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Prvi deo doktorske disertacije sadrži uvid u procenu ekološkog uticaja proizvodnje električne i toplotne energije u Srbiji. Kao najčešći energent koristi se lignit, pa su poređeni eko-energetski uticaji lignita i rastvorenog naftniog gasa. Rastvoreni naftni gas je razmatran kao potencijalni energent u tri scenarija: • na bakljama, • u kotlovima na naftnim poljima, • u kogenerativnim postrojenjima na naftnim poljima. Ispitana je ekološka isplativost tri pomenuta scenarija kroz analizu materijalih tokova i procene uticaja na životnu sredinu pomoću LCA (life cycle assessment) metodoligije i podacima koji su prikupljeni na osnovu merenja na naftnim poljima. Koristiće se parametri koji ukazuju na uticaj globalnog zagrevanja, GWP (global warming potential) i iscrpljivanje energetskih resursa, CED (cumulative energy demand) uz osvrt na osetljivost sistema na iskorišćenje toplotne energije. Detaljna ekonomska analiza i gubici koji proističu od emisija gasova koji izazivaju efektat staklene bašte su procenjeni Maihach-ovom metodom. Metoda omogućava određivanje troškova tj. uštede nastale smanjenjem emisije CO2 i drugih gasova koji izazivaju efekat staklene bašte usled sagorevanja lignita i rastvorenog naftnog gasa u tri scenarija. Drugi deo disertacije bavi se uspostavljanjem simulacije kogenerativnih postrojenja u softveru ASPEN PLUS kako bi se stekao uvid u energetske i materijalne bilanse procesa što će omogućava precizniju procenu ukupne efikasnosti sistema. Ukupna efikasnost sistema isključivo zavisi od uspešnog iskorišćenja toplotne energije što je usko vezano za ekonomsku isplativost izgradnje postrojenja. Uspešna računarska simulacija kogenerativnih postrojenja pruža uvid u variranje procesnih parametara pomoću kojih je moguće izvršiti optimizaciju kogenerativnih postrojenja na naftnom polju u odnosu na sastav gasa. Rezultati ove doktorske disertacije daju detaljan uvid u rad kogenerativnih postrojenja, što doprinosi daljem razvoju tehnologije kogeneracije na naftnim, The first part of the doctoral dissertation contains an insight into the assessment of the environmental impact of electricity and heat production in Serbia. Lignite is used as the most common energy source, so the eco-energy effects of lignite and dissolved petroleum gas are compared. Dissolved petroleum gas was considered as a potential energy source in three scenarios: • on torches, • in boilers in oil fields, • in cogeneration plants in oil fields. The ecological viability of the three mentioned scenarios was examined through the analysis of material flows and environmental impact assessment using LCA (life cycle assessment) methodology and data collected on the basis of measurements in oil fields. Parameters indicating the impact of global warming, GWP (global warming potential) and depletion of energy resources, CED (cumulative energy demand) will be used, with reference to the sensitivity of the system to the use of thermal energy. Detailed economic analysis and losses resulting from greenhouse gas emissions were estimated by the Maihach method. The method enables the determination of costs, ie. savings resulting from reduced emissions of CO2 and other greenhouse gases due to the combustion of lignite and dissolved petroleum gas in three scenarios. The second part of the dissertation deals with the establishment of simulation of cogeneration plants in the software ASPEN PLUS in order to gain insight into the energy and material balances of the process, which allows a more accurate assessment of the overall efficiency of the system. The overall efficiency of the system depends exclusively on the successful use of thermal energy, which is closely related to the economic profitability of plant construction. Successful computer simulation of cogeneration plants provides insight into the variation of process parameters by which it is possible to optimize cogeneration plants in the oil field in relation to the gas composition. The results of this doctoral dissertat

