Final Solids Content Research Articles

Optimization of Formulation for Development of Amaranth Incorporated Composite Fermented Milk Drink using Response Surface Methodology

Background: Fermented milk products are highly nutritious food containing a significant amount of macro-nutrients, micro-nutrients as well as bioactive molecules which are required for the growth and overall development of all age’s people. However, they lack in fibre, vitamin C and essential mineral such as iron. Pseudo-cereal like amaranth is a principal source of energy consists of significant amount of carbohydrates, protein, fibre and some micronutrients viz., calcium, phosphorus, iron, zinc etc. Therefore, a study was undertaken to optimize the amaranth (Amaranthus cruentus) incorporated composite fermented milk drink (AICFMD). Methods: In present study, the central composite rotatory design (CCRD) with response surface methodology (RSM) was used to optimize the level of various ingredients (Independent variables) i.e. roasted amaranth flour, sugar and curd acidity to formulate the most acceptable AICFMD. Result: The results revealed that composite fermented milk drink prepared from toned milk 60.5%, amaranth 4%, sugar 10.5%, water 25.0% (w/w) with curd acidity 0.831% lactic acid and final total solid content maintained to 21.2%, resulted in good quality AICFMD.

Processing of Aqueous Graphite–Silicon Oxide Slurries and Its Impact on Rheology, Coating Behavior, Microstructure, and Cell Performance

The mixing process is the basis of the electrode microstructure, which defines key cell performance indicators. This work investigated the effects of varying the energy input within the mixing procedure on slurry rheology, coating behavior, mechanical and electrical properties of dry electrodes and electrochemical performance of cells fabricated from these negative electrodes. Energy input differences were achieved by varying the solids content within the mixing procedure; however, the final total solids content of the slurries was always the same. The slurries, produced with graphite and silicon oxide as active materials and carboxymethylcellulose (CMC) and styrene-butadiene rubber as binders, showed large differences in flow behavior which were explained by changes in CMC adsorption and mechanical degradation because of increasing energy input. Low shear viscosity and the degree of shear thinning decreased with increasing energy input, resulting in a narrower stability window for slot-die coating. The resistance between the electrode and current collector decreased as more CMC was adsorbed on the active material. Electrode adhesion drastically dropped at the highest energy input, presumably due to a change in SBR distribution. Despite these variations, all fabricated pouch cells demonstrated excellent electrochemical performance and a slight trend of increased charge capability was observed in cells prepared with higher energy input.

Technical assessment of nanofiltration process for concentration of cranberry juice and recovery of benzoic acid

SummaryThis work investigated cranberry juice nanofiltration using a plate and frame pilot plant equipped with NF99 membrane to concentrate cranberry juice and simultaneously separate benzoic acid from cranberry juice. The influences of ultrafiltration pretreatment were also considered. The results indicated that UF pretreatment can improve permeate flux and consequently the concentration factor and concentration degree. In both cases, the dominant fouling mechanism of cranberry juice nanofiltration was complete blocking. However, the UF pretreatment could reduce the fouling phenomena. With nanofiltration of ultrafiltration pretreated cranberry juice at pH 2.5 and 4 MPa of operating pressure; concentration factor, concentration degree, final solid content, the total rejection of benzoic acid and recovery yield of soluble solid were 4.23, 4.14, 21.3 oBrix, 0.703 and 0.938 respectively. In the permeate, the benzoic acid content on dry matter increased more than 10 times compared with the feed. These results indicate that it is promising to apply nanofiltration for not only recovering benzoic acid from cranberry juice but also concentrating that juice simultaneously with benzoic acid recovery.

Improving the production technique of meat chopped semi-finished products with the addition of dried semi-finished product with a high degree of readiness

