Study of the Effect of Steam Injection on Crude Oil Displacement Yield from an Oil Contaminated Soil Bed

A substantial oil recovery of different packed soil samples has been obtained by the removal of light and heavy crude oils, with different American Petroleum Institute (API) gravity indexes. Steam and water injection methods are applied to different soil particle size samples (core size) and different types of oil gravity. The amount of oil removed increases with increasing the core size (permeability and porosity). For 0.5 mm core size and light oil (35-API), oil recovery reaches 98 wt% using superheated steam and 96 wt% using saturated steam. For heavy oil (24-API), oil recovery reaches 91 wt% using superheated steam and 90 wt% using saturated steam. For 0.2mm core size and heavy oil (24-API), oil recovery reaches 85% using superheated steam and 74 wt% using saturated steam. These results suggest that oil recovery increases as cell temperature and core size (permeability and porosity) increase, and the addition of surfactants to steam increased oil recovery amounting to around 3 wt%. Water injection resulted in low oil recovery, and the maximum oil recovery is 5 wt%, and 20 wt% using cold and hot water, respectively

Improvement of Manure Adsorption Capacity for Cobalt Removal by Chemical Treatment with Citric Acid

This paper focuses on how the surface chemical groups of sheep manure affect the adsorption capacity of cobalt ions. Improvement in cobalt ions uptake onto sheep manure was achieved successfully by introducing more carboxylic functional groups into its surface due to citric acid treatment. According to Langmuir model, cobalt ions uptake was increased from 22.88 mg/g for dried sheep manure (D-SM) to 37.45 mg/g when D-SM was treated with 0.6 M citric acid (C-SM). Point of zero charge and cation exchange capacity were determined and found as 4.3 and 82 meq/100g for D-SM while it was found as 3.4 and 281 meq/100g for C-SM, respectively. The effects of process parameters such as solution pH, initial concentration of cobalt ions, contact time and concentration of citric acid on the uptake of cobalt ions were also investigated. Langmuir and Freundlich models were applied to the experimental data. Both models fitted quite well with the experimental data