A study of the changes of water quality before and after utilizing low frequency and low power ultrasound treat algae

2011 ◽  
Author(s):  
Jiangping Li ◽  
Yejing Qiu ◽  
Hai Long ◽  
Wei Wu ◽  
Chen Song
Keyword(s):  
Water Quality ◽  
Low Power ◽  
Low Frequency ◽  
Power Ultrasound ◽  
Before And After

scholarly journals Transdermal Delivery of Enfuvirtide in a Porcine Model Using a Low-Frequency, Low-Power Ultrasound Transducer Patch

2019 ◽  
Vol 45 (2) ◽  
pp. 513-525 ◽  
Author(s):  
Kevin A. Snook ◽  
Robert Van Ess ◽  
Jacob R. Werner ◽  
Ryan S. Clement ◽  
Olga M. Ocon-Grove ◽  
...  
Keyword(s):  
Low Power ◽  
Transdermal Delivery ◽  
Porcine Model ◽  
Low Frequency ◽  
Ultrasound Transducer ◽  
Power Ultrasound

The Application of Low-Frequency and Low-Power Ultrasound Algae Removal Technology in Pengxi River in Three Gorges Area

2011 ◽  
Vol 295-297 ◽  
pp. 1852-1855
Author(s):  
Zhi Zhang ◽  
Jing Ming Han ◽  
Ming Kai Cai ◽  
Gong Duan Fan ◽  
Jing Luo ◽  
...  
Keyword(s):  
Low Power ◽  
Low Frequency ◽  
Three Gorges ◽  
Optimal Frequency ◽  
Power Ultrasound ◽  
Three Gorges Area ◽  
First Order ◽  
Algae Removal ◽  
Ultrasonic Time ◽  
Removal Technology

Three ultrasonic transmitters of single power of 50W, frequency of 20~50 kHz,60~100 kHz and 100~150 kHz were used to remove bloom algae of Pengxi River in Three Gorges Area. The results show that algae are removed in some certain degree by 5 min’s irradiation of low-frequency and low-power ultrasound, the process follows the first order reaction, and the rate constant is 0.0384 min-1. In this study, the optimal ultrasonic time is 5 min, the removal of algae density and Chlorophyll-a are about 15% and 7%, the optimal frequency are 20~50 kHz and 100~150 kHz respectively.

scholarly journals Integrated Hydraulic Modelling, Water Quality Modelling and Habitat Assessment for Sustainable Water Management: A Case Study of the Anyang-Cheon Stream, Korea

2021 ◽  
Vol 13 (8) ◽  
pp. 4330
Author(s):  
Byungwoong Choi ◽  
Seung Se Choi
Keyword(s):  
Water Management ◽  
Water Quality ◽  
Water Quality Index ◽  
Habitat Suitability ◽  
Quality Index ◽  
Stream Restoration ◽  
Restoration Project ◽  
Before And After ◽  
Habitat Simulation ◽  
Canadian Council

Recent ecological stream restoration projects have focused on expanding the water-friendly space of streams, promoting the health of aquatic ecosystems, and restoring various habitats, which raise the need for relevant research. Applying integrated environmental analysis, this study quantifies the change in hydraulic characteristics before and after the restoration projects through physical habitat simulation and links the results of physical impacts to estimate benefits of increase in water quality and aquatic ecosystem health due to the implementation of the project. For this, the study area is a 3.3 km long reach of the Anyang-cheon Stream, Korea. Field monitoring revealed that five fish species are dominant and sub-dominant, and account for 76% of the total fish community. To assess the change of before and after ecological stream restoration project, the River2D and Coastal Modelling System (CMS)-Flow 2D models were used for hydraulic and water quality simulations, respectively. For the habitat simulation, the HSI (Habitat Suitability Index) model was used. In addition, the Canadian Council of Ministers of the Environment Water Quality Index (CCME WQI) was used to calculate changes in water quality index and to examine changes in habitat areas with an integrated quantitative index, the methodology of Zingraff-Hamed et al. was adopted. It was found that the ecological stream restoration project significantly increased for the eco-friendly area. In addition, the changes in water quality and habitat suitability grades before the ecological river restoration project were improved to two stages and one stage, respectively. This study applied the integrated analytical framework as a policy/project assessment tool and the results of this study will be useful for the integrated water management policy.

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