... sulfate FeSO4 (7H2O - 90%, titanium dioxide content of p content of TiO2 than 0.75%, water content than 0. ... the flocculant, ferrous sulfate could replace polyaluminium, alkali, polyblend of iron and aluminium type, aluminium, hexahydrated, etc. 2, as precipitation ... as biochemical system of microbes in iron, and improve the system of nutrition, thus ensuring the activity of microorganism and improve ...