WANGJian-li,YAOXiao-yan,GAOFang,et al.Analysis of Scale Formation of Aerator Based on Langelier Index[J].China Water & Wastewater,2022,38(11):13-18.
基于朗格利尔指数解析曝气器结垢研究
- Title:
- Analysis of Scale Formation of Aerator Based on Langelier Index
- Keywords:
- wastewater treatment plant; aerator; scaling; Langelier saturation index(LSI); multiple regression
- 摘要:
- 微孔曝气器是市政污水处理厂常用的气体扩散设备，但长期运行过程中的结垢不仅导致能耗增加，甚至会影响曝气系统的安全运行。为此，选择不同地区的12个污水处理厂，结合对结垢成分和好氧区混合液理化性质的分析，探讨了地域和运行条件对结垢的影响。结果表明，除西南地区外，污水厂曝气器上的主要结垢物质是铁盐。基于朗格利尔指数对曝气器结垢因素进行多元回归分析，发现南方区域的结垢受温度的影响，而总碱度是导致北方区域曝气器结垢的主要因素。根据造成结垢的原因，可选择合适的除磷药剂等措施加以应对。
- Abstract:
- Fine bubble aerators are the common air diffusion devices used in the aerobic area of municipal wastewater treatment plants (WWTPs). During long-term operation, scaling will be formed on the aerators, which may lead to an increase in energy consumption and influences the safe operation of the aeration system. The influencing factors of scaling in different regions and operating conditions were analyzed by characterizing the scaling fouling ingredients and physicochemical properties of mixed liquid in the aerobic zones. The results showed that the scaling on the aerators was constituted of iron, especially ferric phosphate, except WWTPs in the southwest region. The scaling factors of aerators were analyzed by multiple regression based on Langelier saturation index（LSI)，and it was founded that scaling was dominated by temperature in the south while total alkalinity in the north. According to the cause of scaling, the preventive measures such as choosing suitable non-Fe phosphorus removal agents were given.
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