Abstract
Residual aluminum from coagulation process potentially results in operation problems for the subsequent treatment processes in the dairy wastewater treatment train such as membrane bioreactor (MBR). The objective of this study was to investigate the effect of residual aluminum (Al) on the performance and stability of MBR. A Hybrid Coagulation-MBR pilot was operated for 70 d using a hollow fiber membrane including four phases of operation. The finding of this study illustrated the MBR feasibility to control the Al concentration in the effluent to be below 0.5 mg/L, with >90% Al removal. The residual Al was predominantly accumulated in the sludge and removed from the reactor by controlled wasting. Moreover, the residual Al resulted in increasing the trans-membrane pressure with dTMP/dt equals 22.2, 31.6, and 35.3 mbar/d in the 1st, 2nd, and 3rd cleaning phase, respectively, resulting in irreversible membrane fouling. Overall, the combination of coagulation- MBR processes yielded up to 95% COD removal, subsequently, providing potential water reuse for the diary process.
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