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Citation: WANG Peng, FANG HP Herbert. Fenton Coagulation of Leachate Pretreated in an Upflow Anaerobic Sludge Blanket Reactor[J]. Chinese Journal of Applied Chemistry, ;2001, 18(5): 408-411. shu

Fenton Coagulation of Leachate Pretreated in an Upflow Anaerobic Sludge Blanket Reactor

WANG Peng ^a ,
FANG HP Herbert ^b

1.
a Department of Environmental Science and Engineering, Harbin Institute of Technology, Harbin 150001;
2.
b Centre for Environmental Engineering Research, Department of Civil Engineering, The University of Hong Kong, Hong Kong SAR

Received Date: 30 December 2000
Available Online: 11 April 2001
Fund Project: 香港政府研究基金资助项目(7098/99E) (7098/99E)

The leachate from a Hong Kong landfill, containing 15.70 g/L of chemical oxygen demand (COD) and 2.26 g/L of ammonia nitrogen (NH₃-N), was first treated in a UASB (upflow anaerobic sludge blanket) reactor at 37℃. The process on average removed 90.4% of COD with 6.6 days of hydraulic retention at an organic loading rate of 2.37 g/(L·day) COD. The UASB effluent was further treated by the Fenton coagulation process using H₂O₂ and Fe²⁺. Under the optimal condition of 200 mg/L H₂O₂ and 300 mg/L Fe²⁺ and initial pH 6.0, 70% of residual COD in the UASB effluent was removed, of which 56% was removed by coagulation/precipitation and only 14% by free radical oxidation. It is obvious that H₂O₂ and Fe²⁺ had a strong synergistic effect on coagulation. The average COD in the final effluent was 447 mg/L. Removing each gram of COD required 0.18 g of H₂O₂ and 0.28 g of Fe²⁺, the Fenton coagulation process was discussed in this paper.
- landfill leachate,
- upflow anaerobic sludge blanket,
- Fenton coagulation,
- wastewater treatment
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