Removal of fouling species from brackish water reverse osmosis reject stream

Ayoub, George M.; Korban, Lea Georges; Al‐Hindi, Mahmoud; Zayyat, Ramez M.

doi:10.1080/09593330.2017.1311946

Cited by 16 publications

(8 citation statements)

References 48 publications

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“…The removal effect of CaO and NaOH precipitation methods on Ca removal rates (73.0% and 91.2%, respectively), indicating a fast precipitation reaction rate of Ca 2+ (Rahardianto et al 2007;Ayoub et al 2018). From Fig.…”

Section: Cao and Naoh Precipitation Methods For Roc Treatmentmentioning

confidence: 82%

“…achieved the approximately 98% removal rate of Ca 2+ and Mg 2+ from ROC by adding Ca(OH)2 and Na2CO3. Some researchers have utilized a 2:1 ratio of NaOH and Na2CO3 to remove the majority of Ca 2+ and Mg 2+ (>95%) from ROC (Ayoub et al 2018). However, most of work only focus on improving ion removal efficiency by increasing feed which producing more sludge that is difficult to treat.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Calcium and Magnesium Ions from Reverse Osmosis Concentrate Using a Two-stage Precipitation with Carbonation Process

Liu,

Zhu,

et al. 2024

Preprint

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The reverse osmosis (RO) technique has been extensively employed in the advanced treatment of industrial water and wastewater. However, this process results in the production of a significant quantity of reverse osmosis concentrate (ROC), which contains high levels of salinity and organic contaminants, thereby posing serious environmental problems. This study reported a two-stage precipitation process utilizing quicklime (CaO) and caustic soda (NaOH) in conjunction with air blowing (carbonation) for the removal of Ca2+ and Mg2+ from real brackish water ROC of factory. In stage I, the CaO precipitation-carbonation process was employed to eliminate the majority of Ca2+ from the ROC, while leaving Mg2+ virtually unaffected, yielding high-purity CaCO3 precipitates. In stage II, the NaOH precipitation method was utilized to eliminate the remaining Ca2+ and Mg2+ from the ROC. It was demonstrated that under optimal conditions, the removal rates of Ca2+ and Mg2+ exceeded 97%. Finally, the characterization of precipitates demonstrated the generation of high-purity CaCO3 precipitates in stage I, as well as the formation of CaCO3 and Mg(OH)2 precipitates in stage II. The results confirmed the feasibility of employing the two-stage precipitation with carbonation process to economically treat ROC and enable its reuse, offering valuable insights for the treatment of industrial wastewater.

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Section: Cao and Naoh Precipitation Methods For Roc Treatmentmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Removal of Calcium and Magnesium Ions from Reverse Osmosis Concentrate Using a Two-stage Precipitation with Carbonation Process

Liu,

Zhu,

et al. 2024

Preprint

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“…Chemical precipitation, coagulation, oxidation and biological processes, or combinations thereof, can be used for brine treatment [101]. Several authors have explored the chemical precipitation process for extensive removal of scale-forming ions [58,147,148]. Additionally, coagulation is a basic physicochemical process for charge neutralization and adsorption of organics on metal hydroxides from water and wastewater.…”

Section: Conventional Technologiesmentioning

confidence: 99%

Reverse Osmosis Concentrate: Physicochemical Characteristics, Environmental Impact, and Technologies

et al. 2021

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This study’s aim is to generate a complete profile of reverse osmosis concentrate (ROC), including physicochemical characteristics, environmental impact, and technologies for ROC treatment, alongside element recovery with potential valorization. A systematic literature review was used to compile and analyze scientific information about ROC, and systematic identification and evaluation of the data/evidence in the articles were conducted using the methodological principles of grounded data theory. The literature analysis revealed that two actions are imperative: (1) countries should impose strict regulations to avoid the contamination of receiving water bodies and (2) desalination plants should apply circular economies. Currently, synergizing conventional and emerging technologies is the most efficient method to mitigate the environmental impact of desalination processes. However, constructed wetlands are an emerging technology that promise to be a viable multi-benefit solution, as they can provide simultaneous treatment of nutrients, metals, and trace organic contaminants at a relatively low cost, and are socially accepted; therefore, they are a sustainable solution.

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“…В настоящее время проводится много исследований, ставящих целью использовать обратноосмотические и нанофильтрационные мембраны для совершенствования технологий подготовки питьевой воды [11,[20][21][22][23][24]. Для этого подбираются мембраны с различными селективными свойствами [11], разрабатываются технологии сокращения расходов концентратов [20][21][22][23], а также технологии очистки и утилизации фугатов систем обезвоживания осадков [24]. В настоящей статье предложен новый подход к одновременному решению проблем, связанных с корректировкой ионного состава очищенной воды, а также утилизации концентрата мембранной установки и фугата.…”

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Study of effect of antioxidants and dietary fibres on microbiological and physicochemical properties of meat semi-finished products

Pervov,

Spitsov

2023

asj

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he article describes examples of membrane technologies (reverse osmosis and nanofiltration) applied for quality drinking water production. In drinking water production practices, natural water often contains contaminants of anthropogeneous origin, such as halogenocarbons. The main principles for controlling the ratio of concentrations of different species in permeate are presented. They are based on the use of membranes with low rejection that require two membrane stages to achieve the designed chloroform removal efficiency. It is demonstrated how the feed water is treated with low rejection membranes on the first stage, and feed water flow is reduced by 30 times, calcium ion concentration increases by 25 times, total dissolved solids value increases by 15 times, and chloroform concentration increases by 10 times. The article demonstrates the results of calculations to evaluate total operational costs for cases where concentrate is reduced by 100–150 times in volume and is withdrawn together with the dewatered sludge as sludge moisture. The presented data indicate that the application of the developed ion separation method reduces total operational costs by 35–45 percent.

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Removal of fouling species from brackish water reverse osmosis reject stream

Cited by 16 publications

References 48 publications

Removal of Calcium and Magnesium Ions from Reverse Osmosis Concentrate Using a Two-stage Precipitation with Carbonation Process

Removal of Calcium and Magnesium Ions from Reverse Osmosis Concentrate Using a Two-stage Precipitation with Carbonation Process

Reverse Osmosis Concentrate: Physicochemical Characteristics, Environmental Impact, and Technologies

Study of effect of antioxidants and dietary fibres on microbiological and physicochemical properties of meat semi-finished products

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