Guolin Jing

Treatment of oily sludge by advanced oxidation process

For treating oily sludge, wet peroxide oxidation (WPO) and catalytic wet oxidation (CWO) were investigated. The CWO experiment was carried out in a 0.5xa0L batch reactor using FeCl3 as catalyst. By using WPO, the effects of reaction parameters such as residence time, temperature, H2O2 excess, and initial COD were investigated. The results demonstrated that >80xa0% chemical oxygen demand (COD) was removed by CWO and >90xa0% COD was removed by WPO. Significantly, more of COD could be removed from the oily sludge by adding H2O2 in small doses. In conclusion, WPO was much more effective in the removal of organic compounds from oily sludge.

Pretreatment of oily sludge by wet air oxidation

The pretreatment of oily sludge by wet air oxidation (WAO) technique was investigated. The effect of reaction parameters such as temperature, initial chemical oxygen demand (COD), residence time, catalyst type, concentration of catalyst and O2 excess on the COD removal rate was investigated. The results showed that oily sludge had a high COD removal rate by WAO. Adding the catalyst significantly improved the COD removal rate. Homogeneous catalyst, Mn2+, showed a significant removal rate for pollutants. The COD removal rate was 96·8% by catalytic wet air oxidation (CWAO) over Mn2+ catalyst. The results indicated that the CWAO was an effective pretreatment method for the oily sludge.

Analysis and Inhibition of Scale Accumulation for a Producing Well in the Daqing Oilfield

The mechanism and main type of the scale in producing well of the eighth plant of the Daqing oilfield was analyzed. The experimental results show that the main type deposition is calcium carbonate. The scale inhibition efficiency of several common inhibitors and the remixed inhibitor was investigated. The effects of the temperature on the scale inhibition efficiency were investigated as well. It shows that the remixed inhibitor could have excellent inhibition efficiency.

Wet Air Oxidation of Oily Sludge

The article is inclined to report experimental results performed in a batch reactor on the wet air oxidation of oily sludge. It is shown that increasing the reaction temperature can improve chemical oxygen demand (COD) removal significantly, increasing O2 excess (OE), initial concentration of oily sludge and prolonging reaction time can help to improve the chemical oxygen demand (COD) removal. COD removal is 96.15% under the optimal condition. It is concluded that wet air oxidation is an effective process for removing organic compounds from oily sludge. The intermediate product such as acetic acid (CH3COOH), carbon monoxide (CO), and the final product such as carbon dioxide (CO2) is analyzed by liquid chromatography and gas chromatography in the experiment.

Removing Organic Compounds from Oily Sludge

Oily sludge is one of the largest categories of wastes generated by oil industry petroleum production and petroleum refinery plant. Its release to the environment is strictly controlled and it is classified as priority environmental pollutants by the US Environmental Protection Agency. So, it must be treated. Wet peroxide oxidation (WPO) and catalytic wet oxidation (CWO) of oily sludge were investigated. The result indicated that homogenous catalyst (NaHCO3) showed effective removal for pollutants. WPO was an effective process for removing organic compounds from oily sludge. This paper may supply a new method of treating oily sludge for the oilfield.