Kiril Lisichkov

Saints Cyril and Methodius University of Skopje · Faculty of Technology and Metallurgy

Applying green engineering principles to conventional fish processing bio-waste (viscera matrixes) suggests its reconsideration as a secondary raw material rich in highly valued polyunsaturated omega-3 and omega-6 fatty acids. Supercritical fluid carbon dioxide extraction was introduced as a separation technique with a minimal ecological footprint....

Over recent years, the food industry has striven to reduce waste, mostly because of rising awareness of the detrimental environmental impacts of food waste. While the edible oils market is enlarging constantly, there is increasing interest in producing plant-based oils because of the presence of various bioactive components like mono and poly unsat...

Stabilized activated sludge was used as a low-cost and efficient biosorbent for removing Cu(II) ions from an aqueous solution. The effects of contact time and initial Cu(II) concentration on adsorption efficiency were investigated. Response surface methodology (RSM) was employed to develop a predictive mathematical model and optimize the adsorption...

Lycopene is a carotenoid highly valuable to the food, pharmaceutical, dye, and cosmetic industries, present in ripe tomatoes and other fruits with a distinctive red color. The main source of lycopene is tomato crops. This bioactive component can be successfully isolated from tomato processing waste, commonly called tomato pomace, mostly made from t...

Hexavalent chromium is a toxic form of chromium that has significant health and environmental implications. Reducing hexavalent chromium to trivalent chromium is a crucial step in immobilizing and removing Cr(VI) from water resources. Nano zero-valent iron (nZVI) as an electron-donating agent was used for Cr(VI) reduction in aqueous solution. The e...

Acetaminophen is widely used for musculoskeletal pain management, generally for arthritis, in elderly people and for reduction of fever in colds, flu and infections. Using the acetone/liquid paraffin solvent system, cellulose-based-microparticles were prepared by the emulsion solvent evaporation technique. The aim of this work was to evaluate the i...

In this study, response surface methodology (RSM) was used for the determination of the effect of two process parameters (extraction temperature and extraction time) and their interaction on the yield of the total extract from white mustard seeds (Sinapis alba l.), as well as the creation of a mathematical model, 3D response surface, and the establ...

Dry tomato peels were investigated as a natural source of lycopene in this study. Microwave-assisted extraction (MAE) was used for the isolation of bioactive compound of interest. The MAE was performed at a microwave power of 120, 230, and 385 W for a duration of 2, 5, 8, and 10 min. The concentration of lycopene in the separated extract with n-hex...

The raw material Helichrysum is used for the treatment of various pathological conditions in folk and modern medicine, for the treatment of tropical infections, respiratory diseases and as a detoxifying herbal medicine. Extraction is the most appropriate method for separating the active ingredients from plant materials. Separated bioactive componen...

The increase of the population and the industrial development, lead to enormous environmental pollution. Various types of waste containing heavy metals are produced and discharged into water resources. Heavy metals are considered to be the main source of contamination that causes serious environmental problems. The polluted water becomes unusable a...

Hexavalent chromium has been identified as a frequent pollutant in soils, wastewater, and groundwater. Hexavalent chromium Cr(VI) is toxic and carcinogenic to humans. Cr(VI) is a persistent pollutant that is not susceptible to biodegradation, hence it remains in the environment for a long time. In aqueous solutions, Cr(VI) was found in the species...

This paper compares the percentage of removal of Cr(VI) ions from aqueous solutions with pure diatomite and clayey diatomite. To characterize the adsorbents, the following analyses were performed: classical silicate chemical, differential thermal and thermogravimetric, X-ray dispersive, Fourier transform infrared, scanning electron microscopy, and...

In the last decade the application of membrane separation technology is more increasing. The membrane in water purification and wastewater treatment is essential separation process used for water reclamation. The production of new membrane types with different permeable characteristics and performances allows them to be fitted in different membrane...

Obesity has become a serious global problem that still needs a solution. One of the factors that leads to obesity is genetic predisposition. The identity and characteristics of the genes involved have not yet been fully confirmed. Analyzing the genetic contribution to obesity is a major step towards the solution. In this in silico study, using onli...

