This is due to the low amounts of organic matter in the wastewater, since the hide is cleaned and the proteins are removed during the previous beamhouse process steps.As expected, since only the effluent from the tanning process was analyzed, the amount of total Cr was high, as well as the amount of suspended solids, which is largely a result of collagen fibers. The effluent from tanning showed a strong blue color due to the presence of chromium but the measured turbidity was low.