Development of a control system for in-line coagulation in an ultrafiltration process

Blankert, Bastiaan; Betlem, Bernardus H.L.; Roffel, Brian

doi:10.1016/j.memsci.2007.05.033

Cited by 24 publications

(19 citation statements)

References 30 publications

(39 reference statements)

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“…5 Table 1 shows the theoretically estimated parameters for the complete blocking and the These results are consistent with the physical meaning and the definitions of the parameters of Hermia´s models adapted to crossflow filtration (Eq. (1) Tables 2 and 3 show the ANOVA table obtained for K. In Table 2, the ANOVA analysis showed a p-value of 0.0000 for the model.…”

supporting

confidence: 78%

“…This means that the chance that a particle settles on a free site is equal to the ratio of free and occupied sites. 5 It must be also noted that the intermediate blocking model adapted to crossflow ultrafiltration considers that the size of the solute molecules is similar to the membrane pore size. Therefore, membrane pore blocking occurs in the entrance of the membrane pores, which can be partially blocked or sealed.…”

Section: Resultsmentioning

confidence: 99%

“…13 Furthermore, it is assumed that the resistance is inversely proportional to the fraction of free pores. 5 Moreover, the intermediate blocking model adapted to crossflow filtration describes more accurately a real ultrafiltration process than the complete blocking model adapted to crossflow filtration. In the first one, solute molecules can superimpose over others that have previously covered up the membrane surface.…”

Section: Resultsmentioning

confidence: 99%

“…5 Several authors studied crossflow membrane ultrafiltration in terms of fouling resistances. Mondal and De 6 studied two fouling mechanisms (complete pore blocking and cake layer) during crossflow membrane filtration and they obtained their resistance values.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Analysis of fouling resistances under dynamic membrane filtration

Vincent‐Vela

Cuartas-Uribe

Álvarez-Blanco

et al. 2011

Chemical Engineering and Processing: Process Intensification

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supporting

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of fouling resistances under dynamic membrane filtration

Vincent‐Vela

Cuartas-Uribe

Álvarez-Blanco

et al. 2011

Chemical Engineering and Processing: Process Intensification

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show abstract

“…Blankert et al [60] studied the combination of in-line coagulation and ultrafiltration with raw water from a Dutch river on a pilot scale. They found a correlation between the coagulant dosage and the initial resistance of the last dead-end filtration before the chemical cleaning phase that could be used for feed-backward control.…”

Section: Feed-backward Control Based On Dosed Water Qualitymentioning

confidence: 99%

State of the Art of Online Monitoring and Control of the Coagulation Process

Ratnaweera

Fettig

2015

Water

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Abstract:Coagulation is an essential process for the removal of suspended and colloidal material from water and wastewater. However, no comprehensive or universally accepted mathematical description of the process has been developed so far. Therefore, process optimization and control is usually based on data from jar tests and simple flow-proportional dosing concepts, while more accurate concepts based on water quality parameters that can be measured online are emerging. In addition, there have been attempts to develop software sensors and control schemes that involve advanced mathematical analyses of these parameters. The paper presents an overview of the parameters and physical sensors that are used for feed-forward and feed-backward control schemes and the experiences that have been made with their implementation. Moreover, the development and use of software sensors is described. Finally, the practical applications of different control techniques are given in order to illustrate the state of the art of coagulation control. Some thoughts about research needs conclude this review.

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Micro‐coagulation effects on direct ultrafiltration of challenging raw river water

Ferrer

Dekker

Mesa

et al. 2016

J of Chemical Tech & Biotech

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Background\ud \ud The feasibility and competitiveness of substituting the conventional pre-treatment of drinking water treatment plants (dioxichlorination, coagulation/flocculation, settling, sand filtration) by raw river water direct ultrafiltration (UF) was addressed.\ud \ud Results\ud \ud A full scale UF module was operated continuously for 2 years, treating highly variable surface water. The sustainable hydraulic conditions leading to a greater water yield from the direct UF treatment scheme under different scenarios were defined. Summer periods enabled the attainment of higher filtration fluxes, although raw river water showed greater turbidity and total suspended solids content. Winter periods presented higher dissolved organic carbon concentration, with greater biopolymers content, which have been claimed as main membrane foulants. A preliminary micro-coagulation of FeCl3 (<1.5 mg Fe(III) L-1) enabled supporting harsher hydraulic conditions and thus, implementing similar conditions throughout the year. Impacts of micro-coagulation were more pronounced on filtration, particularly in winter, but a positive effect was also noticed in hydraulic and chemical cleaning stages, increasing the efficiency of the former and decreasing by half the frequency of the latter.\ud \ud Conclusion\ud \ud Direct UF proved to be competitive with the current conventional pre-treatment, leading to a significant reduction in reagents needs and sludge production and an increased and more stable product water quality. © 2016 Society of Chemical IndustryPeer ReviewedPostprint (author's final draft

show abstract

Development of a control system for in-line coagulation in an ultrafiltration process

Cited by 24 publications

References 30 publications

Analysis of fouling resistances under dynamic membrane filtration

Analysis of fouling resistances under dynamic membrane filtration

State of the Art of Online Monitoring and Control of the Coagulation Process

Micro‐coagulation effects on direct ultrafiltration of challenging raw river water

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