The clayey diatomite from the village of Suvodol (Bitola region) used in this research has shown to be a very effective and efficient natural material for the removal of Cr(VI) ions from aqueous solutions. The adsorption of Cr(VI) ions onto a clayey diatomite was shown to occur very efficiently with 96.7%. During the experiments the effect of opera...

The mosquitoes are a serious threat to public health, since they are known vectors of many life-threatening diseases. Mosquito-borne diseases cause millions of deaths worldwide every year. While mosquitoes are important to maintain ecosystems, the aim is to keep them out of our personal space. People looking for alternatives to synthetic mosquito r...

We live in a time that imposes a general ecological struggle for a healthier and better life. Exhaustive lifestyles require a rapid increase in research in the food industry, in order to improve food quality and to respond to the demands of the human organism. Consumers demand from the modern chemical industry to develop new technologies that will...

Wormwood (Artemisia absinthium L.) is a medicinal and an aromatic bitter herb, which is a source for separation of many important bioactive compounds. In this thesis, the chemical composition of essential oils separated by steam distillation from wormwood was reviewed and discussed, by processing data and results from a number of studies and resear...

This study is focused on the groundwater system of the Rashche Spring which serves as the main source of drinking water for the City of Skopje, located at the foot of the widely karstified Zeden massif. Investigations were made to define the mechanisms of groundwater recharge and its residence time. This was done using isotope tracers including ¹H,...

The physico-mechanical, chemical and mineralogical characteristics of volcanic glass (perlite) from the Mariovo region (Macedonia) as well as the mineralogical changes that occur during its thermal treatment were investigated to demonstrate its utilization for industrial use. The native perlite was characterized by chemical analysis, X-ray powder d...

Zeolites are nano-porous crystalline aluminosilicates. Natural zeolites are non-toxic and safe for humans which expand their application in different fields. Clinoptilolite is the most abundant natural zeolite with high purity that occurs in many parts of the world. It has a frame structure in which the tetrahedra of silicon [SiO4/2] and aluminium...

Within this paper, investigations were carried out in order to obtain data for determining the maximum absorption capacity and the conditions in which the balance in the systems occurs: Mn2+ ions - expanded perlite and Mn2 + ions - carbonized sunflower husks. A series of tests were performed using model solutions of Mn2+ ions with different concent...

This paper deals with estimation of methane emissions from the Mirash municipal solid waste sanitary landfill. Methane emission was calculated according to two different methodologies, namely, IPCC 2006 and LandGEM. Within the framework of the research, the following parameters were evaluated: amount of landfilled waste, landfill characteristics, a...

In this article the possibility of removal of Mn (II)-ions from aqueous solutions with the use of grape branches as an adsorbent was investigated. For the realization of the set goal during the experimental investigations, the influence of the following operating parameters was examined: the initial concentration of Mn (II) ions in the solution (10...

The presence of some chemical compounds at higher levels than maximum permissible concentrations (MPC) in the drinking water, suggests of water resources pollution. In this paper the following elements were analyzed: total arsenic, cadmium, lead, cooper and zinc. Twelve samples of water from the water supply system from the city of Skopje were exam...

The availability of clean water is a challenge around the world. In recent decades, environmental pollution through the excessive discharge of organic and inorganic water in water contributes to large quantities of wastewater. These halts are a major threat to the surrounding ecosystem and human health if they are not treated before being discharge...

The results of the water retention curves between (pF-2 and-4.2) matric potential for two substrates perlite and peat, are presented in this paper. Perlite is an inorganic, expanded aluminosilicate of volcanic origin. Peat is an organic substrate. For assessing this parameter, the method of bar extractors and Porous plate extractors have been explo...

The aim of this article is characterization of natural zeolite (clinoptilolite) and its application for removal of heavy metals from aqueous solution. Characterization of the natural zeolite from Beli Plast deposit, Kardjali, was conducted using: classical chemical analysis, XRD, SEM/EDS, DTA/TG/DTG, XRF, FTIR and BET. Based on the results of the c...

Wastewater that contains heavy metal ions is considered as the serious threat for environmental pollution. Most of the heavy metals are toxic and their ions are not biodegradable with the tendency to accumulate in the soil and in the living organisms, and hence they are significant environmental pollutants. Therefore, the treatment of the heavy met...

