Prospects of Bioethanol from Agricultural Residues in Bangladesh

Version	Summary	Created by	Modification	Content Size	Created at	Operation
1		Himan Miah	--	2732	2023-06-26 14:24:21	\|
2	references update	Fanny Huang	-3 word(s)	2729	2023-06-28 08:40:00	\|

This entry is adapted from the peer-reviewed paper 10.3390/en16124657

Since Bangladesh is an agricultural country, bioethanol could be the best alternative fuel generated from agricultural residues and waste. Every year, a large amount of agricultural residue is generated in this country, from which a vast amount of bioethanol could be produced. Bioethanol derived from agricultural residue and waste can reduce dependency on fossil resources, reduce fossil fuel’s environmental impact, and improve engine performance.

renewable energy waste to energy biofuel lignocellulosic biomass

1. Feedstock for Bioethanol

To produce bioethanol, any feedstock with a considerable level of sugar or sugar-producing materials, such as starch or cellulose, can be utilized ^[1]. Bioethanol feedstocks are categorized into three major kinds: sugar-containing feedstocks (e.g., sugar beets and sugar cane), starchy materials (e.g., cassava, potatoes, and root crops), and lignocellulosic biomass (LCB) (e.g., agricultural residues) ^[2]. LCB, such as agricultural residues, is a sustainable alternative feedstock for bioethanol production because of its availability, low cost, higher ethanol yields, and efficiency. LCB from agricultural residues provides a plentiful, renewable supply of carbohydrates for microbial processing into fuels and chemicals ^[3]. Every year, more than 442 billion gallons of bioethanol can be generated from lignocellulosic biomass, which is about 16 times the current world bioethanol production ^[4]. Rice straw is one of the most plentiful lignocellulosic wastes in the world as well as in Bangladesh. LCB is mainly composed of three significant elements, i.e., cellulose, hemicellulose, and lignin, and each changes according to the source of the lignocellulosic material ^[5]. Table 1 represents the cellulose, hemicellulose, and lignin compositions of lignocellulosic feedstocks available in Bangladesh ^[6]^[7]^[8].

Table 1. The percent of biochemical mix of lignocellulosic biomass feedstocks that are the most accessible in Bangladesh ^[6]^[7]^[8].

Residues	%wt. on a Dry Matter Basis
Residues	Cellulose	Hemicellulose	Lignin
Rice straw	28–36	23–28	12–14
Wheat straw	33–38	26–32	17–19
Maize stover	35–40	21–25	19–21
Jute	37–48	12.18–12.3	27.9–35.3
Sugarcane	25–45	28–32	15–25
Tobacco	30.22	40.28	21.06

1.1. Cellulose

Cellulose (C₆H₁₀O₅) is a hexose sugar that is an important part of plant cell walls. It can be easily produced from biomass by using a pretreatment process. It is a linear, unbranched, homopolysaccharide-type organic polymer of glucose monomers (D-glucose anhydrous) coupled to β-(1,4)-glycosidic linkages. It consists of a long chain of small repetitive glucose units collected in microfibril bundles ^[9]. Cellulose is extremely crystalline, insoluble in water, and permits hydrolysis processes, known as saccharification, to dissolve the polysaccharide to release sugar molecules by increasing the water concentration ^[10]. Through the biological process of hydrolysis, cellulose releases glucose, which is then converted into a variety of compounds, such as bioethanol.

1.2. Hemicellulose

Hemicellulose (C₅H₈O₄)n is a short, branched heteropolymer composed primarily of 5-carbon (pentose) (e.g., D-xylose) and 6-carbon (hexoses) (e.g., D-glucose) sugars that are typically located in primary and secondary cell walls of biomass ^[11]. It is present in almost all soil-plant cell walls along with cellulose. Although cellulose is crystalline, robust, and immune to hydrolysis, hemicellulose has little strength and is in a random, amorphous arrangement. It is readily hydrolyzed by dilute acids or bases and countless hemicellulose enzymes ^[12]. Because of its low degree of polymerization, hemicellulose has a lower molecular weight than cellulose. This distinctive polymer forms a complex network with cellulose via hydrogen bonds and lignin via covalent interactions ^[11]. Yeasts that can ferment pentose may convert xylose into single-cell proteins (SCP) and a range of solvents and fuels like bioethanol ^[3].

