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Process modeling and optimization of biological removal of carbon, nitrogen and phosphorus from hospital wastewater in a continuous feeding & intermittent discharge (CFID) bioreactor

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Abstract

We evaluated the feasibility and treatment performance of a continuous feeding and intermittent discharge (CFID) bioreactor treating real hospital wastewater with the emphasis on simultaneous carbon, nitrogen and phosphorus (CNP) removal. The experiments were based on a central composite design (CCD) and analyzed by response surface methodology (RSM). To analyze the process, three significant variables, aeration time (2–4 h), mixing time without aeration (30–90 min) and MLSS concentration (2,000–6,000mg/l), were studied. Results show that an increase in aeration time increased the nitrogen and phosphorous removal efficiency. However, when the aeration time was more than 3 h, the efficiency of phosphorous removal was decreased due to insufficient acidification. A similar scenario was observed when mixing time was increased for phosphorus and nitrogen removal efficiency. MLSS had a positive effect on all the responses. Under optimal conditions, the concentrations of quality parameter in the influent in average were recorded as 586 mg COD/l, 296mg BOD5/l, 97mgTN/l and 16.47mg TP/l, which yields the following removal efficiencies, 95.6%, 98.3%, 88.0% and 92.0%, respectively.

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Authors and Affiliations

  1. Research Center for Environmental Determination of Health (RCEDH), Kermanshah University of Medical Sciences, Kermanshah, Iran

    Meghdad Pirsaheb & Amir Mohammad Mansouri

  2. Student Research Committee, Kermanshah University of Medical Science, Kermanshah, Iran

    Mitra Mohamadi

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

    Amir Mohammad Mansouri

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

    Ali Akbar Lorestani Zinatizadeh

  5. Department of Environmental Engineering, Faculty of Engineering and Green Technology, UniversitiTunku Abdul Rahman, Kampar, Perak, Malaysia

    Sethupathi Sumathi

  6. Department of Environmental Health Engineering, School of Public Health, Kermanshah University of Medical Sciences, Kermanshah, Iran

    Kiomars Sharafi

  7. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Kermanshah, Iran

    Kiomars Sharafi

Authors
  1. Meghdad Pirsaheb
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  2. Mitra Mohamadi
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  3. Amir Mohammad Mansouri
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  4. Ali Akbar Lorestani Zinatizadeh
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  5. Sethupathi Sumathi
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  6. Kiomars Sharafi
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Corresponding authors

Correspondence to Meghdad Pirsaheb or Amir Mohammad Mansouri.

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Pirsaheb, M., Mohamadi, M., Mansouri, A.M. et al. Process modeling and optimization of biological removal of carbon, nitrogen and phosphorus from hospital wastewater in a continuous feeding & intermittent discharge (CFID) bioreactor. Korean J. Chem. Eng. 32, 1340–1353 (2015). https://doi.org/10.1007/s11814-014-0365-z

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  • DOI: https://doi.org/10.1007/s11814-014-0365-z

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