Study of the chemical characteristics of leachate at several landfill stations in Palangka Raya

This study aims to examine the chemical characteristics of leachate at several landfill stations in Palangka Raya. The research was carried out at the lanfill in Palangka Raya City and at the Laboratory of the Banjarbaru Research and Industrial Standardization Center, in April 2021. The method used was purposive sampling method for leachate sampling. The leachate samples were grouped into four stations categories (L), there is, L1, sample sourced from active waste landfill leachate (age <5 years); L2, sample sourced from passive landfill leachate (aged 5 - 10 years); L3, the sample is sourced from leachate in the inlet pond of the Leachate Water Treatment Plant (LWTP); L4, the sample is sourced from leachate from the LWTP outlet pond. The research data were statistically analyzed comparatively from each station. Parameters observed were pH, DHL, Total Dissolved Solid (TDS), Biochemical Oxygen Demand (BOD5), Chemical Oxygen Demand (COD), NH3-N, Fel, Hg, Pb, and Cd. The results showed that the water leachate from lanfill in Palangka Raya City has chemical properties with content below the quality standard, namely the Pb value of 0.001-0.066 mg/L and Cd of 0.003 – 0.016 mg/, the value of Biochemical Oxygen Demand (BOD) in leachate in the inlet and outlet ponds of LWTP with a value of 105-144 mg/L. Total Dissolved Solid (TDS) in leachate in inlet ponds, LWTP outlets, and in passive landfill leachate (aged 5 - 10 years) with a value of 839-1,994 mg/L. Total Fe is 1.446 – 2.980 mg/L, Hg is 2.299-2.711 mg/L, Chemical Oxygen Demand (COD) is 347.45 – 4.290.2 mg/L and Total Ammonia (NH3-T) is 88.250-665.00 mg/L is above the quality standard. The pH value of the leachate is quite high and meets the quality standard (6-9), which ranges from 6.07 to 8.31.