Chemistry Journal of Moldova

Industrial chemistry

EVALUATION OF THE THERMAL BEHAVIOUR OF AGRICULTURAL WASTES FOR POSSIBLE USE IN THE BIOMASS PELLETS INDUSTRY

Author(s):

Alexandra Marcu, Gabriela Lisa, Ioana-Emilia Sofran, Ion Anghel, Manuel Serban


Field: Industrial chemistry
Type: Research paper
Issue: 2020 Volume 15, no.1
Pages: 58-66
Keywords: waste, biomass pellet, combustion heat, thermogravimetric analysis, microscale combustion calorimetry.
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DOI: http://dx.doi.org/10.19261/cjm.2020.717   
 
Abstract (PDF)
Supplementary Material (PDF)
Graphical Abstract: This paper tackles the potential uses of agricultural wastes (sawdust, sunflower seed shells, pumpkin seed shells, cherry pits, walnut shells, and green walnut shells) for the production of pellets. Combustion heat was determined for these wastes and their thermal decomposition in an air atmosphere was analysed. Five types of mini-pellets were made from different combinations of available wastes and their thermal behaviour was analysed by the microscale combustion calorimetry method.
 

 

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TREATMENT OF SECONDARY RAW MATERIALS BY INNOVATIVE PROCESSES

Author(s):

Stefano Ubaldini, Daniela Guglietta, Francesca Trapasso, Serena Carloni, Daniele Passeri, Adalgisa Scotti


Field: Industrial chemistry
Type: Invited paper
Issue: 2019 Volume 14, no.1
Pages: 32-46
Keywords: critical raw material, precious metal, circular economy, bio-hydrometallurgy, electrowinning.
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DOI: http://dx.doi.org/10.19261/cjm.2019.585 

Abstract (PDF)
Graphical Abstract: This paper presents an overview of the various innovative methodologies used in the recovery of valuable metals and critical raw materials from secondary sources. The review also highlights the used varieties of application on large scale in real situations and hopes to provide insights into valorization of spent sources.




Downloads: 94

METALLURGICAL COKEMAKING WITH THE IMPROVED PHYSICOCHEMICAL PARAMETERS AT AVDEEVKA COKE PLANT

Author(s):

Oleg Zelenskii, Yuriy Vasil’ev, Alexey Sytnik, Natalia Desna, Elena Spirina, Andrey Grigorov


Field: Industrial chemistry
Type: Research paper
Issue: 2018 Volume 13, no.2
Pages: 32-37
Keywords: coal, electrocorundum, carborundum, blend, coke.
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DOI: http://dx.doi.org/10.19261/cjm.2018.516   

Abstract (PDF) 
Graphical Abstract: The article presents the results of studies regarding the improvement of the qualitative characteristics of blast furnace coke obtained from modified coal blend in industrial conditions of Avdeevka Coke Plant. Inorganic corundum powders are applied to modify the coal blend, namely electrocorundum (α-Al2O3) and carborundum (α-SiC). The introduction of a specific quantity (0.25 wt %) of non-clinkering additives allows the modification of the processes that occur when the coal blend is plastic, with consequent improvement in coke strength.


 

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THE EFFECT OF RICE HUSK ON THE PHASE FORMATION AND CEMENT CLINKER PROPERTIES

Author(s):

Lev Chernyak, Liubov Melnyk, Natalia Dorogan


Field: Industrial chemistry
Type: Research paper
Issue: 2018 Volume 13, no.2
Pages: 24-31
Keywords: cement, clinker, rice husk, crystalline phase, property.
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DOI: http://dx.doi.org/10.19261/cjm.2018.502   

Abstract (PDF) 
Graphical Abstract: The features of the cement clinker when rice husk is used are investigated. The dependence of the raw mixture composition on the set product burning characteristics has been analysed using the software “CLINKER”. The mixture compositions have been identified on the basis of the chalk–clay–rice husk system, with the introduction of man-made stock of 6.0–18.0 mass %. The features of the phase composition and the binder properties, by varying the rice husk content, mixture ratio and burning temperature are shown.


 

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PREPARATION AND CHARACTERIZATION OF MICROFILTRATION CERAMIC MEMBRANES BASED ON NATURAL QUARTZ SAND

Author(s):

Andrei Ivanets, Vladimir Agabekov


Field: Industrial chemistry
Type: Research paper
Issue: 2017 Volume 12, no.1
Pages: 67-73
Keywords: ceramic, membrane, microfiltration, quartz sand.
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DOI: dx.doi.org/10.19261/cjm.2017.407 
 
Abstract (PDF)
Graphical Abstract:
 The effect of phase and chemical composition of natural quartz sand, binder and burnable additives was studied. The conditions of application of the membrane and biocide layers on the formation of porous ceramic and microfiltration membranes were investigated. It is shown that a crystalline oxide of Si(IV) is determinant for obtaining the ceramic materials. The presence of carbonates (calcite, dolomite, aragonite, etc.) and crystalline aluminosilicates (microcline, albite, phlogopit, etc.) leads to a decrease in mechanical strength of ceramics. The biocide coating designed to protect the ceramic membrane surfaces from biofouling was applied and its anti-bacterial activity was shown.


