Biological Treatment

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A Srinivasan - One of the best experts on this subject based on the ideXlab platform.

  • Biological Treatment processes for fish processing wastewater - A review
    Bioresource Technology, 2010
    Co-Authors: Pankaj Chowdhury, T Viraraghavan, A Srinivasan
    Abstract:

    Water consumption in a fish-processing industry and high-strength wastewater from such an industry are of great concern world-wide. Liquid effluent regulations are becoming more stringent day by day. Biological Treatment is the best option for such a wastewater. Anaerobic processes such as upflow anaerobic sludge blanket (UASB) reactor, anaerobic filter (AF) and anaerobic fluidized bed (AFB) reactor can achieve high (80-90%) organics removal and produce biogas. Aerobic processes such as activated sludge, rotating Biological contactor, trickling filter and lagoons are also suitable for organics removal. Anaerobic digestion followed by an aerobic process is an optimal process option for fish processing wastewater Treatment. © 2009 Elsevier Ltd. All rights reserved.

  • Biological Treatment processes for fish processing wastewater a review
    Bioresource Technology, 2010
    Co-Authors: Pankaj Chowdhury, T Viraraghavan, A Srinivasan
    Abstract:

    Water consumption in a fish-processing industry and high-strength wastewater from such an industry are of great concern world-wide. Liquid effluent regulations are becoming more stringent day by day. Biological Treatment is the best option for such a wastewater. Anaerobic processes such as upflow anaerobic sludge blanket (UASB) reactor, anaerobic filter (AF) and anaerobic fluidized bed (AFB) reactor can achieve high (80-90%) organics removal and produce biogas. Aerobic processes such as activated sludge, rotating Biological contactor, trickling filter and lagoons are also suitable for organics removal. Anaerobic digestion followed by an aerobic process is an optimal process option for fish processing wastewater Treatment.

Pankaj Chowdhury - One of the best experts on this subject based on the ideXlab platform.

  • Biological Treatment processes for fish processing wastewater - A review
    Bioresource Technology, 2010
    Co-Authors: Pankaj Chowdhury, T Viraraghavan, A Srinivasan
    Abstract:

    Water consumption in a fish-processing industry and high-strength wastewater from such an industry are of great concern world-wide. Liquid effluent regulations are becoming more stringent day by day. Biological Treatment is the best option for such a wastewater. Anaerobic processes such as upflow anaerobic sludge blanket (UASB) reactor, anaerobic filter (AF) and anaerobic fluidized bed (AFB) reactor can achieve high (80-90%) organics removal and produce biogas. Aerobic processes such as activated sludge, rotating Biological contactor, trickling filter and lagoons are also suitable for organics removal. Anaerobic digestion followed by an aerobic process is an optimal process option for fish processing wastewater Treatment. © 2009 Elsevier Ltd. All rights reserved.

  • Biological Treatment processes for fish processing wastewater a review
    Bioresource Technology, 2010
    Co-Authors: Pankaj Chowdhury, T Viraraghavan, A Srinivasan
    Abstract:

    Water consumption in a fish-processing industry and high-strength wastewater from such an industry are of great concern world-wide. Liquid effluent regulations are becoming more stringent day by day. Biological Treatment is the best option for such a wastewater. Anaerobic processes such as upflow anaerobic sludge blanket (UASB) reactor, anaerobic filter (AF) and anaerobic fluidized bed (AFB) reactor can achieve high (80-90%) organics removal and produce biogas. Aerobic processes such as activated sludge, rotating Biological contactor, trickling filter and lagoons are also suitable for organics removal. Anaerobic digestion followed by an aerobic process is an optimal process option for fish processing wastewater Treatment.

Fikret Kargi - One of the best experts on this subject based on the ideXlab platform.

