Hynek Roubík

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Verified

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• Professor (Assoc.)
• Dean at Czech University of Life Sciences Prague

This study evaluates the suitability of digestate from small mesophilic biogas plants in central Vietnam for agricultural application. Digestate samples were collected from 85 farms and analyzed for microbial contamination and elemental composition. The presence of pathogens was examined after anaerobic digestion under mesophilic conditions and the...

Anaerobic digestion is an important renewable energy technology that has the potential to reduce greenhouse gas emissions and contribute to the development of a sustainable energy system. However, research on anaerobic digestion is extensive and fragmented, making it difficult to gain a comprehensive understanding of the technology. Therefore, a la...

The West Nusa Tenggara (WNT) province is one of the regions that contribute the most to the production of rice, corn, and cacao. The residues of these crops increase as production increases. The potential availability of the residue was calculated on the basis of the amount of agricultural product and the availability of unutilized residues. The es...

Background Pandemics as health and humanitarian crises have exerted traceable impacts on food security. Almost all past and current pandemics have created a food crisis that affects a share of the global population and threaten global food security. With the more frequent outbreaks of emerging and re-emerging diseases or pandemics, this paper looks...

This study involved a systematic analysis of greenhouse gas (GHG) emissions from household biogas plants in Vietnam to determine the emission reduction potential of a typical household biogas plant with a volume of 6 m³ and an assumed life cycle of 20 years. The CO2 emissions pertaining to different phases of the life cycle of household biogas plan...

The most important area of environmental safety is microbiological safety. In this direction, it is important to develop special engineering and technical support for biotechnological industries and the possibility of disposing of their waste. Wastes of biotechnological productions belong, as a rule, to the type decomposing in natural conditions un...

Biotechnology products are very variable, and their diversity only increases with science and technological innovation development. This section deals with environmental biotechnology products, meaning biotechnologies for waste treatment and purification of environmental components. Since they aim to reduce the negative anthropogenic impact on the...

The biological agent is an active beginning in biotechnological processes and one of its most important elements. The range of biological agents is constantly expanding. The main ones include microorganisms, microbial associations, enzymes, fungi, and plants. Until now, the most important place is occupied by a traditional object—a microbial cell....

Engineering realization of processes of disinfection and treatment of wastewater and its sludge, as well as waste treatment in biotechnological processes, has considerable variability. Therefore, in this section, the basic technical methods and schemes of realization of such processes and an introduction to such biotreatment are given. Examples of...

The development of biotechnology is important for the establishment of sustainable development goals. An important direction of implementation of bioprocesses in environmental protection is realized in environmental biotechnologies. In particular, they relate to the introduction of technologies of waste bioprocessing, restoration of fertility of po...

The phosphogypsum is a by-product of phosphoric acid production for phosphate fertilizer. The problem of its accumulation in the environment is becoming increasingly important due to large-scale fertilizer production. This Chapter evaluates the potential of phosphogypsum as a mineral additive for the microorganism’s growth under biotechnological pr...

The processes of wastewater and sludge treatment and waste detoxification in biotechnology can be divided into aerobic and anaerobic. Each subtype of biotechnology has its peculiarities in achieving environmental safety indicators. In this chapter, the biochemical basis of fermentation processes in oxygen and oxygen-free modes, as well as the neces...

In general, the substrates of biotechnology can be very different depending on the sphere of production and application. However, a particular area of biotechnology implementation in environmental protection is the introduction of waste recycling. Therefore, this chapter deals with the possibilities of waste recycling in biotechnology, focusing on...

Waste from livestock farms contains various pathogens, including eggs and larvae of helminths—pathogens of parasitic diseases harmful to animals and humans. One of the methods for their effective processing to obtain biofertilizer and biofuel is anaerobic digestion, which requires further improvement to completely suppress the viability of pathogen...

This study presents a novel treatment of biogas digestate to produce biochar at processing temperatures of 500–700 °C. The resulting biochar was applied for the simultaneous removal of methylene blue (MB) and malachite green (MG) in a binary system. Characterization included metal element analysis, nitrogen adsorption/desorption isotherms, energy‐d...

Facing climate change, soil degradation and sabotage of one third of the country’s freshwater resources (due to the war and destruction of the Kakhovka reservoir), the prospects of fertigation on black soils in the south of Ukraine using sprinkler irrigators were examined. By compiling daily soil hydrographs, it is possible to track changing water...

BACKGROUND The study of invasive plant species distribution involves changes in their ranges and ecological niches under the projected global temperature increase until 2100. However, climate modeling of habitat suitability for Reynoutria japonica in Europe remains limited, hindering risk assessment and effective management of its spread. We used t...

