Operating cost reduction of UF membrane filtration process for drinking water treatment attributed to chemical cleaning optimization

Yoo, Sung-Shik; Chu, Kyoung Hoon; Choi, Ilhwan; Mang, Ji Sung; Ko, Kyunbyoung

doi:10.1016/j.jenvman.2017.02.072

Cited by 36 publications

(15 citation statements)

References 36 publications

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“…Several approaches can be employed to minimize the occurrence of fouling, such as an adequate pretreatment of the wastewater to be treated [6], optimization of chemical cleaning [7], the employment of backpulses or backwashes [3] and modification of the membrane surface in order to give superhydrophilic properties to the membrane [8]. Nanoparticles are widely used for this purpose, titanium dioxide (TiO 2 ) being the most studied due to its particular advantages [9].…”

Section: Introductionmentioning

confidence: 99%

Novel Submerged Photocatalytic Membrane Reactor for Treatment of Olive Mill Wastewaters

et al. 2019

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A new hybrid photocatalytic membrane reactor that can easily be scaled-up was designed, assembled and used to test photocatalytic membranes developed using the sol-gel technique. Extremely high removals of total suspended solids, chemical oxygen demand, total organic carbon, phenolic and volatile compounds were obtained when the hybrid photocatalytic membrane reactor was used to treat olive mill wastewaters. The submerged photocatalytic membrane reactor proposed and the modified membranes represent a step forward towards the development of new advanced treatment technology able to cope with several water and wastewater contaminants.

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Section: Introductionmentioning

confidence: 99%

Novel Submerged Photocatalytic Membrane Reactor for Treatment of Olive Mill Wastewaters

et al. 2019

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“…Operating conditions of EFM that were used in the plant in this study were: 200 ppm of NaOCl, 2 days of chemical interval, and 40 min of duration time. These operating conditions of E and EFM are the same as those of my previous study [4].…”

Section: Methodsmentioning

confidence: 92%

“…To accumulate irreversible fouling rapidly, it was operated at a higher permeate flux (60 LMH) than the original permeate flux of this plant, which is 50 LMH, and EFM, which is one of chemical cleaning methods applied, was not conducted. Based on the operation results, variations of transmembrane pressure (TMP) were measured using Sensys SSGC pressure sensors (Korea) and membrane resistance was calculated using Equation (4). All TMP data were adjusted to 20 • C equivalent value considering the change in water viscosity.…”

Section: Pilot-scale Plant Operationmentioning

confidence: 99%

“…The membrane filtration process is one of the advanced treatment processes that has attracted attention because of its ease of operation, requirement of a relatively small area, and its stability in obtaining effluent [2,3]. This process, however, has the disadvantage of relatively high operating cost, such as expenses for sludge disposal, membrane replacement, and, chemical agents; this is a problem to be solved for a wide range of applications of this process [4].…”

Section: Introductionmentioning

confidence: 99%

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Operating Cost Reduction of In-line Coagulation/Ultrafiltration Membrane Process Attributed to Coagulation Condition Optimization for Irreversible Fouling Control

