Post-treatment of secondary wastewater treatment plant effluent using a two-stage fluidized bed bioreactor system

Journal of Environmental Health Science Engineering

Mansur Zarrabi⁴  Amir Hossein Mahvi³  Kaan Yetilmezsoy²  Golam Hossein Safari¹ 

[1]Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran

[2]Department of Environmental Engineering, Faculty of Civil Engineering, Yildiz Technical University, Istanbul, Turkey

[3]Department of Environmental Health Engineering & Center of Water Quality Research, Tehran University of Medical Sciences, Tehran, Iran

[4]Department of Environmental Health Engineering, Faculty of Health, Alborz University of Medical Sciences, Karaj, Iran

关键词: Fluidized bed reactor;    Coliform;    COD;    Secondary effluent;   

Others  :  820674
DOI  :  10.1186/2052-336X-11-10

 received in 2012-12-17, accepted in 2013-06-09,  发布年份 2013

【 摘 要 】

The aim of this study was to investigate the performance of a two-stage fluidized bed reactor (FBR) system for the post-treatment of secondary wastewater treatment plant effluents (Shahrak Gharb, Tehran, Iran). The proposed treatment scheme was evaluated using pilot-scale reactors (106-L of capacity) filled with PVC as the fluidized bed (first stage) and gravel for the filtration purpose (second stage). Aluminum sulfate (30 mg/L) and chlorine (1 mg/L) were used for the coagulation and disinfection of the effluent, respectively. To monitor the performance of the FBR system, variation of several parameters (biochemical oxygen demand (BOD₅), chemical oxygen demand (COD), turbidity, total phosphorous, total coliform and fecal coliform) were monitored in the effluent wastewater samples. The results showed that the proposed system could effectively reduce BOD₅ and COD below 1.95 and 4.06 mg/L, respectively. Turbidity of the effluent could be achieved below 0.75 NTU, which was lower than those reported for the disinfection purpose. The total phosphorus was reduced to 0.52 mg/L, which was near the present phosphorous standard for the prevention of eutrophication process. Depending on both microorganism concentration and applied surface loading rates (5–10 m/h), about 35 to 75% and 67 to 97% of coliform were removed without and with the chlorine addition, respectively. Findings of this study clearly confirmed the efficiency of the FBR system for the post-treatment of the secondary wastewater treatment plant effluents without any solid problem during the chlorination.

【 授权许可】

   
2013 Safari et al.; licensee BioMed Central Ltd.

【 图 表 】

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