公开(公告)号：US20180251390A1

公开(公告)日：2018-09-06

申请号：US15932364

申请日：2018-02-16

Applicant: James Hardie Technology Limited

Inventor： Michael James Sullivan ,  Thomas Patrick Mueller ,  Lijun Mao ,  Samantha Lopez

IPC: C02F9/00 ,  B28B17/00

CPC classification number: C02F9/00 ,  B28B17/00 ,  C02F1/004 ,  C02F1/441 ,  C02F1/5245 ,  C02F1/66 ,  C02F2001/007 ,  C02F2101/10 ,  C02F2101/101 ,  C02F2103/12

Abstract: Systems and methods for treating spent process water containing sulfate and calcium ions. A treatment method includes adding sodium aluminate to a volume of the spent process water to form a solid precipitate containing aluminum, calcium, and sulfate compounds such as ettringite (Ca6Al2(SO4)3(OH)12.26H2O). The solid precipitate is removed from the process water by clarifying and/or filtration, yielding a disposable solid waste material and a treated process water having concentrations of sulfate and calcium ions significantly lower relative to the initial concentrations in the spent process water.