AI Article Synopsis
- Ultrasonic and ozone treatments enhanced the anaerobic digestion of pharmaceutical waste activated sludge, achieving solubilisation rates of 30.01% and 28.10%, respectively.
- Ultrasonic treatment resulted in greater methane production (249 ml) compared to ozonation (190 ml) after 6 days, indicating higher biodegradability.
- Ozonated sludge released more Cu(2+) into the liquid (6.640 mg L(-1)), while both treatments reduced toxicity in anaerobic digestion, with ultrasonic treatment showing more promise for methane production.
Article Abstract
Ultrasonic and ozone pre-treatment technologies were employed in this study to improve the anaerobic digestion efficiency of pharmaceutical waste activated sludge. The sludge solubilisation achieved 30.01% (150,000 kJ/kg TS) and 28.10% (0.1g O3/g TS) after ultrasonic treatment and ozone treatment. The anaerobic biodegradability after ultrasonic treatment was higher compared to ozonation due to the higher cumulative methane volume observed after 6 days (249 ml vs 190 ml). The ozonated sludge released the highest concentration of Cu(2+) into the liquid phase (6.640 mg L(-1)) compared to 0.530 mg/L for untreated sludge and 0.991 mg/L for sonicated sludge. The acute toxicity test measured by luminescent bacteria showed that anaerobic digestion could degrade toxic compounds and result in a reduction in toxicity. The main mechanism of action led to some differences in the treated sludge exhibiting higher potential for methane production from pharmaceutical waste sludge with ultrasonic treatment.
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| http://dx.doi.org/10.1016/j.biortech.2015.05.079 | DOI Listing |
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