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Compact secondary treatment train combining a lab-scale moving bed biofilm reactor and enhanced flotation processes

Catherine Brosseau, Bettina Émile, Marc-André Labelle, Édith Laflamme, Peter L. Dold and Yves Comeau

Article (2016)

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Cite this document: Brosseau, C., Émile, B., Labelle, M.-A., Laflamme, É., Dold, P. L. & Comeau, Y. (2016). Compact secondary treatment train combining a lab-scale moving bed biofilm reactor and enhanced flotation processes. Water Research, 106, p. 571-582. doi:10.1016/j.watres.2016.10.019
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Abstract

High-rate wastewater processes are receiving a renewed interest to obtain energy positive/efficient water resource recovery facilities. An innovative treatment train combining a high-rate moving bed biofilm reactor (HR-MBBR) with an enhanced flotation process was studied. The two objectives of this work were 1) to maximize the conversion of soluble organics to particulate matter in an HR-MBBR and 2) to maximize the particulate matter recovery from the HR-MBBR effluent by green chemicals to enhance biogas production by anaerobic digestion. To achieve these objectives, lab-scale MBBRs fed with synthetic soluble wastewater were operated at organic loading rates (OLRs) between 4 and 34 kg COD m−3 reactor d−1 corresponding to hydraulic retention times (HRTs) between 6 and 54 min. Colloidal and soluble chemical oxygen demand (COD) removal efficiency in the HR-MBBR increased with HRT to reach a plateau of 85% at an HRT longer than 27 min. Carrier clogging observed at an OLR higher than 16 kg COD m−3 d−1 (HRT < 13 min) resulted in about 23% loss in colloidal and soluble COD removal efficiency. Thus, the recommended parameters were between 22 and 37 min and between 6 and 10 kg COD m−3 d−1 for the HRT and the OLR, respectively, to maximize the conversion of soluble organics to particulate matter. Total suspended solids (TSS) recovery of 58–85% and 90–97% were achieved by enhanced flotation using green and unbiodegradable chemicals, respectively, corresponding to a TSS effluent concentration below 14 and 7 mg TSS/L. Among the synthetic polymers tested, a high molecular weight and low charge density cationic polyacrylamide was found to give the best results with less than 2 mg TSS/L in the clarified effluent (97% TSS recovery). Green chemicals, although performing slightly less for solids separation than unbiodegradable chemicals, achieved a mean TSS concentration of 10 ± 3 mg/L in the clarified effluent.

Uncontrolled Keywords

Moving bed biofilm reactor, Innovative separation process, Enhanced flotation, Green coagulant, Green polymer, High-rate process

Open Access document in PolyPublie
Subjects: 1500 Génie de l'environnement > 1502 Traitement des eaux usées
Department: Département des génies civil, géologique et des mines
Research Center: Non applicable
Funders: CRSNG/NSERC, FRQ-NT, Veolia Water Technologies Canada Inc., Ville de Repentigny, EnviroSim Associates Ltd.
Grant number: RDCP J 435326-12
Date Deposited: 09 Dec 2016 14:39
Last Modified: 01 Dec 2018 01:15
PolyPublie URL: https://publications.polymtl.ca/2364/
Document issued by the official publisher
Journal Title: Water Research (vol. 106)
Publisher: Elsevier
Official URL: https://doi.org/10.1016/j.watres.2016.10.019

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