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Hydraulic characteristics analysis of an anaerobic rotatory biological contactor (AnRBC) using tracer experiments and response surface methodology (RSM)

  • Environmental Engineering
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Abstract

The hydraulic characteristic of an anaerobic rotating biological contactor (AnRBC) were studied by changing two important hydraulic factors effective in the treatment performance: the hydraulic retention time (τ) and rotational disk velocity (ω). The reactor hydraulic performance was analyzed by studying hydraulic residence time distributions (RTD) obtained from tracer (Rhodamine B) experiments. The experiments were conducted based on a central composite face-centered design (CCFD) and analyzed using response surface methodology (RSM). The region of exploration for the process was taken as the area enclosed by τ (60, 90 and 120 min) and ω (0.8 and 16 rpm) boundaries. Four dependent parameters, deviation from ideal retention time (Δτ), dead volume percentage and dispersion indexes (Morrill dispersion index (MDI) and dispersion number (d)), were computed as response. The maximum modeled Δτ and dead volume percentage was 43.03 min and 37.51% at τ and ω 120 min and 0 rpm, respectively. While, the minimum predicted responses (2.57 min and 8.08%) were obtained at τ and ω 60min and 16 rpm, respectively. The interaction showed that disk rotational velocity and hydraulic retention time played an important role in MDI in the reactor. The AnRBC hydraulic regime was classified as moderate and high dispersion (d=0.09 to 0.253). As a result, in addition to the factors studied, the reactor geometry showed significant effect on the hydraulic regime.

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Authors and Affiliations

  1. Young Researchers Club, Ilam Branch, Islamic Azad University, Ilam, Iran

    Yadollah Mansouri

  2. Water and Wastewater Research Center (WWRC), Department of Applied Chemistry, Faculty of Chemistry, Razi University, Kermanshah, Iran

    Ali Akbar Zinatizadeh

  3. Department of Environmental Health Engineering, Kermanshah Health Research Center (KHRC), Kermanshah University of Medical Sciences, Kermanshah, Iran

    Parviz Mohammadi

  4. Department of Analytical Chemistry, Faculty of Chemistry, Razi University, Kermanshah, Iran

    Mohsen Irandoust & Aazam Akhbari

  5. Sama Technical and Vocatinal Training College, Islamic Azad University, Kermanshah Branch, Kermanshah, Iran

    Aazam Akhbari

  6. Kermanshah Water and Wastewater Company, Kermanshah, Iran

    Reza Davoodi

Authors
  1. Yadollah Mansouri
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  2. Ali Akbar Zinatizadeh
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  3. Parviz Mohammadi
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  4. Mohsen Irandoust
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  5. Aazam Akhbari
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  6. Reza Davoodi
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Correspondence to Ali Akbar Zinatizadeh.

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Mansouri, Y., Zinatizadeh, A.A., Mohammadi, P. et al. Hydraulic characteristics analysis of an anaerobic rotatory biological contactor (AnRBC) using tracer experiments and response surface methodology (RSM). Korean J. Chem. Eng. 29, 891–902 (2012). https://doi.org/10.1007/s11814-011-0269-0

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  • DOI: https://doi.org/10.1007/s11814-011-0269-0

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