Abstract

A high efficiency of the process of water purification from Mn(II) compounds formed at pH 8.3–8.4 on a Mn(II) modified microfiltration tubular ceramic membrane of clay materials, which was developed in the Dumansky Institute of Colloid Chemistry and Water Chemistry of the National Academy of Sciences of Ukraine, was shown. The conditions for the dynamic modification of the ceramic membrane with these compounds were determined. The effect of the initial Mn(II) concentration in a solution and its pH, the working pressure, the water purification time, and the additives of salts containing Cl^–, \({\text{SO}}_{4}^{{2 - }}\), \({\text{HCO}}_{3}^{ - }\), and Са²⁺ions on the separation properties of the modified ceramic membrane was studied. The purification of water from Mn(II) compounds on the ceramic membrane was studied on the model MnCl₂ ⋅ 4H₂O salt solutions within a concentration range of 1.5–33.0 mg/dm³. It has been established that such a membrane can purify water from Mn(II) compounds to their maximum permissible concentration in drinking water at an initial manganese concentration of up to 4.34 mg/dm3, pH_init = 8.4, a working pressure of 1.0 MPa, and a purification time of 75–100 min, when a solution contains Cl^–, \({\text{HCO}}_{3}^{ - }\), \({\text{SO}}_{4}^{{2 - }}\), and Ca²⁺ions, respectively, at a concentration of 200 mg/dm³ for each of the ions. The addition of salts containing the above ions to the initial solution at the moment when the maximum permissible concentration of manganese was attained had a slight effect on the ability of this ceramic membrane to retain the Mn(II) compounds. In this case, the specific productivity of the membrane was ranged within 0.16–0.20 m³/(m² h). The obtained results might be explained by the steric membrane action mechanism based on the difference between the sizes of Mn(II) compound particles and membrane pores themselves with the further formation of an additional modifying layer of these particles on its surface.

中文翻译：

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在粘土矿物改性陶瓷膜上从锰化合物中纯化水

摘要

由Dumansky胶体化学和水化学研究所开发的一种高效率的水净化工艺，该工艺用于从Mn（II）改性的粘土材料微滤管状陶瓷膜上pH 8.3-8.4形成的Mn（II）化合物中纯化水。显示了乌克兰国家科学院。确定了用这些化合物动态改性陶瓷膜的条件。溶液中初始Mn（II）浓度及其pH值，工作压力，水净化时间以及含Cl ^–的盐的添加剂的影响，\（{\ text {SO}} _ {4} ^ { {2-}} \），\（{\ text {HCO}} _ {3} ^ {-} \）和Са2 ⁺研究了离子对改性陶瓷膜分离性能的影响。水从在所述陶瓷膜的Mn（II）化合物的纯化进行了研究在模型上的MnCl ₂ ⋅4H ₂的1.5-33.0毫克/分米的浓度范围内ö盐溶液³。业已确定，这种膜可以在初始锰浓度最高为4.34 mg / dm3，pH _init = 8.4，工作压力为1.0 MPa的条件下，从饮用水中的Mn（II）化合物中纯化水至其最大允许浓度。当溶液中含有Cl ^–，\（{\ text {HCO}} _ {3} ^ {-} \），\（{\ text {SO}} _ {4}时，纯化时间为75–100分钟^ {{{2-}} \）和Ca ²⁺每种离子的浓度分别为200 mg / dm ³。在达到锰的最大允许浓度时，将含有上述离子的盐添加到初始溶液中，对这种陶瓷膜保留Mn（II）化合物的能力影响不大。在这种情况下，膜的比生产率为0.16-0.20 m ³ /（m ² h）。可以通过基于Mn（II）化合物颗粒尺寸和膜孔本身之间的差异的空间膜作用机理来解释获得的结果，并在其表面上进一步形成这些颗粒的附加改性层。