Design and Performance of a Membrane-Aerated Biofilm Reactor for Wastewater Containing Phenol and Ammoniacal Nitrogen

کد مقاله : 1576-IWWA

نویسندگان

آرمان درخشانی * کارشناس آزمایشگاه

چکیده مقاله

Contamination of industrial wastewater with phenolic compounds and ammoniacal nitrogen is a major challenge in biological wastewater treatment because of their biological toxicity and adverse environmental effects. In this study, the performance of a membrane-aerated biofilm reactor (MABR) was evaluated for phenol removal and ammoniacal nitrogen conversion under various operating conditions. In this system, oxygen is delivered bubble-free to the biofilm through a gas-permeable membrane, whereas phenol and ammonium diffuse into the biofilm from the bulk liquid. The effects of hydraulic retention time (HRT, 6–24 h), influent phenol concentration (50–500 mg/L), influent NH4-N concentration (20–150 mg/L), membrane aeration pressure (0.05–0.25 bar) and biofilm thickness (200–800 µm) were investigated. Increasing the HRT from 6 to 18 h raised phenol removal from 81.5% to 93.1% and NH4-N removal from 75.3% to 91.0%. Increasing the phenol loading decreased phenol removal from 94.4% to 85.1%. A biofilm thickness of 450 µm gave the highest removal efficiency. However, a decrease in NH4-N concentration alone does not equal true total nitrogen removal: the nitrogen mass balance showed that true total nitrogen removal (approximately 16–23%) was considerably lower than the apparent NH4-N removal efficiency.

کلیدواژه ها

membrane-aerated biofilm reactor, phenol, ammoniacal nitrogen, nitrification, biofilm thickness

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