Development of combined coagulation-hydrolysis acidification-dynamic membrane bioreactor system for treatment of oilfield polymer-flooding wastewater
Xue Shen1, Lei Lu2, Baoyu Gao1(), Xing Xu1(), Qinyan Yue1
1. Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China 2. College of Chemical Engineering, China University of Petroleum, Qingdao 266580, China
• We created a combined system for treating oilfield polymer-flooding wastewater.
• The system was composed of coagulation, hydrolysis acidification and DMBR.
• Coagulant integrated with demulsifier dominated the removal of crude oil.
• The DMBR proceed efficiently without serious membrane fouling.
A combined system composed of coagulation, hydrolysis acidification and dynamic membrane bioreactor (DMBR) was developed for treating the wastewater produced from polymer flooding. Performance and mechanism of the combined system as well as its respective units were also evaluated. The combined system has shown high-capacity to remove all contaminants in the influent. In this work, the coagulant, polyacrylamide-dimethyldiallyammonium chloride-butylacrylate terpolymer (P(DMDAAC-AM-BA)), integrated with demulsifier (SD-46) could remove 91.8% of crude oil and 70.8% of COD. Hydrolysis acidification unit improved the biodegradability of the influent and the experimental results showed that the highest acidification efficiency in hydrolysis acidification reactor was 20.36% under hydraulic retention time of 7 h. The DMBR proceeded efficiently without serious blockage process of membrane fouling, and the concentration of ammonia nitrogen (NH3-N), oil, chemical oxygen demand and biological oxygen demand in effluent were determined to be 3.4±2.1, 0.3±0.6, 89.7±21.3 and 13±4.7 mg/L.
Integrated wastewater discharge standard II (mg/L) (GB 8978-1996)
Influent
After coagulation (Removal efficiency)
After hydrolysis acidification (Removal efficiency)
After DMBR (Removal efficiency)
COD
612.2±99.8
178.9±40 (70.8%)
147.1±45 (17.8%)
89.7±21.3 (39.0%)
60
SS
209.4±60
17.2±4.4 (91.7%)
15.7±5.2 (8.7%)
2.1±1.2 (86.6%)
70
BOD
125±33
47±12.2 (62.4%)
65±14.8 (-38.3%)
13±4.7 (75.8%)
20
BOD/COD
0.21
0.26
0.42
0.13
–
Oil
638.9±123
52.5±10.3 (91.8%)
17.8±6.2 (66.1%)
0.3±0.6 (96.4%)
5
NH3-N
28.7±6.2
25.3±5.9 (11.8%)
26.3±4.7 (-4.0%)
3.4±2.1 (87.1%)
15
Phosphate
3.1±1.8
1.2±0.8 (59.4%)
1.2±0.8 (0%)
0.4±0.5 (67.7%)
0.5
Tab.1
Parameters
Value
MLSS (g/L)
3–4
HRT (h)
8
SRT (d)
30
Operating flux (L/m2/h)
30
Aeration rate (m3/h)
0.5–0.6
Dissolve oxygen concentration (mg/L)
2–4
Tab.2
Fig.1
Fig.2
Fig.3
Fig.4
Oil wastewaters
Capacity
References
1240±119 mg/L COD, 15±1.8 mg/L oil (oily wastewater from oilfields)
90% of oil, 86.2% of COD
(Pendashteh et al., 2012)
555 mg/L COD (Synthetic oily wastewater)
90.3% of COD removal
(Yuliwati et al., 2012)
50–200 mg/L oil (Oil–water emulsion)
93% oil
(Mittal et al., 2011)
26 mg/L oil/grease, and 141 mg/L TOC
85% of oil, 95% of TOC
(Abadi et al., 2011)
78 mg/L oil (Industrial oily wastewater)
97.2% of oil
(Salahi et al., 2010)
125–250 mg/L oil (Synthetic oil-in-water)
98.8% of oil
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10–22 mg/L oil (Produced water and sea sediment)
100% of oil
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17.8±6.2 mg/L oil (After HA process)
96.4% of oil (DMBR only)
This work
638.9±123 mg/L of oil (Influent of the combined system)
99.95% of oil (combined system)
This work
Tab.3
Fig.5
Fig.6
Fig.7
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