scholarly journals Adsorptive removal of geosmin by ceramic membrane filtration with super-powdered activated carbon

2007 ◽  
Vol 56 (6-7) ◽  
pp. 411-418 ◽  
Author(s):  
Yoshihiko Matsui ◽  
Takako Aizawa ◽  
Fumiaki Kanda ◽  
Naoko Nigorikawa ◽  
Satoru Mima ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Membrane Filtration ◽  
Ceramic Membrane ◽  
Powdered Activated Carbon ◽  
Adsorptive Removal

Removal of geosmin and algae by ceramic membrane filtration with super-powdered activated carbon adsorption pretreatment

2007 ◽  
Vol 7 (5-6) ◽  
pp. 43-51 ◽  
Author(s):  
Y. Matsui ◽  
T. Aizawa ◽  
M. Suzuki ◽  
Y. Kawase
Keyword(s):  
Activated Carbon ◽  
Membrane Filtration ◽  
Ceramic Membrane ◽  
Tap Water ◽  
Powdered Activated Carbon ◽  
Transmembrane Pressure ◽  
Activated Carbon Adsorption ◽  
Consumer Complaints ◽  
Carbon Adsorption ◽  
Water Treatment Plants

The musty-earthy taste and odour caused by the presence of geosmin and other compounds in tap water are major causes of consumer complaints. Although ozonation and granular activated carbon (GAC) adsorption have been practiced in water-treatment plants to remove these compounds effectively, two major problems associated with the application of these processes – formation of stringently regulated bromate ions by ozonation and unhygienic invertebrate colonisation of GAC filters – are still to be resolved. This research advanced the process of adsorption by powdered activated carbon (PAC) by reducing its particle size to the submicrometre range for microfiltration pretreatment. Adsorption pretreatment by using this super (S)-PAC removed the geosmin with vastly greater efficiency than by normal PAC. Removal was attained in a much shorter contact time and at a much lower dosage. The S-PAC was also beneficial in attenuating the transmembrane pressure rises that occurred between both physical backwashings and chemical cleanings.

Development of advanced ceramic membrane filtration system combined with ozonation and powdered activated carbon treatment

2001 ◽  
Vol 1 (5-6) ◽  
pp. 91-96 ◽  
Author(s):  
M. Shioyama ◽  
T. Kawanishi ◽  
S. Yokoyama ◽  
M. Nuno ◽  
T. Yamamoto
Keyword(s):  
Activated Carbon ◽  
Water Treatment ◽  
Membrane Filtration ◽  
Ceramic Membrane ◽  
Removal Rate ◽  
Ammonia Nitrogen ◽  
Powdered Activated Carbon ◽  
Medium Size ◽  
Biological Degradation ◽  
By Products

Combining the Kubota Tank-Submerged type Ceramic Membrane filtration (TSCM) system with ozonation and powdered activated carbon (PAC) treatment, a new water treatment system, the advanced TSCM system, has been developed. It is a compact, maintenance-free and high performance system for water treatment plants in the small and medium size cities. In this paper, experimental results using 5.5m3/day demonstration plants are shown, and treatment performance is discussed mainly focussing on removal of disinfection by-products. Turbidity, color, total iron, total manganese and ammonia nitrogen were removed to below their detection limits. Accumulation of suspended solids including PAC at a maximum concentration of 8000 mg/L in the membrane tank increases biological degradation activity in the TSCM system. Furthermore, it was confirmed that the advanced TSCM system was able to effectively eliminate disinfection by-products and other organic contaminants in raw water. 75% of T-THMFP removal rate was obtained at only 10 mg-PAC/L dosage without the effect of ozone dosage, while the PAC treatment at 50 mg-PAC/L dosage prior to coagulation results in T-THMFP removals ranging from 40 to 60% (The Adoption Guideline of Advanced Water Treatment Facility, 1988). Therefore, it is concluded that the advanced TSCM system saves on the amount of PAC and is more cost-effective than the other conventional water treatment systems due to efficient utilization of the adsorption capacity of PAC.

Capillary nanofiltration coupled with powdered activated carbon adsorption for high quality water reuse

2009 ◽  
Vol 60 (1) ◽  
pp. 251-259 ◽  
Author(s):  
C. Kazner ◽  
J. Meier ◽  
T. Wintgens ◽  
T. Melin
Keyword(s):  
Activated Carbon ◽  
Water Reuse ◽  
Membrane Filtration ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Powdered Activated Carbon ◽  
Transmembrane Pressure ◽  
Municipal Wastewater Treatment ◽  
High Quality ◽  
Quality Water

Direct capillary nanofiltration was tested for reclamation of tertiary effluent from a municipal wastewater treatment plant. This process can be regarded as a promising treatment alternative for high quality water reuse applications when combined with powdered activated carbon for enhanced removal of organic compounds. The nanofiltration was operated at flux levels between 20 and 25 L/(m2 h) at a transmembrane pressure difference of 2–3 bar for approximately 4,000 operating hours. The study was conducted with PAC doses in the range from 0 to 50 mg/L. The plant removal for DOC ranged from 88–98%. The sulfate retention of the membrane filtration process was between 87 and 96%. The process provided a consistently high permeate quality with respect to organic and inorganic key parameters.

scholarly journals Effects of Ferrihydrite-Impregnated Powdered Activated Carbon on Phosphate Removal and Biofouling of Ultrafiltration Membrane

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1178
Author(s):  
Jenyuk Lohwacharin ◽  
Thitiwut Maliwan ◽  
Hideki Osawa ◽  
Satoshi Takizawa
Keyword(s):  
Activated Carbon ◽  
Membrane Fouling ◽  
Membrane Filtration ◽  
Membrane Surface ◽  
Powdered Activated Carbon ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Surface Water Treatment ◽  
Filtration System ◽  
Pore Blockage

The presence of multiple contaminant species in surface waters makes surface water treatment difficult to accomplish through a single process. Herein, we evaluated the ability of an integrated adsorption/ultrafiltration (UF) membrane filtration system to simultaneously remove phosphates and dissolved organic matter (DOM). When bare powdered activated carbon (PAC) and PAC impregnated with amorphous ferrihydrite (FHPAC) adsorbents were compared, FHPAC showed a greater adsorption rate and capacity for phosphate. FHPAC had a phosphate adsorption capacity of 2.32 mg PO43−/g FHPAC, even when DOM was present as a competing adsorbate. In a lab-scale hybrid FHPAC-UF system (i.e. integrated adsorption by FHPAC with UF membrane filtration), irreversible membrane fouling was ca. three times lower than that in a PAC-UF system. When membrane fouling in the PAC-UF system was described with pore blockage models, we found that the main cause of fouling was bacterial deposition on the membrane surface. CLSM analysis determined that the chemical composition of foulants in the PAC-UF system included higher proportions of proteins, nucleic acids, and alpha-polysaccharides than that in the FHPAC-UF system. Overall, FHPAC’s ability to undergo ligand exchanges with DOM helped to reduce the nutrients and bacteria that cause biofouling to accumulate on the membrane surface.

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