Treating organic cyanide-containing groundwater by immobilization of a nitrile-degrading bacterium with a biofilm-forming bacterium using fluidized bed reactors.

摘要: Organic cyanide are widely used as an ingredient in the production of plastics, synthetic rubbers, polymers, pharmaceuticals and pesticides or laboratories industries solvents. Although nitrile-containing wastewater is subjected to primary secondary treatments, residual nitriles may slowly seep further migrate through groundwater, resulting micropollution groundwater by organic pollutants. In this study, water samples were collected from different study areas North China during a period 3y (from 2013 2015) analyzed evaluate (CN-) contamination groundwater. Three parallel lab-scale fluidized bed reactors (FBRs) tested for their ability remove The concentration increased significantly (P < 0.05) 2015. With optimal hydraulic residence time (HRT) 54 min, reactor R3 (inoculated with nitrile-degrading bacterium, BX2, biofilm-forming M1) effectively removed 99.8% CN- under steady operation, which was better than that other reactors. Short-term shutdowns FBRs had no serious effects on efficiency treating cyanide. This work demonstrated bacterium could facilitate fixation enhance removing