Cost And Performance Of A Hollow-Fiber Loose Nanofiltration Membrapilot-Plant For Aerated Groundwater Treatment

Keywords

Capital costs; Hollow fiber; Nanofiltration; Operating; Ultrafiltration

Abstract

The cost and performance of a hollow-fiber loose nanofiltration (HF-LNF) membrane process for potable water production was evaluated for an aerated, organic-laden, hard Florida groundwater containing slime bacteria. The HF-LNF process experienced no detectable fouling when sand filtration pretreatment was employed, and the membrane’s durability and performance remained unchanged while producing a consistent water quality for 2,074 h of pilot run-time. Results of the study showed that a HF-LNF membrane with a 1,000 Dalton cut-off removed turbidity, sulfate, total organic carbon (TOC) and color by an average of 82%, 10%, 25%, and 95%, respectively. A decrease in permeate back pressure from 100 to 0 psi (6.9 to 0 bar) resulted in an increase in the normalized specific flux from 1.2 to 1.5 gfd/psi (29.6 lmh/bar). This decrease of nearly 87% in operating pressures did not significantly (<3%) affect the membrane removal efficiency for turbidity, sulfate, nor TOC. Construction and operating costs for a 2 million gal/d (permeate) HF-LNF process employing sand filtration for pretreatment and operating at an 85% water recovery rate was estimated to be $4.4 million and $0.57/kgal, respectively.

Publication Date

8-1-2018

Publication Title

Desalination and Water Treatment

Volume

124

Number of Pages

1-10

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.5004/dwt.2018.23176

Socpus ID

85054730674 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85054730674

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