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Outline
In response to the combined inhibition effects of sodium salt, heavy metals and antibiotics in the practical application of high-load anaerobic co-digestion (AcoD) of food waste (FW) and waste activates sludge (WAS), a series of batch experiments were conducted to investigate the individual and combined inhibitory effects of sodium salt (1~16g Na+/L), zinc ion (180~900mg Zn2+/L) and ciprofloxacin (5~60mg CIP/L) on the freshly discharged sludge and room temperature stored sludge from the high-load AcoD system. The results of single inhibition batch experiments indicated that the inhibition strengths of the three inhibitors on methanogenic efficiency were in the following order: CIP > Zn2+ > Na+. Furthermore, the results of the combined inhibition tests showed that the combined inhibition rate of high concentrations of Na+, Zn2+ and CIP was as high as 97.8% for the freshly discharged sludge. However, the combined inhibition rates were reduced to 74.4%~92.2% for the stored sludge under the room temperature. The reasons for the differences between the fresh sludge and storage sludge suffering three inhibitors may be due to the formation of more extracellular polymers for the stored sludge under room temperature. Meanwhile, the room temperature storage condition also changed the interaction patterns of the three inhibitors. The results of high-throughput microbial sequencing showed that Methanosarcina spp. with a small change in relative abundance (96.0%) and Firmicutes with an increase in relative abundance (31%~54.1%) in the sludge after room-temperature storage significantly enhanced the combined inhibitory thresholds of the three inhibitors, providing a better way to enhance the stability regulation of high-load AcoD in the coexistence of multiple inhibitors.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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