The object of this study is a production technique of meat chopped semi-finished products with the addition of dried semi-finished product based on Jerusalem artichoke and zucchini. The production technique of meat chopped semi-finished products with the addition of dried semi-finished products of a high degree of readiness (Jerusalem artichoke and zucchini) has been improved. The dried semi-finished product is manufactured by a low-temperature drying technique in an IR field at a temperature of 45...60 °C to the final solids content of 12...15 %. The adsorption properties of the dried semi-finished product of a high degree of readiness were determined and it was established that its swelling takes place due to the absorption of the water-fat emulsion while there is an actual increase in the volume of the semi-finished product by 2.3...2.6 times. A feature of the production technique of meat chopped semi-finished products with the addition of a high-readiness dried semi-finished product to the recipe is frying in an apparatus with functionally closed media. The duration of frying in the proposed apparatus with functionally closed media compared to the conventional technique is reduced by 2.4 times. Introduction to the recipe of meat chopped semi-finished products of dried semi-finished products based on Jerusalem artichoke and zucchini reduces total weight loss by 11.9 % of meat culinary products without shrinkage. The data on the chemical composition of meat chopped semi-finished products with the addition of dried semi-finished products in comparison with the control confirm the increase in the nutritional value of the prototype while the energy value is reduced by 19 %. The implementation of the improved technique will make it possible to obtain a competitive range of meat chopped products with natural ingredients that increase the nutritional value of products and eliminate the use of artificial ingredients.

New Partially Water-Soluble Feedstocks for Additive Manufacturing of Ti6Al4V Parts by Material Extrusion.

In this work, a process chain for the realization of dense Ti6Al4V parts via different material extrusion methods will be introduced applying eco-friendly partially water-soluble binder systems. In continuation of earlier research, polyethylene glycol (PEG) as a low molecular weight binder component was combined either with poly(vinylbutyral) (PVB) or with poly(methylmethacrylat) (PMMA) as a high molecular weight polymer and investigated with respect to their usability in FFF and FFD. The additional investigation of different surfactants' impact on the rheological behaviour applying shear and oscillation rheology allowed for a final solid Ti6Al4V content of 60 vol%, which is sufficient to achieve after printing, debinding and thermal densification parts with densities better than 99% of the theoretical value. The requirements for usage in medical applications according to ASTM F2885-17 can be fulfilled depending on the processing conditions.

Steady-state modeling of a new continuous API dryer: Reduced-order model and investigation of dryer performance

In the present study, a reduced-order model is proposed to analyze a novel continuous dryer with an application in the pharmaceutical industry. The model was validated using process data from ibuprofen drying test runs, and the results were in good agreement with the experimental data. The test substance was an ibuprofen paste with an initial LOD of up to 30 w%. The simulations showed that the contact heat transfer coefficient can be correlated with the degree of wetness. Furthermore, a set of simulations was performed to analyze the influence of input parameters on the dryer’s performance: i) the inlet air flow rate and ii) the inlet air temperature. The simulation results demonstrated that a variation in the inlet air temperature significantly affects the air temperature profile, while the inlet air flow rate has a minor effect. Besides, it was also established that the inlet solid LoD has the most considerable effect on the product quality (e.g., final solid moisture content). The results showed a deviation of less than 10% for the product LoD and the product temperature in most cases.

Sheet sealing in single and multilayer nanopapers

This study addresses one of the limiting factors for producing micro and nanofibrillated cellulose (MNFC)-containing papers: poor water removal properties. We focus on the sheet sealing phenomenon during dewatering. A modified dynamic drainage analyzer (DDA) is used to examine both multilayer and single layer forming of MNFC and pulp mixtures. It was found that a thin layer of pulp fibers on the exit layer with the grammage as low as 5 gsm was enough to significantly improve the dewatering of MNFC. For example, the dewatering rate of a furnish with 50% MNFC increased from 0.6 mL/s for a mixed system to 2 mL/s for multilayer system. However, the sheet sealing behavior was completely different when a lower proportion of MNFC was used. For the furnishes with less than 20% MNFC content, the mixed furnishes dewatered faster because the high amount of pulp fibers were able to prevent MNFC from enriching on the exit layer. Surprisingly, we found that very high final solids content (couch solids) could sometimes be achieved when MNFC was used. The highest solids contents achieved were 34 and 29% for the mixed systems. This compares to the 15–20% range typical of standard papermaking furnishes without MNFC. Overall, the results show that contrary to current thinking MNFC containing papers may lead, under some circumstances, to enhanced wire section dewatering.