Fokus ove doktorske disertacije je razvijanje modela zasnovanog na konceptu veštačkih neuronskih mreža za predviđanje i projektovanje mikrofiltracije kultivacionih tečnosti preko ispitivanja mogućnosti primene ovog koncepta za modelovanje fluksa permeata pri različitim uslovim a mikrofiltracij e, u sistemima sa i bez primene hidrodinamičkih metoda poboljšanja fluksa permeata i njihove kombinacije, kao i razvoj modela kojim će se objediniti eksperimentalni rezultati u cilju dobijanja jedne jedinstvene neuronske mreže za simulaciju svih metoda poboljšanja fluksa. Dodatan cilj predstavlja razvoj modela za procenu poboljšanja fluksa u stacionarnim uslovim a usled primene metoda poboljšanja fluksa permeata čija će se adekvatnost proveriti sa energetskog stanovišta. Eksperimentalna ispitivanja su obuhvatila razvoj i validaciju deset različitih modela neuronskih mreža kod kojih su nezavisne ulazne promenljive i njihovi rasponi (transmembranski pritisak, protok suspenzije i protok vazduha) utvrđeni Box-Behnken-ovim eksperimentalnim planom uz dodatne parametre vreme trajanja mikrofiltracije i temperature koji su varirani u zavisnosti od uslova izvođenja postupka mikrofiltracije. Nasuprot tome, za razvoj dinamičkog modela u svojstvu zavisno promenljive veličine razmatran je pad fluksa permeata sa vremenom, dok je za razvoj modela procene efikasnosti primenjenih metoda poboljšanja fluksa permeata razmatran fluks i specifična potrošnja energije u stacionarnim uslovima. Normalizacijom eksperimentalnih podataka izbegla se velika razlika u specifičnim težinskim koeficijentim a pojedinih ulaznih promenljivih i predupredila opasnost da te promenljive pokažu veći uticaj nego što ga imaju u realnosti, a balansiranje efekata nekontrolisanih faktora na izlaznu promenljivu izvedeno je randomizacijom na grupu za obučavanje (70% podataka), grupu za validaciju (15% podataka) i grupu za testiranje (15% podataka). Nestacionarnosti koje utiču na efikasnost algoritma obuke i arhitekture neurons, Focus of this doctoral dissertation is to develop a model based on the artificial neural networks concept for predicting and designing cultivation broth microfiltration by examining the feasibility of this concept for modeling permeate flux under different microfiltration conditions, in systems with and without hydrodynamic im provem ent methods, as well the development of a model that will combine the experimental results in order to obtain a single neural network to simulate all methods of flux improvement. An additional goal is the development of a model in quasi steady state in term so fadequacy of flux enhancement methods application, which will be checked from the energy point of view. Experimental tests included the development and validation of ten different models оf neural networks in which the independent input variables and their ranges (transmembrane pressure, suspension flow and air flow) were determined by Box-Behnken's experimental plan with added microfiltration parameters time and temperature, varied depending on the conditions of the microfiltration procedure. In contrast, for the development оf a dynamic model as a dependent variable, the decrease in permeate flux with time was considered, while for the development of a model for evaluating the efficiency оf applied permeate flux im provement methods, flux and specific energy consumption in quasi steady state conditions were considered. Normalization of experimental data avoided a large difference in specific weight coefficients of individual input variables and prevented the danger that these variables show a greater impact than they have in reality, and balancing the effects of uncontrolled factors on the output variable was performed by randomization on the training group (70% o f data), a validation group (15% of data) and a testing group (15% of data). Non-stationarities affecting the efficiency of the training algorithm and neural network architecture were avoided by testing the model with

Cilj ove doktorske disertacije je da dâ doprinos u proučavanju nedovoljno poznatih fenomena koalescentne filtracije, kako bi se smanjio obim potrebnih poluindustrijskih istraživanja prilikom projektovnja filtera za neku konkretnu primenu. Svi materijali korišćeni u ovoj doktorskoj disertaciji su otpadni materijali, čija primena kao filtarskog punjenja predstavlja poseban doprinos održivom razvoju. Jedan od ciljeva ove doktorske disertacije je proučavanje istovremenog uticaja promene permeabilnosti sloja i debljine vlakana na osobine sloja, pad pritiska i efikasnost separacije dispergovanog ulja iz kontinualne vodene faze. Uticaj geometrije sloja proučavan je na slojevima homogene i heterogene geometrije po dubini. Realizovano je detaljno ispitivanje izgleda, morfologije vlakana, kao i strukture sloja, izgleda i rasporeda njegovih pora, primenom skening elektronske mikroskopije i optičke