A modified magnesium hydroxide slurry for use in treating wastewater and a process for producing thereof

摘要

A process for preparing a modified magnesium hydroxide slurry to be used for treating waste water and a method for treating wastewater using a modified magnesium hydroxide slurry containing a high calcium hydroxide content are described. In a typical wastewater treatment system (1), transition or heavy metals are removed via hydroxide precipitation. The waste stream (2) is separated from the return sludge (9), which is discharged as waste sludge (10) for further processing or disposal, and neutralized with an alkali (3) in a neutralization tank (4), in which is immersed pH probe (5). A polymer (6) may be added to the waste stream (2) and the waste stream (2) may be flocculated in a flocculator (11) in order to agglomerate smaller metal hydroxide particles into larger particles for faster settling. The settled metal hydroxide particles are collected at the bottom of a clarifier (7) as waste sludge (10) for further processing or disposal. The clarified filtrate is then properly discharged as effluent (8).