How can heavy metals be treated with lime?
Disadvantages such as alum, small proportion, fragile, slow settlement, heavy metal wastewater treatment, high water content, wastewater treatment after recovery difficult.
Lime neutralization treatment of heavy metal acid wastewater is an old method. Because the hydroxyl ion in lime can most heavy metal mercury settlement outside, and the sedimentation rate is high, the low cost of lime and lime, the settlement process is short hair.
Process is as follows. Processing mainly containing suspended particles less than millimeter, colloidal particles and really exist in the form of a solution of organic pollutants with lime, CODcr value is greater than 120, to discharge, reuse, further biochemical treatment or chemical treatment of city sewage and industrial wastewater, in addition to the chemical measurement to CIC sewage or waste water and make it pH the value increased to 9 lime, which comprises the following steps: (1) to lime and stir to lime amount: K: 1 * SS + K: 2 * CODcr + C, among them, K down 1 value = 0.1 - 1; K: 2 value = 0.1 ~ 3; C lime solubility; SS for total suspended solids in sewage and waste; (2) the separation of solid and liquid precipitation. The said method can separate suspended particles, colloidal particles and some organic pollutants in the form of real solution from waste water and waste water.