1.3. Lignin

Lignin [C₉H₁₀O₃(OCH₃)]n is a three-dimensional, heterogeneous, and crosslinked aromatic polymer of propyl phenol. The three main aromatic phenols are coniferyl alcohol, sinapyl alcohol, and a minor quantity of p-coumaryl alcohol ^[13]. Since lignin is covalently linked to distinct hemicellulose side groups, strong carbon-carbon (C–C) and ether (C–O–C) connections in lignin offer strength and protection to the plant tissue against assault by cellulolytic microorganisms and functions like glue. Lignin is one of the barriers to LCB fermentation since it is unaffected by chemical and biological degradation yet has an impact on the quality of the bioethanol output ^[14].

Utilization of Lignin

Due to the heterogeneity and recalcitrant tendency of lignin, which is the second most abundant natural polymer (when considering only forest biomass otherwise chitin is second when considering all types of biomass), it is not affected by the fermentation process as a bioethanol production method resulting in fermentation residue (FR) waste after producing bioethanol from agricultural residues. Therefore, the appropriate use of FR will make the biorefinery process more viable, thereby reducing waste, maximizing resource use, and achieving circular economy goals. The amount of lignin found in nature is estimated to be 0.5–3.6 billion tons per year, with the cellulosic ethanol industry producing 1–2 lack tons and pulp and paper manufacturing producing 40–50 million tons ^[15]. A report by Ahuja and Deb of Global Market Research mentions that the lignin market would exceed USD 960 million by 2024 ^[16]. Furthermore, the aromatic lignin marketplace is predicted to proliferate by more than 4.5% by 2024 due to strong manufacturing demand for phenol derivatives, which are used in several industries including the cosmetic industry. Therefore, it is crucial to utilize lignin more effectively to make industrial-scale bio-refinery plants cost-competitive. Lignin is an aromatic feedstock that is present in almost every plant cell, typically found in the range of 15–30% by dry mass and 40% by energy ^[17]. Considering an ethanol yield of 355 L per dry ton of biomass, 46.5 million tons of biomass could generate 12.9 million tons of lignin (i.e., FR) in the fiscal year 2019–2020 in Bangladesh. The lignin can be utilized to produce fuels, heat, value-added materials, and chemicals. Utilizing these materials, several industries like the chemical industry, plastic industry, dyeing industry, cosmetic industry, automobile factories, resin production, power production, etc., could meet their demand which can lead to a circular economy in Bangladesh.

2. Bioethanol Conversion from Lignocellulosic Biomass

Bioethanol generated from LCB is usually identified as 2G bioethanol. Different steps are used to generate bioethanol from LCB such as (1) pretreatment, (2) enzymatic hydrolysis, and (3) fermentation of sugar. After these main steps, distillation and purification are used to fulfill fuel standards. These steps can be performed separately as well as together with several advancements. Different methods are available for biomass bioconversion to prepare bioethanol ^[18]. Each stage must be combined properly to obtain a larger bioethanol output in a cost-effective and long-term manner.

2.1. Pretreatment

Pretreatment is the first, most expensive, and most important step of the bioconversion process to produce ethanol from LCB, and it differentiates LCBs as a 2G feedstock from the 1G feedstock. The objective of the various pretreatment processes is to change or eliminate the structural and compositional obstacles from cellulose and hemicellulose that prevent hydrolysis to maximize the rate of enzyme hydrolysis as well as fermentable sugar yields ^[19]. Pretreatment is commonly used to separate lignin and hemicellulose from cellulose, which allows the cellulose to be hydrolyzed and converted into bioethanol. Pretreatment can be performed in various ways, such as (1) physical (chipping, milling, and grinding), (2) physio-chemical (steam pretreatment, hydro thermolysis, and wet oxidation), (3) chemical (organic solvents, oxidizing agents, dilute acids, and alkali), and (4) biological pretreatments. The different types of pretreatment methods available for LCB processing to produce accessible cellulose for effective hydrolysis have been reviewed comprehensively in several review articles ^[5]^[6]^[20]^[21]^[22]. Table 2 depicts various pretreatment methods for LCB that have been previously experimented with to improve ethanol production. A successful pretreatment procedure aims to (i) create the maximum amount of available sugars directly or indirectly through hydrolysis, (ii) limit inhibitory product creation, and (iii) reduce expenses ^[23].

