Mass Transfer And Transient Response Time Of A Split-Feed Nanofiltration Pilot Unit

Keywords

Homogeneous solution diffusion model; Log-logistic; Mass transfer; Nanofiltration; Nonlinear regression; Pilot plant; Split-feed; Transient response

Abstract

The transient response of a center-port nanofiltration membrane process was evaluated using a step-input dose of a sodium chloride solution. The pilot was configured as a two-stage, split-feed, center-port, 7:2 pressure vessel array process, where the feed water is fed to both ends of six-element pressure vessels, and permeate and concentrate streams are collected after only three membrane elements. The transient response was described as a log-logistic system with a maximum delay time of 285 s for an 85% water recovery and 267 gallon per minute feed flowrate. The log-logistic model was shown to be >98% accurate in predicting the transient response of the permeate streams. When compared with a first-order nonlinear regression model, there was no difference in the predictability of transient response when using the log-logistic model in first-stage and second-stage membrane processes. However, the log-logistic model was found to be more predictive in describing third-stage transient response by a factor of 236 over a first-order method. Furthermore, the homogeneous solution diffusion model was shown to effectively predict the permeate concentration for any transient permeate perturbation.

Publication Date

11-13-2016

Publication Title

Desalination and Water Treatment

Volume

57

Issue

53

Number of Pages

25388-25398

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1080/19443994.2016.1155498

Socpus ID

84961666369 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84961666369

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