ZHANG Xiao-xia,XIONG Ren-jiu,ZHOU Jia-zhong,et al.Analysis on Upgrading and Retrofitting Effect of an Industrial Wastewater Treatment Plant in Zhejiang[J].China Water & Wastewater,2021,37(5 5):37-42.
Analysis on Upgrading and Retrofitting Effect of an Industrial Wastewater Treatment Plant in Zhejiang
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
5 5
Page:
37-42
Column:
Date of publication:
2021-03-01
- Keywords:
- industrial wastewater treatment plant; upgrading and retrofitting; moving bed biofilm reactor; simultaneous nitrification and denitrification; suspended carrier
- Abstract:
- An industrial wastewater treatment plant in Zhejiang was upgraded by a combined process consisting of anaerobic/anoxic/oxic activated sludge process and moving bed biofilm reactor (AAO-MBBR). Without changing the footprint and increasing the reactor volume, the treatment capacity increased from 30 000 m3/d to 60 000 m3/d after retrofitting. Concentrations of COD, TP, NH3-N and TN in effluent were (37.7±6.61) mg/L, (0.09±0.03) mg/L, (0.25±0.14) mg/L and (5.87±1.54) mg/L, respectively, which met the first class A standard. Actual operation data indicated that TN removal existed in the aerobic MBBR zone (accounting for 10.36% of total TN removal). Nitrospira was the dominant nitrifying bacteria in the system, and its relative abundance in the suspended carrier and activated sludge was 8.98% and 0.92%, respectively, indicating that the addition of suspended carrier could effectively enrich the nitrifying bacteria. The proportion of denitrifying bacteria on biofilm was 7.94%, which created a microenvironment for the occurrence of simultaneous nitrification and denitrification (SND) in the suspended carrier and improved the TN removal efficiency.
Last Update:
2021-03-01