The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform

Hua-chun Lan - One of the best experts on this subject based on the ideXlab platform.

  • Enhanced arsenic removal by in situ formed Fe-Mn binary oxide in the aeration-Direct Filtration process.
    Journal of hazardous materials, 2012
    Co-Authors: Rui-ping Liu, Hui-juan Liu, Hua-chun Lan
    Abstract:

    Field studies were conducted to evaluate the feasibility of an in situ formed Fe-Mn binary oxide (in situ FMBO) for improving arsenic (As) removal in the aeration-Direct Filtration process. The transformation and transportation of As, Fe, and Mn in the filter bed were also investigated. The in situ FMBO increased the As removal efficiency by 20-50% to keep the residual As below 10 μg/L. The optimum FMBO dosage was determined to be 0.55 mg/L with the Fe/Mn ratio as 10:1. The removal of Fe, Mn, turbidity, and particles was also improved to a large extent. The in situ FMBO favored the transformation of soluble As, Fe, and Mn into the solid phases, benefiting the removal of these pollutants by the subsequent Filtration. Moreover, the deposited precipitates onto the filter media were characterized, as indicated by the analyses of SEM/EDS and particle size distribution. The long-term experiments exhibited decreased head loss growth and prolonged run length, suggesting an enhanced pollutant catching capacity of the filter media. The full-scale field study with a flow of 10,000 m3/d confirmed positive effects of in situ FMBO on As removal, with the average effluent As concentration reduced from 20 μg/L to 6 μg/L (reagent cost=0.006 ¥/m3).

  • Enhanced arsenic removal by in situ formed Fe-Mn binary oxide in the aeration-Direct Filtration process
    Journal of Hazardous Materials, 2012
    Co-Authors: Rui-ping Liu, Hui-juan Liu, Hua-chun Lan
    Abstract:

    Field studies were conducted to evaluate the feasibility of an in situ formed Fe-Mn binary oxide (in situ FMBO) for improving arsenic (As) removal in the aeration-Direct Filtration process. The transformation and transportation of As, Fe, and Mn in the filter bed were also investigated. The in situ FMBO increased the As removal efficiency by 20-50% to keep the residual As below 10 mu g/L. The optimum FMBO dosage was determined to be 0.55 mg/L with the Fe/Mn ratio as 10:1. The removal of Fe, Mn, turbidity, and particles was also improved to a large extent. The in situ FMBO favored the transformation of soluble As, Fe, and Mn into the solid phases, benefiting the removal of these pollutants by the subsequent Filtration. Moreover, the deposited precipitates onto the filter media were characterized, as indicated by the analyses of SEM/EDS and particle size distribution. The long-term experiments exhibited decreased head loss growth and prolonged run length, suggesting an enhanced pollutant catching capacity of the filter media. The full-scale field study with a flow of 10,000 m(3)/d confirmed positive effects of in situ FMBO on As removal, with the average effluent As concentration reduced from 20 mu g/L to 6 mu g/L (reagent cost = 0.006 (sic)/m(3)). (C) 2012 Elsevier B.V. All rights reserved.

Rui-ping Liu - One of the best experts on this subject based on the ideXlab platform.

  • Enhanced arsenic removal by in situ formed Fe-Mn binary oxide in the aeration-Direct Filtration process.
    Journal of hazardous materials, 2012
    Co-Authors: Rui-ping Liu, Hui-juan Liu, Hua-chun Lan
    Abstract:

    Field studies were conducted to evaluate the feasibility of an in situ formed Fe-Mn binary oxide (in situ FMBO) for improving arsenic (As) removal in the aeration-Direct Filtration process. The transformation and transportation of As, Fe, and Mn in the filter bed were also investigated. The in situ FMBO increased the As removal efficiency by 20-50% to keep the residual As below 10 μg/L. The optimum FMBO dosage was determined to be 0.55 mg/L with the Fe/Mn ratio as 10:1. The removal of Fe, Mn, turbidity, and particles was also improved to a large extent. The in situ FMBO favored the transformation of soluble As, Fe, and Mn into the solid phases, benefiting the removal of these pollutants by the subsequent Filtration. Moreover, the deposited precipitates onto the filter media were characterized, as indicated by the analyses of SEM/EDS and particle size distribution. The long-term experiments exhibited decreased head loss growth and prolonged run length, suggesting an enhanced pollutant catching capacity of the filter media. The full-scale field study with a flow of 10,000 m3/d confirmed positive effects of in situ FMBO on As removal, with the average effluent As concentration reduced from 20 μg/L to 6 μg/L (reagent cost=0.006 ¥/m3).

