AI Article Synopsis
- - Co-pyrolysis, which involves heating biomass waste in low-oxygen conditions, can effectively manage waste and create valuable biochar that improves soil health and reduces harmful metal availability.
- - The study evaluated the properties of biochar produced from a mix of wheat straw, rice husk, pig manure, and oyster shells, finding that co-pyrolysis enhances the heating value of gases produced and improves biochar quality.
- - Pot experiments showed that biochars, especially from co-pyrolysis, boosted soil fertility and microbial activity while reducing harmful metals more effectively than traditional limestone amendments, suggesting that using co-pyrolysis biochar could financially benefit agricultural productivity.
Article Abstract
Co-pyrolysis is a potentially effective method for both biomass waste management and multi-functional biochar-based product design. It involves the thermochemical decomposition of biomass waste under anoxic conditions, which can reduce the cost of disposal and produce biochar with beneficial properties. Herein, this study aimed to investigate the properties and environmental applications of biochar from single- and mixed- feedstocks of wheat straw, rice husk, pig manure, and oyster shell at 450 ℃, respectively. A pot experiment with Chinese cabbage was carried out to compare the effects of biochars with limestone on soil Cd and Pb immobilization at two harvest periods. The results indicated that co-pyrolysis of various biomasses exhibited synthetic effects on promoting the calorific value of syngas and enhancing the quality of produced biochar. The pot experiment revealed a significant promotion on soil pH, soil organic matter, cation exchange capacity, and soluble Ca, which consequently reduced Cd and Pb availability. In contrast with limestone treatment, soil amendment with single biomass-derived and co-pyrolysis-derived (COPB) biochars had a significant positive impact on soil fertility and microbial biomass. Application of COPB at a 0.5% dosage consistently and most effectively enhanced the shoot biomass, increased leaf Vitamin C content but reduced leaf content of nitrate and heavy metals in both harvests. Using COPB for soil remediation would be financially visible due to the enhancement of crop yield. Therefore, this study proposes a strategy for targeted enhancement of the functions of biochar derived from co-pyrolysis of selected biomass waste for soil remediation and agricultural production.
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| http://dx.doi.org/10.1016/j.wasman.2023.03.022 | DOI Listing |
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