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- Resumen es exacto "Main objectives of this work were (i) to determine the production of municipal solid waste (MSW) and the waste organic fraction (OFMSW) of Chilca city (Huancayo province, Junín department, Perú), (ii) to evaluate the biological treatment of OFMSW through composting, and (iii) to estimate compost application doses and potential land surface to be restored. As average of the four socioeconomic strata of Chilca, a MSW generation of 0.58 kg/hab.d was determined, 48.8% corresponding to OFMSW. Based on the population census of 2017, the availability of organic material for composting was 20.9 t/d and 7618 t/yr. The composting trial was conducted employing waste separated in the MSW treatment plant, because the population response to source segregation was scarce. Composting piles with and without bulking agents (CE and SE, respectively) were installed and the quality of the final products were determined. Despite the unfavorable climate conditions prevalent in the region (extreme temperatures and precipitation), compost maturity and physicochemical properties were similar to other MSW composts reported elsewhere, and with little differences between SE and CE. The main quality limitation was the concentration of the heavy metals Cd, Pb and Zn, which were near or above the limits established in several regulations; for example, according to the Chilean regulation for heavy metals, the compost quality corresponded to Class B, an intermediate quality level; however, concentrations of these elements were higher than limits established in the Argentinian compost regulation. For this reason, annual limits and cumulative loading limits for 10-yr applications were employed to calculate precautionary doses based on Argentinian regulations for composts and biosolids, which resulted in 25 t/ha.yr (dry weight) and 85 t/ha in 10 years (dry weight). Correcting by moisture content, the precautionary dose was 40 t/ha.yr (wet weight). Based on FORSU availability, compost production and the precautionary dose, 60-80 hectares per year might be amended with the composts for agricultural use, and even more if lower doses are employed. This work offers valuable information to prepare a management plan for Chilca’s FORSU, closing the cycle of production, treatment and beneficial use."
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