The reverse osmosis (RO) process has been increasingly applied to landfill leachate treatment. The published literature reports several studies that investigated the technical feasibility of RO. However, information about process costs is scarce. Also, companies that run leachate treatment plants do not provide actual costs. To fill this gap, this study aimed to evaluate the treatment costs of a full-scale RO for the treatment of landfill leachate located in Rio de Janeiro State, Brazil. A procedure was proposed to estimate the capital expenses (CAPEX), operational expenses (OPEX), and specific total treatment cost, the total cost per m³ of treated leachate, of the leachate treatment by membrane process, and the results obtained are discussed. The CAPEX for this full-scale RO was estimated at MUS$ 1.413, and OPEX ranged from US$ 0.132 to US$ 0.265 m⁻³ per year. The cost of leachate treatment has been estimated at US$ 8.58 m⁻³ considering the operation of the RO-unit for 20 years after landfill closure.

反渗透（RO）工艺已越来越多地应用于垃圾渗滤液的处理。出版的文献报道了几项研究反渗透技术可行性的研究。但是，有关过程成本的信息很少。同样，经营渗滤液处理厂的公司也不提供实际费用。为了填补这一空白，本研究旨在评估位于巴西里约热内卢州的大型RO处理垃圾渗滤液的处理成本。提出了估算资本支出（CAPEX），运营支出（OPEX）以及特定总处理成本（每m ³的总成本）的程序讨论了处理过的渗滤液，膜工艺渗滤液的处理方法以及所得结果。该全面RO的CAPEX估计为1.413马币，每年的OPEX在0.132美元至26.50万美元^-3之间。考虑到填埋场关闭后反渗透单元的运行情况，渗滤液处理的成本估计为858万美元^-3。