scholarly journals ИССЛЕДОВАНИЕ ЗАКОНОМЕРНОСТЕЙ СОРБЦИИ НЕКОТОРЫХ МЕТАЛЛОВ ГЛАУКОНИТОМ

2021 ◽  
pp. 9-17
Author(s):  
M.A. Sirakanyan ◽  
S.Yu. Kotikyan
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Raw Materials ◽  
Low Cost ◽  
High Capacity ◽  
Water Bodies ◽  
Time Of Arrival ◽  
Kinetic Dependence ◽  
Important Place ◽  
Static Conditions

The imperfection of industrial wastewater treatment technologies has led to the fact that a huge amount of inorganic ecotoxicants of various salts of heavy metals gets into water bodies. The extraction of a valuable component from industrial solutions seems to be economically and environmentally justified for enterprises in Republic of Armenia. Therefore, one of the directions of greening the industrial technologies is the use of local wastewater treatment plants to remove the heavy metal ions when discharging wastewater into water bodies. Most often, for these purposes, the sorption method of purification is used using various sorbents based on a wide variety of mineral raw materials. The search for ion exchangers of high capacity, selectivity, and low cost is of great importance, since ion exchange has taken an important place among the main methods of wastewater treatment. It is known from literature that the natural mineral glauconite, due to its structure and physicochemical properties, has the ability to extract heavy metals from water bodies. The presence of glauconite from the Garni deposit of RA predetermines its use, and the surface modification makes it possible to use it in water treatment. The results of kinetic studies of sorption of nickel and zinc ions under static conditions on a composite glauconite sorbent by constructing concentration isotherms are presented. The static capacities on the sorbent for zinc and nickel cations are determined. The kinetic dependence of the adsorption of zinc and nickel cations on the studied sorbent is investigated to determine the time of arrival of the equilibrium state. The limiting stage of the sorption process is determined by establishing the mechanism of interaction of the metal cation with the active center of the adsorbent. From the data obtained, it is found that the linear dependence of At/Amax indicates that the adsorption process at this stage is limited by gel external mass transfer, and the subsequent deviation - by the enhancement of the effect of external diffusion on the adsoption rate.

scholarly journals Treatment of Wastewater Using Seaweed: A Review

2018 ◽  
Vol 15 (12) ◽  
pp. 2851 ◽  
Author(s):  
Nithiya Arumugam ◽  
Shreeshivadasan Chelliapan ◽  
Hesam Kamyab ◽  
Sathiabama Thirugnana ◽  
Norazli Othman ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Raw Materials ◽  
Low Cost ◽  
Printing Industry ◽  
Adsorption Method ◽  
Untreated Wastewater ◽  
Treatment Technologies ◽  
Simulated Wastewater ◽  
Real Wastewater

Inadequately treated or untreated wastewater greatly contribute to the release of unwanted toxic contaminants into water bodies. Some of these contaminants are persistent and bioaccumulative, becoming a great concern as they are released into the environment. Despite the abundance of wastewater treatment technologies, the adsorption method overall has proven to be an excellent way to treat wastewater from multiple industry sources. Because of its significant benefits, i.e., easy availability, handling, and higher efficiency with a low cost relative to other treatments, adsorption is opted as the best method to be used. However, biosorption using naturally found seaweeds has been proven to have promising results in removing pollutants, such as dyes from textile, paper, and the printing industry, nitrogen, and phosphorous and phenolic compounds, as well as heavy metals from various sources. Due to its ecofriendly nature together with the availability and inexpensiveness of raw materials, biosorption via seaweed has become an alternative to the existing technologies in removing these pollutants from wastewater effectively. In this article, the use of low-cost adsorbent (seaweed) for the removal of pollutants from wastewater has been reviewed. An extensive table summarises the applicability of seaweed in treating wastewater. Literature reported that the majority of research used simulated wastewater and minor attention has been given to biosorption using seaweed in the treatment of real wastewater.

