State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China.
Bioresour Technol. 2020 Aug;310:123417. doi: 10.1016/j.biortech.2020.123417. Epub 2020 Apr 20.
The anaerobic biodegradability of lignocellulosic crop waste could be improved by proper pretreatments, but little information is available on enhancing straw digestibility through the reactor configuration. In a lab-based batch experiment, a novel reactor was established to testify the possibility to enhance anaerobic biodegradability of corn stover (CS) by coupling a self-sustaining air flotation screening (SAFS) unit with conventional continuous stirred tank reactor (CSTR). The SAFS-CSTR improved the maximum methane production by 14.27% with the duration of 16 d compared with the conventional CSTR for 20 d. The temporal and spatial distribution of basic indexes significantly differed from conventional CSTR. Elevated bacterial diversity and marked shifts in bacterial community composition were observed in different locations of reactor, with Bacteroidetes and Proteobacteria being the dominant phyla. SAFS unit would serve to separate inhibitors effectively and meanwhile enhance the mass-transfer efficiency, thus providing reference to upgrade or retrofit the conventional CSTR.
木质纤维素作物废弃物的厌氧生物降解性可以通过适当的预处理得到提高，但通过反应器构型来提高秸秆消化率的信息却很少。在基于实验室的分批实验中，建立了一种新型反应器，通过将自维持空气浮选筛选（SAFS）单元与传统连续搅拌槽式反应器（CSTR）耦合，验证了提高玉米秸秆（CS）厌氧生物降解性的可能性。与传统 CSTR 相比，SAFS-CSTR 可在 16 天内将最大甲烷产量提高 14.27%，而传统 CSTR 则需要 20 天。不同反应器位置的基础指标的时间和空间分布明显不同，与传统 CSTR 相比，细菌多样性升高，细菌群落组成发生明显变化，拟杆菌门和变形菌门是主要的门。SAFS 单元可有效分离抑制剂，同时提高传质效率，为传统 CSTR 的升级或改造提供参考。
