Abstract
Polyaluminum chloride (PACl) coagulant and poly (dimethyl diallyl ammonium chloride-AM) flocculants were applied to purify the wastewater from Zhanazhol oilfield, Kazakhstan. Water quality measurement showed that suspended solids content (SS) and particles size in wastewater were in excess of the reinjection standard for Kazakhstan. The SEM–EDX analysis indicated that suspended solids consisted clay particles and iron compounds. The latter could be generated from mental corrosion due to high concentration of salinity, hydrogen sulphide (H2S) and chloride ion. Jar test was conducted to investigate the effects of chemical agents dosage, settling time and Ca2+ ion concentration on removal of suspended solids from oilfield wastewater. Test results showed that PACl coagulant and DMDAAC polymer flocculant could significantly improve the separating velocity and removal rate of suspended solids. Their synergistic effect could strengthen the electric neutralization and increase the particles size. The flocculation effect increased through extending settling time. But Ca2+ concentration increase could reduce flocculation effect to a certain extent. Compared to raw wastewater, the SS content in treated wastewater could be reduced by 89.3% at optimal dose. Meanwhile, the particles size decreased from 8 microns for raw wastewater to less than 3 microns for treated wastewater. This paper had implied the characteristics of suspended solids in Zhanazhol oilfield wastewater with high salinity and hydrogen sulphide (H2S). Moreover, this study provides further understanding of the performance of poly(dimethyl diallyl ammonium chloride-acrylamide) flocculant for purifying oilfield wastewater. The results laid a good foundation for subsequent wastewater treatment to achieve the quality standard of injection water.
Copyright 2017, Shaanxi Petroleum Society.
This paper was prepared for presentation at the 2017 International Petroleum and Petrochemical Technology Conference in Beijing, China, 20–22 March, 2017.
This paper was selected for presentation by the IFEDC&IPPTC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IFEDC&IPPTC Committee and are subject to correction by the author(s). The material does not necessarily reflect any position of the IFEDC&IPPTC Committee, its members. Papers presented at the Conference are subject to publication review by Professional Committee of Petroleum Engineering of Shaanxi Petroleum Society. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of Shaanxi Petroleum Society is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IFEDC & IPPTC. Contact email: paper@ifedc.org or paper@ipptc.org.
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Acknowledgements
The research has been supported under the Oversea Basic Research Development Program, sponsored by PetroChina Company Limited. The authors are also thankful to Lun Zhao for experiment advices.
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Liu, G. et al. (2019). Studies on Oilfield Wastewater Purification with PACL and DMDAAC Polymer Flocculant. In: Qu, Z., Lin, J. (eds) Proceedings of the International Field Exploration and Development Conference 2017. Springer Series in Geomechanics and Geoengineering. Springer, Singapore. https://doi.org/10.1007/978-981-10-7560-5_55
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DOI: https://doi.org/10.1007/978-981-10-7560-5_55
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