scholarly journals Activated Carbons from Miscanthus Straw for Cleaning Water Bodies in Kazakhstan

2019 ◽  
Vol 21 (3) ◽  
pp. 259
Author(s):  
K.E. Abit ◽  
L. Carlsen ◽  
A.A. Nurzhanova ◽  
M.K. Nauryzbaev
Keyword(s):  
Heavy Metals ◽  
Activated Carbon ◽  
Activated Carbons ◽  
Raw Materials ◽  
Low Cost ◽  
Water Bodies ◽  
Attractive Alternative ◽  
Experimental Conditions ◽  
Specific Pore Volume ◽  
Active Coal

Pollution of water bodies by heavy metals is an acute problem in Kazakhstan. Hence, search for and implementation of sustainable environmental technologies for water purification is of high priority. Activated carbon appears as an appropriate material as reflected in a number of previous studies. Due to a growing interest in low-cost active coals from renewable, rapidly recovering raw materials, especially for the purification of drinking water and wastewater, special attention has been in recent years been paid to the preparation activated carbons from some types of agricultural by-products. Along these lines a technology for producing new carbon-containing sorbents, i.e., activated carbon from Miscanthus straw (Мiscanthus × giganteus) is reported. The method of preparation, type of reactor, experimental conditions and the influence of the selected initial material on the properties of the resulting activated carbons are discussed. The activation of the primarily carbonized material in super-heated steam creates an activated coal material with a specific surface area of 541.9 m2/g and a specific pore volume of 0.232 cm3/g. The possible application for purification of water bodies from selected heavy metals was studied by estimation of the sorption capacity of the generated active coal material towards selected metal ions. The adsorption capacity for copper, zinc and lead ions is 90, 100, 500 mg/L, which allows to consider obtained by this method AC as an attractive alternative to traditional coal sorbents.

scholarly journals EMISSIONS MONITORING OF HEAVY METALS AND THEIR COMPOUNDS RESULTED FROM COMBUSTION PROCESSES IN CLINKER KILNS IN ROMANIA

2018 ◽  
Vol 24 (1) ◽  
Author(s):  
CRISTIAN CIOBANU ◽  
GHEORGHE VOICU ◽  
MAGDALENA – LAURA TOMA ◽  
PAULA TUDOR
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Contaminated Soil ◽  
Wastewater Treatment Plants ◽  
Raw Materials ◽  
Cement Plant ◽  
Combustion Gases ◽  
Waste Oils ◽  
Industrial Sources ◽  
Combustion Processes

<p>With the dust arising from the clinker kilns and grill coolers (the major pollution sources in a cement plant), also heavy metals and their compounds (in the form of powders and vaporous), originating from fuels and raw materials, are pumped into the air. The paper presents some aspects regarding the monitoring of heavy metals contained in the combustion gases from a Romanian cement factory. The fuels used in the incinerator varied from coal/petroleum coke, refuse oils (from waste oils and their emulsions, up to sludge, paraffin, tars, contaminated soil), rubber (including whole used tires), plastic, paper, leather, textiles, wood (including sawdust), as such or impregnated/contaminated with various substances from industrial sources or sorted household wastes, sludge (previously dried) from wastewater treatment plants. In addition, the list of over 100 types of waste that can be co-processed can be found in integrated authorizations of cement plants. However, the level of heavy metals in the combustion gases was in allowed limits.</p>

scholarly journals Wastewater Treatment for Heavy Metals and Dyes Using Low-Cost Biosorbents: A Review

2021 ◽  
Vol 44 (2) ◽  
pp. 47-56
Author(s):  
Andreea BONDAREV
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Aqueous Solutions ◽  
Industrial Wastewater ◽  
Dye Removal ◽  
Environmental Problem ◽  
Low Cost ◽  
Sorption Kinetics ◽  
Inorganic Cations ◽  
Sustainable Wastewater Treatment

