Degradation of petroleum pollutants in oil-based drilling cuttings using an Fe-based Fenton-like advanced oxidation processes.

Oil-based drilling cuttings (OBDC) contain a large amount of total petroleum hydrocarbon (TPH) pollutants, which are hazardous to the environment. In this study, Fe-activating hydrogen peroxide (Fe/HO), peroxymonosulfate (Fe/PMS), and peroxydisulfate (Fe/PDS) advanced oxidation processes (AOPs) were used to treat OBDC due to the difference in the degradation capacity of TPH caused by the type of free radical generated and effective activation conditions observed for the different oxidants studied. The results showed that the oxidant concentration, Fe dosage, and reaction time in the three AOPs were greatly positively correlated with the TPH removal rate in a certain range.

Removal of total petroleum hydrocarbons from oil-based drilling cuttings by a heat activation persulfate-based process.

Oil-based drilling cuttings (OBDC) are typical hazardous wastes generated during shale gas extraction. In this study, two persulfate-based advanced oxidation processes (AOPs), heat/PMS and heat/PDS, have been used to treat OBDC. The results showed that for the heat/PMS process, within a certain range, the oxidant dosage, temperature, and reaction time were significantly positively correlated with the degree of total petroleum hydrocarbon (TPH) removal.

An investigation of refractory organics in membrane bioreactor effluent following the treatment of landfill leachate by the O/HO and MW/PS processes.

In this study, refractory organics in a membrane bioreactor (MBR) effluent were investigated following the treatment of landfill leachate by the ozone combined hydrogen peroxide (O/HO) and microwave-activated persulfate (MW/PS) processes. The treatment efficiency and the transformation characteristics of refractory organics and reactive oxygen species were determined. It was found that an acidic environment and an increase in the O dosage improved the organic removal efficiency in the O/HO process, and the use of HO improved the treatment efficiency, while excessive HO inhibited it.