| 生物沥浸对牛粪沼液脱水性能的影响研究 |
| 摘要点击 4888 全文点击 2642 投稿时间：2010-12-14 修订日期：2011-03-09 |
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| 中文关键词 生物沥浸 沼液 硫杆菌 脱水性能 重金属 |
| 英文关键词 bioleaching biogas slurry Acidophilic thiobacilli dewaterability heavy metals |
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| 中文摘要 |
| 采用嗜酸性硫杆菌，通过摇瓶试验研究了不同硫杆菌及其复合生物沥浸对含固率为3.4%的沼液脱水性能的影响.设置了如下5个处理：①原始沼液（作对照）；②4 g·L-1 Fe2+（不接菌）；③2 g·L-1S0 +25 mL A.t ；④4 g·L-1Fe2++25 mL A.f ；⑤2 g·L-1S0 +4 g·L-1 Fe2++12.5 mL A.t +12.5 mL A.f .考察了不同的处理生物沥浸过程中的pH、Fe2+、Fe3+ 、总Fe、比阻、毛细吸水时间（CST）、沉降性能及沉降12 h后上清的浊度等的变化.结果表明，原始沼液+Fe2+、原始沼液+Fe2++A.f 和原始沼液+Fe2++S0 +A.f +A.t 这3个处理沼液的比阻和CST都得到了不同程度的降低，综合沼液的脱水性能、沉降性能以及沉降12 h后的上清液浊度，结合经济成本分析，建议选择原始沼液+Fe2++A.f 作为沼液生物沥浸处理比较合理.生物沥浸后沼饼中的有机质、N、P、K的含量分别降低了1.14%、 0.09%、 0.05%、 0.1%，不影响肥效，对沼饼中的重金属Cu、Zn的去除率分别为63.2% 和91.3%，同时对沼液中的总大肠杆菌的杀灭率超过了99%.可见，生物沥浸技术为沼液的资源化利用提供了一个全新的途径. |
| 英文摘要 |
| The dewaterability of cattle biogas slurry facilitated by bioleaching was investigated through batch experiments with co-inoculation of different Acidophilic thiobacilli (Acidithiobacillus thiooxidans TS6 or Acidithiobacillus ferrooxidans LX5).The experiment was set the following 5 treatments:①original biogas slurry (CK),②4 g·L-1 Fe2+( uninoculation),③2 g·L-1S0 +25 mL A.t ,④4 g·L-1Fe2++25 mL A.f and ⑤2 g·L-1S0 +4 g·L-1 Fe2++12.5 mL A.t +12.5 mL A.f .During bioleaching,dynamic changes of pH,ORP,Fe2+,Fe3+ ,total Fe,the settleability,the turbidity of the supernatant after settling for 12 h,and the dewaterability (expressed as specific resistance to filtration γ or capillary suction time,CST) of biogas slurry were monitored.Results show that specific resistance γ and CST of bioleached biogas slurry are reduced drastically for the treatments of original biogas slurry spiked with only Fe2+,the treatment of original biogas slurry co-spiked with Fe2+ and Acidithiobacillus ferrooxidans LX5,and the treatment of original biogas slurry co-spiked with Fe2+,S0 and two Acidophilic thiobacilli.Taking the dewaterability,settleability,the turbidity of the supernatant fluid after settle 12 h and economical cost into account,the treatment of original biogas slurry co-spiked with Fe2+ and Acidithiobacillus ferrooxidans LX5 is the most suitable pattern for cattle biogas slurry bioleaching.After bioleaching， 1.14% of organic matter， 0.09% of N， 0.05% of P,and 0.1% of K are lost in the bioleaching process,but it don't affect its fertilizer efficiency.Meanwhile,the 63.2% of Cu and 91.3% of Zn are removed from the biogas slurry,and elimination efficiencies of total coliforms in bioleached slurry exceed 99%.This study might provide a new approach for treatment and disposal of biogas slurry. |
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