Effect of coagulation and sonication on the dissolved air flotation (DAF) process for thickening of biological sludge in wastewater treatment
Journal: Environmental Health Engineering and Management Journal (Vol.7, No. 1)Publication Date: 2020-04-12
Authors : Ali Atamaleki Mohammad Bagher Miranzadeh Gholam Reza Mostafaii Hosein Akbari Leila Iranshahi Farshid Ghanbari Atieh Salem;
Page : 59-65
Keywords : Ultrasonic waves; Industrial effluent; Dissolved air flotation; Sonication;
- Effect of coagulation and sonication on the dissolved air flotation (DAF) process for thickening of biological sludge in wastewater treatment
- Biological Treatment of Wastewater Using Activated Sludge Process and Sequential Batch Reactor Process - A Review
- Biological Treatment of Wastewater for Institutions Using Activated Sludge Process
- Biological Treatment of Edible Oil Refinery Wastewater using Activated Sludge Process and Sequencing Batch Reactors - A Review
- Investigation, biokinetic calculation, and modelling of a real combined industrial wastewater biological treatment process by activated sludge models
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.
Other Latest Articles
- Bioremediation of phenanthrene-polluted soil using Bacillus kochii AHV-KH14 as a halo-tolerant strain isolated from compost
- A new magnetic bio-sorbent for arsenate removal from the contaminated water: Characterization, isotherms, and kinetics
- Comparison of heavy metals contamination and ecological risk between soils enriched with compost and chemical fertilizers in the North of Iran and ecological risk assessment
- GUI BASED PREDICTION OF CRIME RATE USING MACHINE LEARNING APPROACH
- COMPARATIVE ANALYSIS OF ALGORITHMS USED IN DEEP LEARNING
Last modified: 2020-04-05 15:47:32