Regeneration of an aqueous cleaner using ultrafiltration: A case study

Woodrow, T.A.; Barnes, Edward S.

doi:10.1016/0026-0576(96)83959-6

Cited by 4 publications

(3 citation statements)

References 2 publications

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Section: Introductionmentioning

confidence: 99%

“…Over time, the cleaning solutions can become contaminated with oil and grease (O&G) and suspended solids, and must be recycled or disposed of as hazardous wastes. Various recycling technologies exist, but few p roduce usable recycled products [7,[9][10][11].We recently reported [12] that a 0.05 µm ZrO2 u l t r afilter (7 mm i.d. x 750 mm-long tubular filter manufac-t u red by U.S. Filter) effectively removed O&G, including one synthetic ester oil, two polyalphaolefin (PAO)based oils and greases, and two petroleum hydro c a rbon-based oils and greases, from two alkaline cleaning solutions (i.e., Tu rc o ® 4 2 1 5 -N C LT and Daraclean ® 282) containing nonionic surfactants.…”

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confidence: 99%

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Recycling a nonionic aqueous‐based metal‐cleaning solution with a ceramic membrane: Pilot‐scale evaluation

2001

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I N T R O D U C T I O NAqueous alkaline cleaning solutions have been commonly used for metal cleaning since the phase-out of o rganic solvent vapor degreasers [1][2][3][4][5][6][7][8]. The cleaning solutions usually are composed of alkaline builders, surfactants, co-solvents, and additives that pro m o t e / enhance detergency and longevity of the solutions. Over time, the cleaning solutions can become contaminated with oil and grease (O&G) and suspended solids, and must be recycled or disposed of as hazardous wastes. Various recycling technologies exist, but few p roduce usable recycled products [7,[9][10][11].We recently reported [12] that a 0.05 µm ZrO2 u l t r afilter (7 mm i.d. x 750 mm-long tubular filter manufact u red by U.S. Filter) effectively removed O&G, including one synthetic ester oil, two polyalphaolefin (PAO)-based oils and greases, and two petroleum hydro c a rbon-based oils and greases, from two alkaline cleaning solutions (i.e., Tu rc o ® 4 2 1 5 -N C LT and Daraclean ® 282) containing nonionic surfactants. The O&G concentrations were reduced from >10,000 mg/L to near or below analytical limits of quantification. The ZrO2 membrane was effectively cleaned after repeated use during more than 13 test runs for a total run time of over 50 hours, as indicated by restoration of its clean water permeability (CWP) (i.e., permeability to 0.2 µm m e m b r a n e -p re f i l t e red deionized water) to gre a t e r than 75% of the initial value. Furtherm o re, the membrane allowed nearly complete passage of all alkaline salts; a co-solvent, diethylene glycol monobutyl ether (DGME); a corrosion inhibitor, 2-merc a p t o b e n z o t h i azole (MBT); and an unknown organic constituent. Note: Mention of trade names or commercial pro ducts does not constitute endorsement or re c o m m e n d ation for use.The membrane, however, also removed almost all nonionic surfactants (i.e., alkylpolyoxyalkylene glycol ether [AGE] and nonylphenolpolyethylene glycol ether [NPE]) [12]. Removal of these surfactants re q u i re s proper replenishment to the recycled solutions, which adds complexity and cost to the full-scale operation of this recycling process. Also, information pertinent to the system integration (e.g., batch vs. on-line) and p e rf o rmance of re c y c l e d / replenished baths for metal

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Recycling a nonionic aqueous‐based metal‐cleaning solution with a ceramic membrane: Pilot‐scale evaluation

2001

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“…Since stable operation of the membranes in MBRs is desired, physical/chemical incompatibility of the membrane materials with the feed characteristics should be improved through pretreatment which may optimize the operation of the membranes in terms of fouling control (Woodrow and Barnes, 1996;Lindsey et al, 1994;Weltman and Evanoff, 1992). Pellegrino and Sikdar (1997) reported that prefiltering may be required in hollow fiber membranes, with an inside-out filtration mode, to improve the feed characteristics in terms of both viscosity and solids content when feed has high solids concentrations over 20 g MLSS/L.…”

Section: Feed Pretreatmentmentioning

confidence: 99%

Tubular ceramic membrane bioreactor: operating characteristics and treatment performance

Ersü¹

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Membrane biological reactors (MBR) are becoming popular as a treatment option and are seen as the next generation of wastewater treatment plants. The objectives of this study were to investigate the physical operating characteristics of a tubular ceramic membrane .and to assess its performance for the treatment of synthetic wastewater and * l mL of stock solution in 999 mL of synthetic wastewater. Stock solution consists of 384 mL liquid Isomil in 3.78 L (1 gallon) of tap water.

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Cleaning and degreasing

Murphy¹

1997

Metal Finishing

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Regeneration of an aqueous cleaner using ultrafiltration: A case study

Cited by 4 publications

References 2 publications

Recycling a nonionic aqueous‐based metal‐cleaning solution with a ceramic membrane: Pilot‐scale evaluation

Recycling a nonionic aqueous‐based metal‐cleaning solution with a ceramic membrane: Pilot‐scale evaluation

Tubular ceramic membrane bioreactor: operating characteristics and treatment performance

Cleaning and degreasing

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