Abstract
A two‐stage process was developed for the treatment of landfill leachate in Hong Kong. The leachate contained 15700 mg/L of chemical oxygen demand (COD) and 2300 mg/L of ammonia‐nitrogen (NH3‐N). In the first stage, it was treated in a UASB (upflow anaerobic sludge blanket) reactor at 37° C. The process removed 89%‐91% COD on average within a 6.6 days hydraulic retention period. The UASB effluent, containing 1500 mg/L COD, was then treated in the second stage using a Fenton coagulation process with H2O2 and excess Fe2+. In this process, organic substances were oxidized and precipitated through the Fenton reaction and coagulation. 70% COD of the UASB effluent was further removed. The optimal parameters of the Fenton coagulation process were determined as an initial pH between 4 and 6, mixing for 5–10 min, a Fe2+ concentration of 300 mg/L, and a H2O2 concentration of 200 mg/L. The final effluent contained a 447 mg/L COD, which was acceptable sewer system level according to the present Hong Kong regulations.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Environmental Science and Health, Part A
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
