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.
磷元素形態(tài)及懸浮物含量對再生水磷濃度的影響
- Title:
- Effects of Phosphorus Form and Suspended Solids Content on Phosphorus Concentration in Reclaimed Water
- 關(guān)鍵詞:
- 再生水; 磷元素形態(tài); 懸浮物; 溶解性非活性磷; 顆粒態(tài)磷
- Keywords:
- reclaimed water; phosphorus form; suspended solid; soluble non?reactive phosphorus; particulate total phosphorus
- 摘要:
- 針對再生水廠出水磷濃度標準限值日趨嚴格的需求，開展了磷元素形態(tài)及懸浮物含量對再生水磷濃度的影響研究。結(jié)果表明，溶解性非活性磷（sNRP）和顆粒態(tài)磷（pTP）是影響再生水達到極限低磷濃度的關(guān)鍵因素。污水經(jīng)過生物化學法處理以后，再生水中sNRP和pTP濃度分別為0.06和0.04 mg/L，其中去除sNRP較為困難，化學除磷也無明顯效果，且過量使用除磷藥劑會導致水中鋁離子濃度升高。當硫酸鋁投加量為20 mg/L時，水中殘余鋁離子濃度高達55.4 ug/L。pTP濃度與再生水中懸浮物（SS）濃度成正比，SS中磷濃度為27~43 mg/g，SS越高，出水pTP濃度越高，進而導致出水總磷升高。此外，SS中磷濃度與水廠生物除磷效果和污泥停留時間呈正相關(guān)關(guān)系，鑒于目前水廠的處理工藝，降低出水SS是再生水達到極限低磷濃度最有效的途徑。在水廠運行過程中需要控制出水SS低于1 mg/L，即可實現(xiàn)再生水總磷濃度低于0.05 mg/L，從而降低再生水磷元素超標引起的藻華風險。
- 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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