Table 2. Different methods of biomass pretreatment for bioethanol yield and their main pros and cons.

Pretreatment	Condition	Main Advantage	Main Disadvantage	Pretreated Residue Examples	Sugar Yield/ Cost ^[24]	Ref.
(a) Physical
Milling and grinding	Ball mill: 0.2–2 mm final particle size	No chemical used Reduces cellulose crystallinity	Consumes more power	Hardwood, corn straw, corn stover, sugarcane, bagasse	L/H	^[6]^[25]^[26]
Extrusion	Screw speed: 75 rpm, barrel temperature: 125 °C	No degradation products formed	Considerable aberration of metal face	Corn cobs, switchgrass, wheat bran,	H/H	^[27]^[28]
Microwave	1% NaOH, 600 W, 4 min	Quick heat transfer	High reactor cost	Sugarcane bagasse	L/H	^[29]
(b) Physicochemical
Acid-catalyzed steam explosion (ACSE)	T = 160–200 °C, dilute H₃PO₄ or H₂SO₄ (1–3% w/v), t = 5–30 min	Increased enzymatic accessibility	Higher acquisition and handling costs	Barley straw, Arundo donax, green wood	H/H	^[30]^[31]^[32]^[33]
Ammonia fiber explosion (AFEX)	T: 90–140 °C, P: 1.12–1.36 MPa, t: 30–60 min; ammonia: dry biomass = 1:1–1:2	Volatile ammonia is recoverable and reusable	Inefficient for lignin-rich biomasses	Wheat straw, barley straw, rice husk, corn stover	H/H	^[6]^[34]
(c) Chemical
Ozonolysis	Ozone	No inhibitors formed	Requires a significant amount of ozone	Wheat straw, cotton straw	H/H	^[6]^[26]
(d) Biological	Fungus or bacteria	No chemicals required	Slow process	Corn stover, wheat straw	L/L	^[35]^[36]

Note: T = temperature, P = pressure, t = time.

2.2. Hydrolysis

The cellulose is prepared for hydrolysis after the pretreatment process. Cellulose hydrolysis is the process of converting glucose from cellulose, known as saccharification. Polysaccharides are broken down into sugars by the hydrolysis process. The strategy of hydrolysis of biomass is broadly categorized into two major divisions: chemical (concentrated acid) and enzymatic ^[22]. Because of some disadvantages of chemical methods (costly, toxic, corrosive, inhibitor formation, and dangerous), enzymatic hydrolysis is more promising. Enzymatic hydrolysis is more interesting because it builds a higher yield than acid-catalyzed hydrolysis without inhibitor formation and because the use of advanced biotechnology reduces enzyme prices ^[37]^[38]. The productivity of enzymatic hydrolysis is affected by several factors, including molecular structure, fiber surface area, hydrolysis duration, and enzyme loading. Cellulases, which are extracted from fungi (e.g., Trichoderma reesei) or bacteria (e.g., Bacteroides), are in high demand as industrial enzymes because they are widely used in a variety of sectors, such as the pulp and paper industry, the textile industry, food factories, and lignocellulosic processing for ethanol production ^[39]^[40]. To increase the yield and hydrolysis rate, researchers have concentrated on optimizing the hydrolysis procedure and boosting cellulase activity. Currently, several surfactants such as polyethylene glycol (PEG), bovine serum albumin (BSA), Triton X-100, Tween, sodium dodecyl sulfate (SDS), and lignosulfonate are widely used as lignin blockers to reduce the inhibition of unproductive enzyme binding on enzymatic saccharification and improve enzyme efficiency and stability ^[41]^[42]^[43]^[44]. For instance, adding Tween 80 improves hydrolysis efficiency by increasing enzyme accessibility to the substrate and enhancing mass transfer rate, which can enhance glucose output by 26.6–99.6% ^[45]. Similarly, polymers containing polyethylene glycol (PEG) have been used to improve hydrolysis efficiency because they can change the surface properties of cellulose, resulting in lower enzyme loading ^[46]^[47]. Improving the operability of enzymatic hydrolysis by using higher substrate concentrations, such as xylanase, is promising for bioethanol production because it affects the rate of hydrolysis to maximize glucose yields ^[48]. Ostadjoo et al. carried out a study with xylanase, which allows hemicellulose hydrolysis, and different feedstocks of varying concentrations, such as xylans from wheat straw biomass and sugarcane bagasse ^[49]. Overall, in order to convert cellulose to bioethanol efficiently, the influencing parameters must be optimized.

