:: Volume 3, Number 4 (Fall 2016) ::
IAHS 2016, 3(4): 201-205 Back to browse issues page
Effect of Dissolved Air Flotation Process on Thickening of Activated Sludge
A. Atamaleki1, Gh.R. Mostafaii *2, M.B. Miranzadeh1, L. Iranshahi1, H. Akbari3, H. Safari1
1- Environmental Health Engineering Department, Public Health School, Kashan University of Medical Sciences, Kashan, Iran
2- Environmental Health Engineering Department, Public Health School, Kashan University of Medical Sciences, Kashan, Iran , mostafai_gr@kaums.ac.ir
3- Biostatistics & Public Health Department, Health Faculty, Kashan University of Medical Sciences, Kashan, Iran
Abstract:   (296 Views)

Aims: Sludge is an inescapable component of all wastewaters that originated from their treatment. dissolved air flotation (DAF) process as an alternative clarifier is used in treatment of drinking water, pretreatment of wastewater, and as a phase separator in sludge activation processes. This study aimed to calibrated the usage of DAF process in a laboratory scale and under various conditions, to achieve the optimum efficiency in recycling the activated sludge.

Instrument & Methods: In this experimental study, of Kashan's Shahid Beheshti hospital and immediately transported to the laboratory. The optimal dose of polyaluminum chloride coagulant and pH was determined and then applied in DAF process. Finally turbidity, electrical conductivity (EC) and total solids (TS) parameters were measured and compared with control sample.

Findings: The optimal pH and optimal dose of coagulant were 6.5 and 25mg/l, respectively. Also Optimal process efficiency to reduce EC, TS and turbidity parameters were 23.4, 44.5 and 88%, respectively.

Conclusion: Dissolved air flotation process removes the turbidity, EC and TS effectively; however, it has minimal impact on EC and TS.

Keywords: Dissolved Air Flotation, Hospitals, Recycling, Sludge
Full-Text [PDF 207 kb]   (237 Downloads)    
Article Type: Original Research | Subject: Environmental Health
Received: 2016/12/27 | Accepted: 2017/02/7 | Published: 2017/03/1
* Corresponding Author Address: Health School, Kashan University of Medical Sciences, Pezeshk Boulevard, 5th Kilometer of Kashan-Ravand-Road, Kashan, Iran. Postal Code: 8715973449



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Volume 3, Number 4 (Fall 2016) Back to browse issues page