NEW OPPORTUNITIES FOR CLARIFICATION OF INTENSELY COLORED FILTRATES OF SOLID WASTE LANDFILLS CONCURRENTLY WITH THEIR DECONTAMINATION USING LIMEMILK AND CALCIUM SALTS
Pages 116-122
The authors studied the effect of the process parameters (pH, concentration of Ca2+) on precipitation of humic acids contained in the filtrate of solid waste in the process of its decontamination using lime. The content of contaminants in the filtrate was monitored through the employment of well-known methodologies using methods of optical molecular and atomic spectroscopy; pH values were monitored through the employment of the potentiometric method. In some cases, chemical oxygen demand was measured to identify changes of the content of organic substances in the solution. Concentration of humic substances was identified by measuring the absorption spectra in the UV and in the visible range and by applying the calibration curve. Samples of humic and fulvic acids produced by Ecoanalitika Open Joint Stock Company were used for benchmarking purposes.The optimal amount of lime milk for the purpose of precipitation of humic substances in the filtrate is equal to 24 g/l. It is proven that any further increase of the lime milk flow is limited by the increase of the residual calcium concentration in the purified solution. Consumption of lime milk in the course of clarification of filtrates may be reduced by sharing it with calcium salts. By adding 10% of calcium chloride to the lime milk content, lime milk consumption may be reduced by 50%.
DOI: 10.22227/1997-0935.2013.8.116-122
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