摘要
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.
出处
《江苏农业学报》
CSCD
北大核心
2008年第6期948-953,共6页
Jiangsu Journal of Agricultural Sciences
基金
江苏省科技厅太湖治理专项(BS2007147)
江苏省农业自主创新项目(BM2008009)
关键词
蓝藻
沼气
复合折流板反应器
藻毒素
blue algae
methane
anaerobic baffle reactor(ABR)
microcystins