| Title | An integrated approach to achieve a circular bioeconomy in the treatment and disposal of distillery spentwash |
|---|---|
| ID_Doc | 6977 |
| Authors | Selvamurugan, M; Doraisamy, P; Maheswari, M; Valliappan, K |
| Title | An integrated approach to achieve a circular bioeconomy in the treatment and disposal of distillery spentwash |
| Year | 2024 |
| Published | |
| Abstract | Distillery spentwash from molasses-based alcohol distilleries poses a significant challenge to the Indian distilleries and the environment. Generating energy, utilizing it as fertilizer in agriculture, and using it as a growth medium for algal production are potential methods for recovering resource from the spentwash. This study primarily focuses on achieving a circular bioeconomy in the treatment and disposal of distillery spentwash. The term circular-bioeconomy underscores the integration of biological processes into the circular economy framework. In this context, the study contributes to the circular economy by not only addressing the challenge of distillery spentwash but also by incorporating biomethanation and recycling of biomethanated distillery spentwash (BDS) as organic fertilizer in agriculture, as well as algal biomass production in BDS. Biomethanation was performed at different hydraulic retention times (HRTs) using upflow anaerobic sludge blanket (UASB) reactor; a HRT of 6 days was optimum. Based on laboratory findings, full-scale UASB reactors were operated for 6 days HRT. Throughout the study period, reactors operations remained stable, with 63.09 to 65.61%, 72.59 to 77.31%, and 58.39 to 60.02% reductions in chemical oxygen demand (COD), biochemical oxygen demand (BOD), and total solids (TS), respectively, at an organic loading rate (OLR) of 2.40 to 4.52 kg COD m-3 day-1. Field experiments with groundnut and sugarcane demonstrated that BDS could serve as a valuable source of plant nutrients, sustaining crop yields, soil productivity, and soil health without polluting the soil and ground water. The use of a growth medium comprising BDS is a cost-effective alternative for treating distillery spentwash and simultaneously producing Spirulina sp. on a large scale. |
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