A novel,joint immobilization method was developed by using sodium alginate,coupled with biochar,to immobilize the dicamba-degrading Acidovorax delafieldii XD-3 strain.The results indicated that the mechanical strength and mass transfer performance of sodium alginate-biochar joint immobilization beads were significantly higher than that of sodium alginate immobilized beads.The results from scanning electron microscopy also revealed that sodium alginate-biochar joint immobilized beads were more suitable for d...