aerobic sludge digestion Articles

  • Examples of energy self-sufficient municipal nutrient removal plants

    In Austria, two municipal WWTPs (the Strass TP and Wolfgangsee-Ischl TP) operated with nutrient removal and aerobic sludge digestion are now energy self-sufficient. This is the result of a long-standing and on-going optimisation process at both plants including optimal aeration control and control of the aerobic section of the aeration tank to optimise denitrification and prevent degradation of ...


    By IWA Publishing

  • Effect of low power ultrasound on aerobic/anoxic digestion of activated sludge

    The effect of low power ultrasound on aerobic/anoxic digestion of activated sludge was investigated. First, dehydrogenate activity (DHA) and special oxygen uptake rate (SOUR) were detected to indicate the change of biological activity of sludge induced by ultrasound. Single-factor experiments showed that when the ultrasonic frequency was 28 kHz, the optimal ultrasonic density and exposure time ...


    By IWA Publishing

  • Ozonation of endogenous residue and active biomass from a synthetic activated sludge

    Coupling the activated sludge and the ozonation processes is an efficient, although expensive, solution for sludge reduction. A better knowledge of the mechanisms involved in the degradation of various sludge fractions by ozone is needed to optimize the coupled process. The objectives of this study were to determine the biodegradability of ozone-solubilized endogenous residue, the action of ozone ...


    By IWA Publishing

  • Aerobic biological treatment of thermophilically digested sludge

    Aerobic biological treatment of digested sludge was studied in a continuously operated laboratory set-up. An aerated reactor was filled with thermophilically digested sludge from the Moscow wastewater treatment plant and inoculated with special activated sludge. It was then operated at the chemostat mode at different flow rates. Processes of nitrification and denitrification, as well as ...


    By IWA Publishing

  • Influence of nanoparticles on the polymer-conditioned dewatering of wastewater sludges

    The effect of using small-scale, high surface area, nanoparticles to supplement polymer-conditioned wastewater sludge dewatering was investigated. Aerobically digested sludge and waste activated sludge sourced from the Hunter Valley, NSW, Australia, were tested with titanium dioxide nanoparticles. The sludge samples were dosed with the nanoparticles in an attempt to adsorb a component of the ...


    By IWA Publishing

  • Preliminary evaluation of biosolids characteristics for anaerobic membrane reactors treating municipal wastewaters

    This study assessed the characteristics of biosolids of a pilot-scale anaerobic membrane bioreactor (AnMBR) treating municipal wastewater. The production of total solids (TS) and volatile solids (VS) was comparable to that reported for the extended aeration system at solids residence time (SRT) longer than 40 days. The yields of TS and VS were reduced as SRT increased from 40 to 100 days and ...


    By IWA Publishing

  • Pre-Treatment of Sludges Before Aerobic Digestion to Enhance Sludge Quality

    ABSTRACTBench scale experimentation was completed to assess the potential of using a short residence time pre-treatment reactor upstream of aerobic digestion to enhance the destruction of pathogens. The impact of aeration, temperature, hydraulic residence time, solids concentration, feeding frequency and mechanical shearing on the pre-treatment process was investigated. Subsequent testing ...

  • Wastewater Treatment for a soft drink processing company

    Description of the plant The wastewater from production and filling of mineral waters and soft drinks is pre-treated mechanically by a screen and buffered in an aerated mixing and balancing reactor. After equalization of flow and load the wastewater is given to the biological reactors where organic substances as sugar and other organic compounds are decreased by biological activity of ...

  • Preparation and Performance of Inorganic Coagulant for Landfill Leachate Pretreatment

    Landfill leachates are often defined as hazardous and heavy polluted wastewaters. It may contain large amount of organic matter, ammonia-nitrogen, heavy metals, chlorinated organics and inorganic salts (Wang et al. 2002). Proper treatment of leachate has therefore been a challenging problem confroting the local authorities. Anaerobic digestion or/and aerobic activated sludge methods are the most ...


    By Springer-Verlag GmbH

  • Aerators Enhance Aerobic Digestion Process

    The city of Eden,N.C.,operates an extended aeration process designed for an average flow rate of 13.5 mgd with a mixed liquor suspended solids concentration that typically checks in about 6,000 mg/l. This high biomass concentration is necessary to provide a well-settling sludge and good effluent quality. Further, the plant influent is approximately 40% domestic wastewater and 60% industrial ...


