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Insights into the operational characteristics of a multi-habitat membrane bioreactor: Internal variation and membrane fouling

Paper ID Volume ID Publish Year Pages File Format Full-Text
2819 136 2016 8 PDF Available
Title
Insights into the operational characteristics of a multi-habitat membrane bioreactor: Internal variation and membrane fouling
Abstract

•Insights into the internal variation of a multi-habitat MBR were presented.•Permanent damage to membrane filterability may be caused by the growth of biomass.•Timely rheological information of MLSS could be detected by an on-line approach.•Variation of the torque and viscosity of the MLSS in reactor are highly consistant.

This work investigated the operational characteristics of a multi-habitat membrane bioreactor to reveal its internal variation and membrane fouling. During the 100d operating period, a combined anaerobic and aerobic zone gradually formed in a single membrane bioreactor. In the anaerobic zone, DO decreased to nearly zero, while in the aerobic zone, DO value still remained at above 3.1 mg/L, which created beneficial conditions for the removal of nitrogen (TN removal = 87.1%) and phosphorus (TP removal = 90.2%), although the phosphorus removal efficiency decreased in the later stage of operation (TP removal = 44.6%). The increase of torque in the bioreactor accorded with the Boltzmann model (r2 = 0.97891), and the growth trend between torque and apparent viscosity of the fluid was highly consistent, which implied that an on-line torque approach may play an important role in the timely detection of rheological information about the mixed liquor suspended solids. As operational time increased, the size of sludge particles in the aeration zone tended to decrease, and the permanent membrane resistance gradually increased. These relationships revealed the reason for accelerated membrane fouling. Scanning electron microscopy revealed that the membrane fouling was mainly caused by a compact fouling layer that formed on the surface of membrane module.

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Keywords
Membrane bioreactors; Waste-water treatment; Non-Newtonian fluids; Viscosity; Rheological behavior; Torque approach
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 105, Part A, 15 January 2016, Pages 189–196
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us