The first establishment of the ³⁵Cl qNMR method was achieved in this study. The calibration curves showed that extremely high linearity was established over a wide chloride concentration range from 1.0 × 10⁻³ to 3.6 mol L⁻¹. The various Al hydrolysis products were detected nondestructively by 27Al qNMR, and their concentrations were determined. The K-Al₁₃ was not detected in the solutions containing a large amount of SO₄²⁻ ions, and K-Al₁₃ was observed at pH 3–6. The K-Al₁₃ concentration reached a local maximum when the aging time was approximately one day to one week. The highly charged K-Al₁₃ (i.e., 7 + ) and DLVO theory revealed an efficient coagulation mechanism for the model sludge. The aggregation rate of the PACS-0.15 model sludge containing SO₄²⁻ ions with an SO₄²⁻/Al molar ratio of approximately 10% was high over a wide Al concentration range owing to the formation of large flocs. If the model sludge water contains excess SO₄²⁻ ions, the SO₄²⁻ ions contribute minimally to the growth of large flocs of model sludge, hence, the model sludge did not aggregate efficiently.

本研究首次建立了³⁵ Cl qNMR 方法。校准曲线表明，在从 1.0 × 10 ^-3到 3.6 mol L ^-1的宽氯化物浓度范围内建立了极高的线性。通过 27Al qNMR 无损检测了各种 Al 水解产物，并确定了它们的浓度。在K-Al系₁₃没有在含有大量SO的解决方案检测₄ ^2-离子和K-Al系₁₃在pH 3-6进行了观察。K-Al ₁₃浓度在老化时间约为1天至1周时达到局部最大值。高电荷 K-Al ₁₃（即 7 + ）和 DLVO 理论揭示了模型污泥的有效凝结机制。由于大絮凝物的形成，含有 SO ₄ ^2-离子的 PACS-0.15 模型污泥的聚集率在很宽的 Al 浓度范围内较高，其 SO ₄ ^2- /Al 摩尔比约为 10%。如果模型污泥水中含有过量的 SO ₄ ^2-离子，SO ₄ ^2-离子对模型污泥大絮体的生长贡献很小，因此，模型污泥不能有效聚集。