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糖蜜是甘蔗制糖过程中的一种副产品,主要用作动物饲料添加剂与生物制品的发酵原料。利用糖蜜生产沼气不仅拓宽了糖蜜的利用范围,还可以延长蔗糖生产链,发展生物质能源。本研究利用内循环(IC)反应器,并在试验后期加入外循环泵,探究糖蜜厌氧发酵产沼气的可行性。研究结果表明,在常温条件下,水力停留时间为5 d,进水COD_(cr)为5 000~10 000 mg/L,单日COD去除率最高达到了88.00%,沼气日产量最高可达2.4 m~3,沼气中的甲烷含量最高达49.8%。结果表明,厌氧发酵糖蜜生产沼气可行,并具有产业化的潜力。 相似文献
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以稻壳为原料,采用批式中温(35℃±1℃)厌氧发酵工艺研究了稻壳厌氧发酵制备生物燃气的产气性能,在此基础上结合物质流分析方法分析了发酵过程中C、N元素的分布情况以及物质与能量的转化效率。研究结果表明稻壳厌氧发酵制备生物燃气过程的产气率和产CH4率分别为297.41和164.40 ml·(gVSRH)-1,平均CH4含量为55.28%;C元素流向分布:30.7%生物燃气,6.4%沼液,62.9%沼渣;N元素在剩余物中的流向分布:63.2%沼液,36.8%沼渣;稻壳厌氧发酵制备生物燃气的物质转化效率和能量转化效率分别为30.0%和33.7%。本研究为农业加工废弃物的资源管理和能源化利用提供了理论依据。 相似文献
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考察了甘蔗糖蜜替代昂贵葡萄糖作为碳源、乳清粉替代大部分酵母粉作为氮源时,对Actinobacillus succinogenes NJ113发酵制备丁二酸的影响。血清瓶厌氧发酵结果证明:对照组(葡萄糖40 g/L)的丁二酸产量仅为26.04 g/L,而以糖蜜为碳源(以总还原糖计算为40 g/L)时,丁二酸产量达到28.27 g/L,比对照组提高了8.57%。在此基础上,以糖蜜为碳源、不同比例的乳清粉和酵母粉为混合氮源发酵制备丁二酸,确定了糖蜜、乳清粉和酵母粉混合使用的最佳浓度分别为40 g/L、8 g/L和2 g/L。此外,在3 L发酵罐体系中添加40 g/L糖蜜、8 g/L乳清粉、2 g/L酵母粉进行发酵试验,实验结果证明:丁二酸终产量达到32.54 g/L,收率达到81.13%。 相似文献
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在试验中,对停止运行1个月的A/O生物滤池进行快速启动,对其脱氮效果及反冲洗进行研究.试验结果表明,滤池在水力负荷4 m/h下运行,回流比控制在1:1,好氧段曝气量均保持一级滤柱25 L/h.氨氮缺氧段需要12~13天,好氧段需要9~10天,总去除率可达90.5%.总氮去除率恢复缺氧段需要14~15天,好氧段需要9~10天,总去除率可达82.4%.反冲洗后3.5~4.5 h,系统运行即可恢复正常运行. 相似文献
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通过厌氧发酵链延长技术可以把废弃生物质转化为应用广泛、附加值高的己酸。在发酵体系中,产物的累积对产己酸过程会产生不利影响,通过添加生物炭材料可以缓解其抑制作用。探究了不同来源的生物炭材料对厌氧发酵链延长体系的促进效果,研究发现由不同原料(木屑、秸秆、桃核和竹子)热解制备的生物炭均能促进己酸的产生并且将此过程的滞后期缩短为原来的1/2。其中,木屑为原料的热解炭由于比表面积大、表面的功能性官能团数量多,对产己酸过程的促进效果最为明显,使己酸产量增加了44.65%,3种可能进行链延长的功能细菌的相对丰度增加了26.76%。 相似文献
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本研究对SS-CSTR(以淀粉糖浆为底物的CSTR系统)与BS-CSTR(以红糖为底物的CSTR系统)的启动进行了对比。采取由启动初期的较高OLR[18 kg/(m3·d)]降至较低OLR[9 kg/(m3·d)]的方式(污泥接种量分别为18.11 g VSS/L和18.04 g VSS/L,温度为35±1℃,HRT=6 h),SS-CSTR与BS-CSTR系统均可以实现在16 d左右启动。启动完成后,SS-CSTR与BS-CSTR系统的p H分别稳定在4.37和4.28左右。生物气产量分别达到3.00 L/d和4.52 L/d,其中氢气含量分别为74.60%和75.28%。SS-CSTR的COD去除率维持在8.30%左右,BS-CSTR的COD去除率保持在18%左右。经对比SS-CSTR系统与BS-CSTR(以红糖为底物的CSTR系统)系统的启动情况,可以得出以下结论:SS-CSTR系统的启动效果与BS-CSTR系统相比较差,SS-CSTR应对环境条件变化的调节能力逊于BS-CSTR系统。其原因是SS-CSTR系统中易于被微生物消化利用的糖分含量低于BS-CSTR系统。 相似文献
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一种新型反应器——生物气射流循环厌氧流化床的启动与运行特性 总被引:1,自引:0,他引:1
A novel anaerobic reactor, jet biogas inter-loop anaerobic fluidized bed (JBILAFB), was designed and constructed. The start-up and performance of the reactor was investigated in the process of artificial glucose waste-water treatment. With the wastewater recycle ratio of 2.5:1, the recycled wastewater with biogas could mix sludge and wastewater in the JBILAFB reactor completely. The start-up of the JBILAFB reactor could be completed in less than 70 d through maintenance of hydraulic retention time (HRT) and stepwise increase of feed total organic carbon (TOC) concentration. After the start-up, with the volumetric TOC loadings of 14.3 kg·m-3·d-1 the TOC removal ra-tio, the effluent pH, and the volatile fatty acids (VFA)/alkalinity of the JBILAFB reactor were more than 80%, close to 7.0 and less than 0.4, respectively. Moreover, CH4 was produced at more than 70% of the theoretical value. The reactor exhibited high stability under the condition of