The toxicity and non-biodegradation of heavy metals, as well as their tendency to accumulate in the soils, water resources and the living organisms, makes them the significant environmental pollutants. Therefore, the reduction and elimination of heavy metal ions from aqueous systems is very important from the ecological, nutritional and environment...

The goal of this work is isolation and characterization of biological active compounds in fish caviar, viscera and fillet obtained from fresh water carp (Cyprinus carpio L.) from Tikveš Lake, Republic of Macedonia. A solid-liquid extraction by Soxhlet method was applied in order to obtain total extracts from analyzed samples of animal origin. Durin...

In the frame of this investigation the possibility of the removal of Ni(II) ions using trepel as raw material, which originated from R.Macedonia coal bearing. The presence of Ni(II) ions in aquatic environments, which is consequence from various geodes and anthropogenic factors, is a current issue in the environmental engineering. Therefore for the...

Removing hexavalent chromium from contaminated wastewater is very important because of toxicity to living organisms. Chromium is carcinogenic and mutagenic in very low concentration values (sub-ppm). The ability of the natural mineral (bentonite) for adsorption of hexavalent chromium, Cr(VI), from aqueous solutions was investigated. The influence o...

Creating an excellent management team is one of the vital components within any organization aiming to success or to maintain the same. The authors conducted a research using two questionnaires: the manager success assessment (MSA) questionnaire and Hay’s questionnaire for determining the working styles. The results provided by this survey within a...

The aim of this research is to obtain light ceramic products from the reaction of diatomite with calcium hydroxide and trepel with calcium hydroxide. Diatomite is a loose, soft, porous, weakly bound rock with white to grayish color. Trepel is a natural mixture of diatomite and clay minerals. During the hydrothermal reaction of diatomite and trepel...

In this study the 3D surface model was successfully applied in investigating the influence of theprocess parameters on the physical and mechanical properties of the glass-ceramics. Glassceramicswas produced from coal fly ash and waste glass through the sintering method. The rawmaterial was taken from “REK Bitola”, a thermal power plant in the Repub...

In this chapter wastewater treatment and water resource management are discussed and analyzed. The goal of this chapter is to deepen the knowledge of application of adequate, precise process eco-technologies in the wastewater treatment from scientific and applicative aspect. This represents an ongoing problem in the modern process eco-engineering....

Natural minerals from different localities in the Republic of Macedonia are selected for elimination of Cr(VI) ions from water resources. For that aim are selected: aksil (Kriva Palanka), trepel (Bitola), SiO2 amorphous (Kozuf), pemza (Bojanciste). In this study, their adsorption capacity is analyzed using spectrophotometric method (UV/VIS Spectrop...

A broad spectrum of solid-liquid extraction techniques is used for isolation of the biological active compounds, for receiving natural products from plant material. For this purpose, different types of polar and non-polar extractive agents (solvents) are used. White mustard seeds are a natural material of which natural oil is extracted. Ultrasound-...

The aim of this research is to obtain light ceramic products from the reaction of trepel with calcium hydroxide. Trepel is a natural mixture of diatomite and clay minerals. Trepel as raw materials has the following physical properties: bulk density 0.77 – 0.93 g/cm3, water absorption 67 – 79 %, open porosity 52-67 %, total porosity 67-76%, specific...

The heavy metals pollution is a serious environmental problem, especially the presence of the hexavalent chromium ions in the water resources. The removal of Cr(VI) from wastewaters is a necessity especially because of its toxicity for the living beeings and the environment. Among viable options, natural inorganic materials are considered as possib...

The novel trends in green separation processes impose the need for application of natural, low-cast and high-efficiency selective adsorbents, such as natural zeolite, within the processes for the treatment of drinking water supplies. Lately, nano-porous inorganic sorbents represent an ongoing trend for elimination of heavy metals from water resourc...

Heavy metal pollution is a serious problem for the environment, and therefore it is very important to enable cost-effective heavy metal ions removal from the contaminated water. Among viable options, natural inorganic materials are considered as possible sorbents for the heavy metal ions elimination. The aim of this work is to investigate the adsor...

The rapid and frequent fluctuation of managers within an organization is likely to have a negative impact on the overall performance of the organization itself. Therefore, the assessment of the success of the potential manager within the organization is highly important with regards to saving the time and money of the organization, in terms of inve...

