An extensive analysis of combined processes for landfill leachate treatment is presented, highlighting the effectiveness of integrated treatment methods over single processes. Landfill leachate (LL) contains complex pollutants, including organic matter, heavy metals, and toxic compounds, making it challenging to treat. Conventional methods such as biological, chemical, and physical treatments are insufficient, necessitating combined approaches. Chemical-chemical and chemical-biological treatments are most commonly used, with processes like Fenton with adsorption and membrane bioreactor (MBR) with nanofiltration (NF) showing high removal efficiencies for COD, reaching up to 99%. Combined processes also enhance biodegradability, as indicated by increased BOD5/COD ratios. The review emphasizes the importance of developing and implementing enhanced combined treatment processes to achieve efficient pollutant mineralization and sustainable waste management. Key findings include the effectiveness of integrated processes in reducing COD, improving biodegradability, and meeting environmental standards. The study also discusses the challenges and limitations of individual treatments and provides recommendations for optimizing combined processes. Overall, integrated treatment methods offer a more effective and comprehensive solution for LL treatment.An extensive analysis of combined processes for landfill leachate treatment is presented, highlighting the effectiveness of integrated treatment methods over single processes. Landfill leachate (LL) contains complex pollutants, including organic matter, heavy metals, and toxic compounds, making it challenging to treat. Conventional methods such as biological, chemical, and physical treatments are insufficient, necessitating combined approaches. Chemical-chemical and chemical-biological treatments are most commonly used, with processes like Fenton with adsorption and membrane bioreactor (MBR) with nanofiltration (NF) showing high removal efficiencies for COD, reaching up to 99%. Combined processes also enhance biodegradability, as indicated by increased BOD5/COD ratios. The review emphasizes the importance of developing and implementing enhanced combined treatment processes to achieve efficient pollutant mineralization and sustainable waste management. Key findings include the effectiveness of integrated processes in reducing COD, improving biodegradability, and meeting environmental standards. The study also discusses the challenges and limitations of individual treatments and provides recommendations for optimizing combined processes. Overall, integrated treatment methods offer a more effective and comprehensive solution for LL treatment.