(Digital Presentation) Electrochemical Dewatering of Cellulosic Nanomaterials

Cellulose is an abundantly available natural resource utilized for cost effective manufacturing of cellulosic nanomaterials that exhibit great potential in a variety of industrial applications. Although cellulosic nanomaterial is cost effective to produce, it is not economical to ship long distance while containing significant water content (>95 wt.%). Therefore, a need has been identified by manufacturers to develop energy-efficient, dewatering or drying of cellulosic nanomaterials.Accordingly, Faraday Technology in collaboration with GranBio USA, manufacturers of cellulosic nanomaterials, is addressing this need by developing an economical method and system, for electrochemical dewatering of cellulosic nanomaterials including cellulose nanocrystals (CNCs) and cellulose nanofibrils (CNFs). Innovative reactor designs are utilized to demonstrate the feasibility of an industrially viable and energy efficient ElectroDewatering approach capable of generating >50 wt.% final solid content for both CNC and CNF. The material properties were maintained through dewatering, and materials with ~25-30 wt.% final solids were successfully rehydrated and redispersed via vortexing. The pulse process approach reduced the energy use by at least 50% compared to thermal drying at similar dewatering performance. We have continued to improve our TRL by scaling the electrochemical dewatering system from sub-scale batch to alpha-scale continuous process. Specifically, this talk will discuss the results of these advancements. Acknowledgements: The financial support of DOE Contract No. DE-SC0018787 is acknowledged.

Application of polyelectrolytes for improving the dewatering performance of drinking water treatment sludge using geotextiles

The sludge generated at drinking water treatment plants (WTPs) is a high-moisture content residue, and therefore difficult to handle, transport, dispose of or recover. During the last decades, geotextile tubes have been successfully applied to reduce the residue volume, facilitate its handling and subsequent reuse. This study aimed to understand the factors that interfere in the filtration and dewatering efficiencies and to experimentally analyze the dewatering process of WTPs sludge, evaluating different test procedures and investigating the influence of the type and dosage of polymeric additives on dewatering performance. Geotextile cone dewatering tests and geotextile bag dewatering tests were performed, using four different woven geotextile samples and an aluminum sulfate WTP sludge sample. The results showed that the use of geotextile cone dewatering tests for geotextile selection and for additive selection and dosage was representative for the dewatering process intended, reflecting the results verified in the geotextile bag dewatering tests. Sludge chemical conditioning increased dewatering rate and solids retention during the tests’ early stages, but it did not result in a higher final solids content sludge cake.
 Keywords: dewatering systems, geosynthetics, waste management.

Enhancement of sludge electro-dewatering by anthracite powder modification

Electro-dewatering of sludge has received considerable attention due to its low energy consumption for sludge deep-dewatering. However, prior studies have shown the resistance of dried sludge near anode significantly hinders electro-dewatering. The dewatering performance may be improved by reducing the resistance with the addition of conductive material into sludge. We conditioned municipal sludge by anthracite powder, an inexpensive product, to increase solid conductivity, followed by electro-dewatering. After running for 20 min under a constant voltage of 30 V, when the anthracite powder mass was 10%–22% of raw sludge dry solids mass (DS), the final dry solids content of the mud cake after dehydration was 6.2%–12.9% higher than that from dehydration of unconditioned sludge. The average filtrate flow rate ranged from 0.0243 to 0.0285 g s−1. The lowest unit energy consumption, 0.19 kW h·kgwater−1, which was 14% lower than that of control, was reached when 18% DS of anthracite was added. Our theoretical analysis indicates that properly increasing solid conductivity of sludge can reduce the adverse effect caused by the high electrical resistance of sludge near anode. The experimental results, along with the theoretical analysis, show that using anthracite powder for sludge modification is an economical approach to improve sludge dewatering rate and reduce energy consumption.

Fast dewatering of high nanocellulose content papers with in-situ generated cationic micro-nano bubbles

Herein, an innovative method to improve the dewatering of micro- and nanofibrillated cellulose (MNFC) containing furnishes is proposed. This method is based on fiber flotation in which cationic bubbles are injected into the furnish to separate fibers from liquid medium and accumulate them on the surface of the furnish. These cationic bubbles are generated by pressurizing a solution of Hexadecyltrimethylammonium chloride in deionized water in a dissolved air flotation (DAF) tank. The drainage properties of the furnishes with MNFC content from 0% to 25% were studied. With the help of the cationic bubbles, drainage rate of 0% and 15% MNFC furnish increased from 183 ml/s to 210 ml/s and 38 ml/s to 113 ml/s, respectively. The final couch solids content of these furnishes also increased from 16 wt% to 23 wt% and from 21 wt% to 24 wt%, respectively. Cationic bubbles flocculate MNFC fibers and increase retention. Sheets characteristics including morphology, permeability, mass distribution and surface profilometry were investigated. Cationic bubbles help structure fiber elements and improve the sheet formation.

