water conditioning Articles

  • Organophosphate Pesticide Degradation Under Drinking Water Treatment Conditions

    Chlorpyrifos (CP) was used as a model compound to develop experimental methods and prototype modeling tools to forecast the fate of organophosphate (OP) pesticides under drinking water treatment conditions. CP was found to rapidly oxidize to chlorpyrifos oxon (CPO) in the presence of free chlorine. The primary oxidant is hypochlorous acid (HOCl); thus, oxidation is more rapid at lower pH (i.e., ...

  • Managing Great Lakes Water Levels Adaptively in Response to Changing Climate Conditions

    The Laurentian Great Lakes contain an abundance of fresh water, collectively representing approximately 20% of the fresh surface water available globally. Despite the enormity of this resource, water levels and flows in the Great Lakes are subject to fluctuations caused by changing climate conditions that have cascading impacts on the coastal ecosystem and the regional economy. Proactive ...


    By LimnoTech Inc.

  • Abutment scour in clear-water and live-bed conditions by GMDH network

    In the present study, the Group Method of Data Handling (GMDH) network has been utilized to predict abutments scour depth for both clear-water and live-bed conditions. The GMDH network was developed using a Back Propagation algorithm (BP). Input parameters that were considered as effective variables on abutment scour depth included properties of sediment size, geometry of bridge abutments, and ...


    By IWA Publishing

  • Reorganization of water demand under changing conditions with possibilistic programming

    To adapt water resources management to changing conditions, the amount of water allocated to the different demands may be redistributed to satisfy water availability constraints. To achieve this, an interactive possibilistic programming procedure is proposed. The main criterion for the reorganization of water allocation to irrigation demands is net water productivity. To cope with uncertainty in ...


    By IWA Publishing

  • "Non-Chemical Water Conditioning at Schick: A Pollution Prevention Case Study"

    Untitled Document Overview Since 1994, the Schick company of Milford has ...


    By Dolphin WaterCare

  • Diatoms for assessing the ecological condition of inland freshwater bodies

    The ecological responses of diatoms to pollution and nutrient enrichment, caused by domestic and municipal sewage, in the five fresh water ponds have been examined. It was observed that diatoms were completely absent in P3 and some species were also absent in P1 and P2. Similarly, diatom diversity was lower in P1 and P2 than in P4 and P5. However, diatom abundance was higher in P4. The Biological ...


    By Inderscience Publishers

  • Tech Tip: SeaFET/SeapHOx pH Pre-conditioning

    The SeaFET/SeapHOx must condition to the deployment environment for at least 48 hours before pH data is considered reliable. The Shallow SeaFET’s external pH sensor must be powered and exposed to the deployment site’s water for 2–5 days before obtaining quality data. You will often see the external pH gradually rise until it meets the internal reference pH within ~0.05 pH after ...

  • Asset Management Condition Assessment for Stockton: To Test or Not To Test

    ABSTRACTTo help ensure assets are maintained to high standards, a 20-year service contact between the City of Stockton and OMI/Thames Water required a condition assessment of all managed assets. Due to the size and complexity of the system, it was not possible to test all assets as part of the condition assessment. A methodology was developed to prioritize assets to be subjected to further ...

  • Innovative approach to unforeseen site conditions – case study

    The Crater Resources Quarry 3 Remediation site was a former limestone quarry that was later used as a disposal site for Waste Ammonia Liquor (WAL) generated by the coke making facility at a steel mill. The WAL contained water, ammonia, and small amounts of various hydrocarbons formed during the coking process. Coking operations shut down by the mid 1980's and discharge into the quarry ceased. The ...

  • CProb: a computational tool for conducting conditional probability analysis

    Conditional probability is the probability of observing one event given that another event has occurred. In an environmental context, conditional probability helps to assess the association between an environmental contaminant (i.e., the stressor) and the ecological condition of a resource (i.e., the response). These analyses, when combined with controlled experiments and other methodologies, ...

  • Condition assessment program continues in North Queensland

    Justification of an ongoing condition assessment program can, at times, be difficult for water utilities. However, successful inspections that deliver actionable outcomes on how to manage aging assets make this justification much easier. Certainly that was the case for Mackay Regional Council (MRC) when it engaged the services of ...

  • AVA – The expert for ash and dust conditioning - case study

    For an environment free of dust Application Ashes and dust from the filters of incineration, de-dusting and drying plants are lyed, moistened or solidified. The result is a disposable final product, a transportable property or re-usable value products e.g.: Dust from power plants for the use in road construction and building material industry ...


    By AVA GmbH u. Co. KG

  • Incorporating Condition Assessment into a Comprehensive Asset Management Program

    ABSTRACTIn order to improve asset investment decision-making and achieve sustainable improvements in business performance, utilities must better understand asset condition, asset performance, remaining life and risks. Worldwide, annual expenditure on the maintenance and rehabilitation of water/wastewater reticulation pipes is estimated to be over $33 billion per year, and this is expected to rise ...

  • 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

  • Characterization of the hydraulic performance of a gully under drainage conditions

    During rainfall events with low return periods (1–20 years) the drainage system can provide some degree of protection to urban areas. The system design is based not only on good hydraulic performance of the surface and the sewer network but also on their linking elements. Although the linking elements are of utmost importance as they allow the exchange of flow between the surface and the ...


    By IWA Publishing

  • How Climate Change will affect your Work Conditions

    After the major discussions regarding Climate Change this month in Paris, 5 key points of the Paris Agreement on climate change are being presented: Limiting global temperature rise to “well below” 2 C Creation of the first universal climate agreement Providing help to poorer nations Each country ...


    By SafetySmart

  • Landfill site improvement condition for PPC permit

    The installation is a landfill site licensed for the disposal of inert waste. It lies in a potentially sensitive location on the flood plain of the River Great Ouse, near Milton Keynes and it is therefore important to the client to ensure good environmental monitoring is undertaken. The site is divided into two sections, (the north western area and the south eastern area) by the River Great Ouse, ...


    By ESI Consulting Ltd

  • Effects of Operational Conditions on the Performance of Triethylamine Biofiltration

    ABSTRACT Nitrogen compounds such as triethylamine are odorants generally found in chemical plants and foundries in which cold-box cores are made. In this study, the efficiency of biofiltration of triethylamine (TEA) vapor was evaluated. Experiments were conducted in two 6-L biofilters arranged in three stages and packed with inoculated compost - wood chips (40:60v/v) as the filter medium. The ...

  • Impact of weather conditions on pipe failure: a statistical analysis

    The occurrence of pipe failures in drinking water distribution networks may be influenced by weather conditions. In this work, a statistical analysis is performed to study the correlations between weather parameters and pipe failure in the Netherlands with the ultimate aim to predict the effects of climate change on network integrity. Failure data from a Dutch national failure database were ...


    By IWA Publishing

  • Delivering an Enhanced Sewer Condition Prioritization Process

    SCREAM™ is a sewer and manhole condition assessment tool developed by CH2MHill. It has been built into Wallingford Software’s InfoNet asset management solution as one of the standard choices for sewer and manhole condition grading. There is emphasis across the collections systems industry worldwide for sewer condition prioritization methods and manhole condition ranking. Although currently the UK ...


    By Innovyze

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