Experimental Research of Batch Co-Anaerobic Fermentation under Constant Temperature of Mixed Biomass
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1 Sensors & ransducers, Vol. 1, Issue 3, March 214, pp Sensors & ransducers 214 by IFSA Publishing, S. L. Experimental Research of Batch Co-Anaerobic Fermentation under Constant emperature of Mixed Biomass Dandan Zhou, Jinping Li, Fengyu Yang, Chunlong Wang Lanzhou University of echnology, Lanzhou 3, China el.: zhoudandan124@13.com Received: 21 March 214 /Accepted: 3 March 214 /Published: 31 March 214 Abstract: o study the influence of batch anaerobic fermentation under constant temperature of mixed biomass (cow dung and wheat straw) and make sure the optimum mixing ratio, the experiment which mixed cow dung and wheat straw in batch anaerobic fermentation was under CO2. Contrastive analysis the experimental results which shows that the single material of cow dung was superior to the other three groups in the incipient stage, however, co-digestion was just a way which have a cost effective and environmental protection, and needed a reasonable co-digestion ratio of cow dung and wheat straw could increase the biogas production rate and utilization of crop straw. hese experimental results were great of instruction for mixed materials anaerobic fermentation under the thermostatic condition. Copyright 214 IFSA Publishing, S. L. Keywords: Mixed biomass, hermostatic anaerobic fermentation, Accumulative gas production, C/N ratio, Biogas composition. 1. Introduction As the development of rural urbanization in China and the improvement of farmers, a large number of manure, straw, fruit and vegetable waste, sewage are abandoned that serious polluted the rural living environment. Pollution-free disposal become one of the key problems of rural urbanization in China which need to be solved urgently. Co-digestion is a highly promising, and environmentally friendly technology for the beneficial use of organic waste. It offers a very attractive route to utilize certain categories of biomass for meeting partial energy needs. In fact, proper functioning of biogas systems can provide multiple benefits for treating organic waste, such as generating biogas as renewable energy, reducing greenhouse gas emissions, and producing organic fertilizer to the users and the community resulting in resource conservation and environmental protection, play a very important role in China s rural areas where the energy demand is rapid rise in recently years. Wheat straw is the residual structure of the plant after grain harvesting, which is mainly composed of cellulose, has the lower efficiency of biogas production because the C/N is lower [1]. Adjusting the ratio of C/N can effectively improve the biogas production rate of straw. Literature review has indicated that the combine of wheat straw and the animal manure increase the biogas yield [2]. As it has the positive synergisms established in the digestion medium and improve the biogas process through (1) supplementing nutrients to increase in the organic content inside the digester, eliciting better utilization Article number P_RP_9 19
2 Sensors & ransducers, Vol. 1, Issue 3, March 214, pp of the digester volume; (2) balancing the C/N ratio to 2-3; (3) diluting inhibitory and/or toxic compounds to enhancement of the digestate stabilization; (4) establishing the required moisture content, with an easier handling of blended wastes; () improving the handling of mixed waste streams; () economic advantages from the sharing of equipment and costs; () stabilizing the ph via an increased buffer capacity; and () large reduction of the emission of greenhouse gases into the atmosphere [3-9]. In this work, the utilization of cow dung and wheat straw s mixtures for biogas production and the effects of cow dung and wheat straw ratio were investigated with using anaerobic batch digestion test. he co-digestion process and the synergetic effects in different mixture ratio were further investigated by determining methane yield. 2. Materials and Methods 2.1. Collection of Substrates and Inoculums Wheat straw was collected from the farmers in the near of Lanzhou, Gansu, China. After shredding to paste shape was less than. cm, was stored at 4 C. Cow dung was obtains from the cattle farm in Huazhuang. he characteristics of food waste and head cabbages are shown in able 1. able 1. Characteristics of typical wheat straw (WS) and cow dung (CD) from a northern China city. S (%) VS (%) WS CD As the Fig. 1, the temperature of fermentor is controlled by heating water. he temperature of the fermentor which has good heat preservation is controlled by 3 ± 1 C. he last fermentor keeps consistent with the environment temperature. Use the BioGas Check to determination of gas component, as methane and carbon dioxide measurement accuracy are ± 3. %, hydrogen sulfide measurement range is - ppm, measurement accuracy is ± 2 ppm. Gas production is measured by wet test meter that accuracy is ± 1 % M M M emperature-controlling, 2. Insulating layer, C fermentor,. Data collecting instrument,. Wet test meter, 9. Computer Biogas Check, 11. Water collecting bottle, 12. Biogas collecting bottle, 13. Inside water tank, 14. Electrmagenetism valve, 1. Hot water pump, 1. hermostatic water tank, kw heater, 