mikroskopije. U radu je dat pregled istraživanja primene vlakana različite prirode (slobodnih i međusobno povezanih, krutih i elastičnih, različite debljine te time i različite vijugavosti) i njihovih slojeva. Takođe, dat je doprinos proučavanju istovremenog uticaja promena ulazne koncentracije dispergovane faze i permeabilnosti sloja. U veći deo ostvarenih istraživanja ukjučeno je i proučavanje uticaja prirode uljne faze, pri čemu je neophodno istaći da su sva korišćena ulja mineralnog porekla. Cilj optimizacije rada koalescera bio je da se pronađu uslovi u kojima se postiže maksimalna vrednost kritične brzine uz minimalni pad pritiska., The aim of this doctoral dissertation is to contribute to the study of insufficiently known phenomena of coalescent filtration, in order to reduce the number of pilot plant experiments required for designing filters for some specific applications. All the used materials are waste materials the use of which as a filter media contributes to sustainable development. One of the goals of this doctoral dissertation is to study the simultaneous effect of changes in bed permeability and fiber thickness on bed properties, pressure drop and the efficiency of the dispersed oil separation from a continuous aqueous phase. The effect of bed geometry was studied by applying the beds of homogeneous and heterogeneous geometry in depth. A detailed examination of the appearance and morphology of the fibers, as well as the structure of the bed and the appearance and arrangement of its pores, was performed by scanning electron microscopy and optical microscopy. The doctoral dissertation gives an overview of the testing of fibers of different nature (free and interconnected, rigid and elastic, of different thickness and thus of different meandering) and their beds. The simultaneous effect of the changes in the input dispersed phase concentration and the bed permeability was also investigated. Much of the conducted research includes the study of the impact of the nature of the oil phase, and it is necessary to point out that all used oils are mineral oils. The goal of optimizing the operation of a coalescer was to find the conditions providing the maximum critical velocity value with a minimum pressure drop.

Sporedni proizvodi industrijske prerade voća, trop borovnice i maline, postupcima sušenja i mlevenja prevedeni su u oblik pogodan za aplikaciju u prehrambene proizvode. Ovako dobijeni sastojci imaju visok sadržaj prehrambenih vlakana, esencijalnih masnih kiselina poput linolne i α-linolenske, a karakteriše ih i izbalansiran odnos PUFA/SFA. Od makronutrijenata, u najvećoj koncentraciji prisutni su K, Mg i Ca. Imajući u vidu da su glavne fitohemikalije bobičastog voća polifenolna jediinjenja, u proizvedenim funkcionalnim sastojcima određen je sadržaj ukupnih rastvorljivih polifenola, antocijana i flavonoida, kao i sastav i sadržaj odabranih polifenolnih jedinjenja primenom LC/MS-MS tehnike. Primena osušenih i samlevenih tropova kao sastojaka prehrambenih proizvoda ispitana je u formulaciji bezglutenskog keksa, sa ciljem njegovog funkcionalnog obogaćivanja. Za optimizaciju formulacije keksa korišćen je postupak odzivne površine (RSM), a formulacija u kojoj je bezglutenska smeša zamenjena sa 28,2% tropa borovnice i 1,8% tropa maline dobijena je kao optimalna, uzimajući u obzir sve zadate kriterijume. Dodatkom ova dva funkcionalana sastojka u gorenavedenom odnosu, postignuto je značajno poboljšanje nutritivnih svojstava bezglutenskog keksa, a dobijeni proizvod po kvalitetu može da parira komercijalno dostupnim funkcionalno obogaćenim keksovima, namenjenim zdravoj populaciji. Rezultati dijetetske interventne studije sprovedene na 20 zdravih, normalno uhranjenih ispitanika ženskog pola, ukazuju da se konzumiranjem kreiranog bezglutenskog keksa u količini od 32 g dnevno, postiže značajna redukcije LDL holesterola, i povećanje nivoa adiponektina u krvi, a budući da se ovaj adipocitni-sekretorni protein dovodi u vezu sa antiinflamatornim i antiaterogenim potencijalom u tretmanu metaboličkog sindroma i dijabetesa tipa 2, može se očekivati protektivno dejstvo kreiranog bezgutenskog keksa., Blueberry and raspberry pomace, by-products from fruit juice industry, were processed into the new food ingredients by drying and grinding. The obtained functional ingredients are characterized by high content of dietary fibres and essential fatty acids (linoleic and α-linolenic acid), as well as by optimal