| 摘要 |
Reverse osmosis is made usable for removal of heavy metals from acid battery waste by a process in which dissolved calcium sulphate, produced by neutralization with lime, is sequestered by sodium hexametaphosphate before introduction into the permeator. The concentrated waste from the permeator is then used as a diluent for the neutralizing lime. The neutralizing lime causes the hexametaphosphate to revert to orthophosphate, whereupon calcium phosphate, and calcium sulphate are precipitated and removed.
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