hydrolysis
E =bioprocess effieciency ( E = Y P/S / Y P/ST . 100; Y P/S =conversion coefficient of substrate into ethanol (g C 2 H 5 OH/g sugar), Y P/ST =theoretical conversion coefficient of substrate into ethanol (g C 2 H 5 OH/g sugar)), P max =maximal ethanol productivity in bioprocess
Two energy-demanding separation steps are necessary to obtain purified ethanol (95.63% by mass) from binary azeotrope ethanol-water ( 54 ). The first step is a standard distillation that concentrates ethanol up to the level of 92.4–94% by mass. The cyclic distillation for ethanol purification is an energy-efficient alternative that is characterised by relatively low investments. The second step involves ethanol dehydration to obtain an anhydrous ethanol (ethanol concentrations above the azeotropic composition). Several well known methods serve that purpose, such as pressure-swing distillation ( 134 , 135 ), extractive distillation (with liquid solvent, dissolved salt, their mixture, ionic liquids, hyperbranched polymers) ( 136 - 139 ), azeotropic distillation ( 140 , 141 ) and combination of these methods. The distillation residue is called vinasse and it could be an environmental problem because 1 L of ethanol generates around 15 L of vinasse ( 38 ).
In the next paragraphs we will discuss innovative techniques. In order to reduce energy consumption of conventional distillation, membrane techniques have gained attention as an alternative because of a number of advantages that make them attractive for the separation of liquid mixtures. They have high separation efficiency, energy and operating costs are relatively low, they produce no waste streams, and they can be used in the separation of temperature-sensitive materials ( 142 - 145 ). Among the available membrane techniques, pervaporation is quite attractive due to its simplicity, low energy-demands and the absence of extra chemicals; besides, the vacuum part of the process consumes the majority of energy ( 54 ). It uses a non-porous membrane which separates the mixture as a result of molecular interactions between the feed components and the membrane. The transport of molecules through the membrane generally involves three steps: ( i ) molecules from the feed are selectively adsorbed into the membrane, ( ii ) diffusion of the adsorbed molecules across the membrane, and ( iii ) desorption of the molecules into the gas phase on the permeate side. Polymeric membranes which can be used in the ethanol separation from the fermentation broth include polydimethylsiloxane (the most commonly used because of its good selectivity and stability) and poly-1-(trimethylsilyl)-1-propyne membranes, polyether block amide membranes, other modified polymeric membranes, porous polypropylene and polytetrafluoroethylene membranes ( 146 - 149 ). Besides the above mentioned, inorganic hydrophobic zeolite membranes can also be used ( 150 ). Furthermore, two types of hydrophobic zein (monolayer and composite) membranes were also studied for ethanol separation ( 151 ).
Pervaporation can be carried out in parallel to the fermentation. This is promising system for in situ extraction of ethanol, which is harmless to the working microorganism ( 152 ). Therefore, low ethanol medium concentrations can prevent ethanol inhibition, and consequently the bioprocess can run continuously. Before the pervaporation unit, a microfiltration/ultrafiltration module has to be installed for biomass removal to prevent deterioration of the pervaporation membrane. This integrated system was used in the study of ethanol separation from aqueous solution and fermented sorghum juice ( 152 ). Cost analysis of the separation from the fermented juice showed it is higher than in some other methods, therefore it is necessary to optimize the procedure.
The silicalite-1/polydimethylsiloxane/polyvinylidene fluoride hybrid composite membrane was used for the in situ extraction of ethanol during the fermentation of sorghum juice in a fed-batch and a continuous bioprocess ( 153 ). The results of this study show that the integration of bioprocess considerably improves the bioprocess productivity and ethanol separation efficiency. The nanocomposite membrane made of polyamides with integrated carbon nanotubes was also used for ethanol separation ( 154 ). The results show that the membrane is most effective when used for the separation of mixtures with an ethanol content of more than 50% by mass. The temperature of the mixture also plays a significant role; at higher temperatures, there is an increase in the permeate flux, but the separation factor decreases.
