本文選題：纖維乙醇廢水 + 正交實(shí)驗(yàn)　； 參考：《南陽(yáng)師范學(xué)院》2017年碩士論文

【摘要】：能源問(wèn)題是可持續(xù)發(fā)展中的一個(gè)重要主題。隨著經(jīng)濟(jì)的不斷發(fā)展,能源短缺和環(huán)境污染問(wèn)題日益突出。纖維乙醇的研發(fā)已成為當(dāng)前各國(guó)新資源戰(zhàn)略的重點(diǎn),我國(guó)也在大力發(fā)展非糧乙醇。河南天冠企業(yè)集團(tuán)有限公司目前已完成了萬(wàn)噸秸稈乙醇科技攻關(guān),并已運(yùn)行3萬(wàn)噸秸稈乙醇項(xiàng)目。但在生產(chǎn)中實(shí)現(xiàn)原料多級(jí)利用,提高經(jīng)濟(jì)效率,需要對(duì)后期的纖維乙醇廢水做深度開(kāi)發(fā)利用。河南天冠集團(tuán)對(duì)傳統(tǒng)乙醇生產(chǎn)廢物利用技術(shù)已成熟,但在工業(yè)化進(jìn)程中還需技術(shù)不斷創(chuàng)新。通過(guò)對(duì)纖維乙醇廢水沼氣利用中發(fā)酵液回流循環(huán)技術(shù)、纖維乙醇廢水固態(tài)發(fā)酵產(chǎn)沼氣工藝等關(guān)鍵技術(shù)的研究,實(shí)現(xiàn)秸稈原料生物乙醇-沼氣二級(jí)能源梯度生產(chǎn),提高原料能源轉(zhuǎn)化率,為發(fā)展綠色循環(huán)經(jīng)濟(jì)提供技術(shù)支撐。通過(guò)單因素梯度預(yù)實(shí)驗(yàn)優(yōu)化了纖維乙醇廢水沼氣發(fā)酵的條件為菌液含量20%,TS 12%,氮源含量(氮源總固體占發(fā)酵體系總固體的百分?jǐn)?shù))12%牛糞或10%豬糞。正交實(shí)驗(yàn)在預(yù)實(shí)驗(yàn)的基礎(chǔ)上進(jìn)行設(shè)計(jì)對(duì)預(yù)實(shí)驗(yàn)的結(jié)果進(jìn)行驗(yàn)證改進(jìn),以廢水固液分離的廢液為原料的正交實(shí)驗(yàn)結(jié)果為菌液含量20%,裝罐率90%,總固體12%,氮源為10%牛糞；在此發(fā)酵條件下,產(chǎn)氣量15.37 L,容積產(chǎn)氣率6.83 L/L,物料利用率44.1%。以廢水固液分離的固廢為原料的正交實(shí)驗(yàn)結(jié)果顯示,菌液含量30%,裝罐率90%,總固體12%,氮源10%牛糞；在此發(fā)酵條件下,產(chǎn)氣量,產(chǎn)氣量15.085 L,容積產(chǎn)氣率為6.7 L/L,物料利用率為45.9%。以廢水為原料的正交實(shí)驗(yàn)結(jié)果顯示菌液20%,裝罐率90%,總固體12%,氮源4%牛糞。在此發(fā)酵條件下產(chǎn)氣量,產(chǎn)氣量31.577 L,容積產(chǎn)氣率14.03 L/L,物料利用率49.5%。中試發(fā)酵是對(duì)工業(yè)生產(chǎn)的模擬,是將實(shí)驗(yàn)室成果轉(zhuǎn)化為工業(yè)生產(chǎn)的中間環(huán)節(jié)。在正交實(shí)驗(yàn)中通過(guò)對(duì)三組實(shí)驗(yàn)結(jié)果的計(jì)算分析得出最佳產(chǎn)氣條件為pH 7.5,20%菌液含量,90%裝罐率,12% TS,4%氮源。在優(yōu)化的發(fā)酵參數(shù)條件下,自制厭氧發(fā)酵裝置,進(jìn)行了機(jī)械+回流混合攪拌(MRMS)與機(jī)械攪拌(MS)進(jìn)行發(fā)酵工藝比較。采用機(jī)械+回流混合攪拌工藝產(chǎn)氣率高,容積產(chǎn)氣率比機(jī)械攪拌工藝增加41.2%,物料利用率提高13%,COD去除率降低10.3%,TN去除率提高9.1%。
[Abstract]:Energy is an important theme in sustainable development. With the development of economy, energy shortage and environmental pollution are becoming more and more serious. The research and development of cellulosic ethanol has become the focus of the new resource strategy in various countries, and China is also vigorously developing non-grain ethanol. Henan Tianguan Enterprise Group Co., Ltd. has completed the scientific and technological research of ten thousand tons of straw ethanol, and has run 30,000 tons of straw ethanol project. But in order to realize multilevel utilization of raw materials and improve economic efficiency, it is necessary to develop and utilize the fiber ethanol wastewater in the later stage. The waste utilization technology of traditional ethanol production in Henan Tianguan Group is mature, but the technology innovation is needed in the process of industrialization. Through the research on the key technologies, such as fermentation broth recirculation technology in the utilization of fiber ethanol wastewater and solid-state fermentation of fiber ethanol wastewater to produce biogas, the two-stage energy gradient production of straw raw material bio-ethanol and biogas