Discharge of industrial wastewater have negative effects on environment, attention to treatment of those wastewaters are very important. Due to the spread of using starch in different industries and nearly same features of their wastewaters different methods for treatment such as physical, chemical and biological methods are used in treatment. The goal of this research is assessment of electrochemical and dissolved air flotation treatment on artificial starch industries’ wastewater with base of wheat flour by discontinuous reactor. Electrochemical treatment includes processes of electro Fenton and electrocoagulation were considered. According to results of primary tests, pH, space between electrodes, current density, time, temperature, hydrogen peroxide and influent COD have effects on electrochemical treatment. Results showed the percent by volume of hydrogen peroxide, influent COD and time of reaction respectively are the most important factors and COD and pH are the least important factors in electrochemical treatment. According the results of response surface models. the optimal conditions of electro Fenton include space between electrodes, pH, current density, time, the percent by volume of hydrogen proxy, temperature are respectively 1 centimeter, 8.5, 36 mA/cm^2, 30 minute, 0.77 %, 30 centigrade and the removal efficiency on those conditions have been achieved 92%.Electrocoagulation process in optimal conditions, include space between electrodes, pH, current density, time, temperature are respectively 1 centimeter, 8.9, 33 mA/cm^2, 30 minutte,8 centigrade and the removal efficiency on those conditions have been achieved 88%. In the floating with dissolved air process, the performance two coagulant substance: Ferric Chloride, poly aluminum chloride in removal of COD were assessed. Recycle ratio, pH, coagulant dose and influent COD were assessed. Design experiment was completed by response surface method. Results showed that flotation with ferric chloride in optimal condition includes 20% recycle ratio, pH 7.8, 50 mg/l ferric chloride, COD removal efficiency have been 50%. pH and COD respectively are the most important factors and recycle ratio has less important effect on flotation process. Results showed that flotation with poly Aluminum chloride in optimal condition includes 20% recycle ratio, pH 9, 50 mg/l ferric chloride, COD removal efficiency have been 60%. COD and pH respectively are the most important factors and the dose of poly aluminum chloride has less important effect on flotation process. Results showed that electrochemical process has better performance than Dissolved air flotation. In electrochemical processes, electro Fenton with anaerobic biological process is the effective method for initial COD removal. But, electro Fenton process have some problem in management and residual hydrogen peroxide removal. Therefore, application of electrocoagulation with attention to acceptable efficiency in COD removal and economic consideration is better than other process which have been studied.