Liquid-liquid extraction is another attractive method for ethanol separation from fermentation broth ( 155 ). The process involves the direct contact of a water-insoluble solvent with the broth in the bioreactor or in an externally located extraction vessel. During the contact, ethanol diffuses from the broth and is dissolved in the solvent, after which it needs to be isolated from the solvent with distillation or re-extraction using acid or base solutions. The selected solvent must meet some criteria, such as satisfactory extraction efficiency, chemical stability, water insolubility, must not form foam or emulsion, must be nontoxic, environmentally friendly and affordable. The most attractive solvents are ketones, esters and alcohols due to their low reactivity and high distribution coefficients (ketones 0.13–0.79, alcohols 0.53–1.30 and esters 0.24–0.59). Most of the interesting solvents were discarded because of their toxicity to the working microorganisms. The toxicity problem could be solved by using natural organic compounds, such as fatty acids, β-alcohols and carboxylic acids ( 155 ). Therefore, several fatty acids as solvents for ethanol extraction from water were examined ( 156 ). Valeric acid, a low-molecular-mass fatty acid, extracted the highest amount of ethanol, but alongside, it extracted water and it is partly soluble in it. The same was reported for other low-molecular mass fatty acids ( 156 ). Oleic acid is insoluble in water, but it extracted a small quantity of ethanol. Octanoic and nonanoic acid proved to be the best; however, nonanoic acid was the most suitable solvent because of its minimal evaporation during flash distillation, which resulted in a gaseous mixture with 69.5% ethanol. This method requires 38% less energy for the same amount of ethanol than fractional distillation ( 156 ).
The efficiency of ethanol extraction using vegetable oils, such as coconut, olive, safflower and castor oil, and their derivatives, alcohols and esters was also examined ( 157 ). These oils were compared with the following esters: methyl laurate, methyl oleate, methyl linoleate, and methyl ricinoleate, and alcohols: lauryl (1-dodecanol), oleyl and ricinoleyl. Out of these compounds, castor oil, ricinoleyl alcohol and methyl ricinoleate showed higher ethanol distribution coefficients with similar or slightly lower separation factors than other compounds used in this study. It is interesting that ricinoleyl alcohol has a 50% higher distribution coefficient than oleyl alcohol, the most commonly used alcohol in ethanol extraction from fermentation broth. The use of higher β-branched alcohols, and their analogues in the form of carboxylic acids was also studied ( 158 ). The results showed that the C14-C20 β-branched alcohols have a narrow range of distribution coefficients (0.2–0.3), but a wide value range of separation factors, which reflects the influence of the position of hydroxyl groups and branching. Due to the low distribution coefficient values, the use of such alcohols is not recommended, but due to their non-toxicity and low solubility in the raffinate, as compared with shorter chain alcohols, it is possible to select and define the conditions of their application. Comparing the results of that study with the results obtained for carboxylic acids (C8-C18), it is obvious that acids have higher separation factors, and lower distribution coefficient values ( 159 ). Although it is preferable to use acids with shorter chains with higher distribution coefficients, their solubility in water and toxicity on the working micoorganisms prevents it. It is therefore advisable to use C16-C18 fatty acids as they are less soluble in the raffinate, are non-toxic and non-inhibitory.
Gas stripping is another alternative to distillation for the extraction of volatile components, such as ethanol, from fermentation broth ( 160 - 162 ). The process is relatively simple, does not require expensive equipment, fermentation culture is not harmed, it does not remove nutrients from the broth, it reduces product inhibition and it can be used for in situ separation of the desired product. In this method, inert gas is sparged through the broth. By passing through the broth, it collects volatile components. The most suitable gas is CO 2 , as it is one of the fermentation products, but other gases (N 2 or H 2 ) and air can also be used ( 163 ). After passing through the bioreactor, the outflow is cooled in a condenser in order to condensate the desired products. Besides condensation, other methods can also be used, such as membrane separation and extraction ( 160 , 164 - 166 ). The gas is then recycled by going through another cycle of stripping. In most cases, the alcohol-rich condensate must pass through at least one purification step to remove excess water. Research results show that by using gas stripping, higher ethanol yield and productivity can be achieved.
