CHEN Hao-lin,PENG Yi,AN Dong,et al.Diagnosis and Control of Sludge Bulking in Step-feed Multi-stage A/O Process[J].China Water & Wastewater,2021,37(20 20):92-98.
Click Copy

Diagnosis and Control of Sludge Bulking in Step-feed Multi-stage A/O Process

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第37卷 Number: 20 20 Page: 92-98 Column: Date of publication: 2021-10-17
Author(s):
CHEN Hao-lin1; 2; PENG Yi1; 2; 3; AN Dong1; 2; SUN Zhe1; 2; LU Xian-chun2; DENG Long4
(1. Beijing Xintong Bishui Reclaimed Water Co. Ltd., Beijing 101149, China; 2. SDIC Xinkai Water Environment Investment Co. Ltd., Beijing 101101, China; 3. Sichuan Rongxinkai Engineering Design Co. Ltd., Chengdu 610041, China； 4. Guiyang Nanming Zhuxiu Water Environmental Industry Co. Ltd., Guiyang 550000, China)
Keywords:
multi-stage A/O; sludge bulking; filamentous bacteria; sludge loading; process control
Abstract:
In view of the sludge bulking phenomenon in the step-feed multi-stage A/O process of a municipal wastewater treatment plant in north China, the possible causes of sludge bulking in the system are analyzed in combination with the characteristics of the multi-stage A/O process. By field sampling, sludge characteristics observing, microscopic examination of biological phase and balance calculation of process parameters along the process, the causes of sludge bulking are found to be sudden drop of water temperature, low DO concentration, high MLSS and low sludge load. In order to reduce the influence of sludge bulking on system disorder and effluent quality, the measures such as adding chemicals, adjusting aeration rate, increasing sludge discharge, adjusting reflux ratio and influent flow distribution ratio were adopted to gradually restore the stability of the biochemical system and the function of carbon, nitrogen and phosphorus removal.
Last Update: 2021-10-17