Treatments and Recycle of Food Processor Wastewater Effluent

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Date
2019-08-29
Authors
Jamal Uddin, Abu Taher
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Publisher
University of Guelph
Abstract

Effective best management practice (BMP) was developed for treating fruit processing membrane bioreactor (MBR) effluent for reuse. The micro-molecular soluble microbial products (SMP) and extracellular polymeric substances (EPS), which crossed through the 0.04 ยต ultrafiltration (UF) MBR and constituted in the effluent as dissolved organic matters (DOM), was found to foul and block the permeation of the down-stream RO membrane hindering the recycle and reuse processes. Efficient treatment composed of enhanced coagulation coupled with granular activated carbon (GAC) sorption, reduced the DOM content to about 98%, and consequently the fouling potential. This maintained steady performance without any flux decline, while the intermittent flush-cleaning removed loosely bound deposits, if any, from the membrane surface. Membrane preservation experiments showed steady permeation even after 3-4 months of preservation in deionized water, providing additional safety to the membrane during a shutdown period of the processing unit. The developed BMP will provide a sustainable reuse operation for the industrial partner, reducing freshwater needs.

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Keywords
MBR-RO, Fruit wastewater, SMP, EPS, TOC, BMP, Reuse
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