2.3. Fermentation

The hydrolysate formed after hydrolysis is utilized by microorganisms (like yeast and bacteria) for bioethanol fermentation. Under various fermentation conditions, the most popular hexose- and pentose-fermenting yeasts utilized in bioethanol production are Saccharomyces cerevisiae (S. cerevisiae) and Pichia ^[50].

Microorganisms consume fermentable carbohydrates as substrate and create ethyl alcohol and other byproducts in the process. The 6-carbon sugars are the most plentiful and are frequently used by these microbes (C₆H₁₂O₆ (glucose)

\to

2C₂H₅OH + 2CO₂) to produce bioethanol. As a result, cellulosic biomass materials that contain a high amount of glucose or glucose precursors are the simplest to transform into bioethanol. After the pretreatment process, the hydrolysis and fermentation processes can be performed individually or simultaneously. Currently, the following advanced methods are frequently used in bioethanol production: simultaneous saccharification and fermentation (SSF), separate hydrolysis and fermentation (SHF), simultaneous saccharification and co-fermentation (SSCF), and consolidated bioprocessing (CPB) ^[51]. In SSF, the cellulose is broken down and fermented simultaneously in the presence of the microbes. Fermenting more than one form of sugar, such as pentoses and hexoses, the SSCF fermentation process employs the integration concept of mixed microorganisms. LCB hydrolysis is performed separately from the fermentation stage in SHF. Table 3 shows the main advantages and disadvantages of the different bioethanol production processes ^[3]^[52].

Table 3. The main advantages and disadvantages of the SHF, SSF, SSCF, and CPB processes ^[3]^[52].

Process	Main Advantage	Main Disadvantage
SHF	Ability to complete each step under the best possible conditions	Cellulase and glucosidase enzymes are inhibited by glucose produced during hydrolysis
SSF	Lower enzyme requirements; higher product yields	SSF conditions are more difficult to optimize
SSCF	Reduced capital costs; higher ethanol productivity	Diverse assimilation rates of pentose and hexose, and expensive cellulase enzymes are required
CPB	One microbe produces all of the necessary enzymes, as well as sugars and ethanol	Conversion time is longer than for other processes

Table 4 summarizes the recent studies on bioethanol production that have focused on using agricultural residue and waste that are readily available in Bangladesh, where SSF, SHF, and SSCF techniques are used to produce bioethanol. S. cerevisiae was used as a biocatalyst for fermentation in nearly 84 percent of the studies cited. These processes for generating bioethanol from several LCBs are presently being designed to fulfill sustainability and fuel standards, and the demands of transport.

Table 4. Various operating methods for producing bioethanol from different lignocellulosic feedstocks.

