sewer heat Articles

  • Modelling the viability of heat recovery from combined sewers

    Modelling of wastewater temperatures along a sewer pipe using energy balance equations and assuming steady-state conditions was achieved. Modelling error was calculated, by comparing the predicted temperature drop to measured ones in three combined sewers, and was found to have an overall root mean squared error of 0.37 K. Downstream measured wastewater temperature was plotted against modelled ...


    By IWA Publishing

  • Feasibility study of Using GVRD sewers as heat sources and sinks

    Executive Summary As pari of the Sustainable Region Initiative (SRI) the Greater Vancouver Regional District (GRVD) Policy and Planning Department has commissioned this study to investigate the use of district sewers as heat sources or heat sinks. This conceptual study examines the technology available for sewer heat transfer, and provides a mathematical and physical model of a heat transfer ...


    By RABTHERM AG

  • Research of trace metals as markers of entry pathways in combined sewers

    Combined sewers receive high toxic trace metal loads emitted by various sources, such as traffic, industry, urban heating and building materials. During heavy rain events, Combined Sewer Overflows (CSO) can occur and, if so, are discharged directly into the aquatic system and therefore could have an acute impact on receiving waters. In this study, the concentrations of 18 metals have been ...


    By IWA Publishing

  • Monitoring Leaks from Heat Exchanger - Paper Plant

    The Situation A Paper plant in the Eastern US uses 500 GPM filtered pond water for cooling lubricating oil in their paper line.  The now warmer water is sewer to an on-site pond.  Because the water is used to cool lubricating oil, the plant could not reuse the water in their pulping process for fears of possible oil contamination of the paper pulp.  The plant needed to be ...

  • First State-funded cleanup using electrical resistivity heating technology

    The Remediation and Redevelopment Division (RRD) completed remediation at a former dry cleaning facility in the city of Owosso using electrical resistivity heating (ERH) technology. Electrical resistivity heating is an in­situ electrical heating technology that uses electricity and applies it into the ground through electrodes. The resistance of the electricity traveling through the ground ...


    By TRS Group, Inc.

  • Future-oriented further developments: wastewater heat utilization plants with a return on investment (ROI) of 2 - 6 years

    Sewage is dirty and stinks. Out of sniffing distance – out of mind. Up until the 1980s sewage was taboo and not given the attention it deserves. One cold winter morning in 1988, 23 years ago, Urs Studer stopped beside a steaming manhole cover and wondered how such a source of heat could go untapped. Ever since he has been dedicating himself intensively to the recycling of sewage heat. At ...


    By RABTHERM AG

  • Closing the last Energy Leak

    The heat contained in wastewater is one of the last major untapped resources in the field of renewable energies, despite the fact that it may some day provide some 20% of the heating energy we need. This huge potential has been addressed by a Swiss engineering office, Rabtherm AG, which now supplies patented technology for generating energy from wastewater, used for heating or cooling buildings. ...


    By RABTHERM AG

  • Car Washing Efficiently: Carlovers Carwash Limited

     Background Since 1988, CarLovers Carwash Limited has operated a network of automatic and self-serve carwash facilities throughout Australia. CarLovers currently has 87 carwash outlets operating in Australia. Pre-existing Process Previous car wash facilities discharged all their wash water to sewer and did not reuse the wash water. ...


  • How to Save with Cooling Tower Credits

    Cooling towers dissipate heat from recirculating water used to cool chillers, air conditioners, or other process equipment to the ambient air. Heat is rejected to the environment from cooling towers through the process of evaporation. Therefore, by design, cooling towers use significant amounts of water. The thermal efficiency and longevity of the cooling tower and equipment depend on the proper ...


    By WaterSignal

  • Adaptation tipping points and opportunities for urban flood risk management

    The effects of climate change are expected to increase the frequency and magnitude of floods, droughts and heat waves. An emerging method termed adaptation tipping point – opportunity (ATP-O) assesses a system's climate-incurred tipping points and uses opportunities arising from urban developments to introduce adaptation strategies while reducing investment costs. The objective of this ...