    By S&N Airoflo Inc.

  • The source for floating WWT equipment brush rotors - mixers - polishing RBCs - Case Histories

    Products have been utilized in all types of wastewater applications including Activated Sludge Basins, Oxidation Ditches, Aerobic Digesters, EQ Basins, as well as Lagoons. Products can be used in anyaerated basin or lagoon that needs aeration, no matter the size or shape. These are not just surfaceunits -Mixing Depth & Homogeneous Mixing are not issues. Upgrade of 200 HP Orbal Oxidation ...


    By S&N Airoflo Inc.

  • Effect of Secondary Aerobic Digestion on Properties of Anaerobic Digested Biosolids

    ABSTRACTIn this study, the performance of sequential anaerobic-aerobic digestion was compared to conventional anaerobic digestion for sludge from the Blue Plains Advanced Wastewater Treatment Plant. Volatile solids removal, polymer conditioning demand for dewatering, and biosolids odor characteristics following anaerobic digestion and sequential anaerobic-aerobic digestion were monitored. Aerobic ...

  • Recovering Carbon Source from the Thermophilic Aerobic Digested Sludge for Biological Nutrient Removal

    Available carbon source is essential to enhance the biological nutrient removal (BNR) in wastewater treatment. Volatile fatty acids (VFAs) accumulated in the thermophilic aerobic digestion (TAD) supernatant under the microaerated operation is the potential carbon source for denitrification and phosphorus removal. This study investigated the use of VFAs recovered from the TAD supernatant in the ...

  • CH#826 - Municipal Oxidation Ditch

    BackgroundThe treatment plant at this Midwestern City is a well operated facility treating approximately 1.1 mgd municipal waste from the surrounding community. Over the past several years the publicly owned treatment works has consistently been able to produce an excellent quality effluent with respect to BOD, suspended solids, ammonia and phosphate. To achieve this level of treatment, the ...

  • Consumer beverage waste water pre-treatment plant - Case study

    Application Consumer Beverage Waste Water Pre-Treatment Plant Material Aerobic Digested Sludge .5% -.75% Solids Problems & Challenges Very Difficult Sludge to Dewater due to Low Bulk Solids and Process Issues Existing 1.5 Meter Press Single Belt Unit Process Rate ...


    By Sebright Products, Inc.

  • MCCSD Case Study

    As representatives of a small community, the Mendocino City Community Services District administrators felt strongly that they needed to deliver terrific wastewater treatment value at the lowest cost for their taxpayers.  But they knew they needed to make a change, as their existing wastewater treatment system left unwanted solid accumulations at numerous points ...


    By Aqualitec Corp.

  • Membrane thickening aerobic digestion processes

    Sludge management accounts for approximately 60% of the total wastewater treatment plant expenditure and laws for sludge disposal are becoming increasingly stringent, therefore much consideration is required when designing a solids handling process. A membrane thickening aerobic digestion process integrates a controlled aerobic digestion process with pre-thickening waste activated sludge ...


    By IWA Publishing

  • Impact of copper and cadmium on aerobic and anaerobic digestibility of sonicated sludge

    The effects of the introduction of a sludge reduction process such as ultrasound on batch aerobic and anaerobic biodegradability after exposition to two metals (copper and cadmium) were investigated. The specific energy of ultrasonic treatment applied to the sludge was 200,000 kJ kg TS-1. Ultrasonic treatment led to floc size reduction and to organic matter solubilization. Low copper ( ...


    By IWA Publishing

  • Sludge digestion instead of aerobic stabilisation – a cost benefit analysis based on experiences in Germany

    As a consequence of a worldwide increase of energy costs, the efficient use of sewage sludge as a renewable energy resource must be considered, even for smaller wastewater treatment plants (WWTPs) with design capacities between 10,000 and 50,000 population equivalent (PE). To find the lower limit for an economical conversion of an aerobic stabilisation plant into an anaerobic stabilisation ...


    By IWA Publishing

  • Molecular Chemical Grinder Improves Digestion in Sludge

    Municipal wastewater treatment plants (WWTPs) can reduce the costs and liabilities of sludge handling and disposal and increase their organic solids conversion rate with the Advanced Fluidized Composting (AFC) Process or the Advanced Fluidized Co-Digeson & Co-Generaon (AFC2) Process from BioConversion Soluons, LLC (BCS). The conventional sludge treatment techniques of aerobic and anaerobic ...

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