| abstract |
(57) [Summary] [Purpose] To provide a wastewater purification treatment agent having extremely excellent biochemical oxygen demand (BOD), chemical oxygen demand (COD) and suspended solids (SS) removal efficiency. [Structure] A wastewater purification treatment agent comprising a polynuclear metal complex salt-containing aqueous solution obtained by heating a mixed aqueous solution of a sulfate of plural metals such as potassium, iron, calcium, sodium, magnesium and aluminum at a constant volume. The molar concentration of potassium is 0.02 to 0.08, iron is 0.11 to 1.31, calcium is 0.003 to 0.03, and sodium is 0.004. .About.0.040, 0.27 to 0.81 of magnesium, and 0.370 to 1.300 of aluminum, the polynuclear metal complex salt-containing material obtained by heating a mixed aqueous solution of a plurality of metals in a constant volume. Are preferred wastewater purification treatment agents. |