Regeneration and long-term stability of surfactant-modified zeolite for removal of volatile organic compounds from produced water

摘要: Abstract We report the results of laboratory-scale evaluation a produced-water treatment system. The system used surfactant-modified zeolite (SMZ) to strip volatile organic compounds benzene, toluene, ethylbenzene, and p -, m - o -xylene (BTEX) from produced water generated as byproduct oil gas recovery. laboratory column studies (1) investigate how different airflow rates impact regeneration BTEX-saturated SMZ (2) perform long-term tests determine chemical physical stability in Varying rate 1.3 10 pore volumes (PV) per minute did not significantly affect BTEX removal rates. Rather, was controlled by total number PV that passed through bed, suggesting only minor kinetic effects on regeneration. sorption profiles varied little over 50 sorption/regeneration cycles. Each cycle consisted 100 PV followed with approximately 2000 PV air. A weakly decreasing trend observed for distribution coefficients ( K d ), indicating small loss affinity after maintained even though 24% original surfactant washed off 5000 PV water. hydraulic conductivity decreased roughly 30% Most likely caused particle attrition. suggest is viable sorbent organics oil- gas-field wastewaters.