Operating cost reduction of a membrane bioreactor showcasing the industrial wastewater treatment plant of Thor, Speyer (Germany).
As part of an optimization project for Thor´s on-site wastewater treatment plant, options for reducing the operating cost of a membrane bioreactor (MBR) had to be evaluated and implemented. In particular, high suspended solids (MLSS) contents of up to 65 g/L, high salt loads and a large proportion of fibrous components in the wastewater each meant big challenges – more so, aiming at resolving all of them in one approach.
Due to the smart choice of a suitable pre-separation, the braiding tendency of the tubular membranes could be eliminated in the first step.
As a result, after that the filtration system could be equipped with T-CUT UF series membrane modules with a significantly smaller inner membrane diameter.
This membrane tube ID reduction from a diameter of one inch to ½ inch vastly increased the packing density of the installed modules.
In addition to the larger membrane area resulting thereof, the elimination of the braiding tendency was another reason why the specific pump output per permeate volume obtained could be kept stable per hour.
The third success factor of the project was the MLSS reduction. By reducing the MLSS content, on the one hand the required flow velocity could be reduced and at the same time the flux of the T-CUT UF modules could be increased.
The sum of all optimization revealed a significant saving potential. Due to the measures taken, the total energy requirement of the filtration system could be reduced by around 30%.
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