Several studies of ethanol separation by gas stripping from fermentation broth during continuous bioprocess we- re conducted ( 167 , 168 ). These studies examined the effect of ethanol concentration on working microorganism and bioprocess productivity. The pilot plant consisted of a 14-litre bioreactor and a 10-cm column, and the bioprocess was continuously run for over 100 days. The feed contained 560 g/L glucose and 100 g/L corn steep water. CO 2 produced by fermentation was used as the stripping gas. The productivity of the process varied between 14 and 17 g/(L·h). In a similar study ( 169 ), a pilot plant with a fermentor of 30 L was run for 185 days. The yield was slightly lower than the maximum theoretically possible (0.50 g/g), which resulted in an average bioprocess productivity of 7.5–12.6 g/(L·h). In both studies growth inhibition occurred when the broth ethanol concentration was higher than 65 g/L. Chen et al . ( 170 ) compared ethanol production from sorghum with or without gas stripping. Fermentation with gas (CO 2 ) stripping proved to be a better choice for ethanol production, because the yield was 0.227 g/g with a stripping efficiency of 77.5%. Temperature is one of the most important parameters in the fermentation and stripping processes. With the increase in temperature, stripping efficiency increases. The highest ethanol extraction efficiency of 96.4% was at 75 °C, but this temperature has a negative effect on microorganism growth, and increases the energy costs. It is therefore necessary to adjust the stripping temperature to the microorganism, or use heat-resistant microorganisms while keeping in mind that fermentation temperature should not be higher than 40 °C. It was also observed that the gas bubble size has an influence on the efficiency of stripping. By reducing the bubble size from 0.4 cm to 0.05 cm, an increase of 30% in efficiency was observed. Ponce et al . ( 171 ) assessed an integrated fermentation stripping system for ethanol production. In that research, 58% of total ethanol in the broth was continuously withdrawn from the bioreactor. Although the removal of ethanol was not complete, the percentage that was removed was sufficient for ethanol concentration to drop below the inhibitory values. Lower condensation temperatures have a negative impact on the ethanol concentration in the condensate. The most interesting temperatures are in the range of –2 to –5 °C because at these temperatures a significant amount of ethanol was obtained. As for the gas flow, it was concluded that higher flow rates encourage better ethanol separation from the system and therefore increase the overall bioprocess efficiency.
Adsorption is a separation technique in which molecules of gas or solution components are adsorbed on the solid surface (adsorbent). The adsorbent is a stable crystalline solid having negligible or no solubility in water or alcohol. Substances are adsorbed onto it depending on their physical and chemical properties. Generally, larger particles are more easily adsorbed due to their low diffusivity. Adsorbents are usually located in column devices. Unlike systems with gaseous or liquid extractants, the solid adsorbent does not move through the system. Therefore, adsorption involves two phases, the loading phase (adsorption) and the discharge phase (desorption). Similar to liquid extractants, a solid adsorbent has a specific selectivity and sorption distribution coefficients for water and ethanol. The most studied class of alcohol-selective adsorbents are hydrophobic zeolites, in particular zeolites with a ZSM-5 structure and various silicon and aluminium ratios ( 172 - 174 ). The most important zeolite of this type is silicalite-1, which does not contain aluminium. Other adsorbents that have been studied are polymeric resins, polyvinylpyridine ( 173 ), activated carbon ( 173 , 174 ) and activated carbon molecular sieves ( 175 ). Studies conducted with silicalite-1 showed that water and ethanol compete for sorption sites on the adsorbent. When pure water was used, silicalite-1 adsorbed 40 mg/g water, whereas when a mixture containing ethanol and water was used, there was a decrease in the adsorption of water. At 5% by mass ethanol, about 85 to 100 mg/g ethanol was adsorbed onto the surface, and only about 20 mg/g water, which is equal to a separation factor of 76 ( 174 ).
