Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7702667 | Ultrasonics Sonochemistry | 2018 | 45 Pages |
Abstract
High frequency ultrasonic radiation technology was developed as a novel and efficient means of regenerating spent biological activated carbon (BAC) used in drinking water treatment plants (DWTPs). The results of this study indicated that high frequency ultrasonic treatment could recover the spent BAC, to some extent, with the following optimal conditions: a frequency of 400â¯kHz, sonication power of 60â¯W, water temperature of 30â¯Â°C, and sonication time of 6â¯min. Under the above conditions, the iodine value increased from 300â¯mg/g to 409â¯mg/g, the volume of total pores and micropores increased from 0.2600â¯cm3/g and 0.1779â¯cm3/g to 0.3560â¯cm3/g and 0.2662â¯cm3/g, respectively; the specific surface area of micropores and the mean pore diameter expanded from 361.15â¯m2/g and 2.0975â¯nm to 449.92â¯m2/g and 2.1268â¯nm, respectively. The biological activity increased from 0.0297â¯mgO2/gC·h to 0.0521â¯mgO2/gC·h, while the biomass decreased from 203â¯nmolP/gC to 180â¯nmolP/gC. The results of high throughput 16S rRNA gene amplicon sequencing showed that microorganisms such as Clostridia and Nitrospira were markedly decreased due to high frequency ultrasound. The method used in this study caused the inhibition of certain carbon-attached microbials resulting in a negative effect on the removal rate of ammonia-N during the initial stage of the long-term reuse operation. The removal of UV254 and atrazine were restored from 8.1% and 55% to 21% and 76%, respectively.
Related Topics
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Authors
Zhehao Sun, Cheng Liu, Zhen Cao, Wei Chen,