| Abstrakt: |
Agricultural chemicals have compromised the climate, human and animal health, groundwater aquifers, and recreational potential of water bodies. Digestate is a possible agent to attenuate external costs imposed on the biosphere by chemical fertilizers. However, nutrient speciation of digestate derived from anaerobic digestion (AD) of cassava peeling residue (CPR) as sole feedstock is not found in published literature. Also unknown is to what extent CPR digestate could substitute inorganic fertilizers in cassava root production. In this study, external costs of agricultural production technologies are thoroughly highlighted. AD experiments were conducted to quantify macronutrients composition of liquid fraction digestate of CPR as sole feedstock. Capability of liquid fraction digestate of CPR to supplant chemical fertilizers in cassava root production was also evaluated. Results indicate that total kjeldahl nitrogen, total phosphorus, and total potassium content are, respectively, 573 mg/L, 31 mg/L, and 1066 mg/L. Also, likely up to 28% nitrogen, 11% phosphorus, and 38% potassium sourced from chemical fertilizers for cassava root production could be replaced with liquid fraction CPR digestate. The results could be used to influence contribution of CPR to the outcome of AD operations when co-digested with other feedstocks; thereby empowering process optimization. The results may also enable typology criteria for quality assurance and regulatory standards for liquid fraction CPR digestate. This paper is potentially the first to report nutrients value of liquid fraction of mono feedstock CPR digestate; and the first to quantify the nutrients capability to supplant inorganic fertilizers in cassava root production. Schematic visualization of the objectives and summary of this paper [ABSTRACT FROM AUTHOR] |
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