The use of rice straw for manganese adsorption from ground water

الملخص EN

The increased spread of rice straw burning process in rural areas has added the level of air pollution.

Therefore, finding suitable methods for using rice straw rather than burning is considered a national aim. Several researcher were concerned about the different uses of rice straw, among them was the use of rice straw as an adsorbent material for the removal of metals from water like manganese which is present in ground water. Manganese is present in high amount in the earth context and that explains its presence in ground water in amounts that exceed the permissible limit for using it as a drinking Water source.

These limits were put according to certain considerations related to technical aspects to limit certain problems such as an unacceptable taste, change in color of clothes or the color of water itself or precipitates in water networks and others.

Therefore, several methods for iron & manganese removal from ground water were developed. In this research rice straw was used as an adsorbing material for manganese as substitute for the high cost already used material.

Practical application of this method will be considered one of the cheapest ways in construction and operation.

The proposed method can be applied in Egyptian villages and societies that depend on ground water containing manganese and don't have the financial abilities or technical experiences in operating and maintenance. All experiments were done on the laboratory using combined water.

Batch analysis method was applied for studying the adsorption process with the control of all the different surrounding circumstances of the experiments.

Different sizes and textures of rice straw were used plus applying different methods of rice straw activation. It was concluded that manganese adsorption process at rice straw surface is affected with the change in temperature, where the higher adsorption level occurred at 25°c temp, it was also found that manganese adsorption efficiency (MAE) increases with the decrease of straw grain size i.

e increased smoothers and the best (MAE) occurred at the surface or rice straw activated with NaOH.