The Experts below are selected from a list of 5733 Experts worldwide ranked by ideXlab platform

Ian R Baxendale - One of the best experts on this subject based on the ideXlab platform.

Jie Zhang - One of the best experts on this subject based on the ideXlab platform.

  • startup and stable operation of advanced Continuous Flow Reactor and the changes of microbial communities in aerobic granular sludge
    Chemosphere, 2020
    Co-Authors: Shuai Li, Dong Li, Huiping Zeng, Yingqiao Wang, Yixing Yuan, Jie Zhang
    Abstract:

    Abstract In this study, the granular sludge was operated under low aeration condition in sequencing batch Reactor (SBR) and advanced Continuous Flow Reactor (ACFR), respectively. Through increasing the sludge retention time (SRT) from 22 days to 33 days, the ACFR was successful startup in 30 days and achieved long term stable operation. Under SBR operation condition, the aerobic granular sludge (AGS) showed good nitrogen (60%), phosphorus (96%) and COD removal performance. During stable operation of Continuous-Flow, the nitrogen removal efficiency was increasing to 70%, however, the phosphorus removal efficiency could only be restored to 65%. Meanwhile, the sludge discharge volume from ACFR was about half of that in SBR. Results of high-throughput pyrosequencing illustrated that methanogenic archaea (MA), ammonia oxidizing archaea (AOA), denitrifying bacteria (DNB), denitrifying polyphosphate-accumulating organisms (DPAOs) played an important role in the removal of nutrients in ACFR. This study could have positive effect on the practical application of AGS Continuous Flow process for simultaneous biological nutrient removal (SBNR).

  • Effect of aeration modes on simultaneous nitrogen and phosphorus removal and microbial community in a Continuous Flow Reactor with granules
    Bioresource Technology, 2019
    Co-Authors: Shuai Li, Dong Li, Huiping Zeng, Yixing Yuan, Shirui Zhang, Jie Zhang
    Abstract:

    Abstract In this study, a Continuous Flow Reactor with simultaneous nitrification, denitrification and phosphorus removal (SNDPR) granular sludge was operated in the Continuous aeration (CA) and intermittent aeration (IA) modes to examine the effect of aeration on the performance of Continuous-Flow system. Then the experimental results showed that the IA1 mode (4 h aeration and 1 h non-aeration) could improve the simultaneous nitrogen and phosphorus removal and the settleability of granules in Continuous Flow system. Results of high-throughput pyrosequencing illustrated that the methanogens, AOA, ANAMMOX, DNB, denitrifying polyphosphate-accumulating organisms (DPAOs) were the important participant of simultaneous biological nutrients removal (SBNR), meanwhile, the IA1 mode could effectively inhibit the growth of filamentous microorganisms (Thiothrix and Acinetobacter). Finally, a conceptual model of the SNDPR granular microbial ecosystem under IA1 mode was proposed as a base for analyzing the mechanism of simultaneous nutrient removal in Continuous Flow system.

  • startup and stabilization of nitrosation in an anoxic aerobic Continuous Flow Reactor with granules
    Huan jing ke xue= Huanjing kexue, 2019
    Co-Authors: Dong Li, Jie Zhang
    Abstract:

    : Matured nitrosation granules were inoculated to an anoxic-aerobic Continuous-Flow Reactor at room temperature (17-19℃). The startup and stabilization of nitrosation with granules were studied. The results show that the nitrosation of the Continuous-Flow was successfully achieved with an average nitrite accumulation rate (NAR) above 95%. With the increase of the dissolved oxygen (DO) content from (3±0.2) to (4.5±0.2) mg·L-1 in the aerobic zone, the NAR remained above 95%. The effect of the hydraulic retention time (HRT) of the Continuous-Flow Reactor was investigated. The short HRT (8.4 h) sped up the circulation of the sludge particles in the Continuous-Flow system such that the broken granular sludge could not be integrated in time, resulting in the deterioration of granular sludge settling and the loss of sludge granules. The performance of the system was restored with the increase of the HRT to 12.2 h and the Continuous-Flow system stabilized. The ammonia removal efficiency and NAR were 86.7% and 96.2% on day 166, respectively.

