PAC和PAFC对内循环连续砂滤器处理石化二级出水的影响

发布时间：2019-06-04 18:56

【摘要】：.采用PAC(聚合氯化铝)和PAFC(聚合氯化铝铁)作为絮凝剂,探讨不同絮凝剂及其投量对于内循环连续砂滤器处理效果和滤料板结潜在趋势的影响.结果表明,PAC和PAFC投量由5mg/L升至30mg/L时,COD和SS的去除率随着投加量的增大均呈现出先升高后降低的趋势.10mg/L为试验水质下的最佳投量,在该投量下,PAC对SS和COD去除率为分别为49.7%和12.9%;PAFC对SS和COD去除率分别为50.6%和13.8%.内循环连续砂滤器主要去除的是相对分子量在3k以上的溶解性有机物,但对相对分子量1k以下的溶解性有机物去除效果不好,总DOC去除率低于5%,需进一步深度处理以满足最新的排放标准.PAFC混合液比PAC混合液黏度低,有利于缓解滤料板结.总体来看,更适合于石化二级出水的混凝剂为PAFC,最佳投量为10-15mg/L,可保障对SS高效去除同时并使内循环连续砂滤器运行更加稳定.
[Abstract]:. Using PAC (polyaluminum chloride) and PAFC (polyaluminum iron chloride) as flocculants, the effects of different flocculants and their dosage on the treatment effect of internal circulation continuous sand filter and the potential trend of filter material consolidation were discussed. The results show that when the dosage of PAC and PAFC increases from 5mg/L to 30mg/L, the removal rates of COD and SS increase at first and then decrease with the increase of dosage. 10 mg/L is the best dosage under the experimental water quality. The removal rates of SS and COD by PAC were 49.7% and 12.9%, respectively. The removal rates of SS and COD by PAFC were 50.6% and 13.8%, respectively. The internal circulation continuous sand filter mainly removes dissolved organic matter with relative molecular weight of more than 3k, but the removal effect of dissolved organic matter with relative molecular weight below 1k is not good, and the total DOC removal rate is less than 5%. Further advanced treatment is needed to meet the latest emission standard. PAFC mixture has lower viscosity than PAC mixture, which is beneficial to alleviate the filter material bond. On the whole, the optimum dosage of PAFC, is 10 脳 15 mg 路L, which can ensure the efficient removal of SS and make the operation of internal circulation continuous sand filter more stable.
【作者单位】：大连海洋大学海洋科技与环境学院;中国环境科学研究院水污染控制技术研究中心;兰州交通大学环境与市政工程学院;长安大学环境科学与工程学院;
【基金】：“十二五”国家水体污染控制与治理科技重大专项(2012ZX07201-005) 国家自然科学基金项目(51208484)
【分类号】：X78

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