| Title |
Advanced Treatment of the Leachate Containing High Concentrations of Salts |
| Authors |
현길수 ; 최정우 ( Kil Soo Hyun ; Jeung Woo Choi ) |
| Abstract |
The objective of this research was to evaluate the configuration of wastewater treatment processes for an advanced treatment of leachate with high chlorine concentration. The raw wastewater used was leachate from the landfill of incinerated ashes of municipal wastes and contained heavy metals, ions materials, and toxic substances as well as high concentration of salts and nitrogen. The advanced wastewater treatment system used in this research consists of activated sludge process, sedimentation basin, trickling filter, coagulation-flocculation-sedimentation basins, rapid sand filters, granular activated carbon (GAC) beds, and membrane filters. As a results of this researches, using anaerobic and aerobic conditions for denitrification and nitrification, the activated sludge process removed approximate more than 90% of total nitrogen (T-N) and ammonia nitrogen (NH₄-N), which indicated that it was considerably effective in removing nitrogen. Conventional contaminants such as BOD, COD, and SS were removed more than 80% through the flocculation-sedimentation processes. Through the filtration and the adsorption, the residual contaminants except for total dissolved solids (TDS) and ions almost never removed by them were reduced less than 1㎎/ℓ, TDS and ions of chlorine and calcium removals by membrane filter (reverse osmosis, RO) alone averaged 98%, which describes it was considerably effective in sperating saline solution from the wastewater containing high salts concentration. Based on these results, it describes that the proper configuration of wastewater treatment processes is important to produce the water adequated to effluent standards, which can be expected the application of the wastewater reuse as well as the protection of water environment. |