Conditioning method

Medicine ratio

Initial CST

Reaction pH

CST reduction rate

Wc

references

${\text{Fe}}^{\text{2}+}/{\text{S}}_{\text{2}}{\text{O}}_8^{2-}$

+ CaO + fly ash

${\text{S}}_{\text{2}}{\text{O}}_8^{2-}$ : 320 mg/gDS, CaO: 400 mg/g, fly ash: 500 mg/g, n(Fe²⁺):n(SPS) = 1.5

/

6.89

/

54.9%

[12]

${\text{Fe}}^{\text{2}+}/{\text{S}}_{\text{2}}{\text{O}}_8^{2-}$

Fe²⁺: 1.5 mmol/gVSS, ${\text{S}}_{\text{2}}{\text{O}}_8^{2-}$ : 1.2 mmol/gVSS, n(Fe²⁺):n(SPS) = 1.25

210 s

6.95

88%

/

[14]

${\text{Fe}}^{\text{2}+}/{\text{S}}_{\text{2}}{\text{O}}_8^{2-}$

Fe²⁺: 23.52 mg/gDS, ${\text{S}}_{\text{2}}{\text{O}}_8^{2-}$ : 80 mg/gDS, n(Fe²⁺):n( SPS) = 1

47.2 s

6.5 - 7.5

60%

78.51%

(Room temperature)

[16]

Heat activated ${\text{S}}_{\text{2}}{\text{O}}_8^{2-}$ + Biological activated carbon

${\text{S}}_{\text{2}}{\text{O}}_8^{2-}$ : 120 mg/gVSS,

Biochar: 150 mg/gVSS

1 (Standardized unit)

No adjustment

−5.03

(Standardized unit)

42.6% (70˚C)

[25]

UV + Fenton

H₂O₂: 4 g/L, Fe²⁺: 0.6 g/L

~3

76.36%

[26]

Fenton

H₂O₂: 3g/L, Fe²⁺: 0.3 g/L

H₂O₂/Fe²⁺ = 8 - 12:1

53.9 - 72.8 s

~3

67.8%

72%

[27]

${\text{Fe}}^{\text{2}+}/{\text{S}}_{\text{2}}{\text{O}}_8^{2-}$

Fe⁰: 15 g/L, ${\text{S}}_{\text{2}}{\text{O}}_8^{2-}$ : 4 g/L

/

~7

50.2%

/

[28]

${\text{Fe}}^{\text{2}+}/{\text{S}}_{\text{2}}{\text{O}}_8^{2-}$ + CaO

Fe²⁺: 18.9 mg/gDS, ${\text{S}}_{\text{2}}{\text{O}}_8^{2-}$ : 81 mg/gDS, CaO: 200 mg/g, n(Fe²⁺):n(SPS) = 0.8

73 s

~7

53.5%

53.7%

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