Treatment consists of the following four steps: 1) waste water and reaction cell by three compartment trough, trough full of gravity after each compartment into the next compartment tank, in the desulfurization wastewater into the first compartment tank while adding a certain amount of lime slurry By continuously stirring, the pH was raised to 9.0 from about 5.5 or more. 2) the use of heavy metals settling agents, heavy metals precipitate Ca (OH) 2 is added to increase the pH of the water only, but also to make Fe3 +, Zn2 +, Cu2 +, Ni2 +, Cr3 + and other heavy metal ions generated hydroxide precipitation. Typically trivalent than divalent ions of heavy metal ions more readily precipitate when the pH reaches 9.0 to 9.5, most of the heavy metal ions are formed insoluble hydroxides. Meanwhile lime slurry Ca2 + but also partial wastewater react with F-, form insoluble CaF2; As3 + complexed with the generated Ca (AsO.3) 2 and other insoluble substances. At this point Pb2 +, Hg2 + ions form still remain in the water, so in the second compartment tank by adding organic sulfides (TMT-15), so that the Pb2 +, Hg2 + to form insoluble sulfides deposited. 3) flocculation reaction after the first two-step chemical precipitation reactions, wastewater also contains many small and dispersed particles and colloidal substances, so in the third compartment tank by adding a certain percentage of flocculant FeClSO4, so they gather into large particles deposited down, at the outlet of wastewater reaction cell addition of cationic polyelectrolyte polymer coagulant as to reduce the surface tension of the particle, the particle growth process to strengthen and further promote the precipitation of hydroxides and sulfides, make small floc slow slowly become larger, more easily deposited in the floc, while desulfurization wastewater suspended solids are settling down. 4) Concentration / clarification of wastewater entering the clarification after flocculation equipped with a stirrer / concentrated pool from the reaction tank overflow, floc deposited on the bottom step and concentrated by gravity into the sludge, the upper was water. Most of the sludge discharged by the sludge pump mortar pool, a small part of the return sludge wastewater sludge as a contact reaction tank, providing the necessary precipitation nuclei. By clarifying the upper water / thickener overflow around the mouth to clean artesian water tank, water tank set up to monitor pH and suspended solids in water-line monitoring instruments, if the pH and suspended solids reach the drainage design standards through the net pump efflux, otherwise it is returned to the wastewater treatment reaction tank continues until the compliance date.