In this paper, nutrient recovery from sewage sludge as struvite using pulsed electric field (PEF) technique was performed. Box-Behnken response surface methodology (BBD) was used to determine the best struvite formation conditions. NH₄-N removal efficiency (Y₁) and PO₄-P removal efficiency (Y₂) were considered response functions, while the pH (X₁), magnesium concentration (X₂, mM), and phosphate concentration (X₃, mM) were considered independent variables in the BBD. The best struvite formation conditions by using BBD optimization was found for pH 8.5 and Mg⁺²/NH₄⁺/PO₄⁻ molar ratio of 1.2:1:1.2 at 89.83% NH₄-N and 80.30% PO₄-P removal efficiency. The predicted dates for response functions determined by regression analysis exhibited excellent agreement with the experimental results. The obtained precipitation contained 61.7% struvite (MgNH₄PO₄·6H₂O) and 38.3% nahpoite (Na₂HPO₄). The goodness of fit (GOF) was found as 1.67 and Bragg factor was calculated as 47.4% for this match in Rietveld refinement. Ammonia loss was calculated as 13% at optimum operation conditions using Visual Minteq. Saturation index (SI) value calculated by Visual Minteq was above zero, which means that the struvite can occur to the liquid phase of sludge pre-treated by PEF. After PEF pre-treatment, the heavy metals in liquid phase of WAS were below detection limit, except Cr and Ni. In study in evaluation of the obtained struvite, the heavy metal contents of the sediment were founded below the limit value, except Cr.

在本文中，使用脉冲电场 (PEF) 技术从以鸟粪石形式的污水污泥中进行养分回收。Box-Behnken 响应面方法 (BBD) 用于确定最佳鸟粪石形成条件。NH ₄ -N 去除效率 (Y ₁ ) 和 PO ₄ -P 去除效率 (Y ₂ ) 被认为是响应函数，而 pH (X ₁ )、镁浓度 (X ₂ , mM) 和磷酸盐浓度 (X ₃ , mM) 被认为是 BBD 中的自变量。在 pH 8.5 和 Mg ⁺² /NH ₄ ⁺ /PO ₄下发现了使用 BBD 优化的最佳鸟粪石形成条件^-在 89.83% NH ₄ -N 和 80.30% PO ₄ -P 去除效率下，摩尔比为 1.2:1:1.2 。通过回归分析确定的响应函数的预测日期与实验结果非常吻合。所得沉淀物含有 61.7% 鸟粪石 (MgNH ₄ PO ₄ ·6H ₂ O) 和 38.3% 钠沸石 (Na ₂ HPO ₄）。拟合优度 (GOF) 为 1.67，在 Rietveld 细化中，此匹配的布拉格因子计算为 47.4%。使用 Visual Minteq 在最佳操作条件下计算出的氨损失为 13%。Visual Minteq 计算的饱和指数（SI）值在零以上，这意味着鸟粪石可以出现在 PEF 预处理的污泥液相中。PEF预处理后，除Cr和Ni外，WAS液相中的重金属均低于检出限。在对所得鸟粪石的评价研究中，除Cr外，沉积物的重金属含量均低于限值。