Response surface methodology for the optimization of the ultrasonic-assisted rhamnolipid treatment of oily sludge |
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Authors: | Chong Liu Xuefei Hu Qi Xu Simin Zhang Pengyan Zhang Huanliang Guo Yongjun You Zhengjie Liu |
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Institution: | 1. State Key Laboratory of Heavy Oil Processing, Beijing Key Laboratory of Oil & Gas Pollution Control, Institute of Chemical Engineering and Environment, China University of Petroleum-Beijing, Beijing 102249, PR China;2. Institute of Water Resource and Architectural Engineering, Tarim University, Alar, Xinjiang 843300, PR China;3. Shenzhen Shenshui Ecological & Environmental Technology Co., Ltd., Shenzhen 518000, PR China |
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Abstract: | This study investigates the recovery of oily sludge using ultrasound-assisted rhamnolipids and uses oil recovery yield as an evaluation index. The Box–Behnken response surface method was employed to investigate the individual and interactive effects of four different operating factors: frequency, dosage, liquid–solid ratio, and stirring speed. The model optimization results showed that the order of degree of influence of these four factors is frequency > liquid–solid ratio > dosage > stirring speed. The mathematical model predicted the highest oil recovery yield as 92.27%, which was highly accurate (in the 95% confidence interval) as from the experimental results, the highest oil recovery yield was 89.95% under optimal reaction conditions (frequency = 25.58 kHz, dosage = 150.45 mg/L, liquid–solid ratio = 4.1:1 mL/g, and stirring speed = 407 rpm). Thus, the deviation from the prediction model was only 2.32%, indicating that this method provides a theoretical basis for the treatment of oily sludge and can be implemented for practical application in Huaidong in the Xinjiang Province. |
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Keywords: | Rhamnolipid Ultrasound Response surface Oily sludge Biosurfactant CMC"} {"#name":"keyword" "$":{"id":"k0035"} "$$":[{"#name":"text" "_":"critical micelle concentration CV"} {"#name":"keyword" "$":{"id":"k0045"} "$$":[{"#name":"text" "_":"coefficient of variance IFT"} {"#name":"keyword" "$":{"id":"k0055"} "$$":[{"#name":"text" "_":"interfacial tension PHC"} {"#name":"keyword" "$":{"id":"k0065"} "$$":[{"#name":"text" "_":"petroleum hydrocarbon RH"} {"#name":"keyword" "$":{"id":"k0075"} "$$":[{"#name":"text" "_":"rhamnolipid SARA"} {"#name":"keyword" "$":{"id":"k0085"} "$$":[{"#name":"text" "_":"saturates aromatics resins and asphaltene US"} {"#name":"keyword" "$":{"id":"k0095"} "$$":[{"#name":"text" "_":"ultrasonic C I "} {"#name":"keyword" "$":{"id":"k0105"} "$$":[{"#name":"text" "_":"confidence interval |
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