Effect of coagulation and sonication on the dissolved air flotation (DAF) process for thickening of biological sludge in wastewater treatment

Journal Title: Environmental Health Engineering and Management Journal - Year 2020, Vol 7, Issue 1

Abstract

Background: Dissolved air floatation (DAF) is one of the methods has been used for the sludge thickening in wastewater treatment plants. This study aimed to investigate the effects of coagulation and sonication processes as additional configurations on the efficiency of a lab-scale DAF process for thickening of the biological sludge of an industrial wastewater treatment plant in Kashan, Iran. Methods: The required amounts of sludge samples were collected from a wastewater treatment plant and kept at temperature of 4°C. Variables, such as pressure (3, 5, and 7 atm), flotation time (5 and 10 minutes), ultrasonic irradiation power (0, 75, and 150 W), and presence/absence of Fe-based coagulant were considered on a sequencing batch reactor (SBR) included coagulation, flotation, and sonication processes, respectively. Results: The use of ultrasonic waves led to an insignificant increase in the DAF efficiency (P > 0.05), however, the application of coagulant significantly increased the thickening efficiency (P < 0.05). The maximum efficiency of the process was achieved at flotation time of 5 min, pressure of 3 atm, and sonication power of 75 W. Conclusion: According to the results, DAF has a proper efficiency for thickening of biological sludge. Coagulation compared to sonication has a greater effect on the efficiency of the process.

Authors and Affiliations

Ali Atamaleki , Mohammad Bagher Miranzadeh , Gholam Reza Mostafaii , Hosein Akbari , Leila Iranshahi, Farshid Ghanbari , Atieh Salem

Keywords

Related Articles

Amoxicillin degradation with electro-persulfate combined with H2O2 from aqueous solution using response surface methodology

Background: Discharging wastewaters containing antibiotic into the environment causes some adverse effects on the human health and other organisms. The present study investigated the efficiency of electropersulfate com...

Linking ground-satellite observations with HYSPLIT Back trajectory modeling to identify dust sources affecting Western Iran: A case study in Lorestan province

Background: This study combined ground and satellite observations with the results of HYSPLIT model to identify the origin, transport, and deposition of sand and dust storms (SDSs) affecting Western Iran. Methods: Fiel...

Study of the effectiveness of the third generation polyamideamine and polypropylene imine dendrimers in removal of reactive blue 19 dye from aqueous solutions

Background: Dye and colored materials cause health risks in water and therefore, must be removed from water supplies and wastewater. The aim of this study was to evaluate the effectiveness of the third generation poly(am...

Detection to trace aluminum ion of pharmaceutical wastewater using synthesis of Schiff-based chemosensor

Background: The aim of this research was to develop a fluorogenic sensor for Al3 + ions, which have been identified as a possible food and drinking water pollutant by the WHO and considered to be harmful to human health....

Effect of mineral nanoparticles obtained from thermal spring water on COVID-19

Background: Coronavirus disease 2019 (COVID-19) is presently a life-threatening condition, and despite of multiple attempts, no functional method has been introduced against this pandemic problem yet. In this study, fo...

Download PDF file
  • EP ID EP678626
  • DOI 10.34172/EHEM.2020.08
  • Views 198
  • Downloads 0

How To Cite

Ali Atamaleki, Mohammad Bagher Miranzadeh, Gholam Reza Mostafaii, Hosein Akbari, Leila Iranshahi, Farshid Ghanbari, Atieh Salem (2020). Effect of coagulation and sonication on the dissolved air flotation (DAF) process for thickening of biological sludge in wastewater treatment. Environmental Health Engineering and Management Journal, 7(1), -. https://europub.co.uk/articles/-A-678626