太湖蓝藻产沼气潜力及复合折流板反应器(ABR)工艺中试

Potential of Methane Production of Blue Algae and Its Feasibility of Fermentation with Anaerobic Baffled Reactor

采用批次发酵方式研究了太湖蓝藻产沼气潜力，并进行了理论值推算。同时采用复合折流板反应器（ABR）工艺，进行了太湖蓝藻厌氧发酵的中试运行，以评估ABR工艺处理蓝藻的可行性。研究结果表明，在35℃、发酵60d条件下，蓝藻实际TS（总固体）产气潜力为378．61ml／g、VS（挥发性固体）产气潜力为410．80mL／g，发酵前15d，产气量占到总产气量的60％以上，化学需氧量（COD）去除率达到46．7％。中试运行结果表明：在有机负荷为10000～30000mg／L、外界气温28℃左右、水力停留时间（HRT）为10d的条件下，COD去除率平均达到65％左右，pH值较稳定；而当外界温度下降后，延长HRT至20d，COD去除率降低至45％左右。此外，中试发酵沼液中的藻毒素（MC-RR、MC-LR）含量，均低于世界卫生组织（WHO）已制定的基准值（1μg/L），表明厌氧发酵处理可以达到蓝藻无害化处理的目的。

The theoretical and practical potential of methane production of blue algae from Taihu Lake were investigated using batch anaerobic fermentation method; meanwhile,a pilot-scale experiment was conducted to investigate the feasibility of anaerobic fermentation of blue algae using ABR （ anaerobic baffled reactor） method. The practical potential of methane production of blue algae total solid from the Taihu Lake was 378.61 ml/L, and the practical potential of methane production of blue algae volatile solid from the Taihu Lake was 410. 80 ml/L at 35℃ for 60 d fermentation. In the first 15 d,the volume of methane production accounted for more than 60% of total methane production and the reduction rate of COD （chemical oxygen demand） reached 46. 7%. The results of pilot-scale experiment indicated that the reduction rate of COD was about 65% on average and the value of pH was stable under the organic load between 10 000 to 30 000mg/L, with the outside temperature around 28℃,and the HRT （hydraulic retention time） of 10 d. However,the reduction rate of COD decreased to 45% when the outside temperature decreased and the HRT doubled. In addition, the contents of microcystins （MC-RR, MC-LR） in the biogas slurry were lower than the values recommended by World Health Organization （WHO）, indicating that the anaerobic fermentation can be used for blue algae disposal.