LIUHao,ZANGHai-long,GENGAn-feng,et al.Design of Quasi Class Ⅳ Discharge Standard Upgrading and Expansion Project in Qingdao Licunhe Wastewater Treatment Plant[J].China Water & Wastewater,2023,39(2):52-57.
Design of Quasi Class Ⅳ Discharge Standard Upgrading and Expansion Project in Qingdao Licunhe Wastewater Treatment Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第2期
Page:
52-57
Column:
Date of publication:
2023-01-17
- Keywords:
- quasi class Ⅳ standard; MBR; high-speed air flotation; ozonation
- Abstract:
- The original design scale of Qingdao Licunhe wastewater treatment plant is 25×104 m3/d. To meet the requirements of pollutant reduction and ecological water supplement in Licun River basin, the scale of phase Ⅳ project has to expand to 30×104 m3/d, and the discharge standard should be raised from first level A discharge standard to class Ⅳ surface water standard (except for total nitrogen no more than 15 mg/L). The upgrading and expansion project adopted the construction scheme of capacity reduction, wastewater diversion and capacity expansion of the original plant. The modified process consisting of Bardenpho and MBR was adopted in the-expansion-project. A high-speed air floatation process was added for treating the effluent from the original plant, and it was oxidized by ozone and disinfected together with the effluent from the MBR before discharge. In addition, the construction method of semi-underground full coverage was adopted in the new plant to reduce-the “not in my backyard” conflict. Since the completion and operation of the project, the effluent indexes were better than the design indexes under the condition of large influent shock load. In the meantime, the project provided the maximum 20×104 m3/d of ecological water supplement for the upstream of Licun River, which achieved good ecological and social benefits.
Last Update:
2023-01-17