Effect of Influent Carbon-phosphorus Ratio on Sludge Sedimentation and Nitrogen and Phosphorus Removal in SBR System

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Effect of Influent Carbon-phosphorus Ratio on Sludge Sedimentation and Nitrogen and Phosphorus Removal in SBR System

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[1]PENG Zhaoxu,WANG Ju,LOU Tianyu,et al.Effect of Influent Carbon-phosphorus Ratio on Sludge Sedimentation and Nitrogen and Phosphorus Removal in SBR System[J].Journal of Zhengzhou University (Engineering Science),2022,43(06):77-82.[doi:10.13705/j.issn.1671-6833.2022.03.012]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 43卷 Number of periods: 2022 06 Page number: 77-82 Column: Public date: 2022-09-02

Title:: Effect of Influent Carbon-phosphorus Ratio on Sludge Sedimentation and Nitrogen and Phosphorus Removal in SBR System

Author(s):: PENG Zhaoxu; WANG Ju; LOU Tianyu; JIANG Kun; NIU Ningqi; School of Water Conservancy and Engineering, Zhengzhou University, Zhengzhou 450001, China

Keywords:: phosphorus shock loading; activated sludge; SBR reactor; nitrogen and phosphorus removal; sludge settleability

CLC:: X773

DOI:: 10.13705/j.issn.1671-6833.2022.03.012

Abstract:: In order to explore the impact of phosphorus shock load on the characteristics of activated sludge system, the anaerobic aerobic SBR was used for experiments. By changing the influent phosphorus content, the pollutant removal characteristics and sludge sedimentation performance of activated sludge system were investigated in the conditions of influent carbon-phosphorus ratios of 330/8, 330/12, 330/16, 330/20. The results showed that the decrease of carbon-phosphorus ratios could enhance the activity of phosphorus accumulating bacteria, could improve the sludge settleability, and could significantly improve the system′s nitrogen and phosphorus removal performance. When the influent carbon-phosphorus ratios changed from 330/8 to 330/20, the specific phosphorus uptake in the aerobic stage increased from 9.502 mg/g to 17.764 mg/g, increasing by 86.95%. With the impact of increasing phosphorus concentration, the phosphorus accumulating bacteria would absorb more organic matter by anaerobic phosphorus releasing, and the experimental effluent quality will be improved. During the anaerobic period, the pH decreasing rate was significantly correlated with the phosphorus release rate (R2=0.667), and the pH curve reflected the characteristics of anaerobic respiration in the system. ORP decreased continuously in the anaerobic stage, and two platform appeared in the aerobic stage. The change process of PO43--P concentration could be indicated by online monitoring of ORP changes, and the time point of the end of anaerobic phosphorus release could be determined. When the influent COD remained unchanged, increasing the influent phosphorus concentration could enhance the microbial activity, improve the sludge sedimentation performance and the system′s nitrogen and phosphorus removal performance, which would have a favorable impact on the activated sludge system.

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Last Update: 2022-10-03