sedimentation tank sludge Articles

  • Common Treatment Technologies for Inorganics in Soil, Sediment, and Sludge

    The most commonly used treatment technologies for inorganics in soil, sediment, and sludge include solidification/stabilization (S/S), excavation and off-site disposal, and acid extraction. These treatment technologies are described briefly below. Solidification processes produce monolithic blocks of waste with high structural integrity. The contaminants do not necessarily interact chemically ...

  • In Situ Biological Treatment for Soil, Sediment, and Sludge

    The main advantage of in situ treatment is that it allows soil to be treated without being excavated and transported, resulting in potentially significant cost savings. However, in situ treatment generally requires longer time periods, and there is less certainty about the uniformity of treatment because of the variability in soil and aquifer characteristics and because the efficacy of the ...

  • Seven Ways Your Facility Isn’t Meeting Effluent Regulations and How to Solve Them

    Whether you own, operate, or help manage a municipal or industrial facility that deals with wastewater, it’s important to understand how wastewater treatment can play a significant role in the overall health of your business, especially when it comes to meeting effluent regulations. This is an important part of the wastewater treatment process to consider, as ignoring it could earn your ...


    By SAMCO Technologies, Inc.

  • Development of Final Sedimentation Tank Maximum Operating Capacity Curves Using Vesilind Settling Parameters and Mathematical Modeling

    New advances in development of maximum operating capacity curves using final sedimentation tank (FST) computational fluid dynamic (CFD) package – High Accuracy Clarifier Model (HACM©) and Vesilind settling parameters (Vo and k) were successfully applied in a recent project at the Sai Kung Sewage Treatment Works of the Drainage Services Department (DSD) in Hong Kong. The advances consist of more ...

  • Controlling Sludge in Lamella Clarifiers

    This month we are focusing on the control of sludge blanket build up in Lamella Clarifiers. Lamella Clarifiers, also known as Inclined Plate Separators (IPS) are in common use at Waste Water Treatment Sites as small footprint plant settlement units and are often employed in ...


    By Partech (Electronics) Ltd.

  • Two models for tank cleaning

    Fluid treatment specialist Algae- X International, Fort Myers, Fla., has expanded its Mobile Tank Cleaning (MTC) series with two new models. The MTC 500-AFR is an adjustable flow rate system for use with a wide range of tank sizes and fluid types such as diesel, biodiesel and hydraulic fluid. The MTC 1000-LX is the next generation of Algae-X’s MTC 1000 unit, now with stainlesssteel plumbing and ...


    By AXI International

  • New sludge blanket level analyzer from Entech

    Entech Design, Inc.’s BinMinder 9300 features a multi-channel analyzer designed for superior sludge level detection in the full range of water and wastewater applications. The system consists of an analyzer that is capable of operating from one to four sensors or transducers for reliable and cost-effective measurement. Measurements are made by transmitting a high frequency sound wave and ...


    By Entech Design, Inc.

  • Retainment of the antimicrobial agent triclosan in a septic tank

    Laboratory experiments were conducted to investigate the fate of the antimicrobial agent triclosan (TCS) in a conventional septic tank. The main mechanism of TCS removal from wastewater was identified to be rapid TCS sorption to suspended particles followed by settling of these particles to the bottom of the septic tank. Sorption to particles was completed within minutes while the settling took ...


    By IWA Publishing

  • A consistent modelling methodology for secondary settling tanks: a reliable numerical method

    The consistent modelling methodology for secondary settling tanks (SSTs) leads to a partial differential equation (PDE) of nonlinear convection–diffusion type as a one-dimensional model for the solids concentration as a function of depth and time. This PDE includes a flux that depends discontinuously on spatial position modelling hindered settling and bulk flows, a singular source term ...


    By IWA Publishing

  • Enhancement of phosphorus removal in a low temperature A2/O process by anaerobic phosphorus release of activated sludge

    An anaerobic phosphorus release tank was introduced to an anaerobic–anoxic–aerobic (A2/O) process treating domestic sewage to enhance the phosphorus removal at low temperature. Phosphorus release of the activated sludge from the second sedimentation tank was evaluated at 14 °C by batch cultures, and the nutrient removal in the modified low temperature A2/O process ...


