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Solid waste, landfill, leachate, SPSS, statistical analysis, characteristics
This research was aimed to study municipal solid waste landfills leachate parameters for different sanitary landfill designs such as open dumping, anaerobic, and semi-aerobic with various ages in different countries. Landfill leachate characteristics such as pH, electrical conductivity (EC), turbidity, color, ammonia-nitrogen (NH3-N), biochemical oxygen demand (BOD), chemical oxygen demand (COD), biodegradability ratio, total solids (TS), total suspended solids (TSS), iron (Fe) and phenols and the age of landfills were used for examining in the statistical analysis. Application of statistical package for social sciences (SPSS) for statistical analysis for the mentioned parameters was another goal for this work. Results showed that leachates parameters such as turbidity, color, NH3-N, BOD, COD, TSS, Fe, and phenols were surpassed the standard limits for disposal. SPSS results presented that strong correlation (r > 0.5 at P < 0.005) discovered amongst NH3-N with BOD/COD, TS, and TSS; between BOD/COD with TS and TSS; among TS with TSS, Fe, and EC, and amid Fe and EC. The age of landfills generally hadn’t important statistical correlation with the aforementioned landfill leachate parameters; merely color approached to have a correlation with age (r = - 0.986 at P = 0.054).
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