Caracterização De Lixiviado De Aterro Sanitário E Propostas De Tratamento

Abstract

The landfill leachate is constituted by several substancesthat of difficult degradation. This study aimed to evaluate the leachate seasonal behavior at Maringá-PRlandfill. The landfill leachate was collected in four seasons of the year and characterized by pH, EC, color, turbidity, COD, BOD, TOC, NH3-N, NO2--N, NO3-N, TS, TDS and TSS parameters. The leachate varied significantly over the year,presenting the most concentrated parameters in the summer, probably due to the previous season,which presented higher temperature and lower rainfall. The variability and complexity of the leachate evidenced its need for treatment before its discharge. Several treatment techniques were proposed, considering the inexistence of a universal process for the degradation of landfillsleachates; however, the choice of the best combination depends on several factors inherent to leachate, climate, financial and legal

Prediction of Leachate Characteristics via an Analysis of the Solubilized Extract of the Organic Fraction of Domestic Solid Waste from the Municipality of Belém, PA

“…A comparison of the results obtained with the values of ammoniacal nitrogen and nitrate was carried out, in which it was possible to verify low values of ammoniacal nitrogen, when compared with that raised by other authors. The information is closer to the analyses carried out by [16] in which the values for Regions 1 (161 mg•L −1 ), 2 (230 mg•L −1 ) and 3 (289 mg•L −1 ) are close to the 224 mg•L −1 that is presented in the aforementioned author's research (Figure 11). For the nitrate values, it was possible to verify that the nitrate concentrations for Regions 1 (10 mg•L −1 ), 2 (40 mg•L −1 ) and 3 (40 mg•L −1 ) are similar to the results of [15] (12.50 mg•L −1 ) for Region 1 and the results of [16] (79.92 mg•L −1 ) and [15] for Regions 2 and 3, where it approaches the value between the two concentrations verified (Figure 12).…”

“…It is possible to visualize the verification of each parameter for this case in Table 13. For the pH values, the results below those of most of the consulted authors were verified, making it possible to verify proximity with the results of [16]. However, it is possible to notice differences between the pH values raised by the authors [14,15,[17][18][19][20], in which in these experiments the pH, for the most part, demonstrated basic characteristics.…”

“…For Regions 1 and 2, phosphorus concentrations are consistent with those of the analyses performed by [19], at a value of 34 mg•L −1 . Meanwhile, the results of the analyses of the solubilized extract for Region 3 are closer to the values of [16,43], in the order of 221.19 mg•L −1 and 107.03 mg•L −1 , respectively (Figure 13).…”

“…The by-products arising from the degradation of solid waste, which generate leachate, have variable and complex characteristics, represented, in most cases, by substantial amounts of dissolved organic acids, biochemical oxygen demand and chemical oxygen demand [43]. Except for [16], the COD concentrations obtained are higher than those of the authors consulted. Therefore, the COD values for the solubilized extract of the residues are in an average range when compared with the sources consulted in this work; however, considering the proximity to COD concentrations of leachate from landfills, it makes it possible to detect the environmental risk represented by the solubilization of solid organic waste (Figure 14).…”

“…Some studies revealed that physical-chemical analyses of the leachate verified average pH values of 7.74 [14][15][16][17][18][19][20], total solids of 4882 mg•L −1 [15,16,18,20], ammoniacal nitrogen of 909 mg•L −1 [15,16,[18][19][20], nitrite of 12.8 mg•L −1 [15][16][17][18][19][20], nitrate of 23.6 mg•L −1 [15,16,18,20], a biochemical oxygen demand (BOD) of 1507.69 mg•L −1 [14][15][16][17][18][19][20] and a chemical oxygen demand (COD) of 16,524.47 mg•L −1 . In general, leachate is a liquid that is rich in dissolved organic matter, macronutrients, metals, ammonia and xenobiotic compounds and has high levels of BOD and COD, as well as a dark color [21,22].…”