2013 Buyers' Guide 2013 Buyers' Guide - Filtration News

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Testing | GAED Figure 3. Adsorption Isotherm for MTBE in Water Figure 4. Adsorption Isotherm for Phenol in Water Table 1. Carbon Characteristic Curves - Cumulative Basis allow user to plug in desired minimum adsorption energy needed to capture a target molecule, and calculate its corresponding available pore volume for that sample run material. Using the Polanyi heterogeneous adsorption model concepts allows the Characteristic Curves to be transformed into isotherms, see Figure 4. These three example isotherms cover a weakly, moderately and very well adsorbed molecule from water, i.e., Methyl-tertiarybutylether or MTBE, Benzene and Phenol, respectively. An important feature of this transformation from Characteristic Curve to isotherm is that users can get isotherms at any temperature they want. Determining classical empirical ASTM isotherms have limitations for the temperature and also cost many orders more than quickly GAED derived isotherms. 32 • August 2012 • www.filtnews.com UNUSED AND USED GAC CASE STUDY Figure 1 contains the AVolume based Carbon Characteristic Curves-Cumulative. Note that PACS sample identifications are: AA-686 is unused GAC, AA-687 is its used version, AA-688 is a different unused starting GAC, and AA-689 is its corresponding used counter-part material. These curves provide on the Y-axis adsorption space volumes, classically called pore volumes as a function of Adsorption Energies on the X-axis in cal/cc. Providing characteristic curves in volume presentation eliminates the problem with the wide range of adsorbates and AC densities. When presented on an optional mass
ases, presentations are grams adsorbed per 100 g carbon on the Y-axis. In a drinking water plant and many other applications volume presentations are better than mass because the end user has a finite adsorber volume to fill with GAC or other forms of this media. The last of five samples presented in Figure 1, and shown on Table I, is a benchmark coal based liquid phase standard GAC. The standard functions as a quality control and assurance check to validate the GAED instrument is completely operational. The GAED instrument was within its statistical control limits during sample analysis. This instrument has been used continuously the last 15 years with no malfunctions. This has created a large database of GAED runs on a wide variety of sorbents. It literally runs itself. Interpretation of the raw data and report writing consumes most of the lab time for GAED analysis. Figure 1 graphical presentations are summarized in Table 1 as numerical tabular values. Table 4 uses these data Table 2. ASTM Apparent Densities, Iodine, Ash and Hardness Values values from Table 1 to let us know what adsorption spaces were filled with adsorbates in these two starting unused AC drinking water adsorbers. Both used GAC filters are near their time to be replaced with fresh unused AC. AC does not last forever. AC is also expensive and should not be replaced prematurely. When the water going in and out of the GAC adsorber is the same, GAC is exhausted, and no longer removing adsorbates. In a drinking water plants used AC is still removing particulate matter and reducing product water turbidity during the automated backwashing cycles. Users can do suspended solids test on backwash samples to prove this benefit. mg/g ASTM UNUSED AND USED TESTS American Society for Testing Materials Committee D or ASTM provides industry consensus standardized test methods used in the purchasing process. These standardized test methods are hallmarks of the activated carbon industry and need to be run regularly to control AC manufacturing and field processes and provide specification data for purchasing. GAED also needs to be added as a spec before purchase. As can be seen in Table 2 that the dry apparent densities (AD) of the used GAC samples are higher than its unused starting specimen. These AD observations have two sources: the unused adsorption spaces are filled www.filtnews.com • August 2012 • 33
Page 1: I N T E R N A T I O N A L FILTRATIO
Page 6: Editorial Advisory Board Editorial
Page 10 and 11: Association | News Engineering Meri
Page 12: Industry | Events Whitehouse Scient
Page 16 and 17: Cover Story | A2Z Filtration The Im
Page 18 and 19: Absorbents | Adsorbents Absorbing F
Page 20 and 21: Absorbents | Adsorbents water remov
Page 22 and 23: Absorbents | Adsorbents Removing Wa
Page 24 and 25: Absorbents | Adsorbents table salt)
Page 26 and 27: Testing | Filter Performance Determ
Page 28 and 29: Testing | Filter Performance (vendo
Page 30: Testing | Filter Performance by IBR
Page 33: to provide full physical adsorption
Page 37 and 38: Table 5. Polynomial Equations from
Page 39 and 40: I N T E R N A T I O N A L FILTRATIO
Page 41 and 42: Filter Winding Machinery. .........
Page 43 and 44: Air Filtration Equipment: Cabin Fil
Page 45 and 46: Center Cores: Rosedale Products, In
Page 47 and 48: Dust Collectors: IBIS International
Page 49 and 50: Filter Caps: Rosedale Products, Inc
Page 51 and 52: Matrix Separations LLC PO Box 16369
Page 53 and 54: Filter Manufacturer: Air Filters In
Page 55 and 56: Filter Products: Dexmet Corporation
Page 57 and 58: Filters Automatic: Filters & Strain
Page 59 and 60: Glue Machines: Laminating Machinery
Page 61 and 62: Manufacture Flanges: Membrane-Filtr
Page 63 and 64: fiber & polyester filter media with
Page 65 and 66: Plastic Netting and Tubing: convert
Page 67 and 68: Pleaters Rotary Type: Seals: A2Z Fi
Page 69 and 70: Sonobond Ultrasonics 1191 McDermott
Page 71 and 72: Phoenix Wire Cloth, Inc. 585 Stephe
Page 73 and 74: www.filtnews.com • August 2012

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