UTILIZATION POTENTIAL OF ANAEROBIC DIGESTATE OF LEACHATE TREATMENT PLANT AS A COMPOST

• Main Author: Khairunnisa P., Mutiara
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik saniter dan perkotaan; teknik perlindungan lingkungan
• Online Access: https://digilib.itb.ac.id/gdl/view/69281
• Institution: Institut Teknologi Bandung

The declining quality of the soil due to the use of chemicals causes the need for organic soil amendment, one of them is compost. Meanwhile, waste processing in Indonesia still relies on using landfill which causes the production of leachate from rainwater infiltration in the waste. One of the leachate treatments is by anaerobic digestion. Anaerobic digestion produces biogas and a by-product in the form of sludge which has the potential to be used as a soil amendment. This research was conducted using digestate from the anaerobic pond of the TPK Sarimukti leachate treatment plant. Anaerobic digestate was tested for levels of C, N, P, moisture content, pH, heavy metals, and TCLP. In addition, anaerobic sludge was also applied to the growth of red bean plant (Phaseolus vulgaris L.). Observations on plant height, number of leaves, and leaf area were carried out for 41 days. This research shows that the levels of C-organic and nitrogen meet the compost quality standards, while phosphorus does not meet the compost quality standards. However, C/N has not met the compost quality standard according to SNI: 19-7030-2004. Observation of the leaves from plants with 25% anaerobic digestate treatment showed nitrogen toxicity in plants. The levels of heavy metals that exceed the quality standard are Cadmium (Cd), copper (Cu), and zinc (Zn). The levels of Cu and Zn are still within the critical limits of soil pollution. Meanwhile, the levels of cadmium (Cd) have exceeded the critical limit/threshold for contamination of the soil from the Soil Research Institute. The metal content in TCLP anaerobic sludge met the technical requirements as stated in the Regulation of the Minister of Environment and Forestry No. 6 of 2021. The results of the application of anaerobic digestate on red bean plants also showed that growth was inhibited along with the increase in the composition of anaerobic sludge. The order of heavy metal concentrations in plants treated with 25% anaerobic sludge was Zn > Cu > Cr > Ni > Pb > Se > As > Hg > Co > Cd. While the order based on the translocation is root > stem > leaf.