Anaerobic Treatment of Vinasse from Sugarcane Ethanol Production in Expanded Granular Sludge Bed Bioreactor (original) (raw)
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Optimization of Anaerobic Digestion of Vinasse for the Production of Biogas
2017
The increase in energy price and environmental concerns focused attention on the need for industrial process improvement and development of alternative energy sources such as ethanol fuel. Ethiopia, in its GTP 2, has planned to produce 320,268 m 3 of ethanol leaving around 3.8 million m 3 of vinasse as a by-product.,having very high biological oxygen demand (BOD), chemical oxygen demand (COD), and other pollutant properties which necessitate distillery plants to deal with its treatment and reuse. The purpose of this thesis work was to optimize the anaerobic treatment vinasse for substantial decrease of its BOD and COD while producing methane gas and to evaluate potential of vinasse as an alternative source of energy. Vinasse sample was taken from Metehara sugar factory distillery plant. The combined effect of temperature and pH on biogas production and reduction of organic load such as COD, BOD and VS was studied in this work. Accordingly, vinasse samples that were treated at temperature of 35 o C and initial pH of 7.25 for hydraulic retention time of 20 days on anaerobic digestion system has produced 34.68 ml of CH4/g COD while COD, BOD and VS concentration were reduced by 64, 76 and 52.77 % respectively. The Composition of biogas was 81 % CH 4 , 14 % CO 2 , 2 % O 2 , 3 % other and 1 PPM H 2 S. The minimum amount of biogas production (21.05 ml of CH4/g COD) and low removal efficiency of COD, BOD and VS (30.8, 45, and 25.4 % respectively) were observed at samples treated with temperature of 30 o C and pH of 6.5. From the design of UASB reactor, the expected amount of energy generated from anaerobic digestion of vinasse of Metehara sugar factory distillery plant is 1.99 x 10 8 KJ/day, which is equivalent to 10850 KWH.. It was noted that vinasse is a suitable feedstock for anaerobic digestion and can be a good source of alternative green energy and protect the environment from pollution.
2021
This study was aimed at studying the potential of biogas (methane) production from vinasse wastewater in real full-scale application using a two-stage sequencing Up-flow High Rate Anaerobic Reactor (UHRAR), with effluent recirculation and substrate modification. A batch experiment was initially conducted prior to the full-scale application experiment. The batch experiment was done with experimental condition variable: undiluted sample (pH 6) and diluted samples (pH: 5; 6 and 7), while pH and methane production were observed for 50 days. Full-scale application was carried out in two-stage UHRAR reactors with volume 60 m3, HRT 40 d and OLR 60.1–104 kg COD/m3·d. The observation lasted for 32 d. The result from the batch experiment showed that the diluted samples achieved higher COD degradation and methane generation than the undiluted sample. The optimum condition occurred at pH 7, with theoretical methane yield of 7.5–10.64 L CH4 per kg COD. In turn, in full scale application, at day ...
The biogas production from mesophilic anaerobic digestion of vinasse
Vinasse is a mixture of water, organic and inorganic compounds. This liquid residue after distillation of the alcohol, present a surcharge for the industry distillers, views its high pollution load, which can contaminate water and soil, causing a big environmental problem. The treatment by anaerobic digestion can be used to reduce the pollution of this type of waste, while producing biogas, which is a renewable energy. The objective of this study is to determination of the potential of biogas from the anaerobic digestion of vinasse in Morocco, and keeping the stability of physic-chemical parameters in the environment. The experiment test were realized in laboratory scale using the mesophilic digester at 35°C and with 0.5L capacity, and using as raw material the vinasse from the process of the production of ethyl alcohol. The results obtained in this study indicate that the anaerobic digestion under mesophilic conditions, presents a reliable solution for production of biogas by treatment of this type of waste, this is proved by the increase in the volume of biogas collected which could reach 370mL of biogas for a load of 0.5g VS added, with a yield coefficient in biogas 0.7L/g VS.