Southern Ukraine is home to Europe's biggest cluster of irrigated lands. Considering the current situation and prospective stresses from climate change in coming decades, we assess the structure and management of Ukraine's irrigation sector, the initial steps and elements of a new strategy to restore the Kakhovka Reservoir on the Dnipro River, and...

The diffusion of biogas technology remains extremely slow in Cameroon despite global mobilisation to transition to cleaner energy sources. Without adequate evidence to inform the formulation of new policies and strategies to revamp the biogas sector, this study applies a technological innovations systems (TIS) approach to investigate the causes of...

The problem of chemical soil pollution after military actions on the territory of Ukraine is becoming quite urgent in terms of ecological risks. The aim of the article was to establish the level of ecological safety of soils after the application of biosorption technology and to substantiate its ecological and economic feasibility. Within the scope...

Purpose Life cycle assessment (LCA) provides a comprehensive methodology to evaluate the environmental impacts of products, processes, and services based on the net flow of energy, materials, and emissions throughout their life cycle. This review focuses on the state of LCA in water and wastewater treatment in Africa, aiming to ascertain the extent...

Environmental negotiations are complex, and conveying the interaction between science and policy in traditional teaching methods is challenging. To address this issue, innovative educational approaches like serious gaming and role-playing games have emerged. These methods allow students to actively explore the roles of different stakeholders in env...

Public engagement with reproducibility is crucial for fostering trust in science. This Community Page outlines, through the example of baking Christmas tree meringues, how scientists can effectively engage and educate the public about the importance of reproducibility in research.

The study aimed to assess the state of production of pulses and their use in the Ukrainian market. To achieve this goal, the production, yields, sown areas, export dynamics, and structure of the use of pulses such as beans, soybeans, and peas in 2015-2023 were analysed. The study determined that the production of exports and consumption of pulses i...

Aquaculture presents a promising opportunity for sustainable food production in the sandy regions of Zambia's Western Province. This study, part of the Integrated Farming III project, investigates the potential of three different types of ponds for tilapia farming: natural earthen ponds with mixed-sex tilapia, dam liner ponds with mixed-sex tilapia...

A Biofilter is a simple technology used in an anaerobic baffled reactor (ABR) to keep biological solids (inoculum) from being easily carried by the inlet substrate and to shorten the hydraulic retention time (HRT). The principle of a biofilter is to form a biofilm on the packed bed of the biofilter in ABR so that it contains immobilised microorgani...

The examination of primary risk assessment methodologies reveals a significant expansion in recent years, particularly toward encompassing ecosystem preservation and predictive models for environmental contaminant behavior. However, alongside this progress, new challenges have surfaced, such as engineered nanoparticles, cumulative impacts, and the...

The establishment of a system for food insecurity mitigation in times of crisis is one of the main tools for stabilisation of a population. The policymakers need such tools in order for the state to survive in a scenario of a major crisis, which thanks to both the international situation and climate change seem likely. Therefore, this study (case o...

Introduction: Food security is a critical component of a nation's well-being, directly impacting the health, social stability, and economic development of its population. This policy paper focuses on Ukraine, exploring current challenges, strengths, and potential policy recommendations to enhance food security in the country. Current State of Food...

The implementation of resource-efficient technology in contemporary agricultural production enhances the productivity and efficiency of sunflower farming while mitigating environmental harm. The research aimed to examine the impact of various tillage techniques on sunflower farming in southern Ukraine. A field study was undertaken from 2021 to 2023...

The biofilter used is a simple technology in anaerobic digestion to remove pollutants from the substrate to enhance biogas production and nutrient effluent, which can be used as liquid organic fertiliser. This study aims to determine the effect of using a biofilter to improve biogas production and biogas effluent as an organic fertiliser material....

Global and regional competition for natural resources, particularly for land and water, food and fodder, takes place in the context of a dire necessity to limit greenhouse gas emissions and is becoming more and more pressing every year. Environmental soundness, sustainability and security are becoming more relevant and are considered as key element...

This research explores the potential for generating biogas and clean energy by processing organic waste, a process that can become a sustainable solution to Syria's energy needs. Focusing on agricultural residues generated from citrus fruit orange, date, and jujube cultivation in Syria, this study evaluates the potential for anaerobic digestion of...

Yeasts are the usual contaminants in fruit juices and other beverages, responsible for the decrease in the quality and shelf-life of such products. Preservatives are principally added to these beverages to enhance their shelf-life. With the increasing consumer concern towards chemical food additives, plant-derived antimicrobials have attracted the...

