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Outline
To improve the stability and methane production efficiency of an anaerobic co-digestion system treating high-load food waste (FW) and waste activated sludge (WAS), a 300-mesh metal mesh dynamic membrane bioreactor (DMBR) and an anaerobic continuous stirred tank reactor (CSTR) were operated in parallel under a high organic loading rate (OLR of 22.8g COD/(L·d)). The long-term performance and microbial community characteristics were compared between continuous and intermittent feeding modes. Results showed that at the same OLR, the continuously fed DMBR achieved a higher methane production rate of (8.86±0.29) L/(L·d) and a methane yield of (407±13) mL/g COD, representing an improvement of approximately 12% over intermittent feeding modes and 22% over the intermittently fed CSTR. It also maintained more stable pH levels and exhibited superior degradation capacity, demonstrating enhanced resistance to organic loading shocks. The dynamic membrane effectively retained and enriched key functional microorganisms, including syntrophic bacteria (Treponema, Lutispora, Syntrophomonas) and hydrogenotrophic methanogens (Methanoculleus). Their relative abundances were significantly higher than those in the conventional CSTR, which considerably accelerated the conversion of organic substrates. However, continuous feeding resulted in a lower membrane flux of 0.0079L/(m2·h) and a more rapid increase in transmembrane pressure (TMP) at 0.98kPa/h. In contrast, intermittent feeding maintained a higher membrane flux of 0.025L/(m2·h), though with slightly lower gas production efficiency. Taking into account overall system performance, including methane yield and operational stability, the DMBR system operated with continuous feeding and intermittent discharge significantly enhances methane conversion efficiency and process stability in high-load FW and WAS co-digestion. This offers an effective intensification strategy for the efficient and stable operation of practical high-load anaerobic co-digestion systems.
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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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