不同pH值下 Fe3+对好氧活性污泥处理制浆中段废水的影响
2018-10-21王玥婷兰善红
王玥婷 兰善红
摘要:本课题以不加Fe3+的活性污泥作为对照,探讨了在Fe3+存在下,pH值对好氧活性污泥处理制浆中段废水的影响。研究表明,当pH值为65时,对照组和添加Fe3+的实验组的CODCr去除率分别达到77%和79%。当超出该pH值范围,对照组和实验组的CODCr去除效果均下降。Fe3+的存在提高了处理效果,特别是pH值明显偏离正常值,pH值为85和95时尤为明显。通过对脱氢酶浓度和污泥絮凝性能的研究结果表明,当pH值在55~75的范围时,两个指标都显示了污泥良好的性能,但在其他pH值条件下,污泥活性和絮凝性能均出现下降。与对照组相比,Fe3+的存在提高了污泥的活性和絮凝性能。
关键词:pH值;制浆中段废水;好氧活性污泥;Fe3+
中图分类号:X7035文献标识码:ADOI:1011980/jissn0254508X201803003
收稿日期:20171204(修改稿)
基金项目:广东省教育厅自然科学项目(2015KTSCX140)。
*通信作者:兰善红,博士,教授;主要从事水污染处理技术的研究。Effect of Fe3+ on Pulping Middlestage Effluent Treatment by
Aerobic Activated Sludge under Different pH ValuesWANG YuetingLAN Shanhong*
(School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, Guangdong Province,523808)
(*Email: llsshhh@163com)
Abstract:Effect of pH on treatment of pulping middlestage effluent(PMSE)by aerobic activated sludge in the presence of Fe3+ was studied, with sludge without Fe3+ as blank control COD removal efficiencies of experiment groups with and without Fe3+ achieved 77% and 79% respectively, when pH was 65, but the treatment effect decreased when pH value was out of this range The present of Fe3+enhanced the treatment effect, especially when pH deviated from the normal value, eg 85 and 95 The dehydrogenase concentration and the flocculation ability of the sludge were also studied The results showed that the two indicators in both groups were good when pH value in the range of 55~75, but deterioration occurred at other pH values Compared to the blank control, both the activity and flocculation ability of the sludge with Fe3+ were better.
Key words:pH valves; pulping middlestage effluent; aerobic activated sludge; Fe3+
好氧活性污泥工藝是处理工业废水的成熟工艺,但该工艺存在污泥膨胀问题,据前人研究这主要是因为溶解氧不足导致丝状菌过度生长[1]。另外,pH值也是好氧活性污泥系统正常运行的关键因素。
在好氧活性污泥脱氮过程,pH值低于60时,硝化过程受到抑制[2]。在除磷过程中,pH值需要保持在中性范围,偏酸或偏碱的条件均会导致处理效果变差[3]。有研究表明[4],好氧活性污泥系统运行的合适pH值为中性,超出该范围会抑制微生物活性,从而进一步影响废水的处理效果。
pH值不仅影响微生物活性,而且影响污泥理化特性,如污泥沉降性能。……
