Abstract
The biological treatment of gallic acid processing wastewater (GAPW) was carried out with laboratory-scale 30-L expanded granular sludge bed (EGSB) and 60-L bio-contact oxidation (BCO) reactors. The temperatures of the EGSB and bio-contact oxidation reactors were maintained under mesophilic conditions of 35 and 32°C, respectively. The effluent chemical oxygen demand (COD), total nitrogen, total phosphorus, gallic acid levels, and pH values of both the EGSB and bio-contact oxidation reactors, and redox potential of the EGSB were monitored. When the influent COD concentration was 3,000 mg L−1 and the organic loading rate (OLR) was 17.5 kg COD (m3 d)−1, the removal efficiency of COD by the EGSB and bio-contact oxidation reactors was 87.021%. The removal efficiencies of nitrogen, phosphorus, and gallic acid were 70.822, 58.116, and 63.407%, respectively. The redox potential in the EGSB varied between −320 and −350 mV. The effluent pH increased either in the EGSB or the bio-contact oxidation reactor. Both reactors were resistant to shock loading. The results of our study provided a theoretical basis for the biological treatment of GAPW.
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