Anaerobic biodigestion of sugarcane vinasse under mesophilic conditions using manure as inoculum
Sugarcane vinasse is one of the most polluting residues produced by Brazilian ethanol industries, mainly because of its harmful effects on the environmental, such as high organic matter load and acidity. Anaerobic digestion is a highly efficient wastewater treatment method that could potentially be used to treat sugarcane vinasse. This study examined the anaerobic biodigestion of sugarcane vinasse in mesophilic conditions (30-45°C) by varying the inoculum concentration (0.5 to 5.5%) and pH (6-8). Changes of Chemical Oxygen Demand (COD), total solids content, and yield and composition of biogas after the biodigestion of the vinasse were assessed. The vinasse was efficiently digested under mesophilic anaerobic conditions over a 23-day Hydraulic Retention Time (HRT) and a 5-day acidogenic phase with a consequent reduction of COD (54-83%) and total solids (52-87%). Statistical analyses at a confidence level of 95% suggested that temperature, pH and inoculum concentration did not influence on the anaerobic biodigestion of the vinasse. The optimal operating parameters were found to be temperatures of 30-35°C, inoculum concentration of 0.5% and pH of 6-7. The results emphasize the promising use of the treated sugarcane vinasse as a biofertilizer for agriculture, indicating that the anaerobic digestion process is an excellent alternative for Brazilian ethanol industries.
Bioenergy Potential Based on Vinasse From Ethanol Industrial Waste to Green Energy Sustainability
E3S Web of Conferences
The waste water from alcohol industry is called vinasse has a high organic content, with BOD5 = 109.038 mg / l, COD = 353.797 mg / l and TSS = 7200 mg / l, pH 4-5 with a temperature of around 40-50ºC. The current treatment of alcohol waste water, most still using facultative anaerobic technology with open ponds that are only covered with HDPE plastics. This technology produces less optimal biogas and has a weakness that is the hydraulic residence time (HRT) for long (40-50 days), wide land needs, low COD reduction efficiency as well as high risk of fire and leakage of biogas release high to trigger the occurrence of greenhouse gas and global warming effects. Development of technology with innovation reactor integration model Fixed Dome-Hybrid Anaerobic Filter aims to expand the contact area between the substrate and microbial with modification of the substrate flow system and the area of the filter and integrate with the gas accumulator. The design of this Fixed Dome-Hybrid Anaerobi...
Kinetic study of biogas production from anaerobic digestion of vinasse waste
Water Practice & Technology, 2021
Vinasse, a sugar-ethanol residue, is used as a substrate for biogas production. The characteristics of the vinasse wastewater used were 216,000 mg-COD/L, pH 4.1, and 68.42 mg/L volatile solids. The sludge/wastewater ratio was controlled at about 1.5À2.0, by weight. Biogas production enhancement was studied in relation to two parameters-Citadel BioCat þ , a commercial biocatalyst containing a large microorganism population as the methanogenic bacteria source (5 and 10 g), and reaction temparature (30 and 37°C). Biogas production kinetics were evaluated. The presence of the biocatalyst enhanced biogas production significantly, as well as reducing the time required for anaerobic digestion. The first-order kinetic model described the biodegradation process. The best results were found using 10 g of biocatalyst at 37°Ci.e., the optimum results based on biogas production potential (A), the highest biogas production rate (U), the minimum biogas production time (λ), and kinetic organic biodegradability constants (k) of 102.71 mL/g-COD, 11.17 mL/g-COD/d, 0.95 day, and 0.0533 day À1 , respectively. COD removal efficiency was up to 60%.
ANAEROBIC DIGESTION OF VINASSE FOR THE PRODUCTION OF METHANE IN THE SUGAR CANE DISTILLERY
The expansion and diversification of new alternative energy sources in a sustainable and efficient way figures strongly among the major concerns of the industrialized world. Recent energy supply crunches and price spikes have propelled ethanol as an alternative transportation fuel. Ethanol derived from renewable sources has brought a host of challenges along with opportunities to the sugar industry. Providing cost effective systems for the treatment, conservation and recycling of water and energy resources is definitively one of these challenges. Vinasse, the liquid residue left in the distillation of ethanol from sugar cane derivates, frequently pose serious disposal challenges as evidenced by its high biochemical oxygen demand (BOD). On an average basis, 12 cu ft of vinasse per cu ft of ethanol are produced in the distillery, with a BOD load ranging from 1.06 to 3.12 lb/cu ft of vinasse (17,000 to 50,000 mg/l). A study was carried out to assess the anaerobic digestion of vinasse for the production of methane. The purpose of this study was to gather enough data for subsequent evaluation of the technical feasibility of the process. The anaerobic digestion featured a complete mix reactor (digester) utilizing a two steps acid and methane-producing bacteria (thermophilic). Calculations data included temperature of 40ºC (104ºF) and mean cell residence time of 10 days.
