| 利用水绵（Spirogyra）深度处理生活污水强化除磷及其机制的探讨 |
| 摘要点击 5518 全文点击 2635 投稿时间：2008-04-08 修订日期：2008-06-16 |
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| 中文关键词 深度处理 污水 Spirogyra 除磷 除氮 |
| 英文关键词 advanced treatment sewage Spirogyra phosphorus removal nitrogen removal |
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| 中文摘要 |
| 提出了用水绵进行城市污水深度处理的方法，强化去除水中氮、磷等污染物，以实际生活污水为对象，分析了水绵（Spirogyra）的除污染性能.在自然光照条件下，Spirogyra 剂量（湿重）>3.05 g/L时，运行5 d后，TP浓度降到0.09 mg/L以下，去除率为96.84%以上；NH+4-Ｎ浓度降到2.82 mg/L以下，去除率为88.60%以上；TN浓度降到4.31 mg/L以下，去除率在85.49%以上；高锰酸盐指数降到16.86 mg/L以下，去除率为24.56%以上.处理效率随Spirogyra 剂量提高而增加.在利用Spirogyra 深度处理污水的过程中，水的pH值逐渐升高，Ca2+、Mg2+浓度降低，电导率下降.Spirogyra 生长引起水体pH 升高，诱导盐类矿物沉积，沉积矿物对磷的吸附是除磷的重要机制.Spirogyra 除磷符合Langmuir吸附等温线，本实验条件下Spirogyra(湿重)对磷的饱和吸附量(以P计）为3.159 mg/g.Spirogyra 生长引起水的pH 升高，使NH+4-Ｎ 挥发可能是除氮的主要机制.选择适当的Spirogyra 用量和处理时间，处理后的出水氮、磷含量可达到湖泊类景观环境用水的水质标准.Spirogyra良好的除氮、磷特性可能为污水深度处理提供新的技术途径. |
| 英文摘要 |
| The novel way of advanced treatment of municipal wastewater was proposed and characterized by purifying wastewater by Spirogyra. The characteristics of nitrogen and phosphorus removal by Spirogyra were studied aiming at nitrogen and phosphorus removal in advanced treatment of sewage. Under natural light, when Spirogyra's dosage (gross mass) was more than 3.05 g/L, total phosphorus concentration, NH+4-Ｎ concentration, TN concentration and permanganate index decreased to less than 0.09, 2.82, 4.31 and 16.86 mg/L respectively, with removal efficiencies of more than 96.84%, 88.60%, 85.49% and 24.56 %. During the treatment of sewage, pH value increased, while both calcium cation and magnesium cation concentration decreased, and conductivity decreased. During the growth of Spirogyra, increasing pH value induced saline minerals precipitation, and the precipitated minerals adsorbed phosphate, which were considered as the main mechanisms of phosphorus removal. Furthermore, phosphorus removal by Spirogyra followed Langmuir adsorption isotherm model, and the saturated adsorption of Spirogyra (gross mass) for phosphorus was 3.159 mg/g under this test condition. The increasing pH value made ammonia evaporate during Spirogyra growth, which might be the main mechanism of nitrogen removal. Under suitable Spirogyra's dosage and hydraulic retention time, the treated sewage might meet the demands of water supply for landscape impoundments on nitrogen and phosphorus concentrations. The better performance of Spirogyra removing nitrogen and phosphorus might provide a novel alternative way for advanced treatment of sewage. |
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