Abstract
We examined the effects of ultrasound (U), Fenton oxidation (F), and ultrasound coupled with Fenton oxidation (U + F) pre-treatments (prior to anaerobic digestion) on the elimination of odorous compounds. The results demonstrated that U promoted odor release, while the coupled treatment and F alone decreased odor release. After 20-min treatments, the concentration of dissolved sulfide (S2-) under the coupled U + F treatment declined from 17.4 mg/L to 8.1 mg/L, decreasing by more than 50% and 34%, respectively, for U alone and F alone. In addition, the dissolved sulfate (SO42-) concentration under couple U + F treatment significantly increased in sewage sludge from 200 mg/L to 390.6 mg/L, up 95.3% compared to U alone and 5% compared to F alone. This illustrates the oxidation process from S2- to SO42-. Throughout experimentation, SO42- was odorless and stable, highlighting the mechanism of odor control. Thus, combining U and F into a single coupled treatment proved to be a better alternative pretreatment for controlling sludge odor compared to the U and F alone and can effectively decrease potential odor release. (C) 2016 Published by Elsevier Ltd.
Original language | English |
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Pages (from-to) | 124-128 |
Number of pages | 5 |
Journal | Journal of Environmental Management |
Volume | 181 |
DOIs | |
Publication status | Published - 1 Oct 2016 |
Externally published | Yes |
Keywords
- Waste water treatment plant (WWTP)
- Sewage sludge
- Ultrasound coupled with Fenton oxidation
- Odor control
- WASTE ACTIVATED-SLUDGE
- WATER TREATMENT-PLANT
- ANAEROBIC-DIGESTION
- PRETREATMENT
- REMOVAL
- CARBON
- BIOFILTRATION
- PERFORMANCE
- IMPROVEMENT
- EMISSIONS