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.
磷元素形态及悬浮物含量对再生水磷浓度的影响
- Title:
- Effects of Phosphorus Form and Suspended Solids Content on Phosphorus Concentration in Reclaimed Water
- Keywords:
- reclaimed water; phosphorus form; suspended solid; soluble non?reactive phosphorus; particulate total phosphorus
- 摘要:
- 针对再生水厂出水磷浓度标准限值日趋严格的需求，开展了磷元素形态及悬浮物含量对再生水磷浓度的影响研究。结果表明，溶解性非活性磷（sNRP）和颗粒态磷（pTP）是影响再生水达到极限低磷浓度的关键因素。污水经过生物化学法处理以后，再生水中sNRP和pTP浓度分别为0.06和0.04 mg/L，其中去除sNRP较为困难，化学除磷也无明显效果，且过量使用除磷药剂会导致水中铝离子浓度升高。当硫酸铝投加量为20 mg/L时，水中残余铝离子浓度高达55.4 ug/L。pTP浓度与再生水中悬浮物（SS）浓度成正比，SS中磷浓度为27~43 mg/g，SS越高，出水pTP浓度越高，进而导致出水总磷升高。此外，SS中磷浓度与水厂生物除磷效果和污泥停留时间呈正相关关系，鉴于目前水厂的处理工艺，降低出水SS是再生水达到极限低磷浓度最有效的途径。在水厂运行过程中需要控制出水SS低于1 mg/L，即可实现再生水总磷浓度低于0.05 mg/L，从而降低再生水磷元素超标引起的藻华风险。
- 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.
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