SUN Qing-hua,ZHANG Xiao-xia,ZHAO Yi-hua,et al.Design of a Wastewater Treatment Plant Upgrading Project with High Salinity Influent and High Discharge Standard in Tianjin[J].China Water & Wastewater,2021,37(8 8):83-89.
Design of a Wastewater Treatment Plant Upgrading Project with High Salinity Influent and High Discharge Standard in Tianjin
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
8 8
Page:
83-89
Column:
Date of publication:
2021-04-17
- Keywords:
- high salinity wastewater; high discharge standard; upgrading and reconstruction; MBBR; Bardenpho; advanced oxidation
- Abstract:
- The treatment capacity of a coastal wastewater treatment plant (WWTP) in Tianjin is 10×104 m3/d, and the influent contains high salinity. In 2017, upgrading and reconstruction of the WWTP was carried out, and the effluent water quality was required to meet level A limitations of Tianjin local Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (DB 12/599-2015). The WWTP faced with problems as follows: high influent total salinity inhibiting biological system, poor denitrification capacity of biochemical tanks with limited footprint, low influent water temperature inhibiting nitrification, high content of refractory organic matter and difficulty in meeting COD discharge limitation. The modified Bardenpho-MBBR process was selected to upgrade the biochemical tank in situ to strengthen the denitrification performance of the system and improve the impact resistance of the biochemical section to high salinity wastewater. A new ozone catalytic oxidation system was selected to improve the removal ability of refractory organic matter. After the reconstruction, all the control indexes reached the discharge limitations stably, and the denitrification capacity of the system was greatly improved. TN and ammonia nitrogen in the effluent were less than 8.0 mg/L and 1.5 mg/L, respectively, and COD was always less than 30 mg/L, indicating that good removal performance was obtained.
Last Update:
2021-04-17