LIYi-long,BAOYu,DIWen-zheng,et al.Design of Step-feed Multi-stage AO+MBR Process under High Discharge Standard[J].China Water & Wastewater,2022,38(4):76-81.
Design of Step-feed Multi-stage AO+MBR Process under High Discharge Standard
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第4期
Page:
76-81
Column:
Date of publication:
2022-02-17
- Keywords:
- step-feed multi-stage AO; MBR; reclaimed water plant; high discharge standard; ozone catalytic oxidation
- Abstract:
- The original design scale of a reclaimed water plant in Beijing is 4.5×104 m3/d. The plant was newly built in other place and expanded to the design scale of 6.5×104 m3/d in the phase Ⅰ project (the total scale is 10×104 m3/d), and the discharge standard was upgraded from the first level A criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002) to level A criteria (quasi?class Ⅲ standard) specified in a local standard of Beijing Discharge Standard of Water Pollutants for Municipal Wastewater Treatment Plants (DB 11/890-2012). Through analysis of the pollutant indicators and comparison of the process scheme, the process of pretreatment, step-feed multi-stage AO process, MBR and ozone catalytic oxidation was selected. The trial operation indicated that the effluent quality stably met the discharge standard. The step?feed multi?stage AO process flexibly allocated the carbon sources in the influent and improved the endogenous denitrification to enhance TN removal performance. When the influent quality exceeded the standard in actual operation, TN in the effluent still remained below 10 mg/L by adding external carbon source. In addition, precise aeration and pulse aeration systems were applied to the biological tank and membrane tank, which effectively saved energy consumption by approximately 10% during trial operation.
Last Update:
2022-02-17