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Volume 40 Issue 5
Jul.  2022
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2022  >  40(5): 141-145,165
JING Yu-shu, MOU Run-zhi, JIANG Yi-ming, LIU Zhang-qing, YANG Yan-dong. REDUCING ENERGY AND CHEMICALS CONSUMPTION OF WASTEWATER TREATMENT PLANTS BY ACCURATE AERATION CONTROL: A CASE STUDY[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 141-145,165. doi: 10.13205/j.hjgc.202205020
Citation: JING Yu-shu, MOU Run-zhi, JIANG Yi-ming, LIU Zhang-qing, YANG Yan-dong. REDUCING ENERGY AND CHEMICALS CONSUMPTION OF WASTEWATER TREATMENT PLANTS BY ACCURATE AERATION CONTROL: A CASE STUDY[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 141-145,165. doi: 10.13205/j.hjgc.202205020
shu

REDUCING ENERGY AND CHEMICALS CONSUMPTION OF WASTEWATER TREATMENT PLANTS BY ACCURATE AERATION CONTROL: A CASE STUDY

doi: 10.13205/j.hjgc.202205020

  • 1. Qingdao Zhangcunhe Water Co., Ltd, Qingdao 266100, China;

  • 2. School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China

  • Received Date: 2021-08-05
    Available Online: 2022-07-02
    Abstract
  • As the main energy consumer in wastewater treatment plants(WWTPs), aeration system has a high potential for energy saving. In this study, an air distribution and control system was introduced into Zhangcunhe WWTP, Qingdao. The efficiency of this system was tested, and its effects on the effluent quality and energy consumption were investigated. The results showed that the dissolved oxygen(DO) concentration in the aeration tank could be maintained within ±0.3 mg/L of the setpoint for longer than two-thirds of the running time. By applying the accurate aeration control, the average concentration of effluent chemical oxygen demand(COD) decreased from 19.6 mg/L to 16.7 mg/L, while those of ammonium and total nitrogen(TN) decreased from 0.37 mg/L to 0.28 mg/L, and from 8.48 mg/L to 7.36 mg/L, respectively. The proportion of days with effluent TN<10 mg/L increased from 79% to 100%, indicating a more stable effluent quality. Besides, the power consumption of the aeration system was reduced by 24.8% while the sodium acetate dosing decreased by 15.1%. Therefore, accurate aeration control is an effective approach to reduce the energy and chemical consumption of WWTPs.
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