Synergy between Dual Polymers and Sand-to-Fines Ratio for Enhanced Flocculation of Oil Sand Mature Fine Tailings

The current challenges in dewatering oil sand mature fine tailings (MFTs) by flocculation using a single flocculant include the requirement of very high doses and high cost, inefficient flocculation, and low content of solids in sediment. The obtained flocculated sediment with less than <40 wt % solids is difficult in further consolidation and dewatering for the final disposal. In this work, we examined a new approach for dewatering by dual polymer flocculation in combination with varying sand-to-fines ratios (SFRs) in MFTs. The dual polymers were an anionic polyacrylamide (APAM), and a nanosized cationic hybrid polymer (NHP). Our results confirmed that using single polymers alone was unable to achieve satisfactory flocculation. The solids content in the sediment was <30%, even with increasing flocculant dosages up to 2000 ppm for APAM, and 5000–8000 ppm for NHP, respectively. Although better flocculation was obtained by dual polymers, with reduced total flocculant dosages, the improvement was also limited, in terms of the final sediment solids content (<44%). However, much improved flocculation performance was obtained by increasing the SFR value of the MFT (from 0.1 to 1.5), with significantly reduced total polymer dosages at only 650 ppm. Using different combinations of SFR values and dual polymer dosages, the sediment solids could reach 56 wt % after 24 h of natural settling. It was found that the dual polymer system was less sensitive to the changes in polymer dosages, and that no “overdosing” phenomenon was observed for the tested dual polymers. To rationalize the synergy from dual polymers and SFR, we propose that loose and extended flocs formed by the large anionic polymer and suspended fines were consolidated by the small and cationic polymer through strong electrostatic attraction with fines and the large anionic polymer. Coarse sands were “cores” to carry and condense the loosely structured flocs of fine solids, and they exclude the entrapped water inside the flocs. Our work demonstrates that combining dual polymers and suitable SFRs may be an effective strategy to produce sediment with high solids contents, reduce the required flocculant dose, eliminate overdosing issues, and achieve fast settling rates.

Sugar cane juice concentration via CO2 gas hydrate formation

AbstractSugar cane juice concentration via evaporation is the traditional method, though the downside in this technique is the product loss due to sucrose inversion. Gas hydrate separation is an emerging technology applied in desalination, carbon capture, and in this study, for concentrating fruit juice by trapping the water in the form of crystalline cages. A 750 cm3 hydrate reactor was used for hydrate formation experiments to concentrate the sugar cane juice, with a sampling of the concentrate to determine the final solids content. Hydrate formation experiments showed the successful concentration of a 0.12 mass fraction feed to approximately 0.56 mass fraction using four batchwise concentration stages. A comparison of the energy usage between the evaporation train as used in sugar factories and a single batch hydrate formation stage, to concentrate a 0.12 mass fraction feed to 0.30 mass fraction showed an energy reduction of approximately 20% for the hydrate method.

Dewaterability and energy consumption model construction by comparison of electro-dewatering for industry sludges and river sediments

Electro-dewatering (EDW) is an emerging technology for improved sludge/sediment dewatering enabling subsequent cost effective treatment for toxicity and pathogenic reduction if required and/or disposal, but the effects of sediment/sludge properties on the efficacy of EDW remain unclear. Here we investigate EDW in the absence of chemical conditioning which can result in secondary pollution. The influence of sediment/sludge volatile solids content (VS), electrical conductivity (EC), pH and zeta potential (ζ), on mechanical and electrical behaviors determining dewaterability and energy consumption (PE) was investigated. Optimization of EDW parameters increased the final solids content (DSf) from 40 wt% to more than 55 wt% for river sediment, while the solids content in municipal sludge was only increased from 10 wt% to 15–20 wt%. Multiple linear regression and statistical analysis showed that electro-dewatering performance is primarily affected by VS and PE is mainly affected by EC. A theoretical basis for engineering design and selection of operational parameters for sludge/sediment electro-dewatering is provided by this study.