  • Enhanced biological phosphorus removal using granules in Continuous-Flow Reactor
    Chemical Engineering Journal, 2016
    Co-Authors: Dong Li, Yufeng Lv, Huiping Zeng, Jie Zhang
    Abstract:

    Abstract To perform the enhanced biological phosphorus removal using granules in Continuous-Flow Reactor (CFR), a novel CFR was designed and applied in this study. During the whole operation process, the variation of efficiency and characteristics of phosphorus removal granular sludge (PRGS) was investigated here. When the PRGS with good efficiency of phosphorus and COD removal was inoculated from a sequencing batch Reactor (SBR) into the CFR, the phosphate and COD removal efficiency reduced from 99% to 64% and from 98% to 79%, respectively. Moreover, the structures of the granules turned looser and unstable, and the mean diameter reduced from about 950 μm to around 600 μm. However, after 24 days of adaptation, the efficiency and diameter recovered to the initial level. The phosphorus and COD removal efficiency increased to 95% and 96%, respectively. Meanwhile, the granules adapting to Continuous-Flow were obtained, and they were characterized with loose structure and irregular shape. In the adaptation period, the PRGS with large size was influenced seriously but that with small size was not when the PRGS was inoculated from the SBR to the CFR. In the initial period of adaptation, the metabolism of PAOs was repressed and then recovered gradually in about 20 days. Finally, the morphological and structural variation mechanism of PRGS in the CFR was discussed, and it would be helpful to guide the operation of Continuous-Flow system based on PRGS in practice.

  • startup and long term operation of enhanced biological phosphorus removal in Continuous Flow Reactor with granules
    Bioresource Technology, 2016
    Co-Authors: Dong Li, Jie Zhang, Yufeng Lv, Huiping Zeng
    Abstract:

    Abstract The startup and long term operation of enhanced biological phosphorus removal (EBPR) in a Continuous-Flow Reactor (CFR) with granules were investigated in this study. Through reducing the settling time from 9 min to 3 min gradually, the startup of EBPR in a CFR with granules was successfully realized in 16 days. Under Continuous-Flow operation, the granules with good phosphorus and COD removal performance were stably operated for more than 6 months. And the granules were characterized with particle size of around 960 μm, loose structure and good settling ability. During the startup phase, polysaccharides (PS) was secreted excessively by microorganisms to resist the influence from the variation of operational mode. Results of relative quantitative PCR indicated that granules dominated by polyphosphate-accumulating organisms (PAOs) were easier accumulated in the CFR because more excellent settling ability was needed in the system.

Laetitia J Martin - One of the best experts on this subject based on the ideXlab platform.

Dong Li - One of the best experts on this subject based on the ideXlab platform.

  • startup and stable operation of advanced Continuous Flow Reactor and the changes of microbial communities in aerobic granular sludge
    Chemosphere, 2020
    Co-Authors: Shuai Li, Dong Li, Huiping Zeng, Yingqiao Wang, Yixing Yuan, Jie Zhang
    Abstract:

    Abstract In this study, the granular sludge was operated under low aeration condition in sequencing batch Reactor (SBR) and advanced Continuous Flow Reactor (ACFR), respectively. Through increasing the sludge retention time (SRT) from 22 days to 33 days, the ACFR was successful startup in 30 days and achieved long term stable operation. Under SBR operation condition, the aerobic granular sludge (AGS) showed good nitrogen (60%), phosphorus (96%) and COD removal performance. During stable operation of Continuous-Flow, the nitrogen removal efficiency was increasing to 70%, however, the phosphorus removal efficiency could only be restored to 65%. Meanwhile, the sludge discharge volume from ACFR was about half of that in SBR. Results of high-throughput pyrosequencing illustrated that methanogenic archaea (MA), ammonia oxidizing archaea (AOA), denitrifying bacteria (DNB), denitrifying polyphosphate-accumulating organisms (DPAOs) played an important role in the removal of nutrients in ACFR. This study could have positive effect on the practical application of AGS Continuous Flow process for simultaneous biological nutrient removal (SBNR).

  • Effect of aeration modes on simultaneous nitrogen and phosphorus removal and microbial community in a Continuous Flow Reactor with granules
    Bioresource Technology, 2019
    Co-Authors: Shuai Li, Dong Li, Huiping Zeng, Yixing Yuan, Shirui Zhang, Jie Zhang
    Abstract:

    Abstract In this study, a Continuous Flow Reactor with simultaneous nitrification, denitrification and phosphorus removal (SNDPR) granular sludge was operated in the Continuous aeration (CA) and intermittent aeration (IA) modes to examine the effect of aeration on the performance of Continuous-Flow system. Then the experimental results showed that the IA1 mode (4 h aeration and 1 h non-aeration) could improve the simultaneous nitrogen and phosphorus removal and the settleability of granules in Continuous Flow system. Results of high-throughput pyrosequencing illustrated that the methanogens, AOA, ANAMMOX, DNB, denitrifying polyphosphate-accumulating organisms (DPAOs) were the important participant of simultaneous biological nutrients removal (SBNR), meanwhile, the IA1 mode could effectively inhibit the growth of filamentous microorganisms (Thiothrix and Acinetobacter). Finally, a conceptual model of the SNDPR granular microbial ecosystem under IA1 mode was proposed as a base for analyzing the mechanism of simultaneous nutrient removal in Continuous Flow system.

