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| Q. |
Which of the toxic heavy metals is found in modern tannery industries? |
| A. | Nickel |
| B. | Zine |
| C. | Chromium |
| D. | Lead |
| Answer» C. Chromium | |
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Explanation: Chromium is mainly found in waste from the chrome tanning process; it occurs as part of the retanning system and is displaced from leathers during retanning and dyeing processes. This chrome is discharged from processes in soluble form; however, when mixed with tannery waste waters from other processes (especially if proteins are present), the reaction is very rapid. Precipitates are formed, mainly proteinchrome, which add to sludge generation. |
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