Environmental Health Engineering and Management Journal
Environmental Health Engineering and Management Journal
Environ. Health Eng. Manag.
Medical Sciences
http://ehemj.com
1
admin
2423-3765
2423-4311
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7
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8888
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jalali
1398
10
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gregorian
2020
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1
7
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online
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fulltext
en
Effect of coagulation and sonication on the dissolved air flotation (DAF) process for thickening of biological sludge in wastewater treatment
تخصصي
Special
مقاله اصیل
Original Article
<div style="text-align: justify;"><span class="fontstyle0">Background: </span><span class="fontstyle2">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.</span><br>
<span class="fontstyle0">Methods: </span><span class="fontstyle2">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.</span><br>
<span class="fontstyle0">Results: </span><span class="fontstyle2">The use of ultrasonic waves led to an insignificant increase in the DAF efficiency (</span><span class="fontstyle3">P </span><span class="fontstyle2">> 0.05), however, the application of coagulant significantly increased the thickening efficiency (</span><span class="fontstyle3">P </span><span class="fontstyle2">< 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.</span><br>
<span class="fontstyle0">Conclusion: </span><span class="fontstyle2">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.</span></div>
Ultrasonic waves, Industrial effluent, Dissolved air flotation, Sonication
59
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http://ehemj.com/browse.php?a_code=A-10-1-162&slc_lang=en&sid=1
Ali
Atamaleki
Aliatamaleki69@yahoo.com
10031947532846006169
10031947532846006169
No
Department of Environmental Health Engineering, School of Public Health, Kashan University of Medical Sciences, Kashan, Iran
Mohammad Bagher
Miranzadeh
miranzadehm@ymail.com
10031947532846006170
10031947532846006170
No
Department of Environmental Health Engineering, School of Public Health, Kashan University of Medical Sciences, Kashan, Iran
Gholam Reza
Mostafaii
mostafai_gr@kaums.ac.ir
10031947532846006171
10031947532846006171
Yes
Corresponding author:Department of Environmental Health Engineering, School of Public Health, Kashan University of Medical Sciences, Kashan, Iran
Hosein
Akbari
akbari_h@kaums.ac.ir
10031947532846006172
10031947532846006172
No
Biostatistics and Public Health Department, Faculty of Health, Kashan University of Medical Sciences, Kashan, Iran
Leila
Iranshahi
Iranshahi-l@kaums.ac.ir
10031947532846006173
10031947532846006173
No
Department of Environmental Health Engineering, School of Public Health, Kashan University of Medical Sciences, Kashan, Iran
Farshid
Ghanbari
farshidbeat@yahoo.com
10031947532846006174
10031947532846006174
No
Abadan Faculty of Medical Sciences, Abadan, Iran
Atieh
Salem
atiehsalem70@gmail.com
10031947532846006175
10031947532846006175
No
Department of Environmental Health Engineering, School of Public Health, Kashan University of Medical Sciences, Kashan, Iran