The invention discloses a zero-
discharge method for strong brine containing high-concentration
heavy metals. The zero-
discharge method comprises the following steps: firstly,
precipitation of
heavy metals; secondly,
softening; thirdly, tubular micro-
filtration; fourthly,
evaporation and
crystallization. The zero-
discharge method for the strong brine containing the high-concentration
heavy metals, disclosed by the invention, is characterized in that in
effluent obtained by
fractional precipitation, namely evaporated and crystallized incoming water, the content of
zinc is smaller than 1.0mg / L, the content of lead is smaller than 1.0mg / L, the content of
cadmium is smaller than 1.0mg / L, the content of
copper is smaller than 0.5mg / L, and the content of
nickel is smaller than 1.0mg / L. In heavy
metal sludge precipitated by the method disclosed by the invention, the contents of
zinc and lead are high; the method can be used for recovering
zinc oxide and
lead oxide; in an
evaporation and
crystallization system disclosed by the invention, the salt separating rate is higher than or equal to 95 percent, the
recovery rate of water is higher than or equal to 95 percent, and salts obtained by evaporating and crystalizing can be used as industrial salts for selling;
distilled water is recycled for backwash of a
water treatment system,
medicine preparation and the like. According to the zero-discharge method disclosed by the invention, resources are recovered to the maximum extent while the difficult problems of high
pollution and difficulty in discharge of high-
salinity wastewater rich in the heavy metals generated by
post treatment of a garbage power
plant are solved, and near-zero discharge is realized.