• 关键词：响应面法  白云石石灰  污泥消化液  磷去除与回收

• 基金项目：国家自然科学基金项目（No.51078339）；中央级公益性科研院所基本科研业务专项（No.2011KYYW-01）

• 林郁
• 1. 中国地质大学（北京）水资源与环境工程北京市重点实验室, 北京 100083;2. 中国环境科学研究院城市水环境科技创新基地, 北京 100012

• 刘雪瑜
• 中国环境科学研究院城市水环境科技创新基地, 北京 100012

• 宋永会
• 中国环境科学研究院城市水环境科技创新基地, 北京 100012

• 刘菲
• 中国地质大学（北京）水资源与环境工程北京市重点实验室, 北京 100083

• 葛杰
• 中国环境科学研究院城市水环境科技创新基地, 北京 100012

• 孟晓光
• 1. 中国环境科学研究院城市水环境科技创新基地, 北京 100012;2. 史蒂文斯理工学院 环境系统中心, 霍博肯, 新泽西, 美国 07030

• 摘要：针对污水处理厂污泥消化上清液的组成特点，利用白云石石灰去除和回收污泥消化液中的磷.同时，根据Box-Behnken Design实验设计及响应面法进行工艺优化，对实验过程中药剂的投加量（X₁）、反应初始pH值（X₂）及反应温度（X₃）3个重要影响因素的单独作用及各因素之间的交互作用进行了考察，并建立了数学模型.结果表明，响应曲面模型拟合度较高（R²为0.9680），回归方程中X₁、X₂、X₃、X₁X₃、X₁²、X₂²对磷去除率影响显著；综合考虑操作的简便性及经济性，选取最佳条件组合为：白云石石灰投加量300 mg·L^-1，初始pH值9.0，反应温度25 ℃，验证实验结果为89.08%，与预测值相比偏差为0.39%.通过扫描电子显微镜、傅里叶变换红外光谱和X射线衍射表征技术分析结晶沉淀组成和晶形特征，表明产物中含有磷酸铵镁晶体、无定形磷酸钙及杂质碳酸钙等.

• Abstract：Dolomitic lime was utilized to recover phosphate from sludge digestion supernatant. The linear, quadratic and interaction effects of dolomitic lime dosage (X₁), initial reacting pH values (X₂) and temperature (X₃) on the removal efficiency were investigated using Box-Behnken Design experiments and response surface methodology. An empirical mathematical model describing the relationship between response values (phosphate removal rates, denoted as Y) and the influence factors was presented. The results demonstrated that regression equation fit well with experimental data (R² equals to 0.9680). X₁, X₂, X₃, X₁X₃, X₁² and X₂² had significant effects on phosphate recovery efficiency. Considering simplicity and efficiency of operation, the optimum conditions of dolomitic lime 300 mg·L^-1, initial pH 9.0 and 25.0 ℃ were selected. Under the optimum conditions the removal rate of phosphate was 89.08% with 0.39% of relative deviation between the experimental and predicted values. Scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction were performed to characterize the composition of the recovered products. It was shown that the recovered products consisted of ammonium magnesium phosphate and amorphous calcium phosphate, as well as impurity, i.e. calcium carbonate.

• Key words：response surface methodology  dolomitic lime  sludge digestion supernatant  phosphate removal and recovery

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