Removal of Dissolved VOCs from Water with an Air Stripper/Membrane Vapor Separation System

Abstract

Treatment of water contaminated with volatile organic compounds (VOCs) is a major problem for the United States chemical industry. Currently, VOCs are removed from moderately contaminated wastewater streams by processes such as steam stripping and from dilute wastewaters by air stripping combined with a carbon adsorption off-gas treatment system. This paper describes the development and performance of a hybrid process that combines air stripping with membrane organic-vapor separation to recover VOCs from the stripper off-gas. A number of prototype systems have been constructed and evaluated. The optimum system appears to be a tray stripper fitted with a high-pressure compression-condensation membrane separation unit. Such a system can remove 95 to 99% of the VOCs present in contaminated water; the removed VOCs are recovered as a liquid condensate. The economics of the technology are competitive with alternative processes, particularly for streams containing more than 500 ppm VOC and having flow rates less than 10 to 30 g a h i n .

Analysis of microbial components of two-liquid phase bioreactors for improved volatile organic compund biofiltration

“…Physico-chemical methods for removal of waste gas containing VOCs include condensation (Buonicore, 1992), adsorption (Hines et al, 1993), absorption (Hines et al, 1993), incineration (de Nevers, 1995), membrane filtration systems (Wijmans et al, 1997) and ultraviolet treatment (Gschwandtner & Fairchild, 1992). These methods are less efficient and effective in dealing with large volumes of air containing low concentration of VOCs (Crocker & Schnelle, 1998;Shareefdeen & Singh, 2005).…”

Extraction of Organic Volatile Pollutants in Over-Saturated Water by Pervaporation Technique Using a Poly (Dimethylsiloxane)-Based Sealer as a Membrane

“…The risk of VOCs arises from their toxicity to humans and the environment [2]. The decontamination of water from organic effluent has attracted considerable attention using various methods [2][3][4], such as the traditional treatment of water polluted with VOCs, including air stripping, carbon adsorption, biological treatment [5], and membrane separation techniques. Membrane separation processes generally consume less energy than other separation techniques and can be combined easily with other techniques.…”

Molecular Grafting of Fluorinated and Nonfluorinated Alkylsiloxanes on Various Ceramic Membrane Surfaces for the Removal of Volatile Organic Compounds Applying Vacuum Membrane Distillation

“…An interesting solution to overcome these limitations is the utilization of membrane processes, , especially vacuum separation techniques (e.g., vacuum membrane distillation, VMD, and vacuum pervaporation,VPV). ,, VMD process is predominantly utilized for desalination, removal of organics from water, and for solvent concentration . VPV process is applied for separation of binary or multicomponent liquid mixtures .…”