    By IWA Publishing

  • Marley does it all

    Marley Plumbing & Drainage has supplied its Quantum PVCu sewer system, Deepflow high capacity gutter system and Equator plumbing fittings to the Creemills housing development, on the banks of the River Cree. The exceptional durability and ease of installation offered across all three product ranges was instrumental to their specification, with the convenience of being able to source all ...


    By Water Active Ltd

  • Tunneling Under Austin, Protecting the Environment, and Preserving the Peace

    ABSTRACTFor over a decade, an existing 42-inch wastewater interceptor has plagued the Austin Water Utility (Utility) with higher than usual maintenance demands. Located in the Walnut Creek flow line, this interceptor is partially exposed with manholes rising several feet above the creek bed due to years of erosion. The interceptor suffers from external erosion and is victim to debris floating ...

  • Hydrocarbon in Water Monitors using Fluorescence

    Hydrocarbon in Water Monitors using Fluorescence are capable of detecting hydrocarbons as low as 5 Parts per Billion and as high as 10,000 Parts per Million depending on the application.  Because only the target hydrocarbons will fluoresce, these monitors have no significant affect due to water turbidity (rust, dirt, gas bubbles, soot, etc.).  Fluorescence monitors provide a measurement ...

  • Detergent and Fabric softener producer - case study

    Application A detergent and fabric softener producer in the Central United States had numerous waste-water disposal issues resulting from the bottling of fabric softeners and detergents. Wastewater Description The wastewater contained diluted fabric softener, anionic detergents and wash-down waters from bottling change-overs. The waste stream also contained ...


  • Evaporator Limits Boron to 5 PPM at award-winning chemical plant

    Problem: The biggest challenge confronting Rohm & Haas Corp. in building a wastewater plant for its chemical facility in Elma, Wash., was meeting Washington State Dept. of Ecology limitations on boron of 5 ppm. The Elma plant manufactures sodium borohydride, a versatile chemical used in a variety of applications ranging from the generation of sodium hydrosulfite for reductive bleaching of ...


    By Oil Skimmers, Inc.

  • Going Green in D.C. Case Study

    Green infrastructure practices serve as decentralized alternatives to traditional wet weather controls in urban areas where land is limited and sewer infrastructure is often stressed to capacity. Green infrastructure attempts to restore natural hydrologic processes and decreases the quantity of runoff, reduces peak flow rates, and improves water quality. In addition, green infrastructure can ...


    By LimnoTech Inc.

  • Q&A: The world’s eyes turn to Minnesota on district energy

    Frank Jossi reports in Midwest Energy News that for the second time in a little more than a decade St. Paul is hosting an international conference on district energy. Ken Smith is the president and CEO of District Energy St. Paul and past Chair of the International District Energy ...

  • How to tap the energy savings in greywater

    Many operators of offices, hospitals, hotels, large condos, and other buildings are aware of the need to save money and reduce their environmental impact, through better water management. The result has been the growth of ways to reduce water consumption, ranging from low-flow show-crheads to landscaping that requires minimal watering. Building operators are also aware of a similar need to ...


    By DDI Heat Exchangers Inc.

  • Massachusetts Water Resources Authority (MWRA) – Boston and suburbs - Case Study

    The MWRA is a state government agency that provides wholesale water and sewer services to 2.5 million people and more than 5,500 large industrial users. It also monitors outflows in Cape Cod Bay and Boston Harbor using a range of advanced technologies. As an industrial user of electricity, agency officials are looking to reduce economic volatility from electricity costs and to improve energy ...

  • Trade SIA on the Environmental Goods Agreement OZONATOR - Case Study

    An innovative technology has been developed in Canada for the processing of medical and bio-hazardous waste using ozone as the sterilizing agent. Ozone is generated and is produced from ambient air and any residual ozone is converted back to oxygen, resulting in zero emissions. Waste is sterilized at room temperature without heat, steam, chemicals, flames, exhaust, odours with nothing to drain or ...


    By OZONATOR Industries Limited

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