In this chapter wastewater treatment and water resource management are discussed and analyzed. The goal of this chapter is to deepen the knowledge of application of adequate, precise process eco-technologies in the wastewater treatment from scientific and applicative aspect. This represents an ongoing problem in the modern process eco-engineering....

A three-layer artificial neural network (ANN) model was developed to predict the efficiency of Cd(II) ion removal from aqueous solutions by nano-porous zeolite, based on 105 experimental sets obtained in an experimental kinetic study. The effects of operational parameters such as the initial concentration of Cd(II) ions in the aqueous solution, the...

Two raw materials were investigated to provide a cheap and efficient arsenic removal from drinking water supply. For this purpose, studied materials were modified by insertion of iron within the materials’ structure and substitution of calcium and magnesium ions with sodium ions in order to improve the sorptive and ion-exchange properties. White tu...

Two commercially available adsorbents, white tuff from Strmos region and a material with a commercial name Zeofit obtained from Palanka region, were investigated as possible raw materials for adsorption of arsenites and arsenates from aqueous solutions. These raw materials were modified through chemical insertion of iron within the basic material s...

Available online xxx Keywords: Square-wave voltammetry Electrode kinetics sw amplitude Surface confined electrode reaction Quasireversible reaction of a dissolved redox couple a b s t r a c t A simple methodology for kinetic measurements of electrode processes is proposed under conditions of square-wave voltammetry (swv) at a constant scan rate of...

: Fly ash, a waste by-product obtained in a thermal power plant has been a generated problem of the disposal all over the world. Morphological characteristics, physicochemical properties and pozzolanic activity make this waste potential material for production of ceramics. In this study high density ceramics compacts were produced by using fly ash...

In addition to the relevant geological, hydro-geological and hydro-meteorological data, the distribution of the Environmental isotopes, O-18/O-16, H-2/H-1 and Tritium concentrations in the local hydrological cycle (precipitation, surface, ground and Spring waters), have been observed and analyzed, all in order to determine the mechanism of recharge...

Snail meat is used daily in the human diet. Snails are used in human nutrition daily in some regions of the world. According to measurable attributes of proteins and lipids quality, snails fall into the middle category of this source of nutrients. The paper describes nutritive attributes of snail’s quality from the aspect of macro and micro nutrien...

The paper describes the general cleaner production aims, which are correspond to the prevention criteria of the IPPC-Directive. It presents cleaner production practices and technologies and examines the methods of successful application of cleaner production practices in companies, which want to realize ecological targets. The minimization of waste...

The paper presents the results achieved during the process of nickel removal from aqueous solutions by adsorption on alumina (Aluminum oxide) in continuous conditions. The continuing experiments were conducted in a glass column with diameter of 16 mm and fixed bed of adsorbent with quantity ranging from 30 to 115 g, adsorbent grains size from 1.0 t...

SYNOPSIS The Black Sea fisheries diagnostic analysis has been performed under the initiative of the Black Sea Commission for the long-term period. Some of the most important pressure and state indicators with significant impact on the environment reveal the increasing trophic level in the last investigated years, indicating higher abundance of spec...

The goal of this work is isolation of tomato seed oil from the tomato waste (skin and seed) from tomato processing industry by utilization of non-conventional, green solvent technology. In the frames of experimental research, the influence of working parameters (temperature, pressure and extraction time) on the total yield of isolated tomato seed o...

Estimation of the optimum levels of exploitation for the sprat is based on using the structured and non structured equilibrium models for the north-western part of the Black Sea. In the present paper, based on the concept of Maximum Sustainable Yield (MSY), some sustainable yield curves have been created. It was found for the Black Sea sprat that y...

For proper fisheries management it is important to know fishing effort. One of the main problems in the Black Sea region is the lack of comprehensive information concerning the fishing activity, catch quantities and composition and how it affects the current state of fish stocks. We identified that the implementation of the fishing vessels monitori...

estimation of the optimum levels of exploitation for the sprat is based on using the structured and non-structured equilibrium models for the northwestern part of the Black Sea. in the present paper, based on the concept of maximum sustainable yield (mSy), some sustainable yield curves have been created. it was found for the Black Sea sprat that yi...