastewater

The Sequencing Inclined Dynamic Membrane Biological Reactor (SIDMBR) was investigated on a pilot scale for 60 days of emulsified oil wastewater treatment at zero excess sludge discharge. Results indicate that at hydraulic retention time of 24 h, the average removals of chemical oxygen demand (COD), ammonia nitrogen and oil are 66.83, 64.2 and 70.8% in 1~60 days, respectively. The membrane flux, biofilm quantity, and extracellular polymeric substances (EPS) content begin to change after 20th, which indicate that membrane fouling has occurred.

Pilot-Scale Study on Treatment of High-Algae and Low-Turbidity Source Water by Air Flotation in South China

2011 ◽  
Vol 255-260 ◽  
pp. 2686-2690
Author(s):  
Gui Qing Gao ◽  
Hai Yan Ju ◽  
Du Wang Li
Keyword(s):  
Water Treatment ◽  
South China ◽  
Removal Rate ◽  
Pilot Scale ◽  
Polluted Water ◽  
Source Water ◽  
Raw Water ◽  
Reservoir Water ◽  
Air Flotation ◽  
Scale Experiment

The pilot-scale experiment of air flotation was carried out for reservoir water treatment of Shenzhen in order to provide reference for waterplant. The results show the turbidity of raw water is higher or lower than 15NTU, the optimum dosage of poly aluminum chloride (PAC) is 1.65mg/L and 1.25mg/L respectively. When the turbidity of raw water is between 3NTU and 32NTU, the amount of algae is less than 1.08×107unit/L, the removal rate of air flotation for turbidity and algae is 89.3% and 92.7% respectively; besides, the average removal rate of air flotation on CODMn is 32.6%, 21.2% of TOC is removed at least. Air flotation has preferable treatment effect on high–algae and low-turbidity water, adapts to treat micro-polluted water in South China.

Immersed membranes activated sludge process applied to the treatment of municipal wastewater

1998 ◽  
Vol 38 (4-5) ◽  
pp. 437-442 ◽  
Author(s):  
Pierre Côté ◽  
Hervé Buisson ◽  
Matthieu Praderie
Keyword(s):  
Activated Sludge ◽  
Membrane Filtration ◽  
Municipal Wastewater ◽  
Pilot Scale ◽  
Activated Sludge Process ◽  
Hybrid Techniques ◽  
Membrane Flux ◽  
Aeration Conditions ◽  
New Generation ◽  
Better Than

An immersed membrane activated sludge process has been evaluated at pilot scale by Anjou Recherche. This process represents a new generation of hybrid techniques, which aims at coupling biological treatment and membrane filtration functions, in a configuration adapted to the treatment of municipal wastewater. The process was evaluated under extended aeration conditions, but with concentrations of biomass of between 15 to 25 gMLSS/l, which corresponded to volumetric loadings of between 1.2 to 2.3 kg COD/m3/d. Under these conditions, COD and TKN removal were better than 96% and 95%, respectively. The membrane ensured total removal of suspended solids and produced treated water of excellent bacteriological quality. The sludge production stabilized at 0.20 gDS/kg COD removed. The membrane flux was stable for all conditions tested.

Pilot-plant study of a high recovery membrane filtration process for drinking water treatment

2000 ◽  
Vol 41 (10-11) ◽  
pp. 77-84 ◽  
Author(s):  
J.Y. Huang ◽  
S. Takizawa ◽  
K. Fujita
Keyword(s):  
Membrane Fouling ◽  
Membrane Filtration ◽  
Cross Flow ◽  
Drinking Water Treatment ◽  
Pilot Scale ◽  
Raw Water ◽  
Circulation Flow ◽  
High Recovery ◽  
Chemical Cleaning ◽  
Cross Flow Filtration

Successful application of energy efficient dead-end micro-filtration (MF), which does not require recirculation like cross-flow filtration, depends on achieving high recovery rates. In this study, two different types of pilot scale membrane systems (horizontally and vertically stretched membrane filters) were evaluated based on the effects of pre-chlorination, intermittent chlorination and circulation flow by air-scrubbing. Additionally, the effects of operating factors including physical cleaning and chemical cleaning on membrane fouling were examined. The vertically stretched membranes showed better performance than horizontally stretched membranes at filtration fluxes of either 0.55 m/day or 0.78 m/day even under 2.6 to 27.5°C and raw water turbidity higher than 300 units, as long as intermittent chlorination (10 mg/l once a week) along with the circulation flow by air-scrubbing (once in 30 minutes) in the housing were employed. It was demonstrated that the vertically stretched membranes have been operated for one year without chemical cleaning of the membranes, wherein the recovery of raw water as a filtrate was 97.0% or 98.9%.

