%0 Journal Article
%T Removal of Cr from Tannery Sludge by Bioleaching in Air-lift Reactor: A Pilot Study<br>空气提升式反应器处理制革污泥的中试研究
%A CHEN Hao
%A ZHOU Li-xiang
%A LI Chao
%A <br>陈浩
%A 周立祥
%A 李超
%J 环境科学
%D 2007
%I 
%X A bioleaching process performed in 280L air-lift reactor was developed for extracting Cr from tannery sludge. Cr removal efficiency under different aeration amount with a range from 1.0 m3/h to 3.0 m3/h was investigated. The results showed that the sludge could be homogeneous quickly for different aeration treatment even if aeration amount was as low as 1.0 m3/h. But the obvious effect of aeration amount on pH decrease and subsequent Cr dissolution in tannery sludge during bioleaching was observed. If the aeration amount was below 1.5m3/h , it at least took 90 h to reach 80% Cr removal efficiency. In the light of Cr removal efficiency and energy consume, the aeration amount of 2.0m3/h was considered as an optimum one for bioleaching in this trial. Cr removal efficiency could reach above 92.5% at 72h. In the sludge bioleaching system dissolved oxygen increased obviously with the decrease of pH. Eventually, dissolved oxygen raised to 5mg/L or more when aeration amount was maintained in 2.0m3/h or more. Therefore, it was suggested that the aeration amount in ALR could be adjusted to a lower level in the late stage of tannery sludge bioleaching in order to save operation cost.
%K tannery sludge
%K bioleaching
%K air-lift reactor
%K pilot<br>制革污泥
%K 生物沥浸
%K 空气提升式反应器
%K 中试
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=76A7D92E160A321B&yid=A732AF04DDA03BB3&vid=D3E34374A0D77D7F&iid=9CF7A0430CBB2DFD&sid=549638E6695045E9&eid=5AE24134D11ADFE8&journal_id=0250-3301&journal_name=环境科学&referenced_num=3&reference_num=18