The Oily sludge with high water content (OS) was dewatered, modified and converted into solid fuel by a novel chemical conditioner (OSO-101). The effect of OSO-101 dosage on the dewaterability of OS was studied, showing that OSO-101 dosage of 15% (wt.) could achieve the best dewaterability efficiency of OS (98.18%). Meanwhile, compared with some conventional conditioners, OSO-101 developed by our team was more effective in improving OS dewaterability efficiency. And OSO-101 may have free radical reaction, polar reaction and redox reaction with petroleum hydrocarbons in OS, thereby polymerizing and forming condensed solid structures. The calorific value change of OS after conditioning, heavy metal content and dioxins content of fly ash leached from incinerated product were measured for resource analysis and environmental assessment. Results showed that the resultant OS fuel blocks had extremely low content of heavy metals, dioxins and other toxic and hazardous substances leached from fly ash, thereby no secondary treatment and fully meeting environmental protection emission standards. Additionally, OSO-101 had certain economic rationality, and could effectively recover the calorific value contained in OS. This research is expected to provide new insights for efficient dewaterability and modification of OS, as well as subsequent resource utilization and harmless treatment, bringing potential environmental and economic benefits.
The degradation of phenol by pulsed discharge plasma above liquid surface (APDP) and under liquid surface (UPDP) was compared. The effects of discharge voltage, discharge distance, initial solution conductivity and initial pH on the phenol removal were studied. It was concluded that the phenol removal increases with increasing discharge voltage and with decreasing discharge distance in both APDP and UPDP system. The increase of the initial solution’s conductivity has a positive effect in the APDP system but has a negative effect in the UPDP system. In addition, the alkaline condition is conducive to the degradation of phenol in the APDP system, while acidic condition is conducive in the UPDP system. Free radical quenching experiments revealed that •O2- has an important influence on the degradation of phenol in the APDP system, while •OH plays a key role in the UPDP system. This paper verifies the differences of the two discharge methods in terms of phenol removal.
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