  • Adsorbent supplemented Biological Treatment of pre-treated landfill leachate by fed-batch operation.
    Bioresource Technology, 2004
    Co-Authors: Fikret Kargi, M. Yunus Pamukoglu
    Abstract:

    Abstract Biological Treatment of landfill leachate usually results in low COD removals because of high chemical oxygen demand (COD), high ammonium-N content and presence of toxic compounds. Coagulation–flocculation with lime addition and air stripping of ammonia were used as pre-Treatment in this study in order to improve Biological treatability of the leachate. Pre-treated leachate was subjected to adsorbent supplemented Biological Treatment in an aeration tank operated in fed-batch mode. COD and NH 4 -N removal performances of powdered activated carbon (PAC) and powdered zeolite (PZ) were compared during Biological Treatment. Adsorbent concentrations varied between 0 and 5 g l −1 . Percent COD and ammonium-N removals increased with increasing adsorbent concentrations. Percent COD removals with PAC addition were significantly higher than those obtained with the zeolite. However, zeolite performed better than the PAC in ammonium-N removal from the leachate. Nearly 87% and 77% COD removals were achieved with PAC and zeolite concentrations of 2 g l −1 , respectively. Ammonium-N removals were 30% and 40% with PAC and zeolite concentrations of 5 g l −1 , respectively at the end of 30 h of fed-batch operation.

  • Aerobic Biological Treatment of pre-treated landfill leachate by fed-batch operation
    Enzyme and Microbial Technology, 2003
    Co-Authors: Fikret Kargi, M. Yunus Pamukoglu
    Abstract:

    Abstract Landfill leachate obtained from the solid waste landfill area contained high chemical oxygen demand (COD) and ammonium ions which resulted in low COD and ammonium removals by direct Biological Treatment. COD and ammonium ion contents of the leachate were reduced to reasonable levels by chemical precipitation with lime and air stripping of ammonia. The pre-treated leachate was subjected to aerobic Biological Treatment in an aeration tank by fed-batch operation. The effects of the feed wastewater COD content and flow rate on COD and ammonium ions removal were investigated. Nearly 76% COD and 23% NH 4 -N removals were obtained after 30 h of operation with a flow rate of 0.21 l h −1 and the feed COD content of 7000 mg COD l −1 . COD removal efficiency decreased with increasing COD loading rates. A kinetic model for COD removal was developed and the kinetic constants were determined by using the experimental data.

  • Simultaneous adsorption and Biological Treatment of pre-treated landfill leachate by fed-batch operation
    Process Biochemistry, 2003
    Co-Authors: Fikret Kargi, M. Yunus Pamukoglu
    Abstract:

    Abstract Due to high chemical oxygen demand (COD), ammonium–N content and presence of toxic compounds such as heavy metals, direct Biological Treatment of landfill leachate results in low removal efficiencies. In order to improve Biological treatability of the leachate, coagulation–flocculation and air stripping of ammonia were used as pre-Treatment. Pre-treated leachate was treated Biologically using an aeration tank operated in fed-batch mode in the absence and presence of powdered activated carbon (PAC) as adsorbent. PAC addition improved COD removal significantly especially at concentrations above 0.5 g l −1 . However, improvements in COD removals were marginal for PAC concentrations above 2 g l −1 . Nearly 86% COD removal was achieved with 2 g l −1 PAC added Biological Treatment whereas, COD removals by only Biological oxidation and only PAC adsorption were nearly 74 and 38%, respectively at the end of 30 h of fed-batch operation. An empirical equation was developed to describe the contribution of adsorption over Biological Treatment as a function of PAC concentration.

  • Enhanced Biological Treatment of saline wastewater by using halophilic bacteria
    Biotechnology Letters, 2002
    Co-Authors: Fikret Kargi
    Abstract:

    Biological Treatment of saline wastewater by conventional activated sludge culture usually results in low removal of chemical oxygen demand (COD) because of plasmolysis of the organisms at high salt concentrations. Since salt removal operations by physicochemical processes before Biological Treatment are costly, a salt-tolerant organism (Halobacter halobium) was used for effective Biological Treatment of saline wastewater in this study. Halobacter halobium was used in activated sludge culture for COD removal from saline wastewater (1–5% salt) by fed-batch operation of an aeration tank. Inclusion of Halobacter halobium into activated sludge culture improved the rate and extent of COD removals especially with salt above 2% (w/v).

