Simultaneously Recovering High-Purity Chromium and Removing Organic Pollutants from Tannery Effluent

Figure 7

Scanning electron micrographs showing the cross section (100x and 400x). (a) Tanned with chrome tanning agent prepared from the untreated chromium waste liquid. (b) Tanned with chrome tanning agent prepared from the chromium waste liquid treated with enzyme. (c) Tanned with chrome tanning agent prepared from the chromium waste liquid treated with Fenton. (d) Tanned with commercial chromium powder.

(a)

(b)

(c)

(d)