Selenium transport behavior

Figure 92 Typical transient current pulses for holes in amorphous selenium (see Ref. 422a), illustrating the effect of temperature on the degree of the dispersion in carrier transport. Left linear current (i) and time (t) axes right normalized values in logarithmic axes log(i/io) vs. log(t/t0). The arrows indicate the position of the knee dividing the two regimes of logarithmic dependence. Similar behavior can be observed in organic solids (see e.g. Ref. 422b).

Batch ELM Extraction of Selenium. A series of batch extraction experiments were carried out to assess the feasibility of an ELM process for the removal of selenium from refinery wastewater streams. To do this we developed emulsion formulations and evaluated these formulations for the capability of reducing the aqueous phase selenium concentration below 0.05 mg/L. Next, we carried out experiments to evaluate the effect of competition between the two oxidation states, the effect of total selenium concentration of the extraction behavior, the effect of external phase pH on the transport rate, and the effect of competing anions (like sulfate) on the extraction efficiency and kinetics. 

---