ratio of PUFA/SFA. The main macronutrients in dried and ground pomace are K, Mg and Ca. The content of total phenolic compounds, anthocyanins and flavonoids were determined, as well as composition and content of individual phenolic compounds using LC/MS-MS in order to evaluate their antioxidant potential. In the form of dried powder, blueberry and raspberry pomace were used as ingredients in formulation of gluten-free cookies. Response surface methodology (RSM) approach was applied to obtain optimal ingredients proportion. Formulation in which gluten-free flour mixture is substituted with 28.2% of the blueberry and 1.8% of the raspberry pomace was found to be optimal following the used optimization criteria. Addition of blueberry and raspberry pomace has led to a remarkable improvement in nutritional properties, and resulted in a product with similar nutritional profile with commercially available gluten containing cookies. Dietary intervention study on a group of 20 healthy, normal weight female subjects was conducted to investigate the health effect of the created gluten-free cookies. The results showed a significant reduction in levels of LDL cholesterol, and an increase in plasma concentrations of adiponectin, suggesting a potential positive effect of the created product on human health.

Cilj ovog rada je ispitivanje mogućnosti uklanjanja visokih koncentracija organskih i neorganskih materija iz vodenih rastvora „Cross-Flow“ nanofiltracijom primenom spiralno uvijenih membrana. Mogućnosti separacije NOM-a, amonijum-jona i ukupnog arsena su ispitivane na koncentratima-otpadnim vodama dobijenim iz industrijskih nanofiltracionih uređaja i obuhvaćeni su eksperimentima serije NFCP. Izdvajanje visokih koncentracija jona kalcijuma, magnezijuma, gvožđa i mangana je ispitivano iz prirodnih podzemnih voda i izvedeno je u eksperimentima serije NFWP. Određeni su optimalni fluksevi i transmembranski pritisci, kao i koncentracije doziranja kompleksirajućih supstanci. Dobijeni poluindustrijski rezultati su praktično primenjivi u velikoj skali za pripremu pijaće vode kako iz dubokih, tako i iz plitkih akvifera. Primena prikazanih rezultata u pripremi vode za piće od vode dubokih izdani uz značajne uštede resursa je namenjena prvenstveno lokacijama u Panonskom basenu. Tretman bunarske vode plitkih izdani je pogodan posebno zbog dodatka organskih kompleksirajućih agenasa koji supstituišu uobičajene postupke deferizacije i demanganizacije i na taj način znatno smanjuju kako investicione, tako i eksploatacione troškove postrojenja. Dobijeni rezultati su poslužili kao osnova za izradu idejnog rešenja industrijskog postrojenja za kondicioniranje pijaće vode od bunarske vode duboke izdani iz regiona grada Zrenjanina, kao i izradu idejnog rešenja industrijskog postrojenja za kondicioniranje pijaće vode od bunarske vode plitke izdani regiona grada Bačke Palanke za naseljeno mesto Despotovo., The goal of this thesis was to examine removal possibility of high concentrations of organic and inorganic matter from aquatic solution using “Cross-flow” spiral wound nanofiltration membranes. Natural organic matter, ammonia ions and total arsenic removal was examined using concentrates – waste water obtained from industrial nanofiltration plant and they present NFCP experiment series. Removal of high concentrations of calcium, magnesium, iron and manganese ions was a part of NFWP experiments and was conducted using natural groundwater. Optimal fluxes and transmembrane pressures, as well as complexing substances dosage concentrations were determined. Obtained results in semi industrial scale are practically applicable on the large scale plants for drinking water preparation from deep wells, as well as from shallow aquifers. Application of presented results, concerning drinking water preparation from deep wells with significant savings of water resources, is designed especially for locations in Pannonia basin. Shallow aquifer well water treatment is applicable in practice especially because of addition of organic complexation agents that substitutes conventional deferization and manganese removal methods ultimately reducing investment and exploitation costs. On the basis of obtained results, industrial plant that produces drinking water from Zrenjanin aquifer deep well was designed. Furthermore, potable water industrial plant was designed that used shallow aquifer well water located in Bačka Palanka region, settlement Despotovo.

