HONGYi-yi-hui,HEQiang,HUANGFUXiao-liu,et al.Phosphorus Removal Characteristics of Chemicals in Municipal Wastewater Treatment Plants[J].China Water & Wastewater,2023,39(9):18-25.
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Phosphorus Removal Characteristics of Chemicals in Municipal Wastewater Treatment Plants

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第9期 Page: 18-25 Column: Date of publication: 2023-05-01
Author(s):
HONG　Yi-yi-hui1; 2;  HE　Qiang1; 2;  HUANGFU　Xiao-liu1; 2;  WANG　Xin-ge1; 2
（1. Key Laboratory of the Three Gorges Reservoir Region’s Eco?Environment ， Chongqing University， Chongqing 400044， China； 2. College of Environment and Ecology， Chongqing University， Chongqing 400044， China）
Keywords:
wastewater treatment plant;  chemical-aid phosphorus removal;  anaerobic phosphorus release;  return sludge
Abstract:
In five municipal wastewater treatment plants with chemical-aid phosphorus removal, the effects of chemicals on phosphorus removal performance were evaluated by investigating the phosphorus removal behavior and the contribution ratio of different forms of iron to phosphorus removal. At low dosage of Fe3+ calculated by molar equivalent (0.88), the microorganisms had a certain anaerobic phosphorus release ability [0.103 mg/(gMLVSS·h)]. However, when the molar equivalent of Fe3+ dosage was 1.79, the anaerobic phosphorus release ability of the microorganisms was basically lost, indicating that the anaerobic phosphorus release activity decreased gradually with the increase of Fe3+ dosage molar equivalent in the range of 0.88-1.79. Al3+ had an obvious inhibitory effect on anaerobic phosphorus release, and the inhibitory effect was enhanced with the increase of Al3+ dosage molar equivalent. In addition, the analysis results of phosphorus and iron components in sludge showed that phosphorus bounding to iron was the main form of phosphorus in sludge, and the residual Fe3+ hydrolyzed to form iron oxides which produced strong precipitation and adsorption on phosphate with the continuous accumulation of Fe3+ in the system. In general, although the anaerobic phosphorus release ability decreased with the increase of Fe3+ concentration, the adsorption of phosphate on hydrolyzed iron oxide was the main reason for the decrease of phosphate concentration in the anaerobic stage of wastewater treatment plant.
Last Update: 2023-05-01