was realized. To improve the conversion rate of raw material energy to provide technical support for the development of green recycling economy. The biogas fermentation conditions of cellulosic ethanol wastewater were optimized by single factor gradient pre-experiment. The results showed that the fermentation conditions were as follows: microbial liquid content 20% TS 12% nitrogen source content (total solid of nitrogen source:% of total solid in fermentation system) 12% cow dung or 10% pig dung. On the basis of the pre-experiment, the orthogonal experiment was designed to verify and improve the results of the pre-experiment. The orthogonal experiment using the waste liquid separated from waste water as the raw material was as follows: the content of bacteria liquid 20%, the tank filling rate 90%, the total solid 12%, the nitrogen source 10% cow dung; Under these fermentation conditions, the gas yield was 15.37 L, the volumetric gas yield was 6.83 L / L, and the material utilization ratio was 44.1%. The orthogonal experiment using solid waste separated from waste water as raw material showed that the content of bacterial liquid was 30, the filling rate was 90, the total solid was 12, and the nitrogen source was 10% cow dung, under this fermentation condition, the gas production, gas production, volumetric gas production were 15.085 L, volumetric gas production rate was 6.7 L / L, and the material utilization ratio was 45.9%. The results of orthogonal experiment using wastewater as raw material showed that 20% of bacteria liquid, 90% of tank filling rate, 12% of total solid, 4% of cow dung from nitrogen source. Under this fermentation condition, gas production, gas production, volume gas yield and material utilization ratio were 31.577 L / L, 14.03 L / L and 49.5 L, respectively. Pilot-scale fermentation is the simulation of industrial production and the intermediate link of converting laboratory results into industrial production. Through the calculation and analysis of the results of three groups of experiments in the orthogonal experiment, the optimum conditions for gas production were found to be pH 7.5% 20% bacterial liquid content 90% tank filling rate and 12% TSN 4% nitrogen source. Under the optimized fermentation parameters, the fermentation process was compared between the mechanical reflux mixing agitation (MRMS) and the mechanical stirring (MSM) in a self-made anaerobic fermentation device. By using mechanical reflux mixing mixing process, the gas production rate is high, the volume gas production rate is 41.2% higher than that of the mechanical mixing process, the material utilization ratio is increased by 13% COD removal rate and the removal rate of TN is decreased by 10.3% and the TN removal rate is increased by 9.1%.
【學(xué)位授予單位】：南陽(yáng)師范學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：S216.4

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