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.
Analysis of Scale Formation of Aerator Based on Langelier Index
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第11期
Page:
13-18
Column:
Date of publication:
2022-06-01
- Keywords:
- wastewater treatment plant; aerator; scaling; Langelier saturation index(LSI); multiple regression
- 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.
Last Update:
2022-06-01