|1Dulneva, TYu. |
1A. V. Dumansky Institute of Colloid and Water Chemistry of the NAS of Ukraine, Kyiv
|Dopov. Nac. akad. nauk Ukr. 2020, 6:101-108|
The work is devoted to determining the parameters of water purification from hydroxocompounds of copper by the latest microfiltration tubular membranes from natural materials: ceramic (from clay minerals) and lignocellulosic (from wood) ones. Membranes developed at A.V. Dumansky ICCWC of the NAS of Ukraine and made from natural materials can be an effective alternative to membranes made from traditional materials — polymers and oxide ceramics. Such membranes are made from environmentally friendly raw materials that are renewable and easy to be disposed. Membranes made from natural materials are simply regenerated by the reverse flow of purified water and have a long service life. The effects of filtration duration, pH of the initial solution, presence of accompanying ions (Cl–, SO42–, HCO3–, Са2+, and Na+), and the permeate selection (η) coefficient on the separation properties of membranes made of natural materials are studied. It has been established that it is most expedient to purify water from Cu hydroxocompounds with ceramic and lignocellulose membranes with an initial concentration of Cu ions up to 52.2 and 46.0 mg/dm3, respectively, at рН0 — 8.5; Р — 1.0 MPa and η — 80.0 %. Under these conditions, the concentration of Cu ions in the permeate does not exceed their MPC in wastewater for discharge into the sewer of Kyiv. The high retention capacity of the membranes is due to the steric mechanism of their action, based on the difference in the size of their pores and par ticles of Cu hydroxocompounds formed at pH 8.5. This was also facilitated by the formation of an additional retaining layer in the form of a dynamic membrane of Cu hydroxocompounds on the surface of the ceramic and lignocellulose membranes. Concomitant ions in the water negatively affected the retention ability of the membranes to Cu hydroxocompounds due to the salt effect, but the formation of a modifying dynamic membrane from them offsets this drawback. Considering the results obtained, it is proposed to use microfiltration tubular membranes from clay minerals and lignocellulose for the wastewater purification from Cu hydroxocompounds.
|Keywords: ceramic membranes from clay minerals, dynamic membrane, lignocellulosic membrane, microfiltration, water purification, Сu hydroxocompounds|
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