Yoo

2018

Water

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This study examined the optimum coagulation conditions for reducing irreversible fouling during the in-line coagulation/ultrafiltration (UF) membrane process and assessed the decrease in operating cost. The coagulation conditions that generated charge-neutralization, sweep-flocculation, and under-dosing mechanisms were obtained by a jar-test, and a pilot-scale in-line coagulation/UF membrane process was operated under the coagulation conditions. Charge-neutralization and sweep-flocculation mechanisms reduced irreversible fouling effectively, and the under-dosing mechanism was able to reduce irreversible fouling only when flocs of a certain size or larger were formed. This revealed that floc size was a more important factor in reducing irreversible fouling than floc structure, and once initial cake layers were created by flocs of a fixed size, the structure of formed cake layers had only a minor effect on irreversible fouling. Regarding reduction in operating cost, 0.5 mg/L and 3 h, which were necessary to produce an under-dosing mechanism, were deemed the optimum coagulant dosage and coagulant injection time, respectively, to reduce irreversible fouling. In order to analyze the operating cost reduction effect, a pilot plant was operated under optimum operating conditions, and the total operating cost was approximately 11.2% lower than without in-line coagulation.The main coagulation mechanisms of a conventional treatment system are charge-neutralization and sweep-flocculation [11,12]. Charge-neutralization is the cause of unstable conditions by instilling coagulants with a positive charge into the contaminants that possess a negative charge in order to alter the zeta potential of the contaminants in question to as close to zero as possible [13]. Sweep-flocculation means that metal salt is added to water at a concentration high enough to cause precipitation of metal hydroxide. Colloidal particles can be enmeshed in these precipitates [14]. The coagulation-membrane filtration hybrid process, which consists of coagulation-flocculation-sedimentation-filtration, is a process that improves water quality and reduces membrane fouling by removing foulants through flocculation and sedimentation before membrane filtration occurs. In this process, the high removal rate of contaminants leads to improvement in the performance of the membrane filtration process. Therefore, the coagulation conditions (coagulant type, amount of feed, pH) that cause charge-neutralization and sweep-flocculation mechanisms, which were proposed as a conventional treatment process, were the optimal coagulation conditions for reducing membrane fouling [15,16].The in-line coagulation process, which can reduce the footprint of treatment, has been widely applied in membrane filtration methods as a pretreatment process to coagulation [3,16]. In this system, the coagulants may be injected "in-line" but in the absence of flocculation/sedimentation, the coagulated water will be filtered by the membrane directly. Not only destabilized contaminants or their agg...

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“…This problem has made scientists think of reusing water again after treatment. Therefore, many methods of treatment have been used such as filtration [32], biodegradation [33], adsorption [34], and photocatalytic degradation [35] of contaminant especially the organic molecules. Among these methods, adsorption is the simplest, cheapest, and most versatile technique for treating water pollutants [30,36].…”

Section: Selective Adsorption and Degradation Over Decorated Titanatementioning

confidence: 99%

Selective Photodegradation Using Titanate Nanostructures

Zaki¹,

Rouby²

2019

Photocatalysts - Applications and Attributes

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Adsorption and photocatalytic degradation are considered as the most important ways of treating water from organic compounds. It would be very useful if the adsorption and photocatalytic properties are combined in the same catalyst used in the treatment. Titania is one of the best well-known photocatalysts. However, due to its poor selectivity, it is unfavorable for photocatalytic removal of highly toxic low-level organic pollutants in wastewater in the presence of other less toxic high-level pollutants. Recent trials to introduce selectivity for titania have been achieved via controlling the catalyst morphology or by modifying the catalyst surface. This chapter summarizes the control of selectivity of titanate nanostructures toward adsorption and/or photocatalytic degradation of toxic organic dyes. In the first part, the effect of morphologies of titanites on selective photocatalytic degradation of three food dyes (color yellow sunset, red allura, and red carmoisine) was discussed. In changing the morphology of titanite, each dye is being preferably adsorbed by one morphology and decomposing more rapidly. In the second part, the selective adsorption and/or photocatalytic degradation of methylene blue dye from mixed dye solution using sodium titanate (NaTNT), cobalt-doped titanate nanotubes (co-doped TNT), and the decorated one with gold nanoparticles has been discussed.

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Operating cost reduction of UF membrane filtration process for drinking water treatment attributed to chemical cleaning optimization

Cited by 36 publications

References 36 publications

Novel Submerged Photocatalytic Membrane Reactor for Treatment of Olive Mill Wastewaters

Novel Submerged Photocatalytic Membrane Reactor for Treatment of Olive Mill Wastewaters

Operating Cost Reduction of In-line Coagulation/Ultrafiltration Membrane Process Attributed to Coagulation Condition Optimization for Irreversible Fouling Control

Selective Photodegradation Using Titanate Nanostructures

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