Table 4.

Nutrient concentrations (in mg·L⁻¹) in the STR during the stages of operation of the cascade pilot.

	Solution	K+	Mg2+	SO42−	NH4+	PO43−
Stage 1	Inlet	69.6	55.7	1,520	127	35.9
	Outlet of R1	5,959	47.2	12,707	59.3	18.3
	Outlet of R2	5,845	98.1	18,050	59.8	18.6
Stage 2	Inlet	273	52.3	6,402	979	435
	Outlet of R1	12,959	43.7	25,601	798	n.d.
	Outlet of R2	8,636	98.3	29,219	508	n.d.