Optimization and fouling mechanism of a thermophile submerged MBR (TSMBR) pilot plant for wastewater treatment in a paper mill

Autor:
Cramer M., Kloth S., Tränckner J.
In:

Journal of Water Process Engineering

Auflage: 17 (June 2017)
ISBN: 2214-7144
DOI: http://dx.doi.org/10.1016/j.jwpe.2017.02.008
Seite: 110 - 116
Jahr: 2017

Einordung:
Institut: Professur Wasserwirtschaft

Abstract:
The state-of-art is a mesophilic treatment of wastewater in paper mills without reuse due to the high water quality requirements. Thermophilic biological treatment could save a large amount of thermal energy, but the major obstacle of a reuse are the poor sludge settling properties under thermophile conditions, leading to insufficient water quality if conventional gravimetric phase separation is applied. MBR technology is a promising alternative which allows a recirculation of treated water for improving the water and energy footprint. So far, there is only limited experience with thermophilic MBR at the time. In this study, a thermophilic MBR with a submerged membrane (TSMBR) was operated to treat wastewater from a paper mill with a COD concentration of 25–30 g L−1. The TSMBR was integrated into the operational process of the paper mill. Research questions were the influence of suspended solids, food to microorganism ratio (F/M ratio), cross-flow-aeration and filtration flux to the fouling of the membrane. Applying the critical flux concept, optimal operating conditions and costs for a future economic full-scale implementation could be derived.

Key results are inter alia a sub-critical flux of below 10 L m−2 h−1 is recommended for long-time durability of the membrane for minimizing the irreversible fouling and the permeability decrease. A chemical cleaning does not change the critical flux, but improves the permeability of the membrane significantly. The TSMBR suffered from increasing fouling at a cross-flow-aeration of below 0.6 m3 m−2 h−1 and a concentration of suspended solids of above 14 g L−1. A stable process and cleaning could only be ensured by a F/M ratio of below 0.4 gCOD gMLSS−1 d−1. Higher values result in an increased cake layer formation and intensive foaming.

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Letzte Änderung des Eintrages: 01.02.2018

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