Occurrence and Fate of Polycyclic Aromatic Hydrocarbons in the Anaerobic-Anoxic-Oxic Wastewater Treatment Process

2012 ◽  
Vol 610-613 ◽  
pp. 1722-1725
Author(s):  
Hui Mei Sun ◽  
Wei Jun Tian ◽  
Yong Mei Wang
Keyword(s):  
Wastewater Treatment ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Removal Efficiency ◽  
Aromatic Hydrocarbons ◽  
Treatment Process ◽  
Eastern China ◽  
Treatment Plant ◽  
Secondary Stage ◽  
Log Kow ◽  
Polycyclic Aromatic

The occurrence and removal of polycyclic aromatic hydrocarbons (PAHs) was examined at different stages at a anaerobic-anoxic-oxic biological wastewater treatment plant in Qingdao City, eastern China. Results shown that 13 PAHs were detected at different treatment stage in wastewater and sludge. The total concentration in the influents was 15194.3ng/L, higher than the existing reports. Most abundant PAHs in influent were Naphthalene, Benzo(g,h,i)perylene, and Pyrene, accounting for 86.4%. The removal efficiencies of individual PAH compounds ranged from -7.5% to 73.5% in the total treatment process. A significant relationship was observed between the removal efficiency and log Kow of the PAH compounds in the grit stage (when the values of log Kow were higher than approximately 5), suggesting that these compounds were principally removed through sorption to sludge particles and transfer to sludge processing systems. In secondary stage, the removal efficiency of PAHs was only 4.4% due to impact of low temperature on biological activity. The removal efficiency of 28.8% indicated A2O process was not ideal in removing PAHs.

scholarly journals Stormwater inflow loading of polycyclic aromatic hydrocarbons into urban domestic wastewater treatment plant for separate sewer system

2019 ◽  
Vol 79 (7) ◽  
pp. 1426-1436 ◽  
Author(s):  
Noriatsu Ozaki ◽  
Takahiro Yamauchi ◽  
Tomonori Kindaichi ◽  
Akiyoshi Ohashi
Keyword(s):  
Wastewater Treatment ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Primary Source ◽  
Domestic Wastewater ◽  
Sewer System ◽  
Rainfall Events ◽  
Polycyclic Aromatic

Abstract Polycyclic aromatic hydrocarbons (PAHs) are common contaminants present in wastewater, and determination of their sources is important for their management in the environment. In this study, stormwater loading of PAHs during rainfall periods was evaluated for sewage inflow into a wastewater treatment plant (WWTP) for a separate sewer system. To accomplish this, sewage inflow volumes, suspended solid concentrations, and PAH concentrations were measured during eight rainfall events and on two no-rainfall days at the inlet of the plant. Based on a comparison between the rainfall and no-rainfall loading quantified by the measurements, excess PAH loadings with stormwater were evaluated for the rainfall events. The relationship between rainfall intensity and stormwater loading was then used to evaluate long-term stormwater loadings of water and PAHs. Their contributions to the sewage inflow were 0.7% and 1.0% for 1 year for water and the sum of 16 measured PAHs, respectively. Our measurements and estimates demonstrate that direct stormwater inflow is not a primary source of PAHs to the plant for this separate sewer system.

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