title: Mineral and organic compounds in leachate from landfill with concentrate recirculation.
abstract: The effect of a reverse osmosis concentrate recirculation on the mineral and organic compounds in a landfill leachate was investigated. Investigated was the quality of a leachate from two landfills operated for different periods (a 20-year-old Cell A and a 1-year-old Cell B), where the concentrate was recirculated. Examined were general parameters (conductivity, pH), organic compounds (biochemical oxygen demand (BOD), chemical oxygen demand (COD), total organic nitrogen, BOD/COD), and inorganic compounds (nitrogen ammonia, sulfite, sulfate, cyanide, boron, chloride, ferrous, zinc, chrome, copper). The findings from the first year of investigation showed that over the initial period of recirculation, the concentration of organic compounds (BOD, COD) increased, but after 6 months their values stabilized. It indicates that the concentrate recirculation accelerated organic decomposition, especially in the new landfill Cell. The analysis of inorganic parameters showed that recirculation landfills produce a leachate with a higher concentration of N-NH4, and Cl(-). In case of the old landfill Cell, an increase in B and Fe was also noticeable. These compounds are cyclically washed out from a waste dump and require an additional pretreatment in order to exclude them from recirculation cycle. The increased concentration of Cu, Zn, and Fe was noticed during the initial months of recirculation and in the season of intense atmospheric precipitation in the leachate from both Cells. Higher values of electro conductivity, Cl(-), N-NH4 (+), B, and Fe in the leachate from the old field indicate that the attenuation capacity of this landfill is close to exhaustion.
authors.affiliation: Department of Environmental Engineering Systems, Bialystok University of Technology, 45A Wiejska Street, 15-351, Bialystok, Poland, izabela.tj@gmail.com.
authors.forename: Izabela Anna
authors.initials: IA
authors.lastname: Talalaj
mesh_terms: D057919:Biological Oxygen Demand Analysis; D003300:Copper / Q000032:analysis; D007854:Lead / Q000032:analysis; D008903:Minerals / Q000032:analysis; D009584:Nitrogen / Q000032:analysis; D009930:Organic Chemicals / Q000032:analysis; D009995:Osmosis; D012037:Refuse Disposal / Q000379:methods*; D064091:Waste Disposal Facilities; D014874:Water Pollutants, Chemical / Q000032:analysis*; D015032:Zinc / Q000032:analysis
chemical_list: D008903:Minerals; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D007854:Lead; D003300:Copper; D015032:Zinc; D009584:Nitrogen