摘要
以单质硫为能源物质,城市污水厂污泥为菌株来源及培养基主要成分来培养氧化硫硫杆菌。取100mL氧化硫硫杆菌菌液用于浸取15g废弃电路板粉末中的铜,反应到预设时间后进行固液分离,另取100mL氧化硫硫杆菌菌液用于继续浸取剩余固体中的铜,考察不同浸取频次对铜累计浸取率的影响。研究结果表明,随着浸取频次的增加,铜累计浸取率逐渐提高。耗时24d,浸取频次分别为3、4、6、12、24次中,浸取24次的铜累计浸取率最高,为93.69%,其次是浸取12次的,铜累计浸取率为91.18%。虽然浸取24次的铜累计浸取率比浸取12次的高,但是前者在耗时24d后产生的浸取液(2.4L)是后者(1.2L)的2倍,考虑到微生物培养及后续处理成本,所以最佳浸取频次为12次。
Thiobacillus thiooxidans isolated from sewage sludge was acclimated with the elemental sulfur as substrate and then employed for leaching of copper from pulverized printed circuit board（PCB）particles （〈75 mesh, Cu of 94.78%）. 100 mL of the acidic effluent （pH：1. 5-2.0） from acidifying reactor was fed to the leaching reactors which respectively contained 15 g pulverized PCB particles. The initial leaching was respectively completed after 1, 2, 4, 6 and 8 d. Subsequently, 100 mL of fresh acidic effluent was respectively employed for leaching copper from solid residue in the leaching reactors after the solid-liquid separation. This operation was repeated successively for 24 d. The effect of different leaching times on the leaching efficiency was evaluated. After a contacting period of 24 d, the leaching of 24 times was able to mobilize total copper by 93.69%, 12 times by 91.18%0, and 6, 4, 3 times were by less than 70%. Because the leaching of 12 times was able to leach 91.18% of the available copper after a contacting period of 24 d with the less amount of effluent produced than 24 times, taking into account the costs of microbe cultivation and subsequent treatment, the leaching of 12 times was more appropriate than 24 times.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2008年第11期27-30,34,共5页
Environmental Pollution & Control
基金
国家"863计划"项目(No.2006AA06Z132)
教育部科学技术研究重点项目(No.107124)
上海市重点学科资助项目(No.B604)
关键词
废弃电路板
微生物浸取
氧化硫硫杆菌
铜
wasted printed circuit board
bioleaching
Thiobacillus thiooxcidans
copper
