Evaluation of dynamic membrane formation and filtration models at constant pressure in a combined coagulation/dynamic membrane process in treating polluted river water

2013 ◽  
Vol 13 (2) ◽  
pp. 286-293 ◽  
Author(s):  
Chunhua Xu ◽  
Baoyu Gao ◽  
Baichuan Cao ◽  
Dandan Cheng ◽  
Qinyan Yue
Keyword(s):  
River Water ◽  
Membrane Fouling ◽  
Constant Pressure ◽  
Dominant Role ◽  
Formation Time ◽  
Woven Fabric ◽  
Dynamic Membrane ◽  
Membrane Formation ◽  
Fabric Filter ◽  
Dacron Mesh

In this study, a dynamic membrane (DM) was formed by flocs produced by river water pollutants reacting with polyaluminum chloride (PAC). The DM was used to separate the flocs from the mixed liquor at constant pressure. Two support media for the DM were tested: non-woven fabric filter and dacron mesh. The formation time of the DM was determined according to the critical flux. The formation process and filtration mechanisms were evaluated based on typical crossflow membrane fouling models and combinations of them. When a non-woven fabric filter was used as the support media, the formation time of the DM was 70 min at 4 cm water head drop (WHD) and 20 min at 8 cm WHD. When dacron mesh was used as the support media, the membrane formation required 100 min at 4 cm WHD and 70 min at 8 cm WHD. During DM formation on a non-woven fabric filter, the internal pore blocking plays the dominant role. But when dacron mesh is used as the support media, complete blocking and intermediate blocking dominate. After the formation of a DM, the combined models have good agreement with the experimental data compared with the typical filtration models.

scholarly journals Development and evaluation of a prototype non-woven fabric filter for purification of malaria-infected blood

2011 ◽  
Vol 10 (1) ◽  
pp. 251 ◽  
Author(s):  
Zhi-Yong Tao ◽  
Hui Xia ◽  
Jun Cao ◽  
Qi Gao
Keyword(s):  
Woven Fabric ◽  
Infected Blood ◽  
Fabric Filter

Experimental Study on Non-Backwashing Dynamic Membrane Bio-Reactor

2014 ◽  
Vol 522-524 ◽  
pp. 682-685
Author(s):  
Xian Si Xie ◽  
Ping Shang
Keyword(s):  
Experimental Study ◽  
Membrane Fouling ◽  
Polyester Fabric ◽  
Stable Operation ◽  
High Flux ◽  
Dynamic Membrane ◽  
Flux Decline ◽  
Before And After ◽  
Important Sign

Using a DMBR, which consists of two piece of Polyester fabric mini nets and an interactive unit with brushes, to test whether it can relieve membrane fouling and keep the reactors stable operation on a high flux by anti-brushing periodically or not. The results indicated that when the flux was 45L/m2·h, it could operate 28d until the flux decline. And it also showed that an operation by running the interactive unit periodically could remove the dynamic membrane and make the non-backwashing come true. By comparing the amount of bio-film on the nets surface before and after anti-brushing, it proved that anti-brushing had a good cleaning effect to net. In addition to through a detection to the effluent turbidity, it could put 0.5NTU as an important sign to do anti-brushing operation.

Assessing irreversible fouling behavior of membrane foulants in the ultrafiltration of natural water using principal component analysis of fluorescence excitation-emission matrices

2011 ◽  
Vol 11 (2) ◽  
pp. 179-185 ◽  
Author(s):  
R. H. Peiris ◽  
H. Budman ◽  
R. L. Legge ◽  
C. Moresoli
Keyword(s):  
Principal Component Analysis ◽  
Particulate Matter ◽  
River Water ◽  
Membrane Fouling ◽  
Principal Component ◽  
Drinking Water Treatment ◽  
Component Analysis ◽  
Monitoring And Control ◽  
Fluorescence Excitation ◽  
Natural River Water

Natural river water is comprised of different foulant components such as natural organic matter and colloidal/particulate matter. Both individual and combined contributions of these foulant components results in different fouling behaviour. The ability to characterize these contributions that lead to reversible and irreversible membrane fouling would be beneficial for the implementation of fouling monitoring and control strategies for membrane-based drinking water treatment operations. A fluorescence excitation-emission matrix and principal component analysis-based approach was able to qualitatively estimate the accumulation of humic substances (HS)-, protein- and colloidal/particulate matter-like foulant components in membranes during the ultrafiltration (UF) of natural river water. A bench-scale flat sheet UF cross-flow set-up and successive permeation and membrane backwashing cycles were used. Analysis of the accumulation of these foulant components revealed that the increased levels of colloidal/particulate matter accumulation in the membranes appeared to have increased the extent of irreversible fouling by HS-like matter whereas lower irreversible fouling by protein-like matter was observed with increased colloidal/particulate matter accumulation. The results also indicate that the combined contributions by these foulants are important in the fouling of membranes during the UF of river water.

Filtration characteristics of immersed coarse pore filters in an activated sludge system for domestic wastewater reclamation

2007 ◽  
Vol 55 (1-2) ◽  
pp. 51-58 ◽  
Author(s):  
G.T. Seo ◽  
B.H. Moon ◽  
Y.M. Park ◽  
S.H. Kim
Keyword(s):  
Activated Sludge ◽  
Domestic Wastewater ◽  
Woven Fabric ◽  
Wastewater Reclamation ◽  
Fabric Filter ◽  
Tubular Type ◽  
N Removal ◽  
Activated Sludge Reactor ◽  
Filtration Area ◽  
Plate Type

The filtration characteristics of two different module configurations with coarse pore filter (non-woven fabric) were investigated for sludge floc separation in an activated sludge reactor for domestic wastewater reclamation. A polypropylene non-woven fabric filter (35 g/m2) was used for the two different module configurations, one flat and one tubular type, each with a filtration area of 0.052 m2. The different module types, submerged in the oxic compartment of A/O (anaerobic/oxic) type reactors, were operated simultaneously. The filtration fluxes were gradually increased from 0.5 to 1.2 and 1.73 m/d. The filtration pressures were more stably maintained for the tubular type module than the plate type. The tubular type module installed horizontally with two-side suction showed less filtration pressures than the tubular type module installed vertically with one-side suction. The solid separation was significantly high showing less than 5 mg/L effluent solids. The organic and T-N removal efficiencies were around 95 and 50%, respectively. The 85% removal of T-P was achieved with 20 mg/L injection of PAC (poly-aluminum chloride).

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