sludge conditioning Articles

  • Conditions for successful composting of industrial Sludges

    The principles of the biological aerobic treatment of industrial sludge, its aims and constraints will first be presented in this paper. The BIOSEC® process, developed by NEXUS Technologies, will than be described in its different phases to approach the technology and the treatment procedure in the best possible way. This presentation would be incomplete without mentioning the costs of the ...


    By ORBIT e.V.

  • Los Angeles County WRRF Embraces Codigestion

    Technology to produce food waste slurry key to project implementation - and helps generators comply with California organics recycling mandates. The Sanitation Districts’ JWPCP in Carson (CA) treats an average of 280 million gallons/day of wastewater. One of the two anaerobic digestion tanks above has been used for codigestion, with the second serving as the control. Photos ...


    By BioCycle Magazine

  • 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

  • Biotreatment of Odors from the Zimpro Sludge Conditioning Process

    Management of odor emissions generated during thermal sludge conditioning is a well known disadvantage of the “Zimpro” process. Traditional methods of using chemical oxidation and high temperature destruction result in the formation of secondary products, such as chlorine gas, organic halocarbons or nitrogen oxides. In this study, biotrickling filter technology was evaluated at the Villa Hills ...


    By PRD Tech, Inc.

  • Advantages of anaerobic digestion of sludge in microaerobic conditions

    The paper reviews results and experience of microaerobic experiments at both high and low sulphide concentrations and evaluates advantages and drawbacks of the anaerobic digestion of sludge in microaerobic conditions as regards biogas quality, digested sludge quality, organic pollutants biodegradability and methanogenic activity of biomass. The innovative microaerobic modification of the ...


    By IWA Publishing

  • Influence of conditioning agents and enzymic hydrolysis on the biochemical methane potential of sewage sludge

    Biochemical methane potential (BMP) tests have been carried out on sewage sludge from two wastewater treatment plants to assess the effect of additives (FeCl3 and two cationic polyelectrolytes) used in sludge dewatering. BMP tests were also carried out on the concentrated solid phase from the enzymic hydrolysis pre-treatment (42 °C, 48 h). FeCl3 had no significant effect on ...


    By IWA Publishing

  • A method for visualising polyelectrolyte distribution after polyelectrolyte conditioning of a biotic sludge

    Charge neutralisation is an important mechanism in (polyelectrolyte) conditioning of biotic sludges and required for efficient sludge dewatering. Based on results from streaming potential and zeta potential measurements, it has been suggested that charge neutralisation is more complete on the outside of the sludge flocs than on the inside. This paper discusses the development of a technique for ...


    By IWA Publishing

  • Chitosan use in chemical conditioning for dewatering municipal-activated sludge

    This work aims to evaluate the potential use of chitosan as an eco-friendly flocculant in chemical conditioning of municipal-activated sludge. Chitosan effectiveness was compared with synthetic cationic polyelectrolyte Sedipur CF802 (Sed CF802) and ferric chloride (FeCl3). In this context, raw sludge samples from Beni-Messous wastewater treatment plant (WWTP) were tested. The classic jar test ...


    By IWA Publishing

  • The effect of operational conditions on the hydrodynamic characteristics of the sludge bed in UASB reactors

    This work aims to evaluate the hydrodynamic properties of the sludge bed of Upflow Anaerobic Sludge Blanket (UASB) reactors based on its settleability and expansion characteristics. The methodologies used for the evaluation of the settleability of aerobic activated sludge, and for the expansibility of a sludge bed of Expanded Granular Sludge Bed reactors and Fluidised Bed Reactors were adapted ...


    By IWA Publishing

  • Optimization of operation conditions for preventing sludge bulking and enhancing the stability of aerobic granular sludge in sequencing batch reactors

    Sludge bulking caused by loss of stability is a major problem in aerobic granular sludge systems. This study investigated the feasibility of preventing sludge bulking and enhancing the stability of aerobic granular sludge in a sequencing batch reactor by optimizing operation conditions. Five operation parameters have been studied with the aim to understand their impact on sludge bulking. ...


