Abstract
The moisture of river sediment significantly influenced its dehydration and the disposal cost. Response surface method (RSM) and central composite design (CCD) were applied to optimize the effectiveness of combined oxidation conditioning process using Fe (Ⅱ) and potassium persulfate (K2S2O8). The results indicated that the optimum values for K2S2O8, Fe(Ⅱ), and initial pH were found to be 22.26 mg•g-1 TSS, 43.63 mg•g-1 TSS(n(K2S2O8): n(Fe(Ⅱ))=1:1.9), pH=5.95, respectively. CST reduction was decreased to 86.16% in 10 min, in agreement with the predicted value of 86.44%. R2 and Radj 2 of predicted model was 0.905 8 and 0.821 1, respectively, which showed that RSM could explain the dehydration process with combined oxidation conditioning. ANOVA analysis confirmed that Fe(Ⅱ) (P<0.001) had the largest effect on CST reduction, followed by initial pH (P=0.023) and then K2S2O8. Compared with polymeric ferric sulfate (PFS) and polyacrylamide (PAM), the combined oxidation conditioning has good performance in economy and dehydration property.
| Translated title of the contribution | Dehydration property of river sediment with combined conditioning using Fe(Ⅱ)-potassium persulfate |
|---|---|
| Original language | Chinese (Traditional) |
| Pages (from-to) | 338-348 |
| Number of pages | 11 |
| Journal | Chinese Journal of Environmental Engineering |
| Volume | 12 |
| Issue number | 1 |
| DOIs | |
| State | Published - 5 Jan 2018 |