<i>Moringa oleifera</i> coagulation as pretreatment prior to microfiltration for membrane fouling mitigation

Katalo, Ronald; Okuda, Tetsuji; Nghiem, Long D.; Fujioka, Takahiro

doi:10.1039/c8ew00186c

Cited by 19 publications

(10 citation statements)

References 36 publications

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“…Reduced alum dosages of less than 60% than previously used were required, lowering the cost of the overall process. Recently, Katalo et al [297] demonstrated the effectiveness of using Reproduced with permission from [33]. Copyright © 2013, Elsevier.…”

Section: Ecological Impacts Of Ro Pretreatmentmentioning

confidence: 99%

Reverse osmosis pretreatment technologies and future trends: A comprehensive review

2019

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Recent progress in reverse osmosis (RO) technology is not limited to RO membrane materials, module designs and RO process optimization. It involves prior feed treatment which directly impacts RO system performance. The ongoing challenges of membrane fouling in RO membranes can be addressed by increasing the operational efficiency through the use of correct pretreatment options which can mitigate organic and inorganic fouling by selectively rejecting contaminants prior to reaching the RO unit. Highly polluted water resources have put critical stress on the existing conventional pretreatment techniques, whereby membrane pretreatment has emerged as a promising alternative. This paper provides an overview of the development and current trends in conventional and nonconventional RO pretreatment techniques whereby the techniques are critically reviewed to 2 inform readers of potential improvements in such areas. This paper addresses the major drawbacks of conventional pretreatment methods which have necessitated the use of membrane pretreatment techniques. Special attention is given to microfiltration, ultrafiltration and nanofiltration methods and their development in terms of advanced membrane materials based on ceramics and self-cleaning membranes. Studies from laboratory scale standalone systems, pilot scale and large scale integrated systems for performance, cost and ecological analysis have been reviewed to familiarize readers with the many factors which need to be analyzed for selection of the appropriate pretreatment method(s). The critical review in this paper will help researchers focus more on the areas which have room for further development for cost-effective and advanced RO pretreatment techniques.

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Section: Ecological Impacts Of Ro Pretreatmentmentioning

confidence: 99%

Reverse osmosis pretreatment technologies and future trends: A comprehensive review

2019

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“…Conventionally, the pretreatments comprise different methods, including disinfection, coagulation flocculation, and a filtration process, where all of them aim to remove foulants or their precursors [14]. As an example, Katalo et al [97] used Moringa oleífera seeds during pretreatment prior to microfiltration of river water. Moringa oleífera represents a non-toxic natural coagulant, which can be used in a conventional coagulation process.…”

Section: Alternative Novel Strategies In Biofouling Mitigationmentioning

confidence: 99%

“…Therefore, this approach not only represents a promising alternative in water treatment, but also its potentiality regards to the non-use of high-cost chemical coagulants, such as Al 2 (SO 4 ) 3 and FeCl 3 . Moreover, the seeds contain dimeric cationic proteins that substantially reduced membrane fouling by removing suspended solids and dissolving organic matter [97].…”

Section: Alternative Novel Strategies In Biofouling Mitigationmentioning

confidence: 99%

Current Advances in Biofouling Mitigation in Membranes for Water Treatment: An Overview

et al. 2020

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Membranes, as the primary tool in membrane separation techniques, tend to suffer external deposition of pollutants and microorganisms depending on the nature of the treating solutions. Such issues are well recognized as biofouling and is identified as the major drawback of pressure-driven membrane processes due to the influence of the separation performance of such membrane-based technologies. Herein, the aim of this review paper is to elucidate and discuss new insights on the ongoing development works at facing the biofouling phenomenon in membranes. This paper also provides an overview of the main strategies proposed by “membranologists” to improve the fouling resistance in membranes. Special attention has been paid to the fundamentals on membrane fouling as well as the relevant results in the framework of mitigating the issue. By analyzing the literature data and state-of-the-art, the concluding remarks and future trends in the field are given as well.

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“…Despite a lot of research reports show that conventional coagulants have higher coagulation efficiency compared to seeds powder of Moringa Oleifera. However, Moringa Oleifera seeds coagulation has advantages over alum coagulation, such as posttreatment can be avoided for pH adjustment [35]. Moringa Oleifera is also a natural resource is an easy availability, eco-friendly, non-toxic, biodegradable; thus, the use of Moringa Oleifera allows avoiding many adverse effects of conventional coagulants such as alum.…”

Section: Characterization Of Moringa Oleifera Seed Extractmentioning

confidence: 99%

Comparative study of the coagulation efficacy of Moringa Oleifera seeds extracts to alum for domestic wastewater treatment of Ain Aouda City, Morocco

et al. 2021

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This research aimed to investigate the performance of seeds extract of Moringa Oleifera (MO) as an eco-friendly coagulant and an alternative practice in enhancing primary domestic wastewater effluent treatment by coagulation/flocculation, and sedimentation. The seeds of Moringa Oleifera were dried, crushed, and sieved, the content of oil was extracted with n-hexane as a solvent employing soxhlet apparatus (electro thermal) then used the residue as domestic wastewater coagulant. Jar tests were conducted for improve the primary treatment of domestic wastewater effluent from the wastewater plant of Ain Aouda city, Rabat, Morocco. For this reason, perform of coagulation tests was comparative with using aluminium sulphate (alum). Moringa Oleifera seeds extract at the optimal dose of 250 mg/L shows encouraging results, by comparison with the use of alum (150 mg/L). In reality, in terms of TSS reduction 95.5% and 96.8%, while turbidity reduction 97.5% and 98.1% were obtained for MO seeds extract and alum, respectively. But, the reduction rate of COD and BOD of Alum was somewhat higher than that of MO seeds extract 81.8% and 76.8% for COD, while were 75.5% and 72% for BOD respectively. Differently from alum, observed that increase in the extract of MO seeds dosage happened a slight change in pH value, decrease conductivity, and three times less bulky quantity of sludge than alum. For avoiding the numerous disadvantages associated with the use of chemical coagulants, the usage of Moringa Oleifera seeds extracts is recommended.

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Moringa oleifera coagulation as pretreatment prior to microfiltration for membrane fouling mitigation

Abstract: Coagulation pretreatment using Moringa oleifera in the microfiltration of river water achieved membrane fouling mitigation and filtered water quality improvement.

Cited by 19 publications

References 36 publications

Reverse osmosis pretreatment technologies and future trends: A comprehensive review

Reverse osmosis pretreatment technologies and future trends: A comprehensive review

Current Advances in Biofouling Mitigation in Membranes for Water Treatment: An Overview

Comparative study of the coagulation efficacy of Moringa Oleifera seeds extracts to alum for domestic wastewater treatment of Ain Aouda City, Morocco

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