*3.3.4. Effect of temperature*

As previously mentioned (see Section 2, **Figure 2**), temperature also plays an important role on the biosorption processes, as well as on all biological and physico-chemical processes. The biosorption of Cr(III), Cu(II) and Zn(II) by wine-processing waste sludge (WPWS) in a ternary system was found to be significantly affected by temperature. At normal conditions, the biosorption of these three metals in a mixture by WPWS followed the trend Cr(III) > Cu(II) > Zn(II). However, when the temperature decreases to 10°C, the biosorption of Cr(III) was inferior than Cu(II) [50].
