| Title | Enriched biogas and biofertilizer production from Eichhornia weed biomass in cow dung biochar-amended anaerobic digestion system |
|---|---|
| ID_Doc | 14880 |
| Authors | Sharma, B; Suthar, S |
| Title | Enriched biogas and biofertilizer production from Eichhornia weed biomass in cow dung biochar-amended anaerobic digestion system |
| Year | 2021 |
| Published | |
| Abstract | The effect of cow dung biochar on water hyacinth anaerobic digestion with control setup (without biochar (T-0) was investigated using a batch scale setup (at 35 degrees C). Biochar was applied in three doses (v/v) 0.5% (T-0.5), 1% (T-1), and 1.5% (T-1.5) in anaerobic digestion setups and daily and cumulative biogas formation was recorded in all setups. Results revealed that biochar addition reduced the lag phase from 3 d to 1 d but extended in a higher dose (1.5%). The cumulative biogas production was fund to be 2721 mL in T-1 followed by, 2388 mL (T-0.5), 1940 mL (T-1.5), and 1153 mL (T-0) (p < 0.001 for all) by the end of 35 days of the AD process. The maximum biogas production improved by 40.6-57.6%, in biochar setups than T-0. Spent slurry was analyzed for its possible use as biomanure for plant production and results revealed a considerable amount (g kg(-1)) of total nitrogen (14.07-16.69), total phosphorous (15.76-17.8), total potassium (21.56-24.12) in spent slurry from biochar-amended setups. Carbon-to-nitrogen ratio (14.2-19.6), NH4+/NO3-N (<0.16 g Kg(-1)) ratio, and germination index of spent slurry was also in the acceptable limit as decided for biomanure, indicating its possible utility in plant production. Biochar addition (up to 1%) improves the biomethane contents (4.4-11%) in biogas and nutritional value of spent slurry. This study indicates that weed Eichhornia biomass could be managed effectively by anaerobic digestion for methanerich biogas and biofertilizer production simultaneously under the circular economy model. (C) 2020 Elsevier B.V. All rights reserved. |
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