Environmental carrying capacity of Batujai Reservoir-Praya, Central Lombok in terms of water quality and the role of eichhornia crassipes in nutrient and lead (Pb) removal
Keywords:
carrying capacity, Eichhornia crassipes, lead, nutrients, water qualityAbstract
Background: The Batujai Reservoir faces challenges related to nutrient pollution and heavy metal contamination. Phytoremediation using Eichhornia crassipes has been recognized for its potential to mitigate water quality issues. This study evaluates the environmental carrying capacity of the Batujai Reservoir, focusing on water quality and the role of Eichhornia crassipes in the removal of nutrients and the heavy metal lead (Pb). Methods: Water quality analysis was conducted by measuring pH, temperature, dissolved oxygen (DO), and total dissolved solids (TDS). Analysis of concentrations of total phosphorus, total nitrogen, and Pb at both the inlet and outlet of the reservoir. Findings: The study found that DO levels remained high and stable at both the inlet and outlet, with a slight reduction at the outlet due to organic matter decomposition. Eichhornia crassipes contributed to maintaining DO levels through photosynthesis. The pH ranged from 7.94 to 8.30, slightly alkaline, supporting Pb stabilization as precipitates. The temperature increased from inlet to outlet but remained within normal limits. Low TDS (154.33–159.67 mg/L) indicated good water quality, while a decrease in conductivity from inlet to outlet suggested the absorption of dissolved ions by Eichhornia crassipes. The plant effectively absorbed nitrogen, phosphate, and Pb, confirming its role as a phytoremediation agent. However, uncontrolled growth could result in mass decomposition and oxygen depletion, which may harm the ecosystem. Conclusion: The study concludes that the Batujai Reservoir has stable water quality, supporting its capacity to maintain aquatic life. Nevertheless, careful management of Eichhornia crassipes is required to prevent ecological imbalance caused by overgrowth and decomposition. Novelty/Originality of this Study: This study contributes new insights into the dual role of Eichhornia crassipes in maintaining water quality and acting as a phytoremediation agent for nutrient and heavy metal (Pb) removal in the Batujai Reservoir. It highlights the importance of balancing Eichhornia crassipes growth to optimize environmental carrying capacity.
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Copyright (c) 2025 Siti Raudhatul Kamali, Immy Suci Rohyani, Ernawati, Annisa Arimbi Murfi, Zulvi Amelia Sari, Lalu Malik Fajar
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