The pollution of industrial wastewater with heavy metals and dyes is a highly important environmental problem, because of the propagation of the pollution and because of its unfavourable consequences. Sustainable wastewater treatment is one of the foremost challenges of this century. Various waste materials characterized by lignocellulose composition are low cost, non-conventional adsorbent for biosorptive removal of heavy metal ions from aqueous solutions. Recent studies point to the potential of use of low-cost materials (zeolites, carrot residue and green tea waste) as effective sorbents for the removal of Cd2+ from aqueous solution. The use of bentonite to the treatment of wastewater containing reactive dyes in aqueous solutions requires the modification of the hydrophilic surface by inorganic cations with organic cations exchange. The use of bentonite as an inexpensive sorbent for the removal of Remazol Brilliant Blue R (RBBR) from synthetic aqueous solutions has been also presented in recent studies. The influence of some parameters such as: pH, initial dye concentration, sorbent dose on sorption kinetics for dye removal has been reviewed in this paper.

scholarly journals OPTIMIZATION AND CHARACTERIZATION OF CALCINATED CHICKEN EGG SHELL DOPED TITANIUM DIOXIDE PHOTOCATALYST BASED NANOPARTICLES FOR WASTEWATER TREATMENT

2020 ◽  
pp. 79-83
Author(s):  
Yigezu Mekonnen Bayisa ◽  
Tafere Aga Bullo ◽  
Mohammed Seid Bultum
Keyword(s):  
Methylene Blue ◽  
Titanium Dioxide ◽  
Wastewater Treatment ◽  
Raw Materials ◽  
Low Cost ◽  
Initial Concentration ◽  
Titanium Dioxide Nanoparticle ◽  
Doped Titanium Dioxide ◽  
Titanium Dioxide Photocatalyst ◽  
Egg Shell

In recent decades, research concerning and knowledge about the external benefits of renewable raw materials have intensified the efforts for investigating the major sources, causes, and effects of wastewater from solid waste and industries or households. In this study bio-matter and low-cost photocatalyst was prepared for photodegradation on the removal of methylene blue from wastewater treatment, and characterized by Fourier-transform infrared (FTIR) spectroscopy, UV-spectrometer, and X-ray diffractometer (XRD). The effects of initial concentration of methylene blue, amount of dopant, and degradation time were investigated on the percentage degradation of methylene blue using the calcinated eggshell doped titanium dioxide nanoparticle catalysts. At sufficient contact time and low initial concentration, the increment in dopant dose from 0.5 to 2.5 g/l results in an increment of methylene blue degradation efficiency, from 52.5 % to 95.8%. It was shown that a calcinating eggshell doped titanium dioxide photocatalyst method for wastewater treatment is a promising option for the degradation of methylene blue from industrial wastewater under the stated condition.

scholarly journals EMISSIONS MONITORING OF HEAVY METALS AND THEIR COMPOUNDS RESULTED FROM COMBUSTION PROCESSES IN CLINKER KILNS IN ROMANIA

2017 ◽  
Vol 23 (1) ◽  
pp. 20-26
Author(s):  
CRISTIAN CIOBANU ◽  
GHEORGHE VOICU ◽  
MAGDALENA – LAURA TOMA ◽  
PAULA TUDOR
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Contaminated Soil ◽  
Wastewater Treatment Plants ◽  
Raw Materials ◽  
Cement Plant ◽  
Combustion Gases ◽  
Waste Oils ◽  
Industrial Sources ◽  
Combustion Processes

With the dust arising from the clinker kilns and grill coolers (the major pollution sources in a cement plant), also heavy metals and their compounds (in the form of powders and vaporous), originating from fuels and raw materials, are pumped into the air. The paper presents some aspects regarding the monitoring of heavy metals contained in the combustion gases from a Romanian cement factory. The fuels used in the incinerator varied from coal/petroleum coke, refuse oils (from waste oils and their emulsions, up to sludge, paraffin, tars, contaminated soil), rubber (including whole used tires), plastic, paper, leather, textiles, wood (including sawdust), as such or impregnated/contaminated with various substances from industrial sources or sorted household wastes, sludge (previously dried) from wastewater treatment plants. In addition, the list of over 100 types of waste that can be co-processed can be found in integrated authorizations of cement plants. However, the level of heavy metals in the combustion gases was in allowed limits.

