scholarly journals On the possibility of using ion-exchange filters for water treatment

2018 ◽  
Vol 245 ◽  
pp. 12007
Author(s):  
Tatiana Germanova
Keyword(s):  
Water Treatment ◽  
Ion Exchange ◽  
Power Plants ◽  
Natural Waters ◽  
Federal District ◽  
Exchange Capacity ◽  
Water Withdrawal ◽  
Cation Exchangers ◽  
Treatment Equipment ◽  
Low Efficiency

This study was conducted with the aim of preliminary assessment of the total use of the working exchange capacity of cation-exchangers during ion-exchange filtration of surface waters. The chemical composition of natural waters in Russia depends on many factors, which affects the performance indicators during operation of water treatment equipment. Comparison of geochemical indicators of natural waters of the Ob River basin at specific locations of water withdrawal in the Ural Federal District of Russia was carried out. For several compositions of natural waters, the calculation of two-stage ion-exchange filtration in the water treatment scheme for heat and power plants has been carried out. The possibility of rational use of ion-exchange filtration at the first stage of water purification and low efficiency of the use of ion-exchange filtration at the second stage of filtration for these plants is shown.

The Use of Aluminosilicate Sorbent for the Purification of Natural Waters from Heavy Metals

2020 ◽  
Vol 24 (3) ◽  
pp. 19-23 ◽  
Author(s):  
A.S. Kutergin ◽  
T.A. Nedobukh
Keyword(s):  
Heavy Metals ◽  
Drinking Water ◽  
Water Treatment ◽  
Mechanical Strength ◽  
Natural Waters ◽  
Drinking Water Treatment ◽  
Exchange Capacity ◽  
Filtration Process ◽  
Treated Water ◽  
Dynamic Exchange

The possibilities of using natural granular glauconite in standard water treatment schemes have been investigated. Resource tests of the studied material were carried out in dynamics, simulating possible conditions of use. As a result of the experiments, it was established: during the filtration process, alkalization of water occurs, but the result does not exceed pH = 6÷9, which are the norm for drinking water; the use of a sorbent based on natural glauconite does not impair the hardness indicator of the treated water. The dynamic exchange capacity was: for iron – 3.09 mg/g of absorbent, copper – 19.15 mg/g of absorbent, zinc – 4.82 mg/g of absorbent. The resource of the filter was determined with the loading of granulate with a volume of 1 dm3: for iron – 2918 dm3, for copper – 5425 dm3, for zinc – 273 dm3. The mechanical strength acquired by the sorbent as a result of granulation made it possible to wash the load by the countercurrent method, freeing intergranular pores from the sediment accumulated in them. The revealed capabilities of granular glauconite will allow its use in drinking water treatment schemes for purifying natural waters from heavy metals: iron, zinc, copper.

An experimental study of sorption properties of natural zeolite-containing rocks and their ability for purification of aquatic solutions contaminated with Ni and Zn

2020 ◽  
Author(s):  
Liudmila Kolmykova ◽  
Valentina Nikashina ◽  
Elena Korobova
Keyword(s):  
Ion Exchange ◽  
Natural Zeolite ◽  
Natural Waters ◽  
Distribution Coefficients ◽  
Exchange Capacity ◽  
Ammonium Ion ◽  
Geochemical Barrier ◽  
Solid Domestic Waste ◽  
Ion Exchange Capacity ◽  
Model Solutions

<p>Sorption parameters of natural zeolite-containing tripolite from the Khotynetsky deposit (Russia, Oryol region) were studied in a series of experiments to evaluate possibility of its usage as a geochemical barrier for teсhnogenic Ni<sup>2+</sup> and Zn<sup>2+</sup> contaminating soils and ground waters. <br>Firstly, the tripolite total ion-exchange capacity was established by its saturation with ammonium ion and evaluating its content in the initial and ammonium forms with the help of X-ray fluorescence method. Secondly, the kinetic characteristics, namely the time necessary to reach the equilibrium state of the rock-water system containing Ni<sup>2+</sup> and Zn<sup>2+</sup> ions were determined in batch experiments using the method of "limited volume". The latter experiment was conducted using 0.5 g tripolite with 250 ml model solutions simulating natural river water (0.003 н CaCl<sub>2</sub>) and filtration water from solid domestic waste landfill (0.06 н CaCl<sub>2</sub>) and containing  2 mg/l Ni<sup>2+</sup> and  Zn<sup>2+</sup>. The time of contact between the sorbent and the model solution varied from 2 hours to 21 days. Thirdly, basing on reference data on the real content of heavy metals in the filtrates of various landfills, an experiment on determination of the tripolite equilibrium exchange (and adsorption) capacity was carried out. The prepared model solutions in the latter experiment contained 2, 5, 7 and 10 mg/l of Ni<sup>2+</sup> and Zn<sup>2+</sup>. The amount of Ni<sup>2+</sup> and Zn<sup>2+  </sup>in solutions was determined by the ICP-AES.<br>According to the obtained results, the total ion-exchange capacity of the natural tripolite equaled to 1.18 mg-eq/g. The sorption isotherms based on kinetic experiments showed that equilibrium in the studied rock-solution system took place after 200 to 500 hours of interaction. Despite natural scattering of experimental points in the range of the used Ni<sup>2+</sup> and Zn<sup>2+</sup> concentrations in the third experiment which lasted 21 days, the sorption of the studied ions by the natural tripolite can be approximated by a linear isotherm, zinc being sorbed much better than nickel. The average values of distribution coefficients (Kd) obtained for 0.003 n CaCl<sub>2</sub> aquatic solution equaled to 2.7*103 ml/g for Ni<sup>2+</sup> and 6.7*103 ml/g for Zn<sup>2+</sup>.<br>Therefore, natural tripolite of the Khotinetsky deposit may well be used as a natural geochemical barrier for extraction of technogenic Ni<sup>2+</sup> and Zn<sup>2+</sup> from natural waters draining landfills and contaminated by these ions.</p><p> </p>