Anaerobic digestion with simultaneous production of biogas is one of the most common methods of recycling, processing and decontamination of organic waste to produce alternative fuels. A commonly used indicator of the sanitary safety of the substrate is eggs of Ascaris suum nematodes of pigs, which are characterised by extremely high resistance to...

The tofu industry consumes a lot of energy and water for its process production and then produces wastewater in large quantities that have a negative effect on the environment. It is because tofu craftsmen still use conventional technology in the process production, and there is no SOP for the use of raw materials and energy sources, and there is a...

This study provides an in-depth economic analysis to aid decision-making in the adoption of small-scale biogas technology in rural areas of Cameroon. It also provides evidence of the field investment characteristics of the biogas energy supply in rural areas of Cameroon. The methodology focused on assessing the economic viability of different sizes...

The migration of heavy metals and radionuclides is interrelated, and this study focusses on the interaction and complex influence of various toxicants. The rehabilitation of radioactively contaminated territories has a complex character and is based on scientifically supported measures to restore industrial, economic, and sociopsychological relatio...

Russian forces have destroyed one-third of Ukraine’s freshwater storage since February 2022 to 2024. Potable, industrial and irrigation water supplies have been cut across the south and east of the country. Overall, social, economic and ecological damages are estimated in the tens of billions of $US, while the loss of Ukraine’s economic potential a...

The purpose of our research is to evaluate the agroecological condition of soils under long-term irrigation (over 50 years) and to improve existing measures to slow down degradation processes by introducing phosphogypsum. The possibility of simultaneously addressing the ecological issue of using large amounts of phosphogypsum waste and the agronomi...

Introduction: In recent decades, advancements in technology have started to transform the agriculture industry. Field robots offer a promising solution to enhance efficiency, productivity, and sustainability. However, ambiguous, restrictive legislative boundaries in Czechia, such as confined operating areas or constant operator supervision, hinder...

Purpose. Ecological and economic assessment of the effectiveness of implementing bioenergy technologies for processing organic waste in conditions of technogenic and military risks, while also addressing the need to reduce the extraction of fossil fuels. Methodology. The advanced global experience in bioenergy development is analyzed and considered...

Globally, there is increasing awareness that renewable energy and energy efficiency are vital to creating new economic opportunities and controlling environmental pollution. And it should be kept in mind that environmental pollution and energy insecurity are among the key challenges in the 21st century. Furthermore, the mitigation of CO2 emissions...

Although briquetting is an appropriate technology for the production of renewable energy, its widespreadness in Southeast Asia is limited. Especially due to the high initial investments and energy consumption of a high-pressure briquetting press. However, manual low-pressure briquetting presses (operating pressure <5 MPa) can represent a relevant a...

This study aimed to improve the control system of the biological stage of wastewater treatment using the quality control information system to support the concept of environmental efficiency management. In this case, the object of the study was the treatment facilities of Sumy city (Ukraine). For automatic control of wastewater quality, pH, oxidati...

Anaerobic digestion of manure and other biological waste to produce biogas is common in many developing countries. The residue of manure digestion, bio-slurry or digestate, can be used as fertiliser for crop production and aquaculture. Manure for fishpond fertilisation has become increasingly important in recent years for small-scale African fish f...

One of the major problems facing current agriculture is excessive soil compaction. The solution involves the rational selection of agricultural technology for a particular type of soil. The soil is in a complex stressed condition under the influence of pressure distributed in a certain contact area. The reason for excessive soil compaction is an in...

Human poo contains precious nutrients, but we flush it down the drain to become wastewater. Wastewater often pollutes rivers, lakes, or the ocean. The high levels of nutrients in wastewater, primarily from human poo and pee, can decrease the amount of oxygen in the ocean, killing the fish that we eat along with other organisms. In the old days, poo...

The energy crisis associated with energy poverty in Africa continues to keep millions of men, women and children in absolute poverty due to inadequate access to clean energy. Despite its widely recognised importance for sustainable development, theoretical and policy discourses have largely remained dormant with respect to the role that the paradox...

The tiger nut (Cyperus esculentus L.) is an ideal raw material for oil extraction, but the starch-rich tiger nut meal, a by-product of oil extraction, has not been fully utilized. For this, starch was isolated from the tiger nut meal, then starch nanoparticles were prepared by gelatinization, ultrasonication and nanoprecipitation under different co...

