| Summary: | Activities of laboratory produce wastewater with quite high hazardous materials,
therefore it is needed a good wastewater treatment plant before dispose the wastewater to
water bodies to protect environment. Recently, most laboratory of university in Indonesia
do not treat their wastewater in term of technology and cost problem. This condition will
give bad impact to the environment. This research is conducted to investigate the removal
efficiency of mercury (Hg) from laboratory wastewater by utilizing adsorption with
activated carbon combined to phytoremediation with water hyacinth and water spinach.
This research used both artificial wastewater and laboratory wastewater of
Environmental Engineering Department, Islamic University of Indonesia Yogyakarta.
Wastewater is flowed to the reactor with activated carbon for 0, 2, 4, 6 and 8 hours and
then continued with phytoremediation reactor for 0, 3, 6, 9 and 12 days as contact time.
It was shown that the efficiency of activated carbon in removing Hg from
laboratory wastewater was 97,33% after 6 hours of contact time and the efficiency of
water hyacinth was 96% after 6 days of contact time. The combination of adsorption with
activated carbon and phytoremediation with water hyacinth or water spinach can remove
Hg in wastewater almost 100%. It was clear that this system can be applied to remove Hg
from laboratory wastewater.
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