Abstract
ABSTRACT The recovery of waste from the broiler production chain (BPC) is consistent with the principles of a circular economy. Besides turning waste into organic compost, its use as substrate for the production of vegetable seedlings further increases its economic value. However, it is necessary to adapt its characteristics to enable its use as substrate. To this end, the addition of boiler remnant charcoal wastes (BCW), another type of waste generated in the BPC, to the organic compost resulting from the composting of BPC waste with different bulking agents (BAs) was studied. The addition of BCW to agro-industrial compost reduced the electrical conductivity (EC) of substrates. Multiple linear regression showed that, of the 13 variables (physical, chemical and physicochemical) studied, three (EC, pH and N content) are sufficient to explain the seedling quality index (SQI). Simple nonlinear regression showed that, in order to achieve higher SQIs and easier removal of clod from tray, an additional 30% in weight of BCW is required for compost, using urban tree pruning, wood sawdust and sugarcane bagasse BAs. The use of cotton and Napier grass waste as BAs is not recommended for BPC waste mixtures, as they cause a large increase in substrate EC.
Highlights
The use of waste generated at different stages of the broiler production chain, as in other industries, is connected to the principles of circular economy
The addition of increasing doses of boiler remnant charcoal waste (BCW) to the organic compost generated by the composting of broiler production chain (BPC) agro-industrial waste decreased Organic matter (OM), N, P, electrical conductivity (EC) contents and the HLIF index, while increasing substrate pH (Table 3)
The addition of boiler remnant charcoal waste (BCW) to organic compost reduces the electrical conductivity of the mixture
Summary
The use of waste generated at different stages of the broiler production chain, as in other industries, is connected to the principles of circular economy. According to Stahel (2016), a "circular economy" would turn goods that are at the end of their service life into resources for others, closing loops in industrial ecosystems and minimizing waste It would change economic logic because it replaces production with sufficiency: reuse what you can, recycle what cannot be reused, repair what is broken, remanufacture what cannot be repaired. Its physical and chemical properties have to be more specific to achieve the expected results in the production of quality seedlings Among these properties, electrical conductivity (EC), or salinity, is the characteristic that most affects the development of seedlings (Santos et al, 2015; Moraes et al, 2018), requiring the addition of inert materials such as rice hulls, vermiculite, perlite and sand to the organic compound to decrease salt concentration and enable its use as a substrate (Bilderback et al, 2005)
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