Evaluation of Biogas Productivity from the Mixtures of Vinasse, Wastewater and Filter Mud
This study was conducted in R&D department, Kenana Sugar Company, Sudan on June 2014 and January 2015, to treat the sugar and alcohol industry waste as a source of biomass converted into alternative renewable energy as a biogas from the mixing of Vinasse, wastewater and filter mud using anaerobic digestion process and rumen fluids as inoculum starter for 28 working days at room temperature. Experiments were carried out to find optimum condition and parameters of biogas production process, Substrates (Vinasse: filter mud: wastewater) were mixed into three different ratios A (1:3:1), B (2:2:1), C (3:1:1) experiments were conducted in summer and winter. In summer (A, TS=12.07a, COD=89.10a, Biogas yield=1718.3ml/l, B, TS=8.96ab, COD=55.30a, Biogas yield=1751.7ml/l, C, TS=5.9, COD=82.3, Biogas yield=2470ml/l). C had the highest biogas production and COD removal rate in summer. In winter (A, TS=13.16b, COD=119.66a, Biogas yield=2514.7ml/l, B, TS=15.96a, COD=18.28b, Biogas yield=2335.0ml/l, C, TS=10.3, COD=72, Biogas yield=2265ml/l). A had the highest biogas production and COD removal rate in winter. So the average of biogas yields in summer 1777ml/l, 2371ml/l in winter, both 2070 ml/l yield/year. That means 3752*106 m3/year of waste produce 7766*105 m3/year of biogas that equal 4660*105 kWh, also reduce odor, organic load, produce better fertilizer, minimize waste treating cost, power saving and less polluting. Results showed not significant different in biogas production and COD removal rate in summer and winter. Study concluded that utilization of mixed biomass derived from sugar industry byproducts and wastewater for biogas production is applicable and feasible.
Eksergi
First-generation biofuel is environmental quandary due to its impact to the forest conversion into plantation area. Not only environmental sector, first-generation biofuel has other issues on socioeconomic sector. It consumes crops as its feedstock which will be a conflict between food and energy source. This conflict will impact the vulnerable people as the raising food price. Molasses-based bioethanol is second-generation biofuel which more beneficial from environmental, economic, and social aspect. Molasses-based bioethanol production process generates waste named vinasse. Vinasse can’t be directly discharged to the environment due to its high organic matter concentration which is harmful to the waterbody, soil, and air. On the other hand, high organic matter contained in vinasse can be converted into biogas and is higher potential for molasses-based bioethanol plant. This study was preliminary study for processing vinasse using thermophilic anaerobic digestion specifically by te...
2020
This study aimed to produce biohydrogen from sugarcane vinasse in an anaerobic fluidized bed reactor operated at ambient temperature (26-35 °C) with a progressive increase of the organic load rate (OLR) (17-155 kg-COD m-3 d-1) and without influent pH control. Hydraulic retention times (HRT) of 12, 6 and 4 h were applied to increase the OLR. The highest hydrogen yield, hydrogen production rate and percentage of hydrogen in the biogas were obtained in the HRT of 4 h, corresponding to the values of 2.40 mol-H2 mol-1-carbohydrate, 0.33 L-H2 h-1 L-1-reactor, and 33%, respectively. The butyric acid fermentative route was favored in the process. The PCR/DGGE analysis showed that the microbial community structure was modified along operational stages and increasing OLR caused an increase in microbial diversity. The results indicate that biohydrogen production from anaerobic digestion of sugarcane vinasse can be achieved with no alkalization pretreatment.