    By IWA Publishing

  • Freezing/thawing effect on sewage sludge degradation and electricity generation in microbial fuel cell

    The effect of sludge freezing/thawing on its disintegration and subsequent use as substrate in a microbial fuel cell (MFC) was investigated to enhance organic matter degradation and electricity generation. Experimental results indicated that long freezing time (more than 48 h) was effective in disintegrating the sludge collected from the secondary sedimentation tank of a wastewater treatment ...


    By IWA Publishing

  • Full scale experience of retrofitting thermal hydrolysis to an existing anerobic digester for the digestion of waste activated sludge

    ABSTRACT Naestved central WWTP is a 5 MGD facility that was originally designed as a Bio DeNiPho plant following primary sedimentation. In 1998 the primary tank was bypassed in order to reduce organic micro-pollutants by aerobic treatment in the aeration basins. This reduced the micro-pollutants but led to a bulky undigestible sludge and foaming due to Microthrix. The Microthrix problem was ...


    By Cambi AS

  • Changing from manual to automated tank cleaning saved time and money case study

    At ESSO’s Fawley Refinery in the UK, the cat slurry tanks were in need of cleaning. Two main objectives were outlined for the project: Minimum downtime and minimum waste generation. The BLABO automated system proved its strength on both accounts. Over time, the Fawley Refinery cat-fines sludge tanks had built up calalytic fines strata and consolidated sediments at the bottom. A thorough ...


    By Oreco A/S

  • Mixers and Flowmakers: Flowmakers at the Rugby WWTP, UK

    We have installed 8 flowmakers, type POPL-I, in the aeration tank at the municipal wastewater treatment plant in Rugby Newbold. The flowmakers create the specified velocity in the tanks which are equipped with bottom aeration. At the same time the sludge is homogenized and sedimentation is prevented. The units have operated continuously since 1999. Landia supplied mixers to the sludge tanks in ...


    By Landia

  • Mixers and Flowmakers: Flowmakers at the Voreppe WWTP, France

    We have installed 8 flowmakers, type POPL-I, in aeration tanks with bottom aeration – each tank is 9,000 m³. The flowmakers create the specified average velocity of 0.3 m/sec. The sludge is homogenized and sedimentation is prevented. The plant has been in operation since 1994. The units have a total operating time of more than 80,000 ...


    By Landia

  • ISKI WTP, portable water treatment plant, Turkey

    The largest potable water treatment plant in Turkey uses DEWA Chain & Flight type Sludge Collectors to remove settled sludge. So far, DEWA has provided 72 systems of Chain and Flight Sludge Collectors for two of their plants. DEWACO delivered a complete sludge removal system comprising of: A triple deck sedimentation tank design. The dimensions of each deck are as ...


    By Dewaco Ltd

  • Case study – Gem-D series

    Introduction Clean Water Technology, Inc., the creator of the Gas Energy Mixing (GEM) System, introduces their newest in technology The GEM - D Series for municipal water and wastewater applications. The GEM-D Series is a hybrid dissolved air – flotation system. What makes the GEM-D Series better than the rest? Introduction of air through Liquid Solid Gas ...


    By Clean Water Technology, Inc.

  • Case Study - The performance of the grease degrading bioproduct greasolux in the meat manufacturing factory and municipal WWTP

    Problem A municipal waste water treatment plant in one Baltic town continuously had problems with the fat, oil and grease (FOG) accumulation in the sewer lines, lift stations and waste water treatment plant, since the start up of a local meat processing facility. The highly polluted waste water directly impacted the treatment plant in the following ways: Increased grease ...


    By Ecochemicals UAB

  • Mass balance analysis of triclosan, diethyltoluamide, crotamiton and carbamazepine in sewage treatment plants

    The behavior of antibacterial triclosan, insect-repellent diethyltoluamide (DEET), anticonvulsant carbamazepine, and antipruritic crotamiton was investigated at two sewage treatment plants (STPs) to clarify their complete mass balance. Twenty-four-hour flow-proportional composite samples were collected from the influent and effluent of primary and final sedimentation tanks, a biofiltration tank ...


    By IWA Publishing

  • Case Study - The performance of the grease degrading bioproduct greasolux in the wastewater treatment plant of the resort town

    Problem One of the Lithuanian resort towns, during the warm period of year, continuously had problems with the fat, oil and grease (FOG) accumulation in the sewer lines and wastewater treatment plant. The highly polluted wastewater directly impacted the treatment plant in the following ways: Increased grease accumulation in sewer lines and lift: stations; Poor ...


    By Ecochemicals UAB

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