  • Enhanced arsenic removal by in situ formed Fe-Mn binary oxide in the aeration-Direct Filtration process
    Journal of Hazardous Materials, 2012
    Co-Authors: Rui-ping Liu, Hui-juan Liu, Hua-chun Lan
    Abstract:

    Field studies were conducted to evaluate the feasibility of an in situ formed Fe-Mn binary oxide (in situ FMBO) for improving arsenic (As) removal in the aeration-Direct Filtration process. The transformation and transportation of As, Fe, and Mn in the filter bed were also investigated. The in situ FMBO increased the As removal efficiency by 20-50% to keep the residual As below 10 mu g/L. The optimum FMBO dosage was determined to be 0.55 mg/L with the Fe/Mn ratio as 10:1. The removal of Fe, Mn, turbidity, and particles was also improved to a large extent. The in situ FMBO favored the transformation of soluble As, Fe, and Mn into the solid phases, benefiting the removal of these pollutants by the subsequent Filtration. Moreover, the deposited precipitates onto the filter media were characterized, as indicated by the analyses of SEM/EDS and particle size distribution. The long-term experiments exhibited decreased head loss growth and prolonged run length, suggesting an enhanced pollutant catching capacity of the filter media. The full-scale field study with a flow of 10,000 m(3)/d confirmed positive effects of in situ FMBO on As removal, with the average effluent As concentration reduced from 20 mu g/L to 6 mu g/L (reagent cost = 0.006 (sic)/m(3)). (C) 2012 Elsevier B.V. All rights reserved.

Hui-juan Liu - One of the best experts on this subject based on the ideXlab platform.

  • Enhanced arsenic removal by in situ formed Fe-Mn binary oxide in the aeration-Direct Filtration process.
    Journal of hazardous materials, 2012
    Co-Authors: Rui-ping Liu, Hui-juan Liu, Hua-chun Lan
    Abstract:

    Field studies were conducted to evaluate the feasibility of an in situ formed Fe-Mn binary oxide (in situ FMBO) for improving arsenic (As) removal in the aeration-Direct Filtration process. The transformation and transportation of As, Fe, and Mn in the filter bed were also investigated. The in situ FMBO increased the As removal efficiency by 20-50% to keep the residual As below 10 μg/L. The optimum FMBO dosage was determined to be 0.55 mg/L with the Fe/Mn ratio as 10:1. The removal of Fe, Mn, turbidity, and particles was also improved to a large extent. The in situ FMBO favored the transformation of soluble As, Fe, and Mn into the solid phases, benefiting the removal of these pollutants by the subsequent Filtration. Moreover, the deposited precipitates onto the filter media were characterized, as indicated by the analyses of SEM/EDS and particle size distribution. The long-term experiments exhibited decreased head loss growth and prolonged run length, suggesting an enhanced pollutant catching capacity of the filter media. The full-scale field study with a flow of 10,000 m3/d confirmed positive effects of in situ FMBO on As removal, with the average effluent As concentration reduced from 20 μg/L to 6 μg/L (reagent cost=0.006 ¥/m3).

  • Enhanced arsenic removal by in situ formed Fe-Mn binary oxide in the aeration-Direct Filtration process
    Journal of Hazardous Materials, 2012
    Co-Authors: Rui-ping Liu, Hui-juan Liu, Hua-chun Lan
    Abstract:

    Field studies were conducted to evaluate the feasibility of an in situ formed Fe-Mn binary oxide (in situ FMBO) for improving arsenic (As) removal in the aeration-Direct Filtration process. The transformation and transportation of As, Fe, and Mn in the filter bed were also investigated. The in situ FMBO increased the As removal efficiency by 20-50% to keep the residual As below 10 mu g/L. The optimum FMBO dosage was determined to be 0.55 mg/L with the Fe/Mn ratio as 10:1. The removal of Fe, Mn, turbidity, and particles was also improved to a large extent. The in situ FMBO favored the transformation of soluble As, Fe, and Mn into the solid phases, benefiting the removal of these pollutants by the subsequent Filtration. Moreover, the deposited precipitates onto the filter media were characterized, as indicated by the analyses of SEM/EDS and particle size distribution. The long-term experiments exhibited decreased head loss growth and prolonged run length, suggesting an enhanced pollutant catching capacity of the filter media. The full-scale field study with a flow of 10,000 m(3)/d confirmed positive effects of in situ FMBO on As removal, with the average effluent As concentration reduced from 20 mu g/L to 6 mu g/L (reagent cost = 0.006 (sic)/m(3)). (C) 2012 Elsevier B.V. All rights reserved.

Sílvia Corrêa Oliveira - One of the best experts on this subject based on the ideXlab platform.

