Bioaugmented soil aquifer treatment for P-nitrophenol removal in wastewater unique for cold regions.

摘要: Abstract P-nitrophenol (PNP) is a toxic and recalcitrant organic pollutant usual intermediate in the production of fine chemicals, which has posed significant threat to subsurface environment safety. Soil aquifer treatment (SAT) promising method remove remediate contamination vadose zone with low cost high efficiency. However, there are still research gaps for contaminants by SAT cold regions, such as un-robust indigenous microbes temperature constraint zone. The bioaugmentation technology was first introduced into order enhance removal ability PNP operated regions this study. A high-efficiency PNP-degrading bacterium successfully isolated, can efficiently degrade below 200 mg L−1 degradation rate above 99% at 15 °C close real added bioaugmentation. feasibility bioaugmented associated process were investigated laboratory sand columns, along effects operative parameters (namely loading concentration, flow soil saturation level SAT). Within range stresses tested (1–200 mg L−1), efficiency optimal constant 219 mL d−1 unsaturated operating condition under among all experimental conditions. Longer hydraulic residence time increased rate, although accumulated mass removed reduced efficiencies remained SAT. It found from comparison between removals via both saturated columns that slight difference only observed highly efficient completely 10 mg L−1 within 5 wetting/drying cycles scenarios.