STUDY ON TREATMENT OF COD, BOD5 AND AMONIUM IN LEACHATE TREATED BY COMBINED MICROALGAE CHLORELLA SP AND SCENEDESMUS SP

Abstract

Microalgae Chlorella sp. and Scenedesmus sp. are able to survive in pre-
treated leachate (containing dark-colored and high concentration of
pollutants), but slow growth rate and low treatment efficiency. Leachate
pretreated by using lime combined with feton or added coagulant, then
treated by using Chlorella sp. and Scenedesmus sp. that was resulted in COD,
BOD5 and NH4
+ treatment efficiency up to 65.9 - 79.8%, 81.2 - 88.2%, 81.5 -
89.9% respectively. The contents of COD, BOD5 and NH4
+ in leachate were
5687.2, 1492.1 and 608.78mg/L respectively. It needed to pretreat with the
combination of coagulation, lime and fenton, the later treatment step was
application of microalgae for 14 days, then the output water quality met the
requirement of QCVN 25:2009/BTNMT of B1 columm (in which COD -
126.0mg/L; BOD5 - 44.4mg/L; NH4
+ - N - 20.07mg/L).