WANGGang,LIKui-xiao,WANGWei,et al.Effects of Phosphorus Form and Suspended Solids Content on Phosphorus Concentration in Reclaimed Water[J].China Water & Wastewater,2023,39(11):109-114.
Effects of Phosphorus Form and Suspended Solids Content on Phosphorus Concentration in Reclaimed Water
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第11期
Page:
109-114
Column:
Date of publication:
2023-06-01
- Keywords:
- reclaimed water; phosphorus form; suspended solid; soluble non?reactive phosphorus; particulate total phosphorus
- Abstract:
- To meet the requirement of increasingly strict standard of phosphorus concentration in effluent from reclaimed water plant, the influence of phosphorus form and suspended solids content on phosphorus concentration in reclaimed water was investigated. Soluble non-reactive phosphorus (sNRP) and particulate total phosphorus (pTP) were the key factors that affected the reclaimed water to reach the extreme low phosphorus concentration. After biochemical treatment, the concentrations of sNRP and pTP in reclaimed water were 0.06 mg/L and 0.04 mg/L, respectively. Among them, sNRP was difficult to remove, chemical phosphorus removal had no obvious performance, and excessive usage of phosphorus removal agents would lead to the increase of aluminum ion concentration in water. When the dosage of aluminum sulfate was 20 mg/L, the residual aluminum ion concentration in water was as high as 55.4 ug/L. The concentration of pTP was proportional to the suspended solids (SS) in reclaimed water. The phosphorus concentration in SS ranged from 27 mg/g to 43 mg/g. The higher SS resulted in the higher pTP in effluent, which led to the increase of total phosphorus in effluent. In addition, the phosphorus concentration in SS was positively correlated with the biological phosphorus removal performance and sludge retention time of the reclaimed water plant. In view of the current treatment technology of the reclaimed water plant, reducing effluent SS was the most effective way to achieve the ultimate low phosphorus concentration in the reclaimed water. During the operation of the reclaimed water plant, SS in the effluent should be controlled to be less than 1 mg/L, and thus the total phosphorus of the reclaimed water was less than 0.05 mg/L, so as to reduce the risk of algal bloom caused by excessive phosphorus in the reclaimed water.
Last Update:
2023-06-01