Nitrogen removal efficiency and mechanisms of an improved anaerobic-anoxic–oxic system for decentralized sewage treatment

Xie, Yadong; Zhang, Qionghua; Wu, Qi; Zhang, Jiyu; Dzakpasu, Mawuli; Wang, Xiaochang C.

doi:10.1016/j.biortech.2023.129976

Cited by 4 publications

(1 citation statement)

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“…As the industrialization process rapidly develops, wastewater treatment technology has also made corresponding progress [5]. In recent years, the emergence of technologies such as anaerobic-oxic (AO), anaerobic-anoxic-oxic (AAO), oxic-hydrolytic and denitrification-oxic (OHO) and oxichydrolytic and denitrification-hydrolytic and denitrification-oxic (OHHO) indicates that human understanding of the wastewater solution properties (WSPs) has become increasingly profound [6][7][8][9]. To ensure the effective treatment of industrial wastewater with complex, high-concentration, and highly toxic components, and to reflect the economic value of water resource reuse, it is urgent to design and adopt water treatment technologies that are compatible with the WSPs.…”

Section: Introductionmentioning

confidence: 99%

Process Energy and Material Consumption Determined by Reaction Sequence: From AAO to OHO

He,

Ke,

Wei

et al. 2024

Water

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The anaerobic-anoxic-oxic (AAO) process is one of the most widely used processes for treating industrial organic wastewater, and it has shown significant effectiveness in the removal of organic compounds, as well as denitrification and phosphorus removal. However, for the treatment of industrial organic wastewater, this anaerobic preposition and aerobic postposition process has exposed various limitations. Therefore, for this type of wastewater, the oxic-hydrolytic and denitrification-oxic (OHO) treatment process has been proposed and developed based on the principles of three-sludge separation and fluidization. This study integrated operational data from 203 coking wastewater treatment plants worldwide, and the two-step nitrification-denitrification activated sludge model No.3 (TCW-ASM3) was used for comparative analysis of the pollutant removal efficiency and total operating cost of the AAO process and the OHO process in the face of characteristic pollutants in coking wastewater. The results indicate that the full-scale OHO process achieved removal efficiencies of up to 3784 mg/L for chemical oxygen demand (COD) and 297 mg/L for total nitrogen (TN). The theoretical total cost for OHO and AAO were 9.75 and 14.38 CNY/m3, respectively. The pre-treatment aerobic process effectively reduces the biological toxicity of high-toxicity and refractory industrial wastewater, and the three-sludge system provides a stable living space for functional microorganisms, the combination of multi-mode denitrification processes offers new possibilities for treating similar types of industrial wastewater.

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