Cilj istraživanja u okviru ove doktorske disertacije bio je da se ispita uticaj ekstrudiranja na funkcionalno hranivo, čija bi osnovna uloga bila povećanje sadržaja omega-masnih kiselina u ishrani životinja, a naročito α-linolenske kiseline (ALA). Za proizvodnju funkcionalnog hraniva upotrebljeni su laneno seme, kao nosilac funkcionalnih osobina i suncokretova sačma, koja je dodata da se spreči isticanje lanenog ulja tokom ekstrudiranja. Nezavisni parametri ekstrudiranja čiji je uticaj ispitivan bili su: brzina obrtanja puža ekstrudera (240, 360 i 590 o/min), kapacitet punjenja (16, 24 i 32 kg/h), vlaga polaznog materijala (7, 11,5 i 16 %) i ukupna površina otvora na matrici (19,8, 39,6 i 59,4 mm2). Zavisno promenljive karakteristike (odzivi) dobijenog hraniva koje su praćene bile su: sadržaj HCN u hranivu, sadržaj ALA, sadržaj slobodnih masnih kiselina (SMK) i potrošnja energije. Za modelovanje zavisnosti karakteristika hraniva od procesnih parametara ekstrudiranja primenjena je metoda odzivne površine (RSM), a korišćen je Box-Behnken-ov dizajn (BBD) za četiri faktora na tri nivoa. Za svaki od pomenutih odziva definisan je polinom drugog reda i određeni su koeficijenti polinoma, a analizom varijanse potvrđena je tačnost ovih modela. Formirani modeli upotrebljeni su za optimizaciju procesa ekstrudiranja, sa ciljem da se postigne što veća redukcija cijanogenih glikozida u hranivu, uz što viši sadržaj ALA i što niže SMK i potrošnju energije. Da bi se zadovoljili svi postavljeni uslovi optimizacije, proces ekstrudiranja bilo je potrebno izvoditi pod sledećim uslovima: brzina obrtanja puža – 417,41 o/min, kapacitet punjenja – 32 kg/h, vlaga materijala – 13,39 % i ukupna površina otvora na matrici – 19,80 mm2. Ovako dobijeno hranivo pokazalo je nizak sadržaj HCN, čiji je stepen redukcije u odnosu na početnu vrednost iznosio 76,20 %. Sa druge strane, sadržaj ALA smanjen je za svega 0,69 %, što ukazuje da ekstrudiranje nije negativno uticalo na masnokiselinski sastav proiz, The goal of the research in this thesis was to examine the effect of extrusion on functional feed compound, whose main role was to increase the content of omega-fatty acids in animal nutrition, especially α-linolenic acid (ALA). Flax seed, as the holder of the functional properties, and sunflower meal, as an adsorbent of linseed oil during extrusion, were used for the production of functional feed compound. Independent extrusion parameters studied in the experiment were: extruder screw speed (240, 360 and 590 rpm), loading capacity (16, 24 and 32 kg/h), the moisture content of the starting material (7, 11.5 and 16 % ) and the total die opening’s area (19.8, 39.6 and 59.4 mm2). Dependent variables (responses) of the produced feed compound were: HCN content in coextrudate, ALA content, the content of free fatty acids (FFA) and energy consumption. Response surface methodology (RSM) was applied in order to model mathematical dependence between co-extrudate characteristics and the independent process parameters. The experiments were designed according to Box-Behnken's design (BBD) with four factors, each at three levels. Second-order polynomial equation was developed for each of these responses, and polynomial coefficients were determined. Accuracy of each model was confirmed by analysis of variance (ANOVA). Formed polynomial models were used to optimize the extrusion process, with the aim of achieving high reduction of cyanogenic glycosides in feed compound, the highest content of ALA, as well as low FFA and low energy consumption. Obtained optimal conditions were: extruder srew speed - 417.41 rpm, loading capacity - 32 kg/h, moisture content of starting material - 13.39 % and the total die openings’ area - 19.80 mm2. Functional feed compound produced under these conditions showed a low concentration of HCN, and the degree of HCN reduction was 76.20 % compared to the starting HCN content. On the other hand, the ALA content was reduced by only 0.69 %, indicating that ext

