Performance of dithiocarbamate-type flocculant in treating simulated polymerflooding produced water
Baoyu Gao , Yuyan Jia , Yongqiang Zhang , Qian Li , Qinyan Yue
DOI:
Received January 14, 2010,Revised March 28, 2010, Accepted , Available online
Volume 23,2011,Pages 37-43
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Produced water from polymer flooding is di cult to treat due to its high polymer concentration, high viscosity, and emulsified
characteristics. The dithiocarbamate flocculant, DTC (T403), was prepared by the amine-terminated polyoxypropane-ether compound
known as Je amine-T403. The product was characterized by IR spectra and elemental analysis. The DTC agent chelating with Fe2+
produced a network polymer matrix, which captured and removed oil droplets e ciently. Oil removal by the flocculent on simulated
produced water with 0, 200, 500, 900 mg/L of partially hydrolyzed polyacrylamide (HPAM) was investigated for aspects of e ectiveness
of DTC (T403) dosage and concentrations of HPAM and Fe2+ ions in the wastewater. Results showed that HPAM had a negative
influence on oil removal e ciency when DTC (T403) dosage was lower than 20 mg/L. However, residual oil concentrations in
tested samples with di erent concentrations of HPAM all decreased below 10 mg/L when DTC (T403) dosage reached 30 mg/L.
The concentration of Fe2+ in the initial wastewater had a slight e ect on oil removal at the range of 2–12 mg/L. Results showed that
Fe3+ could not be used in place of Fe2+ as Fe3+ could not react with DTC under flocculated conditions. The e ects of mineral salts ions
were also investigated.
