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首页> 外文期刊>Bulletin of the National Research Centre >Physiochemical Treatment of Final Tannery Wastewater Effluent - A Case Study
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Physiochemical Treatment of Final Tannery Wastewater Effluent - A Case Study

机译：制革废水最终物化处理的案例研究。

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Tanning industry generates hazardous wastewater with high concentration of: solids, colloids, Cr~(3+), chemicals, COD and BOD-5. In the present case-study a medium-size tanning workshop, namely "El-Radio", was selected for investigation. The wastewater is discharged directly into the domestic sewer-network without any treatment. The aim of this work is to investigate the economic alternatives for simple treatment inside the workshop, in order to reduce the high pollution-load to be within the limits of the biological-treatment process, which is covered by the Egyptian government. Coarse filtration - as a pretreatment step reduced the solids with about 20%, and COD by about 17%, while chromium ions decreased by about 15%. The Jar-test experiments were carried out at different operating conditions, and by using of both inorganic and organic coagulants. Aluminium sulfate and ferric chloride were selected as inorganic coagulants, while commercial available polymers (nonionic, anionic and cationic) were used as organic coagulants. The Jar-test experiments proved that the nonionic polymer is more effective rather than other coagulants. A dose of 2.5 ppm of nonionic polymer was suitable to reduce the S.S. by about 96%, COD by about 70%, and Cr~(3+) by about 75%. The next acidification and neutralization of treated effluent was useful to reduce the load within the national limits. The obtained results have been discussed and evaluated in order to specify the design criteria of in future pilot-scale unit.
机译：制革业产生的有害废水的浓度很高：固体，胶体，Cr〜（3+），化学药品，COD和BOD-5。在本案例研究中，选择了一家中型制革车间“ El-Radio”进行调查。废水未经任何处理直接排入生活污水管网。这项工作的目的是研究在车间内进行简单处理的经济方法，以将高污染负荷减少到生物处理过程的极限之内，这是埃及政府所涵盖的。粗滤-作为预处理步骤，固体减少约20％，COD减少约17％，而铬离子减少约15％。 Jar测试实验是在不同的操作条件下进行的，同时使用了无机和有机混凝剂。硫酸铝和氯化铁被选作无机凝结剂，而市售的聚合物（非离子，阴离子和阳离子）被用作有机凝结剂。 Jar测试实验证明，非离子聚合物比其他混凝剂更有效。 2.5ppm的非离子聚合物的剂量适合使S.S.降低约96％，COD降低约70％，而Cr（3+）降低约75％。处理后的废水的下一次酸化和中和有助于将排放量降低到国家规定的范围内。为了确定未来中试规模单元的设计标准，已经对获得的结果进行了讨论和评估。

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