MilliporeSigma
  • Home
  • Search Results
  • Treatment of steam-assisted gravity drainage water using low coagulant dose and Fenton oxidation.

Treatment of steam-assisted gravity drainage water using low coagulant dose and Fenton oxidation.

Environmental technology (2014-06-25)
Ahmad Al-As'ad, Maen M Husein
ABSTRACT

The use of coagulation and Fenton oxidation was studied for total organic carbon (TOC) and silica removal from steam-assisted gravity drainage (SAGD) water at 800C and two different concentrations replicating the stream feeding the warm lime softening unit having 675 mg/L TOC and 350 mg/L silica and the blowdown of the once through steam generator having 3700mg/L TOC and 2585 mg/L silica. Coagulation was carried out by the addition of FeCl3, Al(NO3)3 or Ca(NO3)2. The results showed that Fe(III) salt outperformed Al(III) and Ca(II) salts. A two-stage addition of 2.5 g FeCl3 per g TOC intermediated by a filtration unit resulted in approximately 72% TOC removal and more than 80% silica removal while maintaining low solid waste. Comparing results pertaining to coagulant concentration and final pH, it can be easily concluded that silica removal is governed by the resultant pH, whereas TOC removal was accomplished through surface neutralization and localized enmeshment coagulation. Fenton oxidation is proposed to further treat the filtrate obtained from the second stage Fe(III) coagulation. An additional 10% TOC removal could be achieved; at seven times lower H202 dose in the presence of Fe2+ or Fe0 reagent. Moreover, the advanced Fenton process resulted in high silica removal as a result of adsorption onto Fe(OH)3 precipitate, which formed at the equilibrium pH of the system.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
LUDOX® TM-40 colloidal silica, 40 wt. % suspension in H2O
Sigma-Aldrich
LUDOX® LS colloidal silica, 30 wt. % suspension in H2O
Sigma-Aldrich
LUDOX® HS-30 colloidal silica, 30 wt. % suspension in H2O
Sigma-Aldrich
Iron, foil, thickness 0.1 mm, ≥99.9% trace metals basis
Sigma-Aldrich
Silica
Sigma-Aldrich
Iron, chips, 99.98% trace metals basis
Sigma-Aldrich
Hydrogen peroxide solution, contains potassium stannate as inhibitor, 30-32 wt. % in water, semiconductor grade, 99.999% trace metals basis
Sigma-Aldrich
LUDOX® SM colloidal silica, 30 wt. % suspension in H2O
Sigma-Aldrich
Iron, wire, diam. 0.5 mm, ≥99.9% trace metals basis
Millipore
Hydrogen peroxide solution, 3%, suitable for microbiology
Sigma-Aldrich
Iron, puriss. p.a., carbonyl-Iron powder, low in magnesium and manganese compounds, ≥99.5% (RT)
Sigma-Aldrich
Hydrogen peroxide solution, tested according to Ph. Eur.
Sigma-Aldrich
Silica, mesostructured, MSU-F (cellular foam)
Sigma-Aldrich
Hydrogen peroxide solution, 34.5-36.5%
Supelco
Hydrogen peroxide solution, ≥30%, for trace analysis
Iron, IRMM®, certified reference material, 0.5 mm wire
Sigma-Aldrich
Hydrogen peroxide solution, 30 % (w/w) in H2O, contains stabilizer
Sigma-Aldrich
Silica, nanopowder, spec. surface area 175-225 m2/g (BET), 99.8% trace metals basis
Sigma-Aldrich
Iron, rod, diam. 6.3 mm, 99.98% trace metals basis
Sigma-Aldrich
LUDOX® CL colloidal silica, 30 wt. % suspension in H2O
Supelco
Hydrogen peroxide solution, 30 % (w/w), for ultratrace analysis
Sigma-Aldrich
Silicon dioxide, nanopowder (spherical, porous), 5-20 nm particle size (TEM), 99.5% trace metals basis
Sigma-Aldrich
Silica, mesostructured, MCM-41 type (hexagonal)
Sigma-Aldrich
Silicon dioxide, nanopowder, 10-20 nm particle size (BET), 99.5% trace metals basis
Iron, foil, 1m coil, thickness 0.1mm, hard, 99.5%
Iron, foil, 15mm disks, thickness 0.003mm, 99.85%
Iron, foil, 10mm disks, thickness 0.025mm, as rolled, 99.99+%
Iron, foil, 10mm disks, thickness 0.25mm, as rolled, 99.99+%
Iron, foil, 1m coil, thickness 0.05mm, hard, 99.5%
Iron, foil, 20m coil, thickness 0.038mm, hard, 99.5%