Feedstock	Pretreatment/Hydrolysis	Microorganism	Modes	Ethanol Yield	Ref.
Rice straw	Alkali (NaOH)/ Accellerase^® 1500 enzyme	S. cerevisiae, Candida tropicalis	Batch SSCF	28.6 g/L	^[53]
Rice husk	0.1 M of FeCl₃, HCl, and NaOH in triplicates at 121 °C for 15 min/Trichoderma reesei ATCC 26,921 enzyme	S. cerevisiae	SSF	3.8%	^[54]
Sugar cane	Acid (H₂SO₄) followed by alkaline delignification (NaOH)/Trichoderma reesei	Recombinant S. cerevisiae containing the β-glucosidase gene	Batch SSF	51.7 g/L	^[55]
Corn stover	AFEX/mix enzyme (Ctec 2, Htec 2, and Multifect pectinase)	S. cerevisiae Y35	SHF	45.5 g/L	^[56]
White straw	2.15% (v/v) H₂O₂, 35 °C/T. longibrachiatum, A. niger, T. reesei	E. coli strain FBR5	SSF	66 g/L	^[57]
Jute stalks	Alkali (2% NaOH)/commercial cellulase and β-glucosidase enzymes	S. cerevisiae JRC6	SHF	7.55 g/L	^[7]
Tobacco	Alkali 2% (CaO)/liquid hydrolysates and β-glucosidase	S. cerevisiae	SHF	75.74 g/L	^[58]

3. Bioethanol Potential in Bangladesh

Bangladesh has vast potential for commercial bioethanol production. About 70.69% of the land is considered an agricultural area where many crops are produced. An enormous amount of residue is produced from the major crops that are readily available, such as rice, wheat, corn, sugarcane bagasse, pulses, and jute, from which a significant amount of bioethanol could be produced. Few theoretical studies on the feasibility of biofuel in Bangladesh have been conducted with a focus on bioethanol. Miskat et al. ^[52] conducted theoretical research on the accessibility of bioethanol production from agricultural residues. According to their estimates, the seven major crops (rice, jute, corn, wheat, sugarcane, cotton, and tobacco) produced approximately 65.36 million tons of crop residue, which could be converted into 32 million tons of bioethanol, with rice residues alone accounting for 27 million tons of that total. Mahmud et al. ^[59] researched the theoretical assessment of agricultural feedstock for biodiesel and bioethanol production. According to the findings, Bangladesh can produce approximately 44.4 million metric tons of bioethanol from five major crops (rice, jute, corn, wheat, and sugarcane) in the fiscal year 2019–2020, with rice accounting for 71% of the total. Here, researchers will examine how much organic ethanol can be produced from Bangladesh’s most available crop residues. These raw materials are rice, wheat, maize, jute, sugarcane, tobacco, pulses, and vegetable wastes. Many researchers report ethanol yields under various conditions, in different units and in different amounts. The ethanol yield (liters/ton) has been adapted from Tse et al. ^[60] in this paper for convenient calculation of the bioethanol potential from major agricultural residues. According to the findings, Bangladesh can produce 19.325 GL of bioethanol from crops in the fiscal year 2019–2020. Rice wastes are the most crucial contributor, from which about 14 GL of bioethanol can be produced; after rice, the most prominent contributors are jute and maize wastes. The potential for bioethanol production in gigalitres (GL) from significant agricultural residues in Bangladesh is shown in Table 5 ^[60]. In FY 2019–2020, BPC sold about 7 GL of petroleum-based oil equivalent to 5,488,668 MT, of which 62.69% was to the transport sector.

Table 5. Bioethanol potential from agricultural residues in 2019–2020.

Crop Residue	Residue Recovery (10⁵ tons)	Bioethanol Potential (Liters/ton) ^[60]	Bioethanol Production (GL)
Rice straw	217.15		9.03
Rice husk	97.73	416.00	4.07
Rice bran	28.57		1.19
Wheat straw	6.30	406.00	0.26
Corn stalks	28.11		1.32
Corn cob	6.13	470.00	0.29
Corn husk	12.05		0.57
Jute stalks	56.32	418.47 ^a	2.36
Pulses	2.65	108.21	0.03
Sugarcane bagasse	3.87	351.00	0.135
Tobacco	0.60	372.47	0.02
Vegetables and others	6.41	110.00 ^b	0.07
Total	465.87		19.325

^a,b bioethanol potential for jute stalks and vegetables were considered to be 418.47 and 110 L/ton, respectively.

Based on the result and favorable scenario, Bangladesh can easily reduce the fossil fuel crisis and cost and contribute on a large scale to the renewable energy mix. Additionally, it can quickly meet the target of 5% blending for transportation fuel.

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Islam Mohammed Mahbubul

Miah Himan

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Update Date: 28 Jun 2023

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