BACKGROUND: In recent years, design of experiments (DOE) is used for removing pollutant from waste water by nano adsorbent. Some methods are Taguchi, response surface methodology (RSM) and factorial design. The aim of this paper is to review different used methods of DOE in removing pollutant to suggest some notations to scholars.
METHODS: The reviewed papers were searched in Google scholar, Scopus, and Web of Science randomly and categorized based on DOE methods.
RESULTS: Number of factors and responses in DOE for removing pollutants from wastewater are between 2-6 and 1-4, respectively. There are several computer software programs that provide simple use of these methods, such as Qualitek, Design Expert, Minitab, R and Matlab Programming. All models have coefficient of determination R-sq more than 0.9.
CONCLUSION: All the mentioned methods are appropriate because of high R-sq value. Since the largest number of runs are used in RSM, it is not suitable for the experiments which are conducted by expensive materials and process. Furthermore, Design Expert and Minitab are the most popular software used by scholars in DOE methods for removal of pollutant.