| 磷酸废水封闭循环处理的实验研究 |
| 摘要点击 735 全文点击 890 投稿时间：1994-04-24 |
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| 中文关键词 磷酸 废水处理 封闭循环系统 |
| 英文关键词 phosphoric acid wastewater treatment enclosed-circulation |
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| 中文摘要 |
| 本法由4个化工单元操作组成:旋流离心分离、絮凝、重力沉降和混合稠浆过滤。实验结果表明:第1级旋流离心分离效率在80%以上。第2级含固相细粒的旋流溢流采用絮凝预处理后,沉降速度提高近30倍,清液含固量在200×10-6以下。1、2级稠浆在混合比为1.5可达良好的过滤性能。本实验结果为磷酸废水封闭循环处理工艺设计、设备设计,以及操作控制提供了理论依据。 |
| 英文摘要 |
| n enclosed circulation system comprising four operation units,i. e.,spiral flow centrifuge separation, flocculation, gravity settling, and mixed thick sludge filtration, has been developed for the treatment of wastewater from a wet process of phosphoric acid production. The results from a pilot study on this system show that the spiral flow centrifuge separation in stage 1 had an efficiency of over 80%.The overflow containing fine solid particles from the spiral flow process in stage 1 was subject to a flocculation pretreatmentin stage 2, allowing the settling rate to be increased by near 30 times and the supernatant tocontain less than 200 ppm of solid. The thick sludge from stage 1 and that from stage 2 were mixed at a ratio of 1.5, resulting in a good performance of filtration. |
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