Affiliations: Centre for Environmental Engineering
Research,Department of Civil Engineering,The University of Hong Kong,Pokfulam
Road,HongKong | Department of Environmental Science and
Engineering,Harbin Institute of Technology,Harbin 150001,China
Abstract: Nearly 91% of organic pollutants in Hong Kong leachate could be
effectively removed by the UASB (upflow anaerobic sludge blanket) process
followed by the fenton coagulation.The COD (chemical oxygen demand) of leachate
was lowered from an average of 5620 mg/L to 1910 mg/L after the UASB treatment
at 37ºC,and was further lowered to 513 mg/L after fenton coagulation.The
remaining refractory residues could be further removed by photochemical
oxidation with the addition of H_2O_2 .The BOD/COD ratio was greatly increased
from 0.062 to 0.142,indicating the biodegradability of organic residues was
improved.The photochemical oxidation for the fenton-ceagulation supernatant was
most effective at pH 3-4,with the addition of 800 mg/L of H_2O_2,and UV
radiation time of 30 minutes.The final effluent contained only 148 mg/L of COD,
21 mg/L of BOD(biochemieal oxygen demand) and 56 mg/L of TOC (total organic
carbon).