scholarly journals Research and results of mathematical modeling of block ion-exchange water treatment plants operating modes and regeneration

2022 ◽  
Vol 2150 (1) ◽  
pp. 012002
Author(s):  
A A Chichirov ◽  
A A Filimonova ◽  
N D Chichirova ◽  
O E Babikov
Keyword(s):  
Mathematical Modeling ◽  
Water Treatment ◽  
Ion Exchange ◽  
Power Plants ◽  
Filter Design ◽  
Thermal Power ◽  
Treatment Plant ◽  
Maximum Output ◽  
Solution Flow ◽  
Hydrodynamic Mode

Abstract The problem of water treatment at thermal power plants using ion-exchange technologies is a multi-parameter task. Mathematical modeling is essential for research and optimization of ion exchange technology. The analysis of hydrodynamic processes during the operation of ion-exchange filters was carried out according to the developed mathematical model. Also, a physicochemical analysis of the composition of the water treatment plant solutions under real conditions was carried out. It is shown that in the cationite and anionite filters, the flow movement occurs mainly in a mixed hydrodynamic mode. This mode of regeneration and the filter design do not allow achieving the minimum consumption of the reagent for regeneration, the minimum volume of wastewater and the maximum output of demineralized water. The mixed mode of the anion exchange filter operation allows division of the outgoing solution flow into fractions, which can be successfully used in the TPP water cycle.

scholarly journals Design and application of purified water preparation device for chemical analysis

2021 ◽  
Vol 261 ◽  
pp. 02062
Author(s):  
Yanping Li ◽  
Jianjun Fang ◽  
Liwen Hou
Keyword(s):  
Water Treatment ◽  
Ion Exchange ◽  
Chemical Analysis ◽  
Reverse Osmosis ◽  
Trace Analysis ◽  
Free Water ◽  
Pipeline System ◽  
Water Production ◽  
Treatment Unit ◽  
Cation Exchangers

Qualified purified water is essential for all chemical analysis. Spectral analysis, trace analysis and general chemical analysis require different purity of water. This paper introduces a kind of purified water preparation device which can be widely used in all chemical analysis work. The purified water preparation device consists of two-stage reverse osmosis device and water treatment device of ion exchange system. The two-stage reverse osmosis water treatment unit can be operated in two modes: program-controlled and manual mode, and the water production rate is about 80%. The ion exchange water treatment unit consists of two cation exchangers, two cation exchangers and one mixed ion exchanger, which can prepare silicon free water and sodium free water and meet the requirements of trace analysis. The ion exchange water treatment unit is equipped with independent purified water pipeline system and regenerated liquid pipeline system to avoid the pollution of purified water. The regeneration operation of ion exchange resin is simple, and the discontinuous water production can be easily realized. This set of purified water preparation device can adapt to various water sources to complete purification treatment, and produce purified water meeting various chemical analysis.

scholarly journals New water treatment technology - homogeneous membrane electrodialysis

2019 ◽  
Vol 79 ◽  
pp. 03003
Author(s):  
Guorui Tang ◽  
Kuan He ◽  
Deqing Liu
Keyword(s):  
Water Treatment ◽  
Ion Exchange ◽  
Chemical Properties ◽  
Exchange Capacity ◽  
Treatment Technology ◽  
Ion Exchange Capacity ◽  
Treatment Processes ◽  
Effective Removal ◽  
Physical And Chemical ◽  
Exchange Membrane

This paper introduces the structure and technical principle of the homogeneous membrane electrodialyzer, and describes that the homogeneous ion exchange membrane has excellent ion exchange capacity, low water loss rate, stable physical and chemical properties and effective removal of organic matter. The homogeneous membrane electrodialysis technology should be combined with other water treatment processes in practice to achieve better treatment results.

