The high efficiency of the process of water purification from Fe(III) hydroxo-compounds by microfiltration tubular ceramic membrane based on clay minerals has been shown. This water purification process was developed by Dumanskii Institute of Colloid and Water Chemistry (ICWC), National Academy of Science of Ukraine. The effect of the initial solution concentration, its pH, working pressure, the process duration, and the presence of Cl, SO₄²⁻ HCO₃⁻, Ca²⁺ and Na⁺ ions on the separation properties of membrane was studied. The total salt content of the solution did not exceed the maximum permissible concentration (MPC) of the total mineralization of drinking water. It was established that Fe(III) solutions with Fe(III) initial concentration of up to ∼170 mg/dm³ could be purified to the Fe(III) MPC level in drinking water at pH_ini 5.0–7.5 and P = 1.0 MPa during the whole process when the membrane specific performance varied in the range 0.28–0.43 m³/(m²·h). As a result of dynamic modification by Fe(III) hydroxo-compounds at the minimum solution pH_ini 2.8, the membrane retained 33.8% of Ca²⁺ ions, i.e. acquired the ultrafiltration properties. The presence in solution of Cl⁻, SO₄²⁻, and HCO₃⁻ ions, each in the amount of 200 mg/dm³, and Ca²⁺ and Na⁺ ions in the amount of 150 and 236 mg/dm³, respectively, practically did not affect the retention of Fe(III) hydroxo-compounds by ceramic membrane. Since such membranes are cheaper than similar membranes based on oxide ceramics and not inferior to them in terms of the efficiency and can work in most severe conditions, they can be used in practice for the purification of the surface and underground natural waters from Fe(III) hydroxo-compounds, including compounds of various classes, such as chloride, sulfate, hydrocarbonate (carbonate), and mixed type. In addition, they can be applied in local installations for pretreatment of drinking water.

中文翻译：

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基于粘土矿物的陶瓷膜从铁的羟基化合物中纯化水

已显示通过基于粘土矿物的微滤管状陶瓷膜从Fe（III）羟基化合物中纯化水的高效方法。乌克兰国家科学院的杜曼斯基胶体与水化学研究所（ICWC）开发了这种水净化工艺。初始溶液浓度，其pH，工作压力，处理的持续时间，和Cl的存在的效应，SO ₄ ^2- HCO ₃ ^- ，钙²⁺和Na ⁺研究了离子对膜分离性能的影响。溶液的总盐含量不超过饮用水总矿化的最大允许浓度（MPC）。已确定可以将Fe（III）初始浓度高达〜170 mg / dm ^3的Fe（III）溶液纯化到pH _ini 5.0-7.5和P = 1.0 MPa的饮用水中的Fe（III）MPC水平。在整个过程中，膜的比性能在0.28–0.43 m ³ /（m ² ·h）范围内变化。由于Fe（III）羟基化合物在最低溶液pH _ini 2.8下进行了动态改性，因此该膜保留了33.8％的Ca ²⁺离子，即获得超滤性能。以Cl溶液中存在^-，SO ₄ ^2-，和HCO ₃ ^-离子，在每200毫克/分米量³和Ca ²⁺和Na ⁺离子中的150和236毫克/分米量³分别实际上并没有影响陶瓷膜对Fe（III）羟基化合物的保留。由于此类膜比基于氧化物陶瓷的类似膜便宜并且在效率方面不逊于它们，并且可以在最恶劣的条件下使用，因此它们可用于实践中从Fe（III）净化地表和地下水中的天然水。 ）羟基化合物，包括各种类别的化合物，例如氯化物，硫酸盐，碳氢化合物（碳酸盐）和混合类型。此外，它们还可用于本地设施中以对饮用水进行预处理。