COMBINATION OF SEAWEED (GRACILARIA SP.) AND BLOOD COCKLES (ANADARA GRANOSA) WITH ZEOLITE AS BIOFILTER TO REDUCE LEAD (PB) IN NPK FERTILIZER WASTE

The biofilter is a wastewater treatment system that is carried out by flowing wastewater into a biological reactor filled with a filter to reproduce contaminant decomposer microorganisms that contained in wastewater either using aeration or without aeration. This study objective is to determine the appropriate combination to reduce lead (Pb). This study uses an experimental method with a completely randomized design consisting of five treatments group and four replications each group. The treatment group in this study are proportion differences of Gracillaria sp. and Anadara granosa combination. The parameters observed in this study were the levels of heavy metals in seaweed, cockles, and water. Data analysis using Analysis of Variant (ANOVA) and continued with Duncan's Multiple Range Test. The results show that the use of a combination of Gracillaria sp. and Anadara granosa can absorb lead (Pb) in NPK fertilizer waste with the best combination in P2 treatment group with a proportion of 50% Seaweed (Gracillaria sp.), 50% Blood cockles (Anadara granosa) and Zeolite. The combination of Gracillaria sp. and Anadara granosa as biofilter can be used as an alternative in a wastewater treatment system to reduce lead (Pb) pollution which is very dangerous for the environment.