Paper Information

Journal:   JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)   JANUARY 2008 , Volume 41 , Number 6 (108); Page(s) 699 To 707.
 
Paper: 

PERFORMANCE OF AN OVERLAND FLOW SYSTEM FOR ADVANCED TREATMENT OF WASTEWATER PLANT EFFLUENT

 
 
Author(s):  TAEBI A., GHODOUSI HAMID
 
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Abstract: 

Overland flow (OF) systems were evaluated and compared for advanced treatment of municipal and industrial effluents, including nutrients and nondegradable chemical oxygen demand (COD) removal. Three pilot plants were constructed at the Shahin Shahr Wastewater Treatment Plant (WWTP), Isfahan, Iran. Each pilot was assigned a specific wastewater and all were simultaneously operated for eight months. Treatment of primary effluent, activated sludge secondary effluent, and lagoon effluent of textile wastewater was investigated at application rates (ARs) of 0.15, 0.25, and 0.35 m3 m1 h1. During five months of stable operation after a three month acclimation period, mean removals of total 5-day biochemical oxygen demand (TBOD5), total COD (TCOD), total suspended solids (TSS), total nitrogen (TN), total phosphorus (TP) and turbidity were 74.5, 54.8, 66.2, 39.4, 35.8, and 67.7% for primary effluent; 52.9, 52.9, 66.5, 44.4, 39.8, and 50.1% for activated sludge effluent; 65.7, 58.7, 70.3, 41.7, 41.3, and 54.9% for textile wastewater lagoon effluent, respectively. The model of Smith and Schroeder (15) was satisfactory for TBOD5. For all treatment parameters a standard first-order removal model was inadequate to represent the data but a modified first-order model provided a satisfactory fit to the data. Overall, it can be concluded that an OF system as advanced treatment has the ability to meet effluent discharge permit limits and is an economical replacement for stabilization ponds and mechanical treatment options.

 
Keyword(s): ACTIVATED SLUDGE, ADVANCED TREATMENT, OVERLAND FLOW, PRIMARY EFFLUENT, TEXTILE WASTEWATER
 
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