Experimental Study on Prevention of Calcium Carbonate Crystallizing in Drainage Pipe of Tunnel Engineering

Table 1

Ion concentrations of the water samples (mg/L).

Ions	Ca^2+	Mg^2+	Na^+	K^+	Cl^−	SO4^2−	HCO3^−	CO3^2−
Water 1	10.4	1.2	77.6	33.5	31.7	107.2	0.0	33.4
Water 2	122.9	8. 5	90.3	61.1	9.0	142.0	0.0	28.6
Water 3	134.7	35.6	37.7	17.6	97.3	139.4	416.0	0.0