[Home ] [Archive]    
:: Main :: About :: Current Issue :: Archive :: Search :: Submit :: Contact ::
:: Volume 4, Number 3 (Summer, 2017) ::
Environ. health eng. manag. 2017, 4(3): 177-184 Back to browse issues page
Baffle and fixed media effects on coliform removal and bacterial die-off rate coefficient in waste stabilization ponds (a case study in Ahvaz)
Hossein Sasani *, Naser Mehrdadi, Behnoush Aminzadeh, Afshin Takdastan
corresponding author: PhD Student of Environmental Engineering, Department of Environmental Engineering, School of Environment, University of Tehran, Tehran, Iran , sasanihossein@ut.ac.ir
Abstract:   (270 Views)
Background: The use of waste stabilization ponds is one of the cheapest wastewater treatment processes. This study evaluated the effects of baffles and fixed media on coliform removal in facultative lagoons.
Methods: In this study, the settled wastewater from four pond systems of the city of Ahvaz was used as input. Each system was composed of two ponds that were connected to each other serially. Three of them were equipped with two, three, and four baffles. Packages of fixed media were installed in the first baffled pond equal to the number of baffles. During a 12-month sampling period from March 2016 to February 2017, the capability of each system to remove coliform with different detention times was studied.
Results: The control system with no baffle and no media reduced the coliform index by an average of 67% in a detention time of 6 to 12 days. Increasing the baffles and fixed media in the ponds improved the coliform removal efficiency; systems with two, three, and four baffles achieved coliform removal in the amounts of 77%, 81%, and 83%, respectively. The coliform die-off coefficients (Kb) were higher in the attached growth systems than in the control system. The coefficients were determined to be 0.21, 0.26, 0.29, and 0.31 d-1 for the second ponds of the control, two-, three-, and four-baffle systems,
Conclusion: This method can be used to upgrade the existing waste stabilization pond and to design new ponds with at least two baffles in the facultative lagoons.
Keywords: Waste stabilization ponds, Baffle, Fixed media, Die-off coefficient, Coliform removal
eprint link: http://eprints.kmu.ac.ir/id/eprint/26579
Full-Text [PDF 711 kb]   (135 Downloads)    
Type of Study: Research | Subject: Special
Received: 2017/09/13 | Accepted: 2017/09/13 | Published: 2017/09/13
Send email to the article author

Add your comments about this article
Your username or email:

Write the security code in the box >

DOI: 10.15171/EHEM.2017.25

XML     Print

Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

Sasani H, Mehrdadi N, Aminzadeh B, Takdastan A. Baffle and fixed media effects on coliform removal and bacterial die-off rate coefficient in waste stabilization ponds (a case study in Ahvaz). Environ. health eng. manag.. 2017; 4 (3) :177-184
URL: http://ehemj.com/article-1-280-en.html
Volume 4, Number 3 (Summer, 2017) Back to browse issues page
مجله مدیریت و مهندسی بهداشت محیط Environmental Health Engineering And Management Journal
Persian site map - English site map - Created in 0.05 seconds with 800 queries by yektaweb 3506