Organic recovery

C45 General Oxidation (including Disinfection) - R12 Solvents/Organics Recovery - Thin-Film... 

C99 Other Chemical Treatment R14 Solvents/Organics Recovery - Solvent Extraction R19 Solvents/Organics Recovery - Other... 

R11 Solvents/Organics Recovery - Batch Still Distillation ... 

RORGS Recovery of organics Recovery of organics uses direct physical removal methods (e.g., distillation and steam stripping) to extract organic constituents from a waste... 

Ion exchange polar, nonpolar large volumes, organic recovery 70-90% resin preparation and elution 18, 24, 25... 

Two different RO membrane types were evaluated in this study. The first was a standard cellulose acetate based asymmetric membrane. The second type, a proprietary cross-linked polyamine thin-film composite membrane supported on polysulfone backing, was selected to represent potentially improved (especially for organic rejection) membranes. Manufacturer specifications for these membranes are provided in Table III. Important considerations in the selection of both membranes were commercial availability, high rejection (sodium chloride), and purported tolerance for levels of chlorine typically found in drinking water supplies. Other membrane types having excellent potential for organic recovery were not evaluated either because they were not commercially... 

Figure 4. Major components of an RO concentration-Donnan dialysis organic recovery system.

The importance of proper RO membrane selection has already been discussed. A review of commercially available RO membranes revealed five different basic membranes that could provide organic recovery. Cellulose acetate and cellulose acetate blends, aromatic polyamide, polyamide thin-film composite, cross-linked polyimine thin-film composite (FT-30), and polybenzimidazole were available when this work was performed. Only the first four types were commercially available. All membranes were available with excellent salt rejection (>97 sodium chloride). Two types of membranes, cellulose acetate and FT-30, have shown short-term (<2-months intermittent use) resistance... 

Cellulose acetate membrane was studied because of its past use in concentrate preparation and the need to better define its performance for specific organic recovery. Cellulose acetate continues to be widely used for a variety of industrial and commercial water purification applications. Cellulose acetate was not expected to perform at the level of the more highly cross-linked and inert thin-film composite membrane. 

PHASE DEHYDRATION PP TRI HEAVIES ORGANIC RECOVERY PQ NEUTRALIZER... 

Another favorable aspect of stirred batch reactors is the fact that they are compatible with most forms of a biocatalyst. The biocatalyst may be soluble, immobilized, or a whole-cell preparation in the latter case a bioconversion might be performed in the same vessel used to culture the organism. Recovery of the biocatalyst is sometimes possible, typically when the enzyme is immobilized or confined within a semi-permeable membrane. The latter configuration is often referred to as a membrane reactor. An example is the hollow fiber reactor where enzymes or whole cells are partitioned within permeable fibers that allow the passage of substrates and products but retain the catalyst. A hollow-fiber reactor can be operated in conjunction with the stirred tank and operated in batch or... 

Vapor Permeation Vapor permeation is similar to vapor pervaporation except that the feed stream for permeation is a gas. The future commercial viability of this process is based upon energy and capital costs savings derived from the feed already being in the vapor-phase, as in fractional distillation, so no additional heat input would be required. Its foreseen application areas would be the organics recovery from solvent-laden vapors and pollution treatment. One commercial unit was installed in Germany in 1989 (Ref. 26). 

Step 9. We have now established the basic regulatory plantwide control strategy (Fig. 11.3). Based upon the heuristic established by Fisher et al. (1988) that recycle gas flow s should be maximized to improve reactor yield, we open or remove the separator, vaporizer, and absorber overhead valves and run the compressor full out. To minimize the decanter temperature for improved organic recovery, the column condenser cooling water is set at maximum flow. Optimization of several controller... 

Is the material biodegradable and potentially beneficial when discharged to environmental media or to an organic recovery system such as anaerobic digestion or composting ... 

Does a recycling or organic recovery infrastructure exist for the material ... 

Organic recovery eflBciency from aqueous solution by freeze concentration has been reported (4) to decrease as the specific conductance or total dissolved solids increased. A similar effect has been observed for the recovery of heavy metals from a variety of aqueous solutions. Figure 7 illustrates the recovery-suppressing effect of dissolved sohds on copper as measured by specific conductance in the range of 40 to 40,000 /Ltmhos/cm. The matrices include deionized-distilled water, 10 to 10" M phosphate buffers and tap waters originally at pH 4 0.5, and 0.12N (approximate) HCl solution at pH 1.4. The recovery of other heavy metal cations follows in a similar manner. 

Dissolved inorganic solids have been shown to inhibit organic recovery eflBciency by freeze concentration from aqueous solution (4). Similarly, increased salt content reduces cationic recovery (Figure 7). As ionic concentration increases at the interface, there is an increase in tendency toward dendritic growth and associated entrapment, changes in surface tension and induced interfacial potential, and impedance of specific ionic migration. 

Greene, W. A. 2002. Organic recovery with CoMatrix filtration. In Proceedings international solvent extraction conference, vol. 2, eds. K. C. Sole, P. M. Cole, J. S. Preston, and D. J. Robinson, 1428-1433. Johannesburg South African Institute of Mining and Metallurgy. 

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