I would not recommend ...

I would not recommend reusing wastewater for drinking water unless you have tight control on your waste stream. The amount of pharmaceuticals in municipal wastewater that cannot be broken down easily is of concern for water recycling. 

What is the source of your wastewater stream? E.g. abattoir or food processing effluent? Or is it municipal?

Is it economical to recycle? Treatment to drinking water standard would require tertiary treatment in the form of advanced media or membrane filtration and associated disinfectant technology.

If you can control the amount of synthetic chemicals in the waste stream then I could suggest an MBR process followed by mechanical cavitation and disinfection, activated carbon, UV and chlorine dosing. This would produce WHO drinking water quality.