Abstract
In recent decades, there has been increasing interest in wastewater treatment because of its direct impact on the environment and public health. Over time, other forms of treatment have been developed and modified, including extended aeration. This process is included in the suspended growth system. In this paper, a comparative study was conducted between the efficiency of the extended aeration plant and that of the trickling filter plant in removal of BOD and COD. The method of comparison was done by knowing the value of the pollutant before and after the treatment and then extract the removal ratio of each pollutant within each plant. The results showed that the percentage of removal of BOD in the trickling filter was 79.5% while in extended aeration was 90.7%. The efficiency of COD removal was 60% in trickling filter and 86% in extended aeration. The study was carried out at the Barrakiyah WWTP in Najaf province in Iraq. As the plant contains these two types of treatment, and the study has been achieved through monthly examinations over a full year.
Highlights
Over the past years, many experiments and studies have been conducted for the purpose of improving wastewater treatment processes and developing them in a way that meets the requirements of health standards (Khudair and Jasim, 2017)
It is considered one of the oldest methods of wastewater treatment (Nikmanesh and Eslami, 2018). (Heidari, et al, 2016) carried out a study to evaluate the performance of extended aeration in the removal of BOD and COD, where the value of influent BOD and COD of about 388 mg/L 643 mg/L, results found that the removal percentage of BOD and COD up to 91.7% and 91.9% and this is a good indicator of the efficiency of this process. (Al-Shammari and Shahalam, 2019) presented a study of the Jahra wastewater treatment plant in Kuwait, which operates the extended aeration system with an actual capacity of 65000 m3/day, and the percentage of removal of BOD and COD was about 85% and 81%
The results showed an increase in efficiency of BOD removal by 10%
Summary
Many experiments and studies have been conducted for the purpose of improving wastewater treatment processes and developing them in a way that meets the requirements of health standards (Khudair and Jasim, 2017). The trickling filter is the traditional application of attached growth system It is considered one of the oldest methods of wastewater treatment (Nikmanesh and Eslami, 2018). (Al-Shammari and Shahalam, 2019) presented a study of the Jahra wastewater treatment plant in Kuwait, which operates the extended aeration system with an actual capacity of 65000 m3/day, and the percentage of removal of BOD and COD was about 85% and 81%. Another study was conducted by (Hashimzadeh, et al, 2017) to evaluate performance of full scale extended aeration plant and the efficiency for BOD and COD removal was 85.2% and 82.4%. Another study was conducted by (Ewida, et al, 2006) to improve the efficiency of the trickling filter by replacing the old traditional circular nozzles with radial nozzles for the purpose of improving oxygen transfer and increasing the wetting of the media. The comparison under real conditions through the analysis of the real plant examinations containing the two systems, which is Albarrakiya WWTP in the province of Najaf, Iraq
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