high volumetric TOC loading. Sludge granules in the JBI-LAFB reactor were developed during the start-up and their sizes were enlarged with the stepwise increase of volu-metric TOC loadings from 0.8 kg·m-3·d-1 to 14.3 kg·m-3·d-1. Granules, an offwhite color and a similar spherical shape, were mainly comprised of global-like bacteria. These had good methanogenic activity and settleability,which were formed probably through adhesion of the bacteria. Some inorganic metal compounds such as Fe, Ca,Mg, Al, etc. were advantageous to the formation of the granules. 相似文献
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为了提高养猪废水厌氧发酵的反应效率提高其产气量,分别在产酸相33℃,产甲烷相36℃考察浓度为10mg/L的铁、钴、镍以及三者的混合及搅拌静置两种条件对养猪废水厌氧发酵的影响,记录产气量、pH值变化以及COD值变化.发现同时添加三种微量元素对产酸相明显有抑制作用.但是同时加入产气速率最快,产气量提高了61.70%,累积产气量为158 mL.同时COD和NH3-N的去除率最大,分别是92%和94.4%.搅拌可以加速产酸相的反应,静置利于产甲烷相的产气. 相似文献
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A novel anaerobic reactor, jet biogas inter-loop anaerobic fluidized bed (JBILAFB), was designed and constructed. The start-up and performance of the reactor was investigated in the Process. of .artificial glucose wastewater treatment. With the wastewater recycle ratio of 2.5 : 1, the recycled wastewater with biogas could mix sludge and wastewater in the JBILAFB reactor completely. The start-up of the JBILAFB reactor could be completed in less than 70 d through maintenance of hydraulic retention time (HR~I") and stepwise increase of feed total organic carbon (TOC) concentration. After the start-up, with the volumetric TOC loadings of 14.3 kg·m ^-3·d^-1, the TOC removal ratio, the effluent pH, and the volatile fatty acids (VFA)/alkalinity of the JBILAFB reactor were more than 80%, close to 7.0 and less than 0.4, respectively. Moreover, CH4 was produced at more than 70% of the theoretical value, The reactor exhibited high stability under the condition of high volumetric TOC loading. Sludge granules in the JBILAFB reactor were developed during the start-up and their sizes were enlarged with the stepwise increase of volumetric TOC loadings from 0.8 kg.m^-3.d ^-1 to 14.3 kg.m^-3.d^-1. Granules, an offwhite color and a similar spherical shape, were mainly comprised of global-like bacteria. These had good methanogenic activity and settleability, which were formed probably through adhesion of the bacteria. Some inorganic metal compounds such as Fe, Ca, Mg, Al, etc. were advantageous to the formation of the granules. 相似文献
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研究了一株青霉菌P6 (Penicillium sp. P6)液体发酵产生木素过氧化物酶的工艺条件,考察了青霉菌P6在天然培养基稻米糠、玉米糠、麦糠和合成培养基GMY中的产酶情况,结果表明,麦糠是较理想的底物. 通过单因素方法研究了添加苯甲醇和MnSO4对酶活的影响;采用正交实验对MnSO4添加量、麦糠含量和培养基pH进行了研究,在实验范围内最佳酶活达到了2.69 U/mL. 进一步通过单双因素回归实验研究了麦糠和MnSO4的最佳含量,得到了最佳培养条件为孢子接种量1.1×106 mL-1,培养时间8 d,500 mL三角瓶装液量150 mL. 最佳培养基组成为麦糠50 g/L,初始pH 4.8, MnSO4 5.66 mmol/L. 相似文献
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钨酸铅光催化降解糖蜜酒精废水的研究 总被引:1,自引:1,他引:1
糖蜜酒精废水是一种难降解的有机废水,主要成分为焦糖等色素类物质.利用沉淀法制备了PbwoJ光催化剂,将其应用于光催化降解糖蜜酒精废水降解反应中,考察了催化剂用量,空气流量,溶液pH值,助氧化剂及光照强度对糖蜜酒精废水脱色率的影响.研究表明,在紫外光辐照下,PbW04能有效地对糖蜜酒精废水进行光催化作用,过程为一级动力学反应.对于经30倍稀释的糖蜜酒精废水,添加4.0 g·L1的PbW04光催化剂,通入126 L.h1的空气,不改变废水的pH值及不添加助氧化剂H2O2的条件下,在300W高压汞灯照射下反应120 min,PbWO4光催化降解糖蜜酒精废水的脱色率为90.2%,COD去除率为78.6%,得到了较好的降解. 相似文献
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