Table 5 Online detection instruments for water quality indexes.

Influent Pressure (IP), Permeat Pressure (PP), Reflux Pressure of Concentrate (CP)

bar

E + H, PMP51-48K0/0, Germany

Influent Quantity (IQ), Permeat Quantity (PQ), Reflux Quantity of Concentrate(CQ), Discharge Quantity of Concentrate

m³/h

E + H, 5W4C5H-A0L6/0, Germany

pH

–

E + H, CM442-3PQ7/0 CPS11D-7BA21

CYK10-A101, Germany

Temperature

℃

E + H, TR10-ABB1CASEG3000, Germany

Turbidity

NTU

HACH, TU5300 sc, America

COD_Mn

mg/L

HACH, COD-203A, America

SO₄^2-

mg/L

3S Analyzers, 3S-CL-SO4, Italy

Total Hardness

mg/L

HACH, EZ4000, America