1. emperature sensor. Fig. 1. Schematic diagram of controllable constant-temperature fermenting equipment. Anaerobic batch digestion tests were carried out in triplicates under mesophilic conditions (3 C). he mesophilic inoculum (3 C) was obtains from a large digestor which treating dairy cattle processing wastewater in Hua-zhuang (the plastic bucket inoculum was sealed transport). he S and VS content were 4.23 % and 1.1 %, respectively. Each reactor with L capacities contained 2.4L of inoculum. he compositions in different batch setups are summarized in able 1. he total solid of the initial concentrations for inoculum and raw wastes was %. he tests had been operated for 4 days at (3 ± 1) C. he digester was equipped with inlet and outlet ports for feeding and effluent discharging, and a port for gas collection. est mixture ratios of CD: WS based on mass were 3:, 1:1 and :3. 3. Results and Discussion 3.1. Effect of Mixed Ratio on ph of the Anaerobic Fermentation he PH value (or acid-base balance) is the result of the combined effects which contain the dissolved balance of CO 2, H 2 S in the gas-liquid two-phase; the acid-base balance in the liquid phase; and the ion dissolved balance between liquid and solid phase in 19
3 Sensors & ransducers, Vol. 1, Issue 3, March 214, pp the system. And this balance has related to biochemical reactions within the reactor. herefore, to study the nature of the acid-base balance in the anaerobic digestion process is very important. As the Fig. 2 shown, the curves trend is similarity in different mixed ratio, ph is significantly lower in the initial stage of the anaerobic fermentation, that is, this state is the acidification stage of fermentation. As the increase of cow dung ratio, the shorter of acidification stage. Braun also reported a mean value of 14 days HR in the mono-digestion of energy crops and days when equal amounts of crops and manure are co-digested. ph is the m1 :m2=3: is the m1 :m2=1:1 is the m1 :m2=:3 is the m1 :m2=1: the following is the same Fig. 2. he effect of different mixing ratio on ph 1 is the quality of the cow dung, m2 is the quality of wheat straw Effect of Mixed Ratio on Biogas Production of the Anaerobic Fermentation When straw is the only fermentation material, the fermentation process is instability because the material has too high ratio of C/N (22, 23), low nutrients content, and weak buffering capacity [13] which restricted the use in AD. Currently there are two ways in the study of the problems to solve the straw in the fermentation process. One is to increase mineral nutrition, improve the ability of degradation and methane production [1]. Such as Nges [11] added trace element into the energy crops such as sugar beet and corn and black wheat. From the economic consideration is not appropriate as this way leads to the increase of the cost in the operation. Another way is co-digestion by adding the complementary matrix. Animal waste has strong buffering capacity by high nitrogen content which often co-digestion with high carbon materials such as straw [12]. From the Fig. 3, 4, the biogas production rate of the only cow dung is higher than the mixed fermentation at the beginning of the fermentation, showing that co-anaerobic fermentation rate in startup phase does not improve compare with the easy degradation matrix, it is a compatible manner of costeffective and environmental protection. he trend of the curves is the same. Biogas production has two peaks, although some are not obvious. he biogas has lower methane content in first days due to the remaining part of the air in the reactor, which to make the aerobic micro-organism metabolism produced large amounts of carbon dioxide. It is obvious that the reactor in gas production peak time is different. he time that reach peck production rate is 13, 14, 22 and 1d. he cumulative gas production was 193.1L under the mixing ratio is m1:m2=:3 which more.4 %, 42.1 % and.9 % than the m1:m2=1:,3:, 1:1 respectively, as the cumulative gas production is 11.3, 13.4, respectively. he gas production with the whole phase was showed a trend that first increased then decreased while were fluctuated in the intermediate phase. With the consumption of organic matter and the accumulation of harmful material, biogas production rate is slow decline, until the rate is zero. biogas production(l) cumulative biogas production(l) Fig. 3. he change of biogas production Fig. 4. he change of cumulative biogas production with time Analysis of Biogas Composition Biogas, a clean and renewable form of energy, could very well be a substitute for conventional 191