Waste management has been a chronic environmental challenge in Nigeria, coupled with declining economic performance due to energy crises. This study was designed to estimate electricity potential of sewage sludge to meet the 2030 Renewable Energy target. However, there was a need to fill the gap in data related to wastewater management in Nigeria....

The development of organic agriculture is a long-term global trend; with different local factors that affect the development rate. Ukraine is one of the largest food suppliers in the world and this also applies to organic production. The evaluation of organic production at Skvyra Organic Research Station was conducted in 2015-2020 on 40 ha land; fo...

Global climate changes in many countries of the world lead to the need to use irrigation as a driving factor for obtaining guaranteed and stable harvests of agricultural crops. Irrigation with water of different quality leads not only to an increase in the yield, but also to a change in the salt composition of the soil. The change in the salt compo...

The results of theoretical, field and laboratory studies on the assessment of the impact of the storage of low-hazardous waste from the extractive industry on the quality parameters of the soil cover of the adjacent territories, in particular agricultural land, were analyzed. For this, the granulometric composition, the content of organic substance...

Background Over the past three decades, solid-state fermentation (SSF) has gained much attention in biotechnology, allowing efficient production of feed, fuels, industrial enzymes, etc., accompanied by less wastewater and less risk of contamination than submerged fermentation (SmF). Meanwhile, mycoproteins obtained using plant biomass to culture fu...

Important in the cultivation of corn for biogas production is the selection of appropriate hybrids, macro- and micronutrient dozing and the evaluation of energy and economic efficiency of their use. Therefore, this article presents the results of 3-year field research (2019–2021) on the yield of maize hybrids of different maturity groups grown for...

This article is the result of a systematic review of published life cycle assessment (LCA) studies on water and wastewater treatment in Africa. After applying the search and selection criteria, 32 observations for energy use were included and 20 for the global warming potential (GWP) and the eutrophication potential (EP). The dependent variables we...

Nearly 300 million t of phosphogypsum (PG) are produced every year as a byproduct from phosphate fertilizer production worldwide. Approximately 58% of the PG are stacked, 28% are discharged in coastal waters and only 14% are further processed. This critical review provides an overview of the physical-chemical properties of PG produced from sediment...

Purpose. To develop a complex system for technical diagnostics of soil hydrotechnical structures of irrigation systems for operative identification of damaged sites, reduction of nonproduction water losses, and maintaining ecological and economic efficiency of the hydroeconomic national complex in the context of water and food security. Methodology...

The long-term irrigation of extensive areas in the steppe zone of Ukraine using low-quality and mineralized water has caused degradation processes associated with soil salinization. To mitigate or alleviate these processes, researchers investigated the potential of chemical reclamation through the application of phosphogypsum. The study took place...

In light of the massive energy supply shortage due to the Syrian war since 2011, renewable energy adoption has a high potential to cover the actual energy demand. Hence, this study aims to shed light on the factors that affect investment in biogas technology. With the scarcity of research on alternative energies in Syria, this paper focused on the...

Soybean meal is a class of by-products obtained from the processing of soybean products. Despite its high nutritional value, the presence of glycoside isoflavones limits human use of soybean meal. This study evaluated the effect of solid-state fermentation (SSF) with different edible mushroom mycelia (Pleurotus ostreatus, Hericium erinaceus, and Fl...

Research needs of adaptation mechanisms of invasive alien species arises in connection with the naturalization of species of the genus Parthenocissus Planch in forest ecosystems of Ukraine. The results showed that P. quinquefolia has a wide range of values of edaphic and climatic factors. The populations of P. quinquefolia differ according to the d...

The development and efficient use of renewable energy technologies is essential to sustain access to clean energy for all. In developing countries, it is necessary to improve the efficiency of biogas production to contribute to the decarbonization of the energy supply. This study aims to assess the quality of biogas produced from household biogas p...

This article is focused on performing a SWOT analysis of agricultural waste management methods. This approach can be applied in the biogas technology strategic planning process in Ukraine, which can solve the issue of implementation of environmental guidelines for the development of biofuels and biofertilizers. The main factors that determine how d...

Biogas production at a small-scale level through anaerobic digestion has been promoted in Vietnam as an appropriate technology for cooking and animal waste management within rural households. Despite the large number of small-scale biogas plants being built, there is an increase in the reported cases of their dis-adoption. This study attempts to pr...

This study was conducted to evaluate effects of biochar levels in diets on in vitro methane emission and rumen fermentation. Biochar, produced from rice husk, pyrolysis at 700 °C, was supplemented in diets at 0, 1, 3, 5, and 7% (dry matter (DM) basis). Total gas, methane production, dry matter (DM) and organic matter (OM) digestibility, pH, and NH3...