Suncokretova sačma ima manju zastupljenost u peletiranim smešama za ishranu životinja od sojine sačme zbog većeg udela sirovih vlakana. Sirova vlakna depresivno deluju na svarljivost obroka i proizvodne rezultate, a mogu da imaju negativan uticaj na fizički kvalitet peleta. Pri peletiranju smeša za ishranu životinja u poslednje vreme značajna pažnja se posvećuje funkcionalnim promenama makronutrijenata, jer se smatra da ove promene pozitivno utiču na fizički kvalitet peleta. Razvojem modernih analitičkih tehnika, posebno termalne analize, moguće je opisati promene na skrobu u procesu peletiranja, nastale usled uticaja toplote i vlage. Sa druge strane, promene na proteinskoj komponenti u procesu peletiranja nisu dovoljno objašnjene. Najčešće se tumačenja svode na pretpostavke, bez objašnjenja o promenama u veličini molekula proteina, kao i njihovoj koncentraciji. Inovativan pristup ove doktorske disertacije je usmeren na opisivanje uticaja dodatka sojine i suncokretovih sačmi različitog sadržaja proteina u smeše na bazi kukuruza na tehnološke parametre procesa peletiranja, funkcionalne promene makronutrijenata (želatinizaciju skroba i denaturaciju i degradaciju proteina) i fizički kvalitet peleta. U okviru svake smeše takođe je ispitivan uticaj procesnih parametara, prečnika otvora sita mlina čekićara (2, 3 i 4 mm), vremena produženog kondicioniranja parom (bez produženog kondicioniranja, 5 i 10 minuta) na fizički kvalitet peleta. Istraživanja su pokazala da temperatura peletiranja, specifična potrošnja električne energije i udeo prašine u peletama zavise od sirovinskog sastava smeša, prečnika otvora sita mlina čekićara i vremena zadržavanja u kondicioneru, pri čemu temperatura peletiranja i specifična potrošnja električne energije rastu, a udeo prašine u peletama opada sa porastom koncentracije proteina u smešama. Dokazano je i da proces peletiranja utiče na funkcionalne promene makronutrijenata, želatinizaciju skroba i strukturne promene na proteinima. Takođe je do, Sunflower meal has a lesser presence in pelleted compound feed than soybean meal due to a higher proportion of raw fiber. Raw fiber has depressing effect on the digestibility and production results, and can have a negative impact on the physical quality of the pellets. Lately, considerable attention is paid to the functional changes of macronutrients in pelleting of animal feed. It is believed that these changes have a positive impact on the physical quality of the pellets. With the development of modern analytical techniques, especially the thermal analysis, it is possible to describe the changes of starch in pelleting process, caused by the impact of heat and moisture. On the other hand, changes of the protein components in the pelleting process are not sufficiently explained. The most common interpretation is reduced to the presumption, with no explanation of changes in the size of protein molecules, as well as in their concentration. The innovative approach of this dissertation is focused on describing the effect of the addition of soybean meal and sunflower meals, with different protein content, in mixtures based on corn, on the technological parameters of the pelleting process, functional changes of macronutrients (starch gelatinization, and protein denaturation and degradation), and physical quality of the pellets. Within each of the mixtures, the influence of process parameters, the diameter of the hammer mill sieve openings (2, 3 and 4 mm), duration of long term steam conditioning (without extended conditioning, 5 and 10 minutes) on the physical quality of the pellets was also investigated. Studies have shown that pelleting temperatures, the specific power consumption and the proportion of dust in pellets were dependent of composition of the mixtures, the diameter of the hammer mill sieve openings, and residence time in the conditioner. Pelleting temperature and specific power consumption increased, and the extent of fines in pellets decreased with increasi

