Abstract:Abstract-Several factors can affect performance of an ultrasound system such as quality of excitation signal and ultrasound transducer behaviour. Nonlinearity of piezoelectric ultrasound transducers is a key determinant in designing a proper driving power supply. Although, the nonlinearity of piezoelectric transducer impedance has been discussed in different literatures, the trend of the nonlinearity at different frequencies with respect to excitation voltage variations has not been clearly investigated in pra… Show more
“…An increase in the input power results in higher power density and consequently faster treatment (Lifka et al , 2003; Mahvi, 2009). In order to achieve efficient energy conversion performance from a piezoelectric transducer as a main component of the ultrasound system, it is important to excite the transducer by a high‐quality signal and at its main resonant frequency (Ghasemi et al , 2017). However, the resonant frequency of the transducer can be easily changed during its operation due to environmental and structural changes.…”
Treatment of wastewater using ultrasound systems is gaining increasing interest due to its effectiveness for a wide range of pollutants and no secondary pollutant production. This paper proposes two ultrasound systems operating at different ranges of electrical power and frequency developed to remove toxic polycyclic aromatic hydrocarbon (PAH) compounds in wastewater. Both light molecular weight (LMW) and high molecular weight (HMW) compounds were degraded using the developed systems. However, HMW compounds were more affected. The experimental results revealed that treatment at a high power level is not always a proper approach for a large reduction of PAH compounds. Whereas treatment at higher frequencies and lower power can be a suitable alternative to enhance the PAHs removal rate and the system energy efficiency and reduce losses. Therefore, a dual-mode ultrasound system with adjustable operating frequency and power is a promising approach for the treatment of industrial wastewater containing toxic PAH compounds.
“…An increase in the input power results in higher power density and consequently faster treatment (Lifka et al , 2003; Mahvi, 2009). In order to achieve efficient energy conversion performance from a piezoelectric transducer as a main component of the ultrasound system, it is important to excite the transducer by a high‐quality signal and at its main resonant frequency (Ghasemi et al , 2017). However, the resonant frequency of the transducer can be easily changed during its operation due to environmental and structural changes.…”
Treatment of wastewater using ultrasound systems is gaining increasing interest due to its effectiveness for a wide range of pollutants and no secondary pollutant production. This paper proposes two ultrasound systems operating at different ranges of electrical power and frequency developed to remove toxic polycyclic aromatic hydrocarbon (PAH) compounds in wastewater. Both light molecular weight (LMW) and high molecular weight (HMW) compounds were degraded using the developed systems. However, HMW compounds were more affected. The experimental results revealed that treatment at a high power level is not always a proper approach for a large reduction of PAH compounds. Whereas treatment at higher frequencies and lower power can be a suitable alternative to enhance the PAHs removal rate and the system energy efficiency and reduce losses. Therefore, a dual-mode ultrasound system with adjustable operating frequency and power is a promising approach for the treatment of industrial wastewater containing toxic PAH compounds.
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