For ethanol recovery from fermentation broth, silicalite-1, ZSM-5 and activated carbon molecular sieves (CMS-5A) were also examined as adsorbents ( 176 ). ZSM-5 adsorbed 0.068 g/g ethanol, silicalite-1 0.084 g/g and CMS-5A 0.126 g/g. Silicalite and ZSM-5 did not adsorb measurable quantities of glucose, fructose and glycerol, while CMS-5A adsorbed 0.011 g/g glucose, 0.010 g/g fructose, and 0.014 g/g glycerol. The measurement of ethanol adsorption from broth showed that it decreased only slightly, while there was a notable reduction in sugar and glycerol adsorption ( 176 ). In a recent study, activated carbon as an adsorbent for ethanol separation from fermentation broth was studied ( 177 ). They used two separation modes; in the first activated carbon was added directly into the broth, while in the second it was placed in an external container through which the broth circulated at specific time intervals. The second method proved to be much more efficient with final ethanol concentration of 51 g/L.
The new adsorption process that uses activated molecular sieving carbon (MSC) was also studied ( 175 ). The pore diameter of the sieves was around the size of an ethanol molecule. Experiments were conducted using five different MSCs, which were compared with two hydrophobic zeolites, and one hydrophilic zeolite adsorber. The total pore adsorption capacity of the MSCs was 0.2 mL/g. The most promising adsorbent was MSC4A, which, after adsorption and desorption at temperatures higher than 100 °C, helped to obtain a mixture with 96% by volume ethanol ( 175 ).
On the basis of previous discussion, it is obvious that the majority of studies still use two-component ethanol and water solutions, without taking into account other substances present in the fermentation broth. It is therefore necessary to conduct further research in order to check the influence of other components on adsorption, or to investigate other methods that can be coupled with adsorption to facilitate the separation and purification of ethanol. Some of the methods that can be used with adsorption are ozonation ( 178 , 179 ) or gas stripping ( 180 , 181 ).
Based on the presented data, it is obvious that bioethanol can be an alternative solution for the current fuel issue. There has been significant progress in renewable biomass pretreatment, cellulase production and cofermentation of sugars (pentose and hexose) as well as bioethanol separation and purification in recent decades, but bioethanol (based on the production costs) is still not competitive (exception can be only bioethanol production from sugar cane in Brazil) to the fossil fuels. The biggest challenge remains how to reduce the production cost of bioethanol. Therefore, the biorefinery concept is needed to utilize renewable feedstocks more comprehensively and to manufacture more value-added coproducts ( e.g. bio-based materials from the lignin) that would reduce the cost of bioethanol production. This will make bioethanol more economically competitive than the fossil fuels.
This work received support by the project Phoenix (H2020--MSCA-RISE project No. 690925) and the project “Sustainable production of bioethanol and biochemicals from agricultural waste lignocelullosic raw materials” (Croatian Science Foundation No. 9158).
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June 20, 2024 | Anna Zarra Aldrich, College of Agriculture, Health and Natural Resources
A recently published paper highlights the current state of sustainable food production research, from food nanotechnology to plant-based options and urban agriculture.
(Unsplash Photo/Sven Scheuermeier).
Sustainability is a hot topic in just about every field that engages with the environment, including agriculture.
The group includes Yangchao Luo, associate professor of nutritional sciences; Zhenlei Xiao, associate professor-in-residence of nutritional sciences; and Abhinav Upadhyay, assistant professor of animal science. Bai Qu, Luo’s Ph.D. student, is the lead author on the paper.
Sustainable food production focuses on creating food systems that are environmentally sound, economically viable, and socially equitable.
“It focuses on the entire food supply chain, from farm to table, ensuring that each step is sustainable, minimizes waste, and reduces the carbon footprint,” Luo says.
The paper outlines the key features of sustainable food production including environmental stewardship, economic vitality, innovation and adaptation, and social responsibility.
The paper also reviews green technologies like urban agriculture, food nanotechnology, and plant-based foods, all of which play a role in reducing the negative impacts of food production.