  • Use of halophilic bacteria in Biological Treatment of saline wastewater by fed-batch operation
    Water Environment Research, 2000
    Co-Authors: Fikret Kargi, A. R. Dinçer
    Abstract:

    Biological Treatment of saline wastewater by standard activated-sludge cultures typically results in low chemical oxygen demand (COD) removal efficiencies as a result of plasmolysis of cells caused by high salt content (>1%). Removal of salt from wastewater before Biological Treatment by reverse osmosis or ion exchange would be quite costly. However, inclusion of salt-tolerant organisms in an activated-sludge culture to improve Treatment efficiency is a practical approach developed and presented in this article. Synthetic wastewater composed of diluted molasses, urea, phosphate, and different amounts of salt (0 to 5% sodium chloride) was treated in an aeration tank operated in fed-batch mode. Halobacter halobium added to activated-sludge culture was used in Biological Treatment, and results were compared with those obtained with the activated-sludge culture alone. Halobacter addition produced significantly greater COD removal rates and efficiencies (% removal) at salt concentrations greater than 2% salt. At low salt concentrations, performances of both cultures were comparable. Results indicated that saline wastewater containing more than 2% salt can be treated effectively by Halobacter-supplemented, activated-sludge cultures, with COD removal efficiencies greater than 85% within 9 hours of fed-batch operation.

T Viraraghavan - One of the best experts on this subject based on the ideXlab platform.

  • Biological Treatment processes for fish processing wastewater - A review
    Bioresource Technology, 2010
    Co-Authors: Pankaj Chowdhury, T Viraraghavan, A Srinivasan
    Abstract:

    Water consumption in a fish-processing industry and high-strength wastewater from such an industry are of great concern world-wide. Liquid effluent regulations are becoming more stringent day by day. Biological Treatment is the best option for such a wastewater. Anaerobic processes such as upflow anaerobic sludge blanket (UASB) reactor, anaerobic filter (AF) and anaerobic fluidized bed (AFB) reactor can achieve high (80-90%) organics removal and produce biogas. Aerobic processes such as activated sludge, rotating Biological contactor, trickling filter and lagoons are also suitable for organics removal. Anaerobic digestion followed by an aerobic process is an optimal process option for fish processing wastewater Treatment. © 2009 Elsevier Ltd. All rights reserved.

  • Biological Treatment processes for fish processing wastewater a review
    Bioresource Technology, 2010
    Co-Authors: Pankaj Chowdhury, T Viraraghavan, A Srinivasan
    Abstract:

    Water consumption in a fish-processing industry and high-strength wastewater from such an industry are of great concern world-wide. Liquid effluent regulations are becoming more stringent day by day. Biological Treatment is the best option for such a wastewater. Anaerobic processes such as upflow anaerobic sludge blanket (UASB) reactor, anaerobic filter (AF) and anaerobic fluidized bed (AFB) reactor can achieve high (80-90%) organics removal and produce biogas. Aerobic processes such as activated sludge, rotating Biological contactor, trickling filter and lagoons are also suitable for organics removal. Anaerobic digestion followed by an aerobic process is an optimal process option for fish processing wastewater Treatment.

Benjamin Horemans - One of the best experts on this subject based on the ideXlab platform.

  • is Biological Treatment a viable alternative for micropollutant removal in drinking water Treatment processes
    Water Research, 2013
    Co-Authors: Jessica Benner, Damian E Helbling, Hanspeter E Kohler, Janneke Wittebol, Elena Kaiser, Carsten Prasse, Thomas A Ternes, Christian Nyrop Albers, Jens Aamand, Benjamin Horemans
    Abstract:

    In western societies, clean and safe drinking water is often taken for granted, but there are threats to drinking water resources that should not be underestimated. Contamination of drinking water sources by anthropogenic chemicals is one threat that is particularly widespread in industrialized nations. Recently, a significant amount of attention has been given to the occurrence of micropollutants in the urban water cycle. Micropollutants are bioactive and/or persistent chemicals originating from diverse sources that are frequently detected in water resources in the pg/L to μg/L range. The aim of this review is to critically evaluate the viability of Biological Treatment processes as a means to remove micropollutants from drinking water resources. We first place the micropollutant problem in context by providing a comprehensive summary of the reported occurrence of micropollutants in raw water used directly for drinking water production and in finished drinking water. We then present a critical discussion on conventional and advanced drinking water Treatment processes and their contribution to micropollutant removal. Finally, we propose Biological Treatment and bioaugmentation as a potential targeted, cost-effective, and sustainable alternative to existing processes while critically examining the technical limitations and scientific challenges that need to be addressed prior to implementation. This review will serve as a valuable source of data and literature for water utilities, water researchers, policy makers, and environmental consultants. Meanwhile this review will open the door to meaningful discussion on the feasibility and application of Biological Treatment and bioaugmentation in drinking water Treatment processes to protect the public from exposure to micropollutants.