生物沥浸法去除不同初始pH值猪粪中的重金属

试验研究了不同初始pH值下猪粪中Cu、Zn和Cd的生物沥浸效果,结果表明猪粪生物沥浸对初始pH值的要求并不严格,具有较广的适用范围。猪粪粪液即使在初始pH值为8的弱碱性条件下,其pH值也可随沥浸时间快速降低,生物沥浸12天降到1.37,Cu、Zn和Cd沥出率可达到90.76%、97.97%和80.45%。初始pH值对重金属的沥浸速率有一定影响,降低初始pH值可以缩短生物沥浸周期,重金属的沥浸周期受不同初始pH值的影响程度从大到小依次为:CuZnCd。初始pH值为5的猪粪粪液可以在9天内完成生物沥浸,Cu、Zn和Cd沥出率可达到93.83%、99.24%和70.98%

Bioleaching of Heavy Metals from Pig Manure with Different Initial pH

Influence of different initial pH value on removal effect of heavy metals from pig manure by bioleaching technique was studied. Results showed that scope of initial pH value favorable for bioleaching of pig manure is wider. Even under weak alkaline condition with initial pH of 8, pH value of pig manure liquid can also decrease rapidly with bioleaching time, which decreases to 1.37 in the first 12d of bioleaching, with bioleaching rate of Cu, Zn and Cd up to 90.76%, 97.97% and 80.45% respectively. Initial pH value has a certain influence to bioleaching speed, decreasing initial pH value can shorten the bioleaching process. According to the reduction of influence extent of initial pH to bioleaching process, the order of heavy metals is ranked as Cu, Zn and Cd. Pig manure liquid with initial pH of 5 can finish bioleaching process in 9d, with bioleaching rate of Cu, Zn and Cd up to 93.83%, 99.24% and 70.98% respectively.