Canisters are important because they prevent fuel evaporation go in the air by adsorbing them onsome sorbents, mostly activated Carbon. Different inventions and studies were done on this field toimprove canisters structures and performance. Some important ones of them are collected and reviewedin this work, to get insight to the researchers in this area.

Industrial wastewater because of high pollution, access to the water in the unit etc. should be refined. One of the methods of industrial effluents electric coagulation method is based on the electronic exchange, flocculation and flotation to remove the contaminants. In this study, this method was used for waste water treatment polymer unit. is the majority of infections in this unit consisting of TSS, TDS and COD. In this study, two units were built batch and continuous electrical coagulation. The unit was disconnected and factors affecting the process were examined. The factors studied current density, time, pH, number and spacing of the electrodes were already identified using design of experiments conducted and data were analyzed. The results of analysis of variance showed that the operating current density, the number of electrodes and pH affect the response as the most important factors are that the current density is considered as the most effective factor. Time parameters and the electrodes are less effective compared to the original parameters are listed. The results showed that using electric coagulation as a pretreatment method, along with other methods can be carried out as well as industrial wastewater treatment process

Keywords:

Wastewater treatment , design expert , optimization , design of experiments , response surfacemethod