TY - JOUR
T1 - Application of coagulation-UF hybrid process for shale gas fracturing flowback water recycling
T2 - Performance and fouling analysis
AU - Kong, Fan xin
AU - Chen, Jin fu
AU - Wang, He ming
AU - Liu, Xiao ning
AU - Wang, Xiao mao
AU - Wen, Xia
AU - Chen, Chun mao
AU - Xie, Yuefeng F.
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/2/15
Y1 - 2017/2/15
N2 - Shale gas fracturing flowback water (SGFFW) generated during shale gas extraction is of great concern and recycling for another fracking is the common disposal way. In this study, the feasibility of coagulation–UF hybrid process in assisting SGFFW reuse was systematically evaluated. Organics in SGFFW of Fuling were comparable with that reported in Marcellus. Poly aluminium chloride (PAC) dosage of 1500 mg/L may be preferred due to relatively low TOC (16.02 mg/L) and turbidity (3.03 NTU) in permeate and similar water flux (4.0×10−4 m/s) with that under the dosage of 2000 mg/L. With increase dosage of PAC, fouling mechanism changed from complete blocking to intermediate-blocking or cake standard. SEM-EDS indicated foulant was rich in carbon and oxygen with iron oxide and sulfate precipitates. According to volumetric integration method, overall rejection ratio for organics in different region in hybrid process decreased in the order of V (89.0%), IV 86.2%, III (80.3%), II (77.7%), I (55.2%) and VI (49.3%). LC-OCD illustrated coagulation mainly removed the organics with molecular weight of 20 kDa, while UF could remove a fraction of low molecular weight components (i.e., 200 Da). Fouling was reversible by backwashing and thus hybrid process without sedimentation can be potentially used for SGFFW treatment.
AB - Shale gas fracturing flowback water (SGFFW) generated during shale gas extraction is of great concern and recycling for another fracking is the common disposal way. In this study, the feasibility of coagulation–UF hybrid process in assisting SGFFW reuse was systematically evaluated. Organics in SGFFW of Fuling were comparable with that reported in Marcellus. Poly aluminium chloride (PAC) dosage of 1500 mg/L may be preferred due to relatively low TOC (16.02 mg/L) and turbidity (3.03 NTU) in permeate and similar water flux (4.0×10−4 m/s) with that under the dosage of 2000 mg/L. With increase dosage of PAC, fouling mechanism changed from complete blocking to intermediate-blocking or cake standard. SEM-EDS indicated foulant was rich in carbon and oxygen with iron oxide and sulfate precipitates. According to volumetric integration method, overall rejection ratio for organics in different region in hybrid process decreased in the order of V (89.0%), IV 86.2%, III (80.3%), II (77.7%), I (55.2%) and VI (49.3%). LC-OCD illustrated coagulation mainly removed the organics with molecular weight of 20 kDa, while UF could remove a fraction of low molecular weight components (i.e., 200 Da). Fouling was reversible by backwashing and thus hybrid process without sedimentation can be potentially used for SGFFW treatment.
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U2 - 10.1016/j.memsci.2016.11.039
DO - 10.1016/j.memsci.2016.11.039
M3 - Article
AN - SCOPUS:85002373858
SN - 0376-7388
VL - 524
SP - 460
EP - 469
JO - Journal of Membrane Science
JF - Journal of Membrane Science
ER -