Journal of Water and Wastewater; Ab va Fazilab (in persian)

Journal of Water and Wastewater; Ab va Fazilab (in persian)

Biodegradation of Nicotine Using Aerobic Granules in Sequence Batch Reactor

Document Type : Research Paper

Authors
Mohadeseh Shahriari 1
Gholam Khayati 2
1 PhD. Student of Chemical Engineering, Dept. of Chemical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran
2 Assoc. Prof., Dept. of Chemical Engineering, Faculty of Engineering, University of Guilan, Rasht, Iran
10.22093/wwj.2024.445899.3403
Abstract
Nicotine is a substance widely consumed globally as a drug. Due to its toxic nature and high solubility in water, it poses a significant threat to water quality. This study aimed to investigate the feasibility of forming aerobic granules from nicotine-acclimated activated sludge and examine the capability of these aerobic granules for nicotine degradation. The acclimation process led to the complete degradation of 500 mg/L of nicotine. Ultimately, the effluent concentrations of nicotine and COD were 3.4 mg/L and 53 mg/L, respectively, with the system achieving removal efficiencies of 99.14% for nicotine and 89.16% for COD. Additionally, a 6-hour cycle (1 minute filling, 10-1 minute settling, 1 minute discharge, and the remaining time for aeration) resulted in the formation of granules with diameters ranging from 2-4 millimeters and a round shape, exhibiting high strength. After 60 days, the SVI30/SVI5 ratio reached 1.0. The granular sludge showed higher extracellular polymeric substances and protein content compared to flocculent sludge, with a protein-to-polysaccharide ratio of 2.64. Furthermore, to assess the aerobic granules' ability to degrade and tolerate nicotine toxicity, the nicotine concentration was increased to twice the adapted concentration (1000 mg/L), resulting in a COD removal efficiency of 90.2% in the aerobic granular sequencing batch reactor.
Keywords
Acclimated Activated Sludge
Aerobic Granules
Nicotine Biodegradation
Tobacco Waste
Sequence Batch Reactor
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Journal of Water and Wastewater; Ab va Fazilab (in persian)
Volume 35, Issue 2 - Serial Number 151
July and August 2024
Pages 40-52