Improvement of Oxygen Releasing Compounds Amended with Modified Oil Sludge

Abstract

The effect of modified oil sludge (MOS), CaO2and bentonite amounts on the performance of oxygen releasing compounds (ORCs) has been investigated. Results showed that MOS was the primary factor to affect the ORCs performance. Increasing the amount of MOS resulted in extension of the lifetime of ORC; instead, decreasing it would obtain relatively large stable oxygen release rate. Moreover, addition of MOS made significant decrease in initial oxygen release rate. Compared with ORCs without MOS, ORCs with 5%, 10%, 15% and 20% MOS had initial oxygen release rates reduced by 15%, 40%, 65% and 65%, respectively. Another characteristic of the MOS was also found. It proved that precipitates generating from oxygen-releasing process, such as calcium and magnesium minerals, could hardly accumulate on the surface of ORC. Addition of MOS reduced the clogging of oxygen diffusion channels caused by the mineral deposition on the surface of ORC; thus, extended the lifetime. The ORC that replaced bentonite with MOS was economical and environment-friendly. One available ORC contained CaO2(30%), MOS (5%), cement (30%) and sand (35%); and its stable oxygen release rate was 0.146 g [O2]/(kg [OR·d) and the lifetime was 187 d.