scholarly journals Pumice Characteristics and Their Utilization on the Synthesis of Mesoporous Minerals and on the Removal of Heavy Metals

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
A. I. M. Ismail ◽  
O. I. El-Shafey ◽  
M. H. A. Amr ◽  
M. S. El-Maghraby
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Metal Removal ◽  
Raw Materials ◽  
Synthetic Zeolite ◽  
Raw Material ◽  
Ion Concentration ◽  
Crystallization Time ◽  
Highly Active ◽  
Zeolite P

Wastewater treatment of some heavy metals was carried out by synthetic zeolite P1, which was prepared by alkaline hydrothermal treatment of the pumice. Both of the pumice raw materials and synthetic zeolite were investigated for their chemical phase composition, physical properties, and microstructure. The adsorption behavior of Na-zeolite P1 with respect to Co+2, Cu+2, Fe+2, and Cd+2 has been studied to be applied in the industrial wastewater treatment. Metal removal was investigated using synthetic solutions at different ions concentrations, time, and Na-P1 zeolite doses as well as constant temperature and pH. It is concluded that the optimum conditions for synthesis of highly active Na-P1 zeolite from natural pumice raw material are one molar NaOH concentration, temperature at 80°C, and one week as a crystallization time. In addition to the effect of time and zeolite dose as well as the ion concentration of the reaction efficiency for metals removals are recorded.

scholarly journals Adsorption Studies of Chromium by Using Low Cost Adsorbents

Our Nature ◽  
2013 ◽  
Vol 11 (1) ◽  
pp. 11-16 ◽  
Author(s):  
N. Gandhi ◽  
D. Sirisha ◽  
K.B. Chandra Sekhar
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Contact Time ◽  
Low Cost ◽  
Water Bodies ◽  
Batch Adsorption ◽  
Toxic Heavy Metals ◽  
Adsorption Studies ◽  
Chromium Vi ◽  
Aqueous Streams

The presence of toxic heavy metals such as chromium (VI) contaminants in aqueous streams, arising from the discharge of untreated metal containing effluents into water bodies, is one of the most important environmental problems. Adsorption is one of the effective techniques for chromium (VI) removal from wastewater. In the present study, adsorbent was prepared from low cost adsorbents and studies were carried out for chromium (VI) removal. Batch adsorption studies demonstrated that the adsorbents had significant capacity to adsorb the chromium from aqueous solution. It was found that the adsorption increased with increase in contact time and adsorbent dosage. An attempt was made to study mixed algae as an adsorbent for removal of chromium (VI).DOI: http://dx.doi.org/10.3126/on.v11i1.8238 Our Nature Vol.11(1) 2013: 11-16?

Application of Geopolymer Composites in Wastewater Treatment

2019 ◽  
pp. 131-149
Author(s):  
Victor Odhiambo Shikuku ◽  
Tome Sylvain
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Water Treatment ◽  
Low Cost ◽  
Environmentally Benign ◽  
Adsorption Efficiency ◽  
Adsorption Mechanisms ◽  
Synthesis Properties ◽  
Removal Of Heavy Metals ◽  
Geopolymer Composites

Geopolymers are amorphous aluminosilicates with some varied applications. However, the use of geopolymers in water treatment is a relatively new subject. This chapter discusses developments in synthesis, properties and applications of geopolymers and their composites for removal of heavy metals and dyes from water including reduction of hardness in water. The adsorption mechanisms and effects of various environmental conditions on adsorption efficiency are also highlighted. The chapter demonstrates that geopolymers are low cost and environmentally benign materials for wastewater treatment and offers opportunities as alternative adsorbents for sequestration of various pollutants from water subject to further investigations.

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