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A PERSPECTIVE FOR POOR WASTEWATER INFRASTRUCTURE REGIONS: A SMALL-SCALE SEQUENCING BATCH REACTOR TREATMENT SYSTEM

Author(s):

Narcis Barsan, Valentin Nedeff, Antonina Temea, Emilian Mosnegutu, Alexandra Dana Chitimus, Claudia Tomozei


Field: Industrial chemistry
Type: Research paper
Issue: 2017 Volume 12, no.1
Pages: 61-66
Keywords: municipal wastewater, Sequencing Batch Reactor (SBR), legislative regulations.
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DOI:
dx.doi.org/10.19261/cjm.2017.387

Abstract (PDF)
Graphical Abstract:
 Comparing the problems in Romania and Senegal, regarding wastewater treatment, the present paper aims to identify the best methods and techniques to treat the municipal wastewater in small treatment plants with sequential operation. This paper examines the possibility of using Sequencing Batch Reactor (SBR) process to treat the municipal wastewater characterized by low flow. This paper also presents a comparative analysis of the degree of purification achieved in a SBR wastewater treatment plant, as well as legislative regulations in Romania and Senegal. Finally, the paper identifies the possible uses of the treated wastewater in different household activities.


 

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NEURAL MODELING AND OPTIMIZATION OF A MECHANICAL-CHEMICAL TREATMENT APPLIED FOR SOME INDUSTRIAL EFFLUENTS. A ROUMANIAN CASE STUDY

Author(s):

Rodica Mariana Diaconescu, Carmen Zaharia


Field: Industrial chemistry
Type: Research paper
Issue: 2017 Volume 12, no.2
Pages: 19-27
Keywords: artificial neural network (ANN), industrial wastewater treatment, multilayers perceptron model (MLP).
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DOI:
dx.doi.org/10.19261/cjm.2017.394   
 
Abstract (PDF)
Graphical Abstract:  The paper proposes an artificial neural network model of multilayers perceptron type (MLP3:10:1) adapted for mechanical-chemical treatment system of an industrial effluent (i.e. coagulation-flocculation - sedimentation applied for an industrial effluent produced in a manufacturing plant of bricks and other ceramics) which is further optimized and tested for its validation.

Downloads: 43

EFFECT OF ALUMINIUM SULPHATE AGING ON COAGULATION PROCESS FOR THE PRUT RIVER WATER TREATMENT

Author(s):

Larisa Postolachi, Vasile Rusu, Tudor Lupascu


Field: Industrial chemistry
Type: Research paper
Issue: 2016 Volume 11, no.1
Pages: 27-32
Keywords: coagulation, Jar-test, aluminium sulphate, aging.
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2016.11(1).03

Graphical Abstract: 
Aluminium sulphate is one of the most widely used coagulants for water treatment and has been proven to be an effective coagulant for the removal of certain contaminants, turbidity and colour. Aluminium sulphate used during the coagulation process is hydrolyzed in the water, forming polynuclear complexes. Aged aluminium solutions show different coagulation behaviour than that of freshly prepared solutions. Obtained results reveal that using of optimal aging solution of coagulant improves the coagulation process. 

 

The article is Open Access by CC-BY 4.0 License

Cite this article as:
L. Postolachi, V. Rusu, T. Lupascu. Effect of Aluminium Sulphate Aging on Coagulation Process for the Prut River Water Treatment. Chemistry Journal of Moldova, 2016, 11(1), pp. 27-32. DOI: dx.doi.org/10.19261/cjm.2016.11(1).03

Article Source: Effect of Aluminium Sulphate Aging on Coagulation Process for the Prut River Water Treatment

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Downloads: 77

MODIFICATION OF CARBONACEOUS ADSORBENTS WITH MANGANESE COMPOUNDS

Author(s):

Irina Ginsari, Larisa Postolachi, Vasile Rusu, Oleg Petuhov, Tatiana Goreacioc, Tudor Lupascu, Raisa Nastas


Field: Industrial chemistry
Type: Short communication
Issue: 2015 Volume 10, no.2
Pages: 92-94
Keywords: active carbon, modification, manganese, surface chemistry, thermal treatment.
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2015.10(2).12

Graphical Abstract:
 Four series of samples containing manganese supported carbonaceous adsorbents were prepared. Obtained results reveal the importance of surface chemistry of carbonaceous adsorbents on the manganese loading.


Downloads: 47

REMOVAL OF REMAZOL ROSSO RB DYE FROM AQUEOUS EFFLUENTS BY HOMOGENOUS FENTON OXIDATION PROCESSES

Author(s):

Carmen Zaharia, Victoria Fedorcea, Adrian Beda, Victor Amarandei, Augustin Muresan


Field: Industrial chemistry
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 74-79
Keywords: decoloration, Fenton reagent, homogenous advanced oxidation process, optimal operating parameter, Remazol Rosso RB dye, textile effluent treatment
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Abstract (PDF)

DOI:
dx.doi.org/10.19261/cjm.2014.09(1).08

Graphical Abstract:
 The paper presents some data from our laboratory-setup experiments of homogenous oxidative processes with hydrogen peroxide (i.e. advanced Fenton oxidation processes) applied for Remazol Rosso RB dye-containing aqueous systems, especially textile effluents. Therefore, some different operating parameters (including pH, concentration of dye, H2O2 and ferrous ions, oxidation time, temperature, stirring regime, among its) were tested for determination of the best performance in effluent decoloration and dye removal, meaning the optimal values of each studied parameters for highest decoloration or dye removal.

Downloads: 32