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Table 2

Wastewater lot number, salinity (g·kg⁻¹), ORP (mV), pH range, and bicarbonate alkalinity (BA) (mg CaCO₃·L⁻¹) in the influent and in CR, ER and MR effluents during phase 1

		Influent		CR effluent		ER effluent		MR effluent
		pH = 6.5–7.4		6.2–7.4		6.4–7.6		5.9–7.1
Lot – salinity	Day	ORP	BA	ORP	BA	ORP	BA	ORP	BA
1 – 7.2	3	11.7	57.8 (321.7^a)	82.3	178.7	−361.4	309.9	−305.6	282.1
2 – 6.2	10	4.2	214.3	82.5	144.9	−325.5	385.7	−309.7	211.5
	18	8.0	179.3	−164.5	222.7	−387.7	495.9	−345.0	289.7
3 – 7.5	30	−24.1	489.5	−389.5	1,183.7	−403.5	1,354.3	−391.1	1,458.0
	43	−12.4	864.0	−379.4	1,237.7	−408.2	2,013.1	−402.1	2,324.2
4 – 12.6	46	−335.5	598.3	−372.2	760.3	−409.9	1,773.4	−406.5	1,913.8
	59	35.6	2,246.4	−319.2	1,737.8	−389.7	2,241.2	−402.5	2,116.4
5 – 6.2	65	−120.6	319.7	−265.3	175.0	−399.7	922.3	−398.2	868.3
	69	−22.4	324.0	−11.1	118.8	−397.8	887.8	−399.2	788.4
	73	22.7	261.6	12.5	172.2	−402.1	817.5	−398.4	797.9

		Influent		CR effluent		ER effluent		MR effluent
		pH = 6.5–7.4		6.2–7.4		6.4–7.6		5.9–7.1
Lot – salinity	Day	ORP	BA	ORP	BA	ORP	BA	ORP	BA
1 – 7.2	3	11.7	57.8 (321.7^a)	82.3	178.7	−361.4	309.9	−305.6	282.1
2 – 6.2	10	4.2	214.3	82.5	144.9	−325.5	385.7	−309.7	211.5
	18	8.0	179.3	−164.5	222.7	−387.7	495.9	−345.0	289.7
3 – 7.5	30	−24.1	489.5	−389.5	1,183.7	−403.5	1,354.3	−391.1	1,458.0
	43	−12.4	864.0	−379.4	1,237.7	−408.2	2,013.1	−402.1	2,324.2
4 – 12.6	46	−335.5	598.3	−372.2	760.3	−409.9	1,773.4	−406.5	1,913.8
	59	35.6	2,246.4	−319.2	1,737.8	−389.7	2,241.2	−402.5	2,116.4
5 – 6.2	65	−120.6	319.7	−265.3	175.0	−399.7	922.3	−398.2	868.3
	69	−22.4	324.0	−11.1	118.8	−397.8	887.8	−399.2	788.4
	73	22.7	261.6	12.5	172.2	−402.1	817.5	−398.4	797.9

^aBicarbonate alkalinity in MR influent after the addition of the buffer.

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