“This is not a new concept, but I think with the development of emergent technology, a lot of things are going on now, it is very important to revisit this concept,” Luo says.
This publication provides a holistic and interdisciplinary perspective on the topic.
“Sustainable food production is a very collaborative topic,” Luo says. “You cannot do everything on your own.”
Sustainable food production encompasses the concept of a circular economy in which the waste from one process or product can be reused elsewhere.
“People have not cared about the waste generated, the impact to the environment, whether it’s sustainable or not,” Luo says. “People are pretty much profit driven. Now we have to change the whole concept or else the entire agricultural industry cannot be sustainable.”
This paper reflects the College and UConn’s broader commitment to sustainability, Luo explains.
“There’s many things in the College and at the University, campus-wide, that flow into this area that really inspire me to dive deeper into this topic,” Luo says.
Luo and Upadhyay are co-PIs on a $10 million grant from the USDA to study sustainable poultry production. The grant is led by Kumar Venkitanarayanan, associate dean of research and graduate education in CAHNR.
Luo, co-chair for CAHNR’s committee for sustainable agriculture and food production, is currently working with a group of students to develop an organic poultry feed additive made from microalgae.
“You cannot think about sustainable agriculture from a single discipline,” Luo says. “It has to be highly collective and collaborative from all three areas – society, environment, and community health. You have to connect all three angles together.”
This work relates to CAHNR’s Strategic Vision area focused on Ensuring a Vibrant and Sustainable Agricultural Industry and Food Supply.
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A gauge of global stocks declined for a second straight session on Friday, weighed down by weakness in technology shares, while the dollar hit its highest level since early May as a gauge of U.S. business activity edged up to a more than two-year high.
In July 2022, Congress passed the CHIPS Act of 2022 to strengthen domestic semiconductor manufacturing, design and research, fortify the economy and national security, and reinforce America’s chip supply chains.
The share of modern semiconductor manufacturing capacity located in the U.S. has eroded from 37% in 1990 to 12% today, mostly because other countries’ governments have invested ambitiously in chip manufacturing incentives and the U.S. government has not. Meanwhile, federal investments in chip research have held flat as a share of GDP, while other countries have significantly ramped up research investments.
To address these challenges, Congress passed the CHIPS Act of 2022, which includes semiconductor manufacturing grants, research investments, and an investment tax credit for chip manufacturing. SIA also supports enactment of an investment tax credit for semiconductor design.
By passing the CHIPS Act, Congress has risen to a defining challenge of our time, seized an historic opportunity to fortify American semiconductor manufacturing, design, and research, and delivered a big win for our country.
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Michael f. wondrak, walter d. van suijlekom, and heino falcke, phys. rev. lett. 130 , 221502 – published 2 june 2023, see synopsis: another way for black holes to evaporate.
We present a new avenue to black hole evaporation using a heat-kernel approach analogous as for the Schwinger effect. Applying this method to an uncharged massless scalar field in a Schwarzschild spacetime, we show that spacetime curvature takes a similar role as the electric field strength in the Schwinger effect. We interpret our results as local pair production in a gravitational field and derive a radial production profile. The resulting emission peaks near the unstable photon orbit. Comparing the particle number and energy flux to the Hawking case, we find both effects to be of similar order. However, our pair production mechanism itself does not explicitly make use of the presence of a black hole event horizon.
DOI: https://doi.org/10.1103/PhysRevLett.130.221502
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Published by the American Physical Society
Published 2 june 2023.
The gravitational fields of black holes and other compact objects are strong enough that they might wrest massless particles out of the vacuum and into existence, causing the objects to decay.
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Vol. 130, Iss. 22 — 2 June 2023
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Schematic of the presented gravitational particle production mechanism in a Schwarzschild spacetime. The particle production event rate is highest at small distances, whereas the escape probability [represented by the increasing escape cone (white)] is highest at large distances.
Radial profile of the production of particles escaping to infinity per unit Schwarzschild time t .
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