Search results for "Water softening"

showing 3 items of 3 documents

Donnan dialysis for tap-water softening

2018

In this presentation, Abdusalam Alhadid, started by introducing the problem of hard water in both domestic and industrial applications,caused by an excess of calcium and magnesium ions. It significantly decreases thelifetime and efficiency of equipment which has negative technical and economic consequences. Existing water softening technologies have several disadvantages, such as a high chemical use (crystallization, ion exchange), water and energy consumption (nanofiltration)

Donnan dialysis Water softening Cation-exchange membrane
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Towards the implementation of circular economy in the water softening industry: A technical, economic and environmental analysis

2020

Abstract To reduce the environmental impact of the industrial sectors, circular strategies should be implemented to purify the effluents and recover raw materials. In this context, a novel integrated methodological approach is proposed to identify the most suitable strategy to improve the sustainability of the water softening industry via the treatment and recycling of the produced wastewater. Different concentration technologies and energy supply systems are compared to find economically feasible and environmentally friendly treatment systems. The investigated chains present the same pre-treatment step (nanofiltration and crystallization) and different concentration technologies: Multi-Eff…

Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciCircular economy020209 energyStrategy and ManagementContext (language use)02 engineering and technologyMembrane distillationCO2 emissions7. Clean energyIndustrial and Manufacturing Engineering12. Responsible consumptionlaw.inventionIndustrial wastewaterlaw0202 electrical engineering electronic engineering information engineeringMembrane processesRecyclingEnergy supplyProcess engineeringReverse osmosisDistillation0505 lawGeneral Environmental ScienceRenewable Energy Sustainability and the Environmentbusiness.industry05 social sciencesEnvironmentally friendly6. Clean waterWater softening13. Climate action050501 criminologyEnvironmental scienceNanofiltrationbusinessTreatment chain
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Techno-economic assessment of multi-effect distillation process for the treatment and recycling of ion exchange resin spent brines

2019

Abstract A treatment chain including nanofiltration, crystallization and multi-effect distillation (MED) is for the first time proposed for the treatment of an effluent produced during the regeneration of Ion Exchange resins employed for water softening. The goal is to recover the minerals and to restore the regenerant solution to be reused in the next regeneration cycle. MED is the most crucial unit of the treatment chain from an economic point of view. A techno-economic analysis on the MED unit was performed and a novel performance indicator, named Levelized Brine Cost, was introduced as a measure of the economic feasibility of the process. Different scenarios were analysed, assuming diff…

Settore ING-IND/26 - Teoria Dello Sviluppo Dei Processi ChimiciCircular economyGeneral Chemical Engineering02 engineering and technology7. Clean energyBrine recycling12. Responsible consumptionlaw.invention020401 chemical engineeringlawIndustrial brines Multi-Effect Distillation Circular Economy Techno-economic analysis Brine recyclingGeneral Materials Science0204 chemical engineeringIon-exchange resinDistillationEffluentTechno-economic analysisWater Science and TechnologyWaste managementbusiness.industryMechanical EngineeringGeneral Chemistry021001 nanoscience & nanotechnologyMulti-effect distillation6. Clean waterWater softeningBrineMultiple-effect distillationEnvironmental scienceIndustrial brinesNanofiltration0210 nano-technologybusinessThermal energyDesalination
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