  • startup and stabilization of nitrosation in an anoxic aerobic Continuous Flow Reactor with granules
    Huan jing ke xue= Huanjing kexue, 2019
    Co-Authors: Dong Li, Jie Zhang
    Abstract:

    : Matured nitrosation granules were inoculated to an anoxic-aerobic Continuous-Flow Reactor at room temperature (17-19℃). The startup and stabilization of nitrosation with granules were studied. The results show that the nitrosation of the Continuous-Flow was successfully achieved with an average nitrite accumulation rate (NAR) above 95%. With the increase of the dissolved oxygen (DO) content from (3±0.2) to (4.5±0.2) mg·L-1 in the aerobic zone, the NAR remained above 95%. The effect of the hydraulic retention time (HRT) of the Continuous-Flow Reactor was investigated. The short HRT (8.4 h) sped up the circulation of the sludge particles in the Continuous-Flow system such that the broken granular sludge could not be integrated in time, resulting in the deterioration of granular sludge settling and the loss of sludge granules. The performance of the system was restored with the increase of the HRT to 12.2 h and the Continuous-Flow system stabilized. The ammonia removal efficiency and NAR were 86.7% and 96.2% on day 166, respectively.

  • Enhanced biological phosphorus removal using granules in Continuous-Flow Reactor
    Chemical Engineering Journal, 2016
    Co-Authors: Dong Li, Yufeng Lv, Huiping Zeng, Jie Zhang
    Abstract:

    Abstract To perform the enhanced biological phosphorus removal using granules in Continuous-Flow Reactor (CFR), a novel CFR was designed and applied in this study. During the whole operation process, the variation of efficiency and characteristics of phosphorus removal granular sludge (PRGS) was investigated here. When the PRGS with good efficiency of phosphorus and COD removal was inoculated from a sequencing batch Reactor (SBR) into the CFR, the phosphate and COD removal efficiency reduced from 99% to 64% and from 98% to 79%, respectively. Moreover, the structures of the granules turned looser and unstable, and the mean diameter reduced from about 950 μm to around 600 μm. However, after 24 days of adaptation, the efficiency and diameter recovered to the initial level. The phosphorus and COD removal efficiency increased to 95% and 96%, respectively. Meanwhile, the granules adapting to Continuous-Flow were obtained, and they were characterized with loose structure and irregular shape. In the adaptation period, the PRGS with large size was influenced seriously but that with small size was not when the PRGS was inoculated from the SBR to the CFR. In the initial period of adaptation, the metabolism of PAOs was repressed and then recovered gradually in about 20 days. Finally, the morphological and structural variation mechanism of PRGS in the CFR was discussed, and it would be helpful to guide the operation of Continuous-Flow system based on PRGS in practice.

  • startup and long term operation of enhanced biological phosphorus removal in Continuous Flow Reactor with granules
    Bioresource Technology, 2016
    Co-Authors: Dong Li, Jie Zhang, Yufeng Lv, Huiping Zeng
    Abstract:

    Abstract The startup and long term operation of enhanced biological phosphorus removal (EBPR) in a Continuous-Flow Reactor (CFR) with granules were investigated in this study. Through reducing the settling time from 9 min to 3 min gradually, the startup of EBPR in a CFR with granules was successfully realized in 16 days. Under Continuous-Flow operation, the granules with good phosphorus and COD removal performance were stably operated for more than 6 months. And the granules were characterized with particle size of around 960 μm, loose structure and good settling ability. During the startup phase, polysaccharides (PS) was secreted excessively by microorganisms to resist the influence from the variation of operational mode. Results of relative quantitative PCR indicated that granules dominated by polyphosphate-accumulating organisms (PAOs) were easier accumulated in the CFR because more excellent settling ability was needed in the system.

Andreas Marzinzik - One of the best experts on this subject based on the ideXlab platform.