Research on Treatment Process for Chemical Agent VX Polluted Water by Enhanced Coagulation

2013 ◽  
Vol 361-363 ◽  
pp. 785-788
Author(s):  
Xiao Jie Wang ◽  
Xiao Jing Li ◽  
Shuang Wang ◽  
Yun Zhe Ji
Keyword(s):  
Ammonium Chloride ◽  
Ferric Chloride ◽  
Treatment Process ◽  
Removal Rate ◽  
Polluted Water ◽  
Chemical Agent ◽  
Raw Water ◽  
Water Turbidity ◽  
Enhanced Coagulation ◽  
Better Than

The influences of coagulant species, dose, water turbidity, and pollution situation of raw water on the results of enhanced coagulation have been investigated targeted at water contaminated by chemical agent. Ferric trichloride and polymeric aluminum ferric chloride (PAFC) acted as coagulant, poly dimethyl diallyl ammonium chloride (HCA) worked as coagulant aid and paraoxon acted as simulation agent of chemical agent VX in this process. The results show that: enhanced coagulation process cannot remove effectively chemical agent (paraoxon) in raw water; the result of treatment by PAFC and PAFC+HCA is better than that by FeCl3 and FeCl3+HCA; the addition of certain amount of HCA based on the condition that coagulant has been added will improve removal rate of both chemical agent and turbidity; the bigger the turbidity of raw water is, the higher the removal rate of paraoxon will be.

The effect of preozonation on microorganism and particle removal

2000 ◽  
Vol 41 (7) ◽  
pp. 9-16 ◽  
Author(s):  
J. Y. Gaubert ◽  
C. Piet ◽  
D. Gatel ◽  
P. Bonne ◽  
J. Hutchison ◽  
...  
Keyword(s):  
Treatment Plant ◽  
Water Treatment Plant ◽  
Pilot Scale ◽  
Virus Inactivation ◽  
Particle Removal ◽  
Raw Water ◽  
European Regulation ◽  
Study Results ◽  
Microorganism Removal ◽  
By Products

The new European regulation on treated water focuses on oxidation by-products and consequently the use of ozone for parasites and virus inactivation should be limited. To achieve the necessary removal of parasites by a multi-barrier water treatment plant, physical removal needs to achieve consistently high levels of particle and microorganism removal. TheNeuilly-sur-Marne treatment plant treats raw water of particularly poor bacteriological quality. In order to improve the filtered water quality, preozonationhas been tested in a pilot scale study. Results obtained have confirmed that, with this sort of raw water, preozonation directly on the raw water or on the settled water can provide a significant improvement in filtered water. This is true for both particles and coliforms. It appears that an ozone dose of 0.5 g/m3 is enough to achieve a constant level of efficiency.

Fouling of low-pressure membranes during drinking water treatment: effect of NOM components and biofiltration pretreatment

2013 ◽  
Vol 14 (3) ◽  
pp. 453-460 ◽  
Author(s):  
I. Rahman ◽  
S. Ndiongue ◽  
X. Jin ◽  
M. I. Van Dyke ◽  
W. B. Anderson ◽  
...  
Keyword(s):  
Drinking Water ◽  
Water Treatment ◽  
Membrane Fouling ◽  
Drinking Water Treatment ◽  
Low Pressure ◽  
Pilot Scale ◽  
Substantial Improvement ◽  
Raw Water ◽  
Minimal Impact ◽  
Detection Analysis

Fouling is a major challenge for low-pressure membrane drinking water treatment systems. Previous research has demonstrated that under the right conditions, biofiltration is an effective method to reduce fouling of low-pressure polymeric membranes. This study provides additional insight into the effect of biofiltration as a pretreatment for fouling reduction by using river water with different raw water quality characteristics than has been examined in previous studies. Two parallel pilot-scale dual media (sand/anthracite) biological filters were operated continuously over a period of 14 months. Liquid chromatography–organic carbon detection analysis confirmed that the parallel biofilters performed similarly with both averaging on 21% biopolymer removal. Raw and treated water biopolymer concentrations were correlated, with increased absolute removals occurring at higher raw water concentrations. Ultrafiltration (UF) membrane fouling experiments showed substantial improvement in performance following biofiltration pretreatment by reducing hydraulically irreversible and reversible fouling rates by 14–68% and 8–55%, respectively. The results also reaffirm the importance of biopolymers at concentrations as low as ∼0.1 mg/L on irreversible and reversible UF membrane fouling and a minimal impact of humic substances.

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