  • Applicability of statistical analysis for performance and reliability evaluation of large-scale water treatment plants with Direct Filtration systems
    Environmental Science and Pollution Research, 2021
    Co-Authors: Lívia Duarte Ventura Melo, Gabriela Rodrigues Barroso, Raíssa Santos Figueiredo, Elizângela Pinheiro Costa, Sílvia Corrêa Oliveira
    Abstract:

    Water treatment plants (WTPs) are extremely important in basic sanitation services because of their association with human health by producing safe drinking water. Thus, their proper operation is of utmost relevance and has led to the development of distinct performance evaluation methodologies. Direct Filtration is a leading technology applied in WTPs. However, although it costs less than conventional treatment, it might also be less flexible and robust. To evaluate performance with data from real-scale WTPs with Direct Filtration systems, the use of a statistical analysis methodology for turbidity, apparent color, and pH data from raw and effluent water is proposed. Reliability analysis, a probabilistic-based methodology, was applied for turbidity alongside evaluating the compliance of the treated water with different potability standards. The parameters pH (between 6.0 and 8.0) and apparent color ( 99%). Reliability analysis could not be applied for apparent color and pH, while apparent color did not adhere to the lognormal distribution frequency. The turbidity results show high variability in the coefficients of variation and reliability among various plants and a general difficulty in complying with stricter standards, such as the 0.1 and 0.3 NTU defined by the United States Environmental Protection Agency. All WTP studies show a 95% compliance with the World Health Organization standard of 5.0 NTU. A higher value for the coefficient of reliability and a lower value for the variation coefficient could indicate a more stable process, regardless of the treated water quality, highlighting the relevance of applying combined methods for performance evaluation, such as compliance with established standards.

Philip Williams - One of the best experts on this subject based on the ideXlab platform.

  • Effect of Ozonation and UV Irradiation with Direct Filtration on Disinfection and Disinfection by-Product Precursors in Drinking Water Treatment
    Environmental technology, 2001
    Co-Authors: Y. Amirsardari, Philip Williams
    Abstract:

    Pilot plant studies were conducted to evaluate the effect of pre-ozonation and ultraviolet irradiation on disinfection, disinfection by-product precursors and water quality in a Direct Filtration water treatment system. Disinfection parameters including total coliforms, faecal coliforms and heterotrophic plate count were investigated. Total organic carbon (TOC), trihalomethanes (THMs), total organic halides (TOX), filtered water turbidity and colour were also evaluated. It was found that advanced pre-oxidation processes (ozonation and UV irradiation) significantly increase the level of disinfection of raw water. Removal of total trihalomethanes and total organic halides precursors improved with ozonation and UV irradiation, compared to no oxidation treatment in Direct Filtration and/or in conventional water treatment. All coliforms (total and faecal) were completely destroyed by ozonation alone, and also with ozonation in conjunction with UV irradiation. However, the heterotrophic plate count was not sign...

  • Effects of Pre-Ozonation of High Humic Content Waters on Direct Filtration in a Pilot Plant
    Environmental Technology, 1998
    Co-Authors: Y. Amirsardari, Philip Williams
    Abstract:

    Direct Filtration and the effects of pre-ozonation on Direct Filtration performance were evaluated and compared with conventional water treatment performance in a pilot plant study. Performance measures including coagulant demand, turbidity, colour, total organic carbon, head loss development, filter run time, back wash water consumption, Filtration solids volume and iron and manganese were examined for a water source with low turbidity and high organic matter content. The optimal coagulant dosage established for in-line Direct Filtration was much lower than that required for conventional treatment of the same raw water. Direct Filtration preceded by ozonation achieved similar, or substantially higher, turbidity removal efficiencies with a significantly lower alum coagulant dosage. Pre-ozonation was effective in lowering turbidity, colour, head loss development and iron and manganese levels but was not significant in removing TOC. Pre-ozonation increased filter run time by about 7% when compared with the ...

  • Effects of Ozonation and Coagulation on Turbidity and TOC Removal by Simulated Direct Filtration for Potable Water Treatment
    Environmental Technology, 1997
    Co-Authors: Y. Amirsardari, Philip Williams
    Abstract:

    Bench scale studies were conducted to evaluate the efficacy of pre-ozonation on the treatment of surface water in conjunction with simulated Direct Filtration. Water quality parameters including turbidity, total organic carbon (TOC), UV absorbance and manganese were investigated at different pH conditions. It was found that pre-ozonation followed by alum coagulation under acidic conditions resulted in a 30% reduction in turbidity when compared with the case of no ozonation treatment and coagulation without pH adjustment. There was a 64% reduction in coagulant usage in terms of turbidity reduction requirements. The optimal ozone dose for turbidity reduction was about 1.5 mg l−1. Total organic carbon was slightly reduced (about 10%) with ozonation and no pH adjustment and also slightly reduced (about 7%) at a lowered pH of 6 at ozone doses ranging from 0.0 to 7.16 mg l−1. With ozone doses ranging from 0.0 to 7.16 mg l−1, UV absorbance was reduced by about 24% by ozonation. The maximum manganese removal achi...