Effects of membrane property and hydrostatic pressure on the performance of gravity-driven membrane for shale gas flowback and produced water treatment

摘要: Abstract Hydraulic fracturing of shale gas extraction generates numerous flowback and produced water (FPW), which will cause huge pollution if not properly treated. Gravity-driven membrane with economic advantages was applied as a pretreatment for desalinating this wastewater. The effects materials (polyvinylidene fluoride (PVDF) polyvinylchloride (PVC)) different mean pore sizes, porosities, contact angles, pure permeabilities hydrostatic pressures (40 120 mbar) were investigated. setups operated 90 days the fluxes stabilized at about 0.87–1.00 L/(m2 h). PVDF membranes higher price, had 6 % stable than PVC membranes, extracellular polymeric substances (EPS) contents in fouling layer 10 %–20 lower those membranes. At pressures, increased by only 8 %, but total resistances nearly 180 there more EPS, dissolved organic carbon, Na+, Ca2+, Mg2+, Cl− NO3− on mbar. A denser cake formed pressure, observed scanning electron microscope energy dispersive spectroscopy. Membrane properties no significant effect permeate quality (p > 0.05).