Characterization and selection of waste oils for the absorption and biodegradation of VOC of different hydrophobicities

Abstract

Waste oils have been studied as a solvent for absorption and biodegradation of 7 VOC  Volatility, viscosity, partition coefficient and toxicity towards VOC were investigated  Choice of a solvent depends also on its availability and cost  Engine oil is not appropriate to absorption of VOC because of its high volatility  Hydraulic oil is the most suitable waste oil for absorption and biodegradation of VOC

Preparation of Nano-Porous Carbon-Silica Composites and Its Adsorption Capacity to Volatile Organic Compounds

“…(1) Preparation method of the hydrophobic aerogel 1 Preparing a diluent of TEOS (the molar ratio of TEOS, ethyl alcohol, and deionized water was TEOS:ETOH:H 2 O = 1:4:4); adjusting the pH value by using 0.1 mol/L hydrochloric acid to 1-2; and then the hydrogel was prepared. 2 Placing and stirring the hydrogel in a water bath with the temperature of 60 • C for 2 h, adjusting the pH value by ammonia water (25 wt%) to 3-7 for gelling, and then putting it into the aging solution (TEOS:ETOH:NH 4 OH = 1:1:1 in volume ratio) for 24 h. 3 Placing the gel into the n-hexane solution with the temperature of 60 • C for 24 h. 4 Then, placing the gel into the hydrophobic modification liquid (TMCS:n-hexane = 1:4 in volume ratio) with the temperature of 60 • C for 12 h. 5 Washing the gel 3 times with the n-hexane solution, drying it at 150 • C for 2 h, and then the hydrophobic aerogel can be obtained. (2) Preparation of carbon-silica composites materials Activated carbon powder (the dosage was 2% or 4% to the mass of the hydrogel) with the diameter of about 75 µm was added into the hydrogel (between step 1 and step 2 in the process of hydrophobic aerogel preparation), keeping the other steps unchanged, and the carbon-silica composites adsorbent can be obtained.…”

“…① Putting the pretreated adsorbent sample (its mass recorded as m1) into the weighting bottle and placing it (its mass recorded as m2) in the vacuum retainer (2). ② Closing the valve (12) after vacuuming the retainer (2). ③ Opening the valve (13), and the gasoline will be sucked into the retainer (2).…”

“…On the global scale, VOCs emissions are mainly from natural sources. However, for the key regions and cities, emissions from man-made sources are much higher than those from natural sources, such as petrochemicals, oil and gas storage and transportation, pharmaceuticals, coatings, rubber, printing, and other processes [2]. A large amount of VOCs are generated in the above processes.…”

Innovative applications of Waste Cooking Oil as Raw Material

“…Lhuissier and coworkers developed a non-aqueos phase (NAP) bioreactor for the capture and the biodegradation of VOCs. 31 The Authors tested some mineral and vegetal (from food industries) WCOs as solvents for n-heptane, ethyl-acetate, 2-propanol, methylisobutylketone (MIBK), toluene, m-xylene and 1,3,5trimethylbenzene. The oleic phase enriched by the organic pollutants was then treated in a Two-Phase Partitioning Bioreactor (TPPB), where the VOCs degradation was achieved by selected microorganisms.…”

Recycling of Waste Cooking Oils: Variation of the Chemical Composition during Water Treatment

“…In addition, some recent application of recycled WCOs involve the production of eco-friendly biodegradable solvents, 18 the use as additive for bio-asphalts and bio-concrete, 19,20 and its exploiting as non-aqueous gas sorbents devices. 21,22 Independently to the specific production, WCOs are usually pre-treated, sometimes by the same collectors, and transformed in regenerated low quality oleic derivative. This first stage of recycling gives a product with a low market values, which is sold to other industries for further transformations.…”