    By IWA Publishing

  • The Benefits of Biogas Conditioning

    Abstract Anaerobic digestion is quickly becoming the choice technology for sewage sludge treatment at wastewater treatment plants, as the methane rich biogas produced is a valuable resource which can be used to generate electricity. In the oxygen restricted environment, a natural by-product of the anaerobic process is hydrogen sulfide, a harmful contaminant. Also present in the biogas are ...


    By Biorem Technologies Inc.

  • Transformation of Estrogens in Nitrifying Activated Sludge under Aerobic and Alternating Anoxic/Aerobic Conditions

    Natural and synthetic estrogens are present in municipal wastewater treatment plants effluents. Biodegradation of estrogens, including the natural estrogens estrone (E1) and 17-beta-estradiol (E2), as well as the synthetic 17-alpha-ethinylestradiol (EE2), can occur during sewage treatment, particularly in activated sludge. Investigations of removal of estrogens in wastewater treatment plants, as ...

  • Effect of preparation conditions and washing of activated carbon from paper mill sewage sludge on its adsorptive properties

    Sludge-based activated carbon (SAC) was prepared from paper mill sewage sludge by physical activation with steam for wastewater treatment in this study. The effects of preparation variables, including carbonization temperature, carbonization time, activation temperature and activation time, on iodine number and yield were investigated through orthogonal experiments. The influences of washing by ...


    By IWA Publishing

  • Optimized culture condition for enhancing lytic performance of waste activated sludge by Geobacillus sp. G1

    Hydrolysis is known as the rate-limiting step during waste activated sludge (WAS) digestion. The optimization of the culture conditions of Geobacillus sp. G1 for enhancing WAS hydrolysis was conducted in this study with uniform design and response surface methodology. Taking the lysis rate of Escherichia coli as the response, the Plackett–Burman design was used to ...


    By IWA Publishing

  • Municipal sludge characteristic changes under different aerating condition in a deep-shaft aeration system

    A pilot-scale municipal sewage sludge deep-shaft aeration system was implemented in Lanzhou, Gansu Province of China. The reactor depth was 60 m with a diameter of 1.0 m and the sludge to be treated came from a wastewater plant in Lanzhou. In order to obtain the optimum operation conditions, analysis was conducted on the transformations of the volatile suspended solids (VSS), temperature, pH, ...


    By IWA Publishing

  • Phosphorus release mechanisms during digestion of EBPR sludge under anaerobic, anoxic and aerobic conditions

    Three laboratory-scale digesters were operated in parallel under anaerobic, anoxic and aerobic conditions to reveal the release mechanisms of phosphorus when digesting enhanced biological phosphorus removal (EBPR) sludge. The variation rates of the parameters associated with phosphorus release were calculated and compared with that of a typical EBPR anaerobic process. The results show that both ...


    By IWA Publishing

  • Performance of aerobic granular sludge at variable circulation rate in anaerobic–aerobic conditions

    Aerobic granular sludge (AGS) has been applied to treat a broad range of industrial and municipal wastewater. AGS can be developed in a sequencing batch reactor (SBR) with alternating anaerobic–aerobic conditions. To provide anaerobic conditions, the mixed liquor is allowed to circulate in the reactor without air supply. The circulation flow rate of mixed liquor in anaerobic condition is ...


    By IWA Publishing

  • New processes for the improvement of sludge digestion and sludge dewatering

    INTRODUCTIONThe examination of numerous sewage sludges from municipal wastewater treatment plants leads to the conclusion that on the one hand dewaterability of these sludges worsens and that on the other hand dewaterability of sludges becomes more and more important due to increasing disposal costs. Especially wastewater treatment plants with inflows from the food processing industry often face ...


    By Cambi AS

  • Denitrification and Floating Sludge

    What is Denitrification? Denitrification is the conversion of soluble nitrate to nitrogen gas in the nitrogen cycle. For denitrification to occur, three factors are needed: Presence of Nitrate Anoxic conditions (no free dissolved oxygen) A carbon source (soluble BOD) Floating Sludge Denitrification is useful and ...

  • Shining a light on sludge

    HACH LANGE's Solitax turbidity/ suspended solids sensor has been integrated into a tanker reception system to enable the measurement of solids concentration in wastewater movements to and from treatment plants and in trade waste applications for monitoring strengths of imported wastes. JR Pridham Services Ltd (JRP) developed the system to provide visibility of both quantitative and qualitative ...


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