Drying characteristics of faecal sludge from different on-site sanitation facilities

Drying is one of the treatment techniques used for the dual purpose of safe disposal and energy recovery of faecal sludge (FS). Limited data are available regarding the FS drying process. In this paper the drying properties of FS were investigated using samples from ventilated improved pit (VIP) latrines and urine diversion dry toilets (UDDT) and an anaerobic baffle reactor (ABR) from a decentralized wastewater treatment systems. Moisture content, total solids content, volatile solids content, water activity, coupled thermogravimetry & differential thermal analysis (TGA-DTA) and calorific value tests were used to characterize FS drying. Drying kinetics and water activity measured at different moisture content during drying (100 °C) were similar for the samples from different on-site sanitation facilities. Experimental heat of drying results revealed that FS requires two to three times that of the latent heat of vaporization of water for drying. Drying temperature was more significant than the sludge source in determining the final volatile solids content of the dried samples. This was reinforced by the dynamic TGA that showed considerable thermal degradation (2–11% dry solid mass) near 200 °C. Below 200 C, the calorific value of the dried samples exhibited no significant difference. The average calorific values of VIP, UDDT and ABR samples at 100 °C were 14.78, 15.70, 17.26 MJ/kg dry solid, respectively. This suggests that the fuel value of FS from the aforementioned sanitation facilities will not be significantly affected by drying temperature below 200 °C. Based on this study, the most suitable temperature for drying of FS for a solid fuel application was found to be 150 °C.

Mathematical Model and Optimization of Continuous Electro-Osmotic Dewatering

A dilute 2-3 wt.% suspension of phosphatic clay is produced as a waste stream in the beneficiation of phosphate ore. A typical Florida phosphate mining operation produces more than 6,300 L/s of phosphatic clay. The clay-water suspension is pumped into large impoundments called clay settling areas in which separation is achieved by hindered settling and self-consolidation. As it settles, the supernatant water is recycled for use in the beneficiation plant. A top crust is formed after a few years, but the clay beneath the crust has a large water content and a pseudo-plastic character that limits the amount of weight the settling area can support. Uses for the land are limited by the properties of the clay that leave the settling areas unstable, even after 50 years of elapsed time.1 The objective of the present work was to develop a mathematical model based on soil mechanics, electrokinetic phenomena, and transport phenomena that describes a fully continuous electrokinetic dewatering apparatus for processing a dilute phosphatic clay to a dewatered plastic cake. The physical system studied is based on a prototype developed by Dizon and Orazem.2 A constrained optimization strategy was developed that yielded the process parameters of a cost-optimized continuous electrokinetic dewatering process and was used to simulate an industrial-scale operation.3 The model developed in this work adequately represented experimental data collected for the operation of the lab-scale continuous electrokinetic dewatering prototype. The optimization strategy consisted of a constrained maximum electric field and final solids content of 35 wt% for a continuous electrokinetic dewatering process starting with a feed clay with a solids content of 10 w%. Optimal operating parameters were identified for an industrial-scale continuous electrokinetic dewatering process capable of processing the effluent production rate of the Mosaic Co. Four Corners Mine. The simulation results suggest that lower total costs may be achieved with small electrode gaps. The cost-optimized process parameters were a feed-side gap of 8.5 cm, a residence time of 1.3 hours, and a dry-clay production rate of 7.58 kg/h m2. An estimated total electrode area of 0.17 km2 was required. The total cost of an optimized industrial-scale continuous electrokinetic dewatering process was estimated to be $9.12 per metric ton of dry clay. References Kong, A. Dizon, S. Moghaddam, and M. E. Orazem, “Development of Fully-Continuous Electrokinetic Dewatering of Phosphatic Clay Suspensions,” in Electrochemical Engineering: From Discovery to Product, Volume XVIII of Advances in Electrochemical Science and Engineering, R. Alkire, P. N. Bartlett, and M. Koper, editors, John Wiley & Sons, Hoboken, 2018, 159-192.Dizon and M. E. Orazem, “Efficient Continuous Electrokinetic Dewatering of Phosphatic Clay Suspensions,” Electrochimica Acta, 298 (2018), 134-141.Dizon and M. E. Orazem, “Mathematical Model and Optimization of Continuous Electro-Osmotic Dewatering,” Electrochimica Acta, 304 (2019) 42-53.

Dynamic optimization and experimental validation of a pilot scale emulsion polymerization reactor

Dynamic optimization of the emulsion polymerization of vinyl acetate in a pilot scale stirred-tank reactor was studied. The objective function was defined in order to minimize the reaction time. The polymerization reactor was modeled concluding that the effect of the heat removal is decisive to regulate the quality characteristics of the product. The optimization was performed offline using an optimal control dynamic optimization method, selecting as manipulated variables the heat exchange fluid rate and the feeding flow rates of initiator and monomer. The objective function was subjected to several constraints: the heating time until the system reached the activation temperature, final solids content, final product viscosity and final monomer conversion. As a result, it was determined that the polymer could be produced with a maximum time reduction of 29%. The reduction of time affected the polymer final viscosity dropping it, due to an increase in the number of free radicals which intensified the termination reaction rate. Finally, an experimental validation at pilot scale reactor was made showing good results in terms of the polymer end-properties, in accordance to those obtained via dynamic optimization.

