Treatment the leachate of a landfill using physical and biological processes

Abstract

The physical, chemical, and biological features of leachate were explored. The sequencing batch reactor (SBR) is a fill-and-draw activated sludge system for wastewater treatment. In this system, wastewater is added to a single "batch"reactor, treated to remove undesirable components, and then discharged as a biological treatment procedure following the primary treatment cycle. Advanced membrane technology such as UF and RO was used for biological wastewater. Due to the lack of a comprehensive waste separation stage, heavy metal concentrations in leachate samples varied due to various solid waste types such as metal electroplating, stabilizers, or pigments in plastics, batteries, and alloys. The Fe and Cr concentrations are the greatest, exceeding 5 ppm, while the Cd and Cu concentrations are below the detection limit. COD, TSS, Ammonia nitrogen, and phosphate are removed 93.6 percent, 96.8, 100, and 97 percent, respectively, in the main and biological treatment utilizing SBR. The sophisticated membrane technology was used in the final stage of treatment (UF and RO). The removal of TSS, phosphate, Al, Zn, and Fe from SBR effluent using UF units were shown to be very efficient, with (100), (97.4), (86.5), (83), and (93.6%), respectively. Heavy metals were partially eliminated, although there was no difference in Cd content. A RO unit eliminated COD, TSS, Ammonia Nitrogen, Al, and Na with a 97-100 percent efficiency; however, Cr and Cd concentrations remained high.