Cilj ovog rada je ispitivanje uticaja procesnih parametara (transmembranski pritisak, protok i koncentracija suspenzije) na vrednost fluksa permeata, sa i bez prisustva statičkog mešača, tokom procesa mikrofiltracije suspenzija pšeničnog skroba na keramičkim membranama različitih veličina pora (200 nm i 500 nm). Mikrofiltracija je izvođena u uslovima recirkulacije i koncentrisanja napojne suspenzije. Za modelovanje zavisnosti procesa mikrofiltracije suspenzija skroba od procesnih parametara primenjen je postupak odzivne površine. Ispitivanjem mikrofiltracije suspenzija pšeničnog skroba na membranama sa različitim srednjim prečnikom pora (200 i 500 nm) uočeno je da sa povećanjem veličine pora vrednost fluksa permeata opada. U posmatranom eksperimentalnom opsegu procesnih parametara postignuto je relativno povećanje stacionarnog fluksa od 25% do 50% u uslovima recirkulacije napojne suspenzije, dok je u uslovima koncentrisanja napojne suspenzije relativno povećanje srednjeg fluksa iznosilo od 20% do 80%. Porast fluksa do kojeg dolazi postavljanjem statičkog mešača u kanal membrane uslovljen je uspostavljanjem turbulentnih uslova proticanja i karakterističnog kretanja fluida duž kanala membrane, koja je posledica karakterističnog povezivanja helikoidnih elemenata Kenics statičkog mešača. Kako u uslovima recirkulacije napojne smeše, tako i u uslovima koncentrisanja, vrednost relativne specifične potrošnje energije zavisi skoro isključivo od vrednosti protoka napojne smeše. Sa povećanjem protoka specifična potrošnja energije u prisustvu statičkog mešača naglo raste i relativno povećanje protoka nije dovoljno da bi kompenzovalo gubitak hidrauličke snage. U opsegu protoka od 80 do 100 L/h su obezbeđene pozitivne vrednosti relativne promene specifične potrošnje energije, te je upotreba statičkog mešača opravdana sa ekonomskog aspekta. Optimizacija eksperimentalnih uslova urađena je postupkom istovremene maksimizacije fluksa permeata u sistemima sa statičkim mešačem i relativ, The aim of this study was to investigate the effect of process parameters (transmembrane pressure, flow rate and suspension concentration) on the permeate flux in the system with and without the presence of static mixer. Microfiltration of wheat starch suspensions was performed in recirculation and concentration mode using ceramic membranes with different pore size (200 nm and 500 nm). Response surface methodology was applied for modeling cross-flow microfiltration of starch suspensions. During investigation of starch suspension microfiltration process on membranes with different pore size diameter (200 and 500 nm) it was observed that with increasing pore size the permeate flux declined. In the experimental range of process parameters, flux increase had values between 25% and 50% in recirculation mode, while in concentration mode this improvement was in range between 20% and 80%. The increase in flux that occurs by placing a static mixer in the membrane channel was caused by the establishment of turbulent flow conditions and the characteristic flow of fluid along the membrane channel, which is a consequence of the characteristic geometry of Kenics static mixer. Both in recirculation and concentration mode, the reduction of specific energy consumption depends almost exclusively on the value of the suspension flow rate. Specific energy consumption increased rapidly with increasing flow rate in the presence of static mixers and flux improvement is not high enough to compensate the loss of hydraulic dissipated power. The flow rate in the range from 80 to 100 L/h provided positive values of the reduction of specific energy consumption and the use of static mixers was justified from the economical point of view. Optimization of experimental conditions was done by a procedure of simultaneous maximization of permeate flux in systems with static mixers and reduction of specific energy consumption. Optimal conditions of the wheat starch suspension microfiltration in recircul