| 魏孝承,刘东方,廖力锐,王振东,李文姣,杜丽琼,李振东.利用土著硫杆菌生物沥浸去除猪粪中重金属的研究[J].农业环境科学学报,2018,37(11):2594-2602. |
| 利用土著硫杆菌生物沥浸去除猪粪中重金属的研究 |
| Bioleaching of heavy metals from pig manure via indigenous sulfur-oxidizing bacteria |
| 投稿时间：2018-04-24 修订日期：2018-07-03 |
| DOI：10.11654/jaes.2018-0538 |
| 中文关键词: 生物沥浸 猪粪 重金属 硫杆菌 |
| 英文关键词: bioleaching pig manure heavy metals sulfur-oxidizing bacteria |
| 基金项目:国家重点研发计划项目（2016YFD0801002-01）；天津市科技支撑计划项目（201601190） |
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| 中文摘要: |
| 为探讨利用土著硫杆菌去除猪粪中重金属的可行性，通过摇瓶实验探究了初始pH值、初始接种量和温度对生物沥浸去除猪粪中重金属效果的影响，并研究了采用气提式反应器生物沥浸处理猪粪的效果。摇瓶实验研究结果表明，接种土著氧化硫硫杆菌后，28℃下180 r·min-1摇床培养6 d，锥形瓶中猪粪的pH值下降至2左右。生物沥浸10 d，猪粪中Cu、Zn、Mn的浸出率均可达到90%以上。采用气提式反应器进行生物沥浸，初始接种量5%，系统温度30℃±2℃，曝气量2 L·min-1，Cu、Zn、Mn、Cd的最终浸出率分别为91.9%、94.8%、97.9%、92.5%。研究表明，利用土著硫杆菌可以在不进行预酸化的条件下有效去除猪粪中的重金属。 |
| 英文摘要: |
| In this study, the feasibility of employing indigenous sulfur-oxidizing bacteria to remove heavy metals from pig manure was investigated. Batch experiments were conducted to explore the effect of initial pH, inoculation level, and temperature on the bioleaching of heavy metals from pig manure. In addition, an airlift bioreactor was utilized to bioleaching heavy metals from pig manure. The results of the batch experiments showed that adjusting the pH to lower than 4 promoted the solubilization of heavy metals during pig manure bioleaching only slightly. However, increasing the level of inoculation with sulfur-oxidizing bacteria from 0 to 10% significantly accelerated the rates of pH reduction and heavy metal solubilization. Hence, the optimum inoculation volume recommended was 5% (V/V). The results also showed that the temperature significantly influenced the growth of sulfur-oxidizing bacteria and further affected the solubilization of heavy metals. The optimum temperature range for the growth of indigenous sulfur-oxidizing bacteria was 28~38℃. Finally, after 10 days of bioleaching, under the conditions of 28℃ and 180 r·min-1 with inoculation of sulfur-oxidizing bacteria, the solubilization of Cu, Zn, and Mn were all higher than 90%. In addition, when treated in the airlift bioreactor at 30℃±2℃, with an inoculation volume of 5% (V/V)and aeration of 2 L·min-1, 91.9% of the Cu, 94.9% of the Zn, 97.8% of the Mn, and 92.5% of the Cd were leached out from the pig manure after 10 days. These results demonstrate that heavy metals in pig manure can be efficiently removed by indigenous sulfur-oxidizing bacteria without having to pre-acidify the manure. |
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