| Enhanced chromium recovery from tanning wastewater | |
| Guo, ZR ; Zhang, GM ; Fang, JD ; Dou, XD | |
| 2010-05-11 ; 2010-05-11 | |
| 关键词 | Cr tanning wastewater chemical precipitation sonication microwave irradiation MEMBRANE PROCESSES SLUDGE ULTRASOUND INDUSTRY SYSTEM SCALE Engineering, Environmental Environmental Sciences |
| 中文摘要 | A large volume of tanning wastewater was generated with a Cr3+ concentration of 3000-6000 mg/L. The prevailing method for Cr3+ recycle is NaOH precipitation, which is severely limited by the poor sedimentation of the sludge formed. Therefore, bridging cations, Ca2+ and Mg2+ and sonication were used to enhance the sedimentation of the precipitate. Microwave irradiation was employed to improve the re-dissolution of Cr-sludge for reuse. All alkalis effectively removed Cr3+ from the aqueous phase with a removal of higher than 99% and a recovery of similar to 60%. The substitution of NaOH with CaO or MgO resulted in much less sludge and shorter sedimentation time. MgO also enhanced the purity and dewatering capability of the sludge. The best alkali was a mixture of CaO and MgO (4:1, by weight) to balance the cost and performance. COD and SS were removed in the process via sweeping by the precipitate with removal percentages of 47.6% and 86.3%, respectively. Two minutes sonication at 0.12 W/cm(3) greatly accelerated the sludge sedimentation, cutting the settling time from 3 h to I h. Sonication did not alter the particle size or purity of the sludge. Microwave irradiation of 5 min increased the Cr recovery ratio from 60% to 80%. (c) 2005 Elsevier Ltd. All rights reserved. |
| 语种 | 英语 ; 英语 |
| 出版者 | ELSEVIER SCI LTD ; OXFORD ; THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND |
| 内容类型 | 期刊论文 |
| 源URL | [http://hdl.handle.net/123456789/26336]  |
| 专题 | 清华大学 |
| 推荐引用方式 GB/T 7714 | Guo, ZR,Zhang, GM,Fang, JD,et al. Enhanced chromium recovery from tanning wastewater[J],2010, 2010. |
| APA | Guo, ZR,Zhang, GM,Fang, JD,&Dou, XD.(2010).Enhanced chromium recovery from tanning wastewater.. |
| MLA | Guo, ZR,et al."Enhanced chromium recovery from tanning wastewater".(2010). |
| 个性服务 |
| 查看访问统计 |
| 相关权益政策 |
| 暂无数据 |
| 收藏/分享 |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
修改评论