This study was aimed to assess the leachate properties of the treated municipal solid waste by potassium carbonate (K₂CO₃) obtained from a landfill located in Barmshour, Iran. Consequently, two bioreactors were filled with the same waste in the laboratory. Potassium carbonate was added to one of the reactors and then both bioreactors were cured under the same conditions for 6 months. The physico-chemical properties of the produced leachate such as the volume, pH, COD, BOD, metals and non-metal ion concentration were measured at different time intervals. Results indicated that the applied K₂CO₃ initially increased the leachate volume; however, it decreased the volume of leachate by 72.7% after 6 months. The pH of the control sample observed to be acidic (< 5) after 30 days. Adding K₂CO₃ prevented the reduction of the pH of leachate since it is an alkaline additive and the pH was measured 7.6–9.2 after 30 days. Furthermore, concentrations of all heavy metals were reduced in the leachate by adding potassium carbonate. At the end of the experiment, the COD and BOD of the reactor treated with K₂CO₃ were reduced by 39.4% and 37.8%, respectively. The leachate pollution index was calculated to be 28.1 and 19.4 after 180 days of the experiment for the untreated sample and potassium carbonate added sample, respectively. The overall results obtained in this study indicated that adding potassium carbonate to the waste can reasonably well improve the quality of leachate and can reduce its environmental hazards.

本研究旨在评估从位于伊朗 Barmshour 的垃圾填埋场获得的碳酸钾 (K ₂ CO ₃ )处理后的城市固体废物的渗滤液特性。因此，实验室中的两个生物反应器装满了相同的废物。将碳酸钾加入其中一个反应器中，然后两个生物反应器在相同条件下固化 6 个月。在不同的时间间隔测量产生的渗滤液的物理化学性质，例如体积、pH、COD、BOD、金属和非金属离子浓度。结果表明，施加的 K ₂ CO ₃最初增加渗滤液量；然而，它在 6 个月后减少了 72.7% 的渗滤液量。观察到对照样品的 pH 值在 30 天后呈酸性 (< 5)。添加 K ₂ CO ₃阻止了浸出液 pH 值的降低，因为它是一种碱性添加剂，30 天后测得的 pH 值为 7.6-9.2。此外，通过添加碳酸钾降低了浸出液中所有重金属的浓度。实验结束时，K ₂ CO ₃处理的反应器的COD和BOD分别减少了 39.4% 和 37.8%。未经处理的样品和添加碳酸钾的样品经过 180 天的实验后，渗滤液污染指数分别计算为 28.1 和 19.4。本研究获得的总体结果表明，向废物中添加碳酸钾可以合理地提高渗滤液的质量，并可以减少其对环境的危害。