Electro-dewatering of sewage sludge: Influence of combined action of constant current and constant voltage on performance and energy consumption

In this study, mechanically-dewatered sludge was used to investigate the effect of electro-dewatering (EDW) under two electrical modes, which are constant current mode followed by constant voltage mode (CV-EDW), and constant voltage mode followed by constant current mode (VC-EDW). The effect of current and voltage changes on dewatering efficiency and energy consumption of sludge electroosmosis under CV-EDW and VC-EDWs was evaluated The results show that compared with constant current mode (C-EDW), CV-EDW can improve the final dry solids content and reduce the heating rate, and the final dry solids content and unit energy consumption increase with the decrease of current and the increase of voltage. Under CV-EDW, when the dry solids content is 32%, the energy consumption can be reduced by changing to the constant voltage stage, and the energy consumption is 0.093–0.113 kWh/kgwater. Compared with constant voltage mode (V-EDW), VC-EDW significantly improves sludge dewatering rate. Under VC-EDW, the final dry solids content of sludge increases with the decrease of current and voltage. When the voltage is decreased by 10 V, the unit energy consumption is reduced by 27.15 ± 1.77% on average, and the energy consumption is 0.132–0.163 kWh/kgwater. Compared with CV-EDW, the dehydration rate of VC-EDW is increased by 72.9% on average. However, the unit energy consumption required for dehydration increases by 43.09% when the dry solids content is less than 45%.

Environmental and economic assessment of electro-dewatering application to sewage sludge: A case study of an Italian wastewater treatment plant

The objective of this study is to evaluate the feasibility of implementing electro-dewatering (EDW) as an add-on unit to the existing conventional dewatering units with the aim of increasing the final dry solids content and reducing the subsequent handling and energy costs of sewage sludge management. The assessment was carried out by focusing on a case study, a small wastewater treatment plant (WWTP) in the Milan metropolitan area. Various indicators were used to evaluate the environmental impact and economic performance. Primary data, such as operating data from the case study WWTP and economic data from an EDW equipment manufacturer, were extracted and used in the modelling. Four scenarios were set up and compared, which address the current and future sludge management schemes in Italy.The results suggest that it is environmentally and economically feasible to implement the EDW upgrade if the sludge disposal follows the incineration route. More specifically, when small WWTPs deliver their EDW-dewatered sludge to a centralised incineration facility, this will enable to reduce the global warming impact of the system up to 135 kg CO2-eq. per dry tonne of sludge. In addition, good profitability (incremental return on investment > 15.1%) can be obtained when the market disposal cost is above 30.5–39.6 € per wet tonne of sludge. Based on our recent market survey, the sludge disposal price is well above the break-even values.

Ontology based systemazing of the science information devoted to waste utilizing by methanogenesys

Quantity of the scientific materials in the field of biogas production is growing. Thus, it is actual to provide informational management of it. Previously text documents and not-interactive pictures were used to describe it. The approach to systematization of scientific information on the production of biogas based on the ontological IT platform of TODOS is developed. It is proposed to separate the semantic characteristics of each work for their further introduction it into the IT platform of the TODOS. To construct a system of ranking of previous studies, we have identified the semantic characteristics of scientific research devoted to the production of biogas from chicken manure. Temperature (°C), volume of reactor (l), chicken manure content (%), moisture content (%), active sludge content (%), final solids content (%), biogas production and methane (ml/g TS), methane content (%), year of the research, ammonium nitrogen content (mg/l), VFA (mg/l), pH is final, initial pH, minimum pH, maximum pH were used to create ontology management system of the previous researches devoted to biogas production. The characteristics of the microorganisms were used to create the ontology based system of the microorganism selection. Google sheets was used to create base of knowledge and previous researches. An ontological graph with a ranking function for previous scientific research and a system of selection of microorganisms has been developed. Thus, the proposed systems allow to systematize previous research and theoretical information devoted to help of ontological graphs and provide information management in this field. Developed approaches allow us to analyze the results of previous research and theoretical information which provides systemizing of information and information management in general.