Degradation of benzo(a)pyrene in Yangtze River source water with functional strains

Abstract

Degradation of benzo(a)pyrene (BaP) existing in the Yangtze River, used as source water for Nanjing City, China, was investigated with functional strains. The removal rates of BaP were 37.5, 20.8 and 70.8% for the three strains of the native bacterium NJ, and the two functional strains of Xhhh and Fhhh, respectively. The Fhhh specific degradation rate of BaP was 3.02 x 10(-6) day(-1), which was 1.9-fold of the rate with NJ and 3.7-fold of the rate with Xhhh. The concentrations of BaP in the source water, tap water and Fhhh reactor effluent were 8.3-, 7.6-, and 2.4-fold of that of the oral carcinogenicity unit risk. The results suggest that the functional strain Fhhh could be used for the reduction of BaP concentrations in source water and hence reduction of carcinogenic risk.

Influence of Carbon and Nitrogen Nutrient Supplementations on Biodegradation of Lignin by Interkingdom Fusants

“…The two fusants simultaneously inherited high capacities of degradation, flocculation, and adaptation from its three parental strains. 10 The experimental results of biodegradation kinetics demonstrated that the functional strains were characterized with high biodegradation capacity of pharmaceutical and petrochemical, 11 which was further confirmed by a pilot study. 10 Our group also found that the fusants, obtained by IKPF, had excellent capacity of degrading lignin and pentachlorophenol.…”

Influences of hydraulic loading rate on SVOC removal and microbial community structure in drinking water treatment biofilters

“…These properties stand against their ready microbial utilization and result into the need of a longer retention time for their biodegradation in bioreactors. In our previous study, more than 70% benzo(a)pyrene was removed in the biofilter cultured with functional microorganisms at an HLR of 3.0 m h −1 [11]. Recently, Cai et al [25] has reported that a tricklebed air biofilter had a high efficiency (over 90%) in removing methyl ethyl ketone, toluene, methyl isobutyl ketone and styrene, with empty bed retention time of no less than 2 min.…”

“…Each filter was packed with 2.3 l granular activated carbon (GAC) supported by 1.1 l sand. The parameters related to biofilter design were previously described in detail [11]. The influent water of each biofilter was collected from the effluent of a pilot-scale sand filtration tank in Beihekou water plant.…”

Reduction in health risk induced by semi-volatile organic compounds and metals in a drinking water treatment plant

“…So far, few studies have been conducted to investigate the health risk reduction in drinking water treatment plants. Our previous studies have shown that biofilters can effectively remove the SVOCs in drinking water, but the health risk induced by some PAEs and PAHs in the finished water cannot reach safety levels (Zhang et al 2009(Zhang et al , 2012.…”