Adsorption Equilibrium, Kinetics, Thermodynamics and Dynamic Separation of Magnesium and CalciumIons from Industrial Wastewater by New Strong Acid Cation Resin of SPVC

In the research work, the adsorption equilibrium, kinetics, thermodynamics and dynamic separation of magnesium and calcium ions from industrial wastewater by new strong acid cation resin of SPVC (sulphonated polyvinylchloride) were investigated. The sorption capacity of the studied resin was 3.78 mmol/g and 3.74 mmol/g for magnesium and calcium ions, respectively, according to Langmuir isotherm. It was found that the pseudo−first−order model was better fitted for the adsorption kinetics of magnesium and calcium ions on the resin. The dynamic separation results confirmed that the selected resin effectively separated magnesium and calcium ions from industrial wastewater in the dynamic condition. The change of the standard Gibbs free energy (G) and enthalpy (H), and entropy (S) were calculated. The obtained results confirmed that the adsorption of magnesium and calcium ions on the selected resin is endothermic.

Silver-containing Cation Exchange Resin: Synthesis and Application

Cation exchange resins are widely used for water softening and demineralization all over the world. Deposition, metabolism, and growth of bacteria and fungi on the resin beads cause capacity and performance losses, especially during repeated use in cyclic and long-term operations. Over the last decades, modification of different materials by silver nanoparticles (AgNPs) has demonstrated to present significant opportunities in mitigating biofouling problems. The paper deals with a novel facile technique of introducing silver colloids (AgC) into cation exchange resin, providing the formation of silver micro- and nano-inclusions on the cation resin beads. The scanning electron microscope (SEM) measurements have confirmed a spherical shape and uniform distribution of AgC (50 – 1000 nm) on the surface of the resin. To evaluate the antibacterial and fungicidal properties of AgC on the cation resin beads, we have used Aureobasidium sp., Penicillium sp., and Staphylococcus aureus cultures. AgC coating has proved to efficiently prevent bacteria/biofilm growth on the cation resin beads and thereby significantly increase the service life of the cation exchange resin, especially in hot climatic conditions. Possible antibiofouling mechanisms of the modified nanocomposite cationite have been discussed. Since 2020, the modified silver-containing cationite has been successfully utilized for water softening systems of boiler equipment in Uzbekistan, demonstrating the suitability of the suggested facile coating technique for reducing fouling of cation-exchange resin.

Separation of ions of cobalt (II) and iron (III) with use of nonselective sulfonic cation resin KU-2-8

A separation method of ions of cobalt (II) and iron (III) has been proposed and studied for the case of their simultaneous presence in a solution. This method includes preliminary separation of an iron portion by alkaline precipitation with pH = 2.3, obtaining the product of simultaneous precipitation of iron and cobalt and extraction of cobalt from it by the method of cation-exchange leaching with the use of nonselective sulfonic cation resin KU-2-8.

Efisiensi Penurunan Kandungan Uranium dalam Limbah Cair Pengolahan Monasit Menggunakan Resin Penukar Kation Tulsion T-40 Na

ABSTRAKLimbah cair merupakan salah satu hasil dari proses produksi yang mengandung beberapa campuran atau senyawa kimia yang berbahaya. Salah satunya adalah limbah cair dari proses pengolahan monasit yang mengandung unsur radioaktif, yaitu uranium (U). Limbah cair yang mengandung unsur radioaktif, terutama uranium, menjadi bahan berbahaya apabila terlepas ke lingkungan karena kanndunga nuklida aktif nya yang dapat mempengaruhi kesehatan lingkungan dan masyarakat. Oleh karena itu, perlu dilakukan pengolahan limbah cair dari pengolahan monasit. Metode yang digunakan adalah proses pertukaran ion dengan resin kation yaitu Tulsion T-40 Na yang dapat menurunkan kandungan uranium dan kandungan kation lainnya pada limbah cair pada konsetrasi rendah. Pertukaran ion dilakukan melalui proses pengadukan dengan variasi bobot resin dan waktu kontak. Pengukuran kandungan uranium dilakukan dengan Spektrofotometer UV-Vis, sedangkan pengukuran pH dan nilai TDS pada limbah cair dilakukan untuk mengetahui karakteristik limbah. Hasil penelitian menunjukkan kondisi optimum proses pertukaran ion pada bobot resin 1,5 g dengan waktu kontak selama 300 menit menghasilkan penurunan kadar uranium sebesar 83,40 %.ABSTRACTWaste-water is one of the production process that contains several dangerous mixtures or chemical compositions. One of them is waste-water from monazite processing which is containing radioactive element like uranium (U). Waste-water with radioactive content, mainly uranium, became a hazardeous content if it is released to the environment because of its active nuclide content that effect the environment and community health. Therefore, it is necessary to treat waste-water from monasite processing. The method used is ion exchange process with a cation resin, namely Tulsion T-40 Na, which can reduce uranium content and other cations in waste-water at low concentration. Ion exchanging is conducted through stirring process with resin weight and contact time variations. Measurements on uranium content are carried out using the UV-Vis Spectrophotometer, while measurements on pH and TDS values in waste-water are conducted to determine the characteristics of the waste. The results showed that optimum condition of the ion exchange process at 1.5 g resin weight with 300 minutes contact time is resulting a reduction on uranium content as much as 83.40 %.

PERANCANGAN TEKNOLOGI REVERSE OSMOSIS DENGAN MEMANFAATKAN AIR EFLUEN PENGOLAHAN AIR LIMBAH SEBAGAI BAHAN BAKU DALAM UPAYA MENGEFISIENSIKAN PEMAKAIAN AIR BERSIH DARI KAWASAN INDUSTRI MM2100 (Studi Kasus pada PT Yutaka Manufacturing Indonesia)

<p align="justify">PT. YMI is one of the automotive manufacturers for two-wheeled vehicles. As a part of the Astra Group, the company strives to become a "Green Company" through the AGC (Astra Green Company) program. One of its assessments is a 30% wastewater recycle program per month which aims to save or use clean water efficiently. The technology used for purification of effluent water from waste water treatment is by Reverse Osmosis technology with initial treatment by using Cation Resin, Activated Carbon and Micro-filtration process. The membrane used for this Reverse Osmosis system is the Filmtec 30-4040 TW / BW. The result of the application of Reverse Osmosis technology to clean water usage in PT. YMI is 34.99% which this success can be achieved due to the recycling of effluent water contributing 100%. In addition, there are also benefits obtained from the absence of effluent water into the industrial estate. Income fee earned amounted to Rp 23,591,675, - / month. For expenses (electricity usage, spare part and overtime) Rp 11.470.172, - / month so the profit earned is Rp 12.121.503, - / month. Payback Period for this R.O. system will be achieved for 24 months or 2 years.</p>