Electrodialysis applied to the treatment of an university sewage for water recovery

In the face of water shortages, the world seeks to explore all available options in reducing the over exploitation of limited freshwater resources. One of the surest available water resources is wastewater. As the population grows, industrial, agricultural, and domestic activities increase accordingly in order to cater for the voluminous needs of man. These activities produce large volumes of wastewater from which water can be reclaimed to serve many purposes. Over the years, conventional wastewater treatment processes have succeeded to some extent in treating effluents for discharge purposes. However, improvements in wastewater treatment processes are necessary in order to make treated wastewater re-usable for industrial, agricultural, and domestic purposes. Membrane technology has emerged as a favorite choice for reclaiming water from different wastewater streams for re-use. This review looks at the trending membrane technologies in wastewater treatment, their advantages and disadvantages. It also discusses membrane fouling, membrane cleaning, and membrane modules. Finally, recommendations for future research pertaining to the application of membrane technology in wastewater treatment are made.

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“…70-90% removal of TDS, total inorganic carbon, cations and anions. 23-52% removal of COD, BOD, colour, turbidity and TOC[62] …”

mentioning

confidence: 99%

Membrane Technologies in Wastewater Treatment: A Review

2020

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“…The conductivity reduced from~0.67 mS/cm to 0.2 mS/cm, obtaining an effluent appropriate for reuse (e.g., in cooling towers) with only slight fouling. Further tests were conducted with the secondary effluent from a small WWTP for a university campus sewage [419]. The conductivity of~1 mS/cm reduced to 0.05-0.1 mS/cm, with removals above 80% for cations and 70% for anions, and with E spec values of 0.104 kWh/m 3 increased by fouling to 0.119 kWh/m 3 .…”

Section: Desalination Of Municipal Wwtp Effluentsmentioning

confidence: 99%

Electrodialysis Applications in Wastewater Treatment for Environmental Protection and Resources Recovery: A Systematic Review on Progress and Perspectives

et al. 2020

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This paper presents a comprehensive review of studies on electrodialysis (ED) applications in wastewater treatment, outlining the current status and the future prospect. ED is a membrane process of separation under the action of an electric field, where ions are selectively transported across ion-exchange membranes. ED of both conventional or unconventional fashion has been tested to treat several waste or spent aqueous solutions, including effluents from various industrial processes, municipal wastewater or salt water treatment plants, and animal farms. Properties such as selectivity, high separation efficiency, and chemical-free treatment make ED methods adequate for desalination and other treatments with significant environmental benefits. ED technologies can be used in operations of concentration, dilution, desalination, regeneration, and valorisation to reclaim wastewater and recover water and/or other products, e.g., heavy metal ions, salts, acids/bases, nutrients, and organics, or electrical energy. Intense research activity has been directed towards developing enhanced or novel systems, showing that zero or minimal liquid discharge approaches can be techno-economically affordable and competitive. Despite few real plants having been installed, recent developments are opening new routes for the large-scale use of ED techniques in a plethora of treatment processes for wastewater.

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“…A fim de obter uma maior quantidade de íons por unidade de área de membrana, utiliza-se uma maior densidade de corrente, porém, neste caso, pode ocorrer o fenômeno de polarização por concentração ou até mesmo a dissociação da água em íons H + e OH -(OBERHERR, 2019). Deste modo, é necessário que se faça um estudo a respeito da solução a ser tratada, construindo-se a curva corrente-voltagem (do inglês Current -voltage curves -CVC) (ALBORNOZ et al, 2019).…”

Section: Fundamentação Teóricaunclassified

Tratamento de cátions sódio e potássio presentes em água produzida de petróleo sintética

Vogel

Beltrame

2022

R. Águas Subter.

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A indústria petroquímica possui um processo produtivo que gera grandes volumes de água com alta concentração de sais, tanto na exploração, quanto no refino. Para que esta água possa retornar ao meio ambiente, ou para que possa ser reutilizada no processo, a mesma deve passar por algum tipo de tratamento visando diminuir a concentração dos sais presentes. Então, este trabalho tem como objetivo estudar a remoção dos íons de sódio e potássio de uma água conta-minada por meio do processo de separação por membranas - eletrodiálise, simulando um efluente de extração do petróleo. A metodologia do estudo consistiu em utilizar soluções de cloreto de sódio e cloreto de potássio simulando uma água de lavagem de um processo de extração de petróleo, sendo essa solução tratada em um sistema de eletrodiálise. Foi aplicada uma corrente elétrica, através de uma fonte, e determinou-se o potencial da membrana. Também, avaliou-se o pH, condutividade e concentração das soluções. Os resultados obtidos demonstram que houve uma remoção de 78±1% de potássio e 66±3% de sódio. A taxa de desmineralização foi de 72±1% para o potássio e 65±1% para o sódio. Por fim, foram encontrados os valores de consumo energético os quais foram de 0,2 kWh/Kg para o potássio e 0,6 kWh/Kg para o sódio.

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Electrodialysis applied to the treatment of an university sewage for water recovery

Cited by 28 publications

References 29 publications

Membrane Technologies in Wastewater Treatment: A Review

Membrane Technologies in Wastewater Treatment: A Review

Electrodialysis Applications in Wastewater Treatment for Environmental Protection and Resources Recovery: A Systematic Review on Progress and Perspectives

Tratamento de cátions sódio e potássio presentes em água produzida de petróleo sintética

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