This article presents future trends in research using microbiological methods to intensify bioprocesses for biogas production. The pretreatment by combinations of physical and chemical methods, such as cavitation and electrolysis, is considered. The approach of the article involved reviewing the residual area on the intensification technologies of...

Topical applied and scientific problem concerning the evaluation of technical condition of retention basins of irrigation systems has been highlighted. The expediency of comprehensive use of geophysical methods of the natural pulsed electromagnetic field of the Earth as well as vertical electrical sounding to identify deformation zones of agricultu...

The soybean (Glycine max) is used as one of the main protein sources in various animal fodders. However, the presence of anti-nutrients significantly reduces the nutritional value of the bean. To solve this problem, the present work is devoted to the inactivation of the anti-nutrients in soybeans by the use of micronisation as a means of thermal tr...

The preliminary data from audit energy study from tofu industry in Indonesia. The study focus on the amount of water consumption and wastewater consumption to determine how much the potential of sources as feedstock for biogas.

Biogas technology has the potential to achieve at least eight of the Sustainable Development Goals (SDGs). This study assessed household biogas consumption against firewood and its socioeconomic and environmental impacts with regard to achieving the SDGs in the Iganga District, Uganda. In addition, factors hindering the adoption of biogas technolog...

Both developed and developing countries are working towards creating an emission free planet. Vietnam, as one of the highest contributors to greenhouse gas emissions, has implemented several policies to curtail this phenomenon. Most of these policies are geared towards the development of renewable energy technologies such as biogas. The country’s p...

The sustainable production and use of small-scale biogas energy are required to ensure clean household energy access in developing countries, including the Sub-Saharan Africa (SSA) region. This is influenced by market risks, which can be identified as political, economic, social, technical, legal, and environmental (PESTLE). This study examines pee...

Highlights The forced and natural convection drying processes of a single coffee grain can be predicted. The moisture distribution profiles depict the drying phenomena and water concentration zones. With accurate predictive drying curves, coffee growers can ensure high-quality coffee beans. Abstract . Different coffee drying technologies face comp...

By 2025, biogas is estimated to become a larger part of Indonesia’s energy mix. Biogas is a renewable energy source that also has economic and environmental advantages. Domestic biogas generation has been embraced in Indonesia as a response to the country’s energy security concerns in rural areas. Since the 1970s, 48,038 biogas plants have been bui...

We recommend that the EU acts today so that there will be a chance to close the upcoming EU gypsum gap tomorrow. Applied interdisciplinary research with a strong industrial focus should be preferred to make PG available as an economically competitive gypsum substitute that can be used in construction and agriculture, fulfilling national regulations...

The aim of this study was to investigate the effects of biochar produced from tropical biomass resources at different processing temperatures on methane production and rumen fermentation in vitro. Two available tropical biomass resources of rice husk and peanut shell were used for pyrolysis at three temperature levels of 300, 500 and 700oC. Biochar...

Due to current water stress, there is a problem with hygiene and sanitation in many parts of the world. According to predictions from the United Nations, more than 2.7 billion people will be challenged by water scarcity by the middle of the century. The water industry is increasingly interested in desalination of the sea, ocean, and brackish water....

The final composition of volatile components in the process of oxidative pyrolysis depends on the temperature level of the process. The gas output increases with the growth of hydrogen, methane and heavy hydrocarbons concentration in the process of pyrolysis in the range of 200-500°C. In this case, there is a noticeable decrease in undesirable impu...

This study aimed to evaluate the effects of biochar produced from tropical biomass resources (rice straw, corncob, and bamboo) at different processing temperatures (300, 500, and 700 °C) on in vitro rumen fermentation and methane production. Treatments were arranged as a 3 × 3 factorial design with three biomass resources and three biochar processi...

Winter wheat is one of the widespread crops in Ukraine. The search for methods to increase the yield and consumer properties of wheat, without compromising environmental safety, is one of the important scientific problems. The principles of precision agriculture point to the proper positioning of the seeds, recommending the method of “upward germin...

The article uses an interdisciplinary approach to study the links between urbanization and the state of the green infrastructure of the metropolis, which indicates the possibility of providing ecosystem services. This is important for the formation of a better management policy of green urban space for the sustainable development of the metropolis....

The sustainable production and use of small-scale biogas energy is needed to ensure clean household energy access in developing countries including the Sub-Saharan Africa (SSA) region. This is influenced by market risks which can be identified as political, economic, social, technical, legal and environmental (PESTLE). This study examines peer-revi...