Immobilization of Photosynthetic Bacteria for Oily Wastewater Treatment

Photosynthetic bacteria Rhodobacter sphaeroides(PSBRS)was immobilized to treat oily wastewater.Three different embedding materials were compared for the oil removal effect of the immobilized PSBRS.The process for removing oil was optimized and the degradation of fatty acids in oily wastewater was also analyzed.The gel complex with 2% zeolite and 2% sodium alginate was selected after comparison for co-immobilization,with a diameter of 4 mm of the immobilized granule and an embedding ratio of 1:2.After 6 days treatment with 10 g·L-1 granules under aerobic conditions in the darkness,the oil,NH4+ -N,and PO34-in the wastewater were removed by 80.1%,87.4% and 96.3%.The amount of oil removed by immobilized PSBRS was 50% higher than that by the same bacteria without immobilization.Fatty acids were also largely removed by immobilized PSBRS.This work is beneficial to the screening and immobilization of microorganisms for efficient treatment of oily wastewater.