4 Sensors & ransducers, Vol. 1, Issue 3, March 214, pp sources of energy [13]. he most important biogas components are methane, carbon dioxide, and sulfuric components [13]. he gas is generally composed of methane ( %), carbon dioxide (3 4 %), nitrogen ( 3 %), hydrogen ( 1 %), and hydrogen sulfide ( 1 %) [14]. As we knew, the heating value of 1 kg of methane (. MJ kg -1 ) is equivalent to 1.2 kg of diesel or 3. kg of wood [1, 1]. hat was the reason why anaerobic digestion technology attracting more and more attention after the Second World War. he methane content was increasing rapidly after the acidogenesis phase (Fig. ) until it reached its peak and kept a period of time expect of the 3:. During this period is also producing biogas effective period, the methane content can reach % under different mixing ratio, and then gradually decline until the experiment is over. Methane content (%) Fig.. he change of methane content in biogas. From the Fig., CO 2 content was declined with the time changing. he reason for this might be the producing hydrogen methanogens which utilizing the CO 2 to form methane when the reactor environment is stable. CO2 content (%) Fig.. he change of CO2 content in biogas. Fig. shown H2S content is sharp increased more than ppm at the initial stage because the sulfatereducing bacteria can use a wider range of matrix, and has more widely environmental conditions than methane-producing bacteria such as temperature, oxidation reduction potential. H2S content (ppm) Fig. he change of H2S content in biogas with time. he reactor with the mixing ratio is m 1 :m 2 =:3,1:1 and 3: remains at a high values from 2 days to 1 days, rapidly reduce after 1 days in ppm while the reactor with m 1 :m 2 =1: remain 2 ppm after 11 days. With the extension of fermentation time, the change trend of decline, as the methane bacteria metabolism, methane content increase lead to hydrogen sulfide begin to decline. 4. Conclusions 1) he biogas production rate of the only cow dung is higher than the mixed fermentation at the beginning of the fermentation, showing that coanaerobic fermentation rate in start-up phase does not improve compare with the easy degradation matrix, it is a compatible manner of cost-effective and environmental protection. 2) he cumulative gas production was 193.1L under the mixing ratio is m1:m2=:3 which more.4 %, 42.1 % and.9 % than the m1:m2=1:,3:, 1:1 respectively,an s the cumulative gas production is 11.3, 13.4, respectively. Acknowledgements his work has been supported by the National Hightech R&D Program of China (3 Program) (213AA11) and National Natural Science Foundation of China (139). References [1]. Chu Lili, Li Yibing, Feng Yongzhong, Characteristics of Co-digestion of Pig Dung and Wheat Straw in Various Ratios, ransactions of the Chinese Society for Agricultural Machinery, Vol. 42, Issue 4, 211, pp [2]. Wu Xiao, Yao Wanying, Zhu Jun, Biogas and CH4 productivity by co-digesting swine manure with three crop residues as an external carbon source. 192
5 Sensors & ransducers, Vol. 1, Issue 3, March 214, pp [3]. [4]. []. []. []. []. [9]. Bioresource echnology, Issue 11, 21, pp J. Mata-Alvarez, S. Macé, P. Llabrés, Anaerobic digestion of organic solid wastes. An overview of research achievements and perspectives, Bioresoure echnology, Vol. 4, Issue 1, 2, pp F. A. Mondragon, P. Samar, Huub H. J. Cox, Anaerobic Codigestion of Municipal, Farm, and Industrial Organic Wastes: A Survey of Recent Literature, Water Environment Research, Vol., Issue, 2, pp. -3. X. Gómez, M. J. Cuetos, J. Cara, Anaerobic codigestion of primary sludge and the fruit and vegetable fraction of the municipal solid wastes: conditions for mixing and evaluation of the organic loading rate, Renewable Energy, Vol. 31, Issue 12, 2, pp Bo Fu, Jingjing Zhang, Jinfeng Fan, Control of C/N ratio for butyric acid production from textile wastewater sludge by anaerobic digestion, Water Science echnology, Vol., Issue, 212, pp Bond, C. J. Brouckaert, K. M. Foxon, A critical review of experimental and predicted methane generation from anaerobic codigestion, Water Science echnology, Vol., Issue 1, 212, pp I. A. Nges, F. Escobar, X. M. Fu, Benefits of supplementing an industrial waste anaerobic digester with energy crops for increased biogas production, Waste Management, Vol. 32, Issue 1, 212, pp Li-Hong Wang, Qunhui Wang, Weiwei Cai, Influence of mixing proportion on the solid-state anaerobic codigestion of distiller's grains and food waste, [1]. [11]. [12]. [13]. [14]. [1]. [1]. Biosystems Engineering, Vol. 112, Issue 2, 212, pp Demirel B., Scherer P., Yenigun O., Production of methane and hydrogen from biomass through conventional and high-rate anaerobic digestion processes, Critical Reviews in Environmental Science and echnology, Vol. 4, Issue 2, 21, pp Demirel B., Scherer P., race element requirements of agricultural biogas digesters during biological conversion of renewable biomass to methane, Biomass Bioenergy, Vol. 3, Issue 3, 211, pp Ivo Achu Nges, Lovisa Björnsson, High methane yields and stable operation during anaerobic digestion of nutrient-supplemented energy crop mixtures, Biomass and Bioenergy, Issue 4, 212, pp. 2-. Santosh, Y., Sreekrishnan,. R., Kohli, S., Enhancement of biogas production from solid substrates using different techniques-a review, Bioresource echnology, Vol. 9, Issue 2, 24, pp M Balat, H Balat, Biogas as a Renewable Energy Source - A Review, Energy Sources, Vol. 31, Issue 4, 29, pp Fountoulakis, M. S., Manios,., Enhanced methane and hydrogen production from municipal solid waste and agro-industrial by-products co-digested with crude glycerol, Bioresource echnology, Vol. 1, Issue 12, 29, pp Phalakornkule, Anaerobic digestion of glycerol and co-digestion of glycerol and pig manure, Journal of Environmental Management, Issue 11, 212, pp Copyright, International Frequency Sensor Association (IFSA) Publishing, S. L. All rights reserved. ( 193
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