| Title |
Coking wastewater treatment by coagulation coupled with Fenton and hydrodynamic cavitation/Fenton |
| ID_Doc |
64939 |
| Authors |
Feng, XQ; Jin, RY; Qiao, YN; He, ZD; Wang, K; Wang, CQ; Lu, YR; Zhang, YF |
| Title |
Coking wastewater treatment by coagulation coupled with Fenton and hydrodynamic cavitation/Fenton |
| Year |
2021 |
| Published |
|
| DOI |
10.5004/dwt.2021.27489 |
| Abstract |
In the present study, chemical oxygen demand (COD) was taken as the primary aspect of investigation in order to evaluate the efficiency of advanced treatment of coking wastewater by coagulation-flocculation coupled with Fenton and hydrodynamic cavitation (HC)/Fenton. The coagulation process had a COD removal rate of 71.49% with the FeCl3 = 800 mg/L, pH of raw water, and no flocculant polyacrylamide (PAM) added. Further treatment of Fenton and HC/Fenton was carried out on the coagulated effluent. Using Fenton processes, it was investigated the dosage, reaction time and the influence of mole ratio of H2O2:Fe2+. It was proven, that the molar ratio of H2O2:F-e(2+) = 4:1, H2O2 = 50 mM, reaction for 80min, the total removal rate was 88.83%, met emission standards. HC/Fenton process was applied at the same Fenton ratio and dosage, and the total removal rate was 98.51% at 40 min, with a remaining COD = 3.4 mg/L, being almost completely removed. Fenton dosage was 30 mM for a 50 mM reaction in HC/Fenton process, the obtained total removal rate being 87.91%, with a remaining of COD = 27.66 mg/L, which meets the 40 mg/L stipulated in the Emission standard of pollutants for coking chemical industry (GB16171-2012). HC/Fenton increased the reaction rate, which was three times higher than that of Fenton process, and reducing in this way the amount of applied Fenton reagent. Meanwhile, the cost-efficiency of each process is calculated, the coagulation-Fenton process cost reaching 4.205 CNY/m(3), and the coagulation-HC/Fenton cost of 7.75 CNY/m(3). |
| Author Keywords |
Coking wastewater; Coagulation; Fenton; Hydrodynamic cavitation; Chemical oxygen demand |
| Index Keywords |
Index Keywords |
| Document Type |
Other |
| Open Access |
Open Access |
| Source |
Science Citation Index Expanded (SCI-EXPANDED); Conference Proceedings Citation Index - Science (CPCI-S) |
| EID |
WOS:000691618400011 |
| WoS Category |
Engineering, Chemical; Water Resources |
| Research Area |
Engineering; Water Resources |
| PDF |
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