The Research of Micro-Flocculation Suspended Sludge Filtration Technology in the Treatment of Oilfield Wastewater

Abstract:

Enhanced Oil Recovery has been used in most oil field of China, but the oil field wastewater was more difficult to treat than that from water flooding. In this paper, FX flocculants (FX-F) prepared in our laboratory was chosen as the optimal flocculants compared with aluminium polychlorid (PAC), polyaluminium ferric chloride (PAFC). The optimal dosage of FX flocculants was 4 mg/L based on the field test, at which the SS content of treated oil field wastewater reduced sharply within 10 hours. The 15 mg/L of the FX-F would be the most convenient to form the sludge layer. Taking FX-F as flocculants, the oil field wastewater was treated in the micro-flocculation suspended sludge filtration process, and the results showed that the SS and Oil of wastewater could be significantly be reduced. In the end, the average oil content was lower than 1 mg/L and the removal rate can reach 99%, and the average content and the removal efficiency of SS was 1.26 mg/L and 95% respectively, which can really meet the standards for oil field rejection water.

• Periodical: Advanced Materials Research (Volume 742)
• Pages: 257-261
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.742.257
• Online since: August 2013
• Authors: Jin Lai Feng, Lei Zhang, Song Wang, Ye Ming Zeng
• Keywords: FX Flocculants, Micro-Flocculation Suspended Sludge, Oil, Oilfield Wastewater, Suspend Solids

References

[1] Deng S., Zhou F. & Chen Z., 2002; Effects of polyacrylamide on settling and separation of oil droplets in polymer flooding produced water, Environ. Sci. 23(2),p.69–72.

[2] Bartelds G.A., Bruining1 J. & Molenaar J., 1997; The modeling of velocity enhancement in polymer flooding, Transport Porous Med. 26, p.75–88.

[3] Besra L., Sengupta D.K., Roy S.K., Ay R., 2003; Influence of surfactants on flocculation and dewatering of kaolin suspensions by cationic polyacrylamide (PAM-C) flocculant, Sep. Purif. Technol. 30, p.251–264

DOI: 10.1016/s1383-5866(02)00164-8

[4] Gao Y.W., Cao H.D., Chang Z., Zhang R.F., Gao W.B., 2005; Comprehensive exploitation of water resource when developing oil and gas field in Northern Shaanxi province, Journal of Earth Sciences and Environment, 27(4), pp.75-78

[5] Larik Man R. D.. 1987; An Overview of Filtration. AWWA,79(12), p.2~10.

[6] Jing Z., Xiaojuan S., Cheli W., 2003; Treatment of oily wastewater produced from refinery processes using flocculation and ceramic membrane filtration, Sep. Purif. Technol. 32, p.93–98

DOI: 10.1016/s1383-5866(03)00067-4

[7] Tobiason J. E.and Mejia C. R. O. 1998; Physicochemical spects of particle Removal in Depth Filtration.AWWA, ,80(4), p.405~412

[8] Daniel S., Lars W., 2003; Adsorption and flocculation behavior of cationic polyacrylamide and colloidal silica, Colloid Surf. A. 219, p.161–172.

[9] Qian J.W., Xiang X.J., Yang W.Y., Wang M., Zheng B.Q., 2004; Flocculation performance of different polyacrylamide and the relation between optimal dose and critical concentration, Eur. Polym. J. 40, p.1699–1704.

DOI: 10.1016/j.eurpolymj.2004.03.009

[10] Yao C. and Tien C., 1993; Approximate Solution of Intraparticle Diffusion Equations and their Application to Continuous-flow Stirred Tank and Fixed-bed Adsorption Calculations. Chemical Engineering Science, 48, p.187

DOI: 10.1016/0956-9618(94)80008-1