scholarly journals Removal of Ammonium Ions from Aqueous Solutions Using Weathered Halloysite

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4359
Author(s):  
Jacek Leszczyński
Keyword(s):  
Ion Exchange ◽  
Natural Waters ◽  
Exchange Capacity ◽  
Ammonium Ion ◽  
Order Kinetic ◽  
Ammonium Ions ◽  
Ion Exchange Capacity ◽  
Ion Removal ◽  
Order Kinetic Model ◽  
Pseudo Second Order

This study investigated the use of weathered halloysite as an ion exchange material for ammonium removal from water. The study was conducted under static and dynamic conditions. The influence of such parameters as the preliminary concentration of ammonium ions, dose of halloysite, and pH was examined in periodic studies. The ion exchange capacity of weathered halloysite under various regeneration conditions such as concentration, excess of regeneration solution and the pH at which the regeneration was performed was also determined. The effect of flow velocity, initial NH4+-ions concentration was studied in column tests and the weathered halloysite’s ion -exchange capacity was also determined. The best results of ammonium ion removal were obtained at pH 6. The equilibrium isotherms were described using the Langmuir and Freundlich models. The results of periodic studies show a good fit for the data of both models, with Langmuir isotherms reflecting the removal of ammonium ions better. A good match for the data (R2 > 0.99) was provided by a pseudo second-order kinetic model. The obtained results indicate that a properly prepared halloysite can be a useful mineral for the removal of dangerous substances, such as ammonium ions, present in natural waters.

scholarly journals THE IMPROVEMENT OF LOW-WASTE TECHNOLOGIES OF WORKING BODY OF WATER PREPARATION AT THERMAL AND NUCLEAR POWER PLANTS

2017 ◽  
Vol 60 (4) ◽  
pp. 367-379
Author(s):  
K. D. Rymasheuskaya
Keyword(s):  
Water Treatment ◽  
Nuclear Power ◽  
Power Plants ◽  
Nuclear Power Plants ◽  
Negative Impact ◽  
Water Desalination ◽  
Hazardous Substances ◽  
Technological Scheme ◽  
Treatment Equipment ◽  
The One

In the present work the main directions of water desalination technologies improving have been analyzed. Possible techniques of high-quality treatment of water that enable the reduction of amounts of environmentally hazardous substances to be discharged into the hydrosphere are indicated. The purpose of the work was to improve the ecological efficiency and the effectiveness of water treatment equipment at heat power plants when designing new and the modernizing existing water treatment schemes. In order to achieve this goal the following problems have been solved: the one of analyzing the main directions of the improvement of technologies of working body of water preparation at thermal and nuclear power plants; of analyzing the main directions of reduction of total volume of highly mineralized power plant wastewaters; of developing the technological scheme of recycling of concentrate of membrane installations and regenerants of ionite filters in acid and alkali; of developing the technological scheme of transformation of the sludge in pre-processing waste into valuable commodity products. The results of research can be applied for the design of new and the modernization of existing water treatment installations of thermal and nuclear power plants. It will enable to reduce considerably the use of natural water and the amount of chemicals added as well as the volume of wastewater and the concentration of dissolved solids in it. As a consequence, the negative impact of thermal and nuclear power plants on the hydrosphere will be reduced. 

scholarly journals WATER TREATMENT BY AN INTEGRATED METHOD FOR OPERATION OF WATER BOILERS AND HEATING NETWORKS

2021 ◽  
Vol 10 (4) ◽  
pp. 50-59
Author(s):  
Larisa L. NEGODA ◽  
Svetlana A. MINKINA ◽  
Sergej Ye. ANGALYShEV ◽  
Vladislav Alekseevich CEJZER
Keyword(s):  
Water Treatment ◽  
Ion Exchange ◽  
Exchange Capacity ◽  
Laboratory Research ◽  
Integrated Method ◽  
Cleaning Methods ◽  
Two Stages ◽  
Economic Comparison ◽  
Heating Networks ◽  
Mechanical Cleaning

The use of a complex fi lter for water treatment is proposed for the fi rst time. The complex fi lter includes two layers. The fi rst layer along the course of the water should be loading for mechanical cleaning, the second - for softening (ion exchange). Cleaning can be one- or two-stage. For research, water was used from three wells in the Samara region. In the course of the work, two stages of laboratory research were carried out, on the basis of which the best fi ltering load was determined. The calculation of the total and working exchange capacity has been made. A technical and economic comparison of cleaning methods was carried out. The results of the work performed were summed up, proposals were made for the rational use of installations and the prospects for the development of the work in the future were determined.

Sign in / Sign up

Export Citation Format

Share Document