| Abstrakt: |
In the group of conventional methods for separation of heavy metals from water resources rae oxydadion/precipitation and concentration/precipitation. Adsorption has many advantages in controlling polluted waters, these are as follow: investments are insufficient, simple project, there are no side effects from toxic substances, and superior elimination of heavy metals. The rise husk used as a biosorbent shows very good facilities for separation of alarge number of heavy metals from polluted waters especially metals which are eliminated very difficult throught other methods such as Cr 6+. Using the rise husk as a na tural biosorbent for alimination of Cr6+ ions, there are reached very good results, with a high coeficient of bioso rption but it is not enough yet, therefore it isnecessary to do a modification of the biorbent in order to rise the biosorption coefficient. The rise husk undergoes the process of oxydation, and a result of this comes to the change of the morphology of biosorbent surface depending on the reproductivity of the structure creating in this way spaces with a regular orientation which represent a structure in the form of a sphere well organized, rising the active surface of biosorbent and makes easier the adsorption of metal ions Cr6+ withi n the biosorbetn. Carbonisation of the rise husk is made on 400 C. By modificating the rise husk apparan tely rises the biosorption coefficient, the biosorption time is shortened, and the amount of bisorbent is lowere d as well. [ABSTRACT FROM AUTHOR] |
