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餐厨垃圾与污泥两相中温厌氧消化试验研究 总被引:2,自引:0,他引:2
研究了混合比例和污泥停留时间对餐厨垃圾与污泥联合两相中温厌氧消化过程的影响。相较于餐厨垃圾与污泥TS比为1∶3的条件,TS比为1∶1时两相系统具有更好的产气效果、有机物去除效果和运行稳定性。随着SRT的延长,两相系统有机负荷逐步降低,产甲烷速率相应降低,单位体积进料产沼气量以及有机物去除率逐步提高。在餐厨垃圾与污泥TS比为1∶1的条件下,两相厌氧消化系统最佳SRT为25 d(产酸相和产甲烷相分别为5 d和20 d);此时,沼气中甲烷含量高达71%,产甲烷速率和甲烷产率分别为0.7 L/L·d和0.69 L/gVS去除,两相系统VS去除率达到64.7%。 相似文献
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为研究餐厨垃圾与不同固体废物厌氧共消化产气的效果,探究餐厨垃圾/污泥共消化最佳进料方式,采用自制的全混合厌氧反应器,通过产气量和甲烷含量综合评价餐厨垃圾与不同固废(鸡粪、猪粪、玉米秸秆、麦秆、稻杆和活性污泥)共消化系统在不同配比下产气的潜力;通过产气性能和消化液的pH值、VFAs质量浓度、氨氮质量浓度、碱度综合评价进料方式对餐厨垃圾/活性污泥共消化系统的影响。结果表明:餐厨垃圾与6种不同底物混合共消化系统的产气潜力分别是活性污泥(5∶5)>鸡粪(5∶5)>玉米杆(3∶7)>麦秆(3∶7)>猪粪(1∶9)>稻杆(5∶5);餐厨垃圾/活性污泥共消化系统连续式进料的各项指标均优于序批式进料,更适合厌氧发酵产沼气。 相似文献
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目前,厌氧发酵产戊酸受限于其产率低,且利用餐厨垃圾产戊酸的研究少有报道。水热预处理因其可以促进底物的溶出和水解,并且无需使用化学试剂及具有操作简单等优点而受到广泛的关注。本文研究了不同水热预处理温度下,分别接种酒曲和剩余污泥对餐厨垃圾厌氧发酵产戊酸的影响。结果表明:最佳水热预处理条件(180℃)下,戊酸产量分别可达16.19g COD/L (酒曲组)和18.55g COD/L (剩余污泥组),相比空白组提高了3.66倍和0.74倍,显著提高发酵产戊酸效率。通过代谢分析发现:水热预处理可提高丙酸的产量,为发酵产戊酸提供充足的底物;此外,水热预处理有效调控厌氧发酵底物醇酸比,削弱戊酸产庚酸的转换途径,实现了戊酸的积累。微生物群落分析发现:水热预处理可提高产戊酸功能菌巨球菌属(Megasphaera)和小类杆菌属(Dialister)的相对丰度,酒曲空白组无产戊酸功能菌的富集,水热预处理(180℃)后,Megasphaera和Dialister的相对丰度可达13.77%和2.26%;剩余污泥空白组Megasphaera的相对丰度为6.21%,水热预处理(180℃)后,Megasphaera的... 相似文献
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《水处理技术》2017,(2)
研究了经过电化学预处理后污泥性质的变化以及对后续厌氧消化工艺的改善,从产气效果、消化性能、脱水性能、污泥性质4个方面来体现电化学预处理的改善作用。结果表明,经过电化学预处理的厌氧消化工艺其污泥日产气量最大达到12.19 m L/g,远大于未经预处理的全程厌氧工艺。经过电化学预处理与厌氧消化耦合工艺后,污泥上清液中挥发性有机酸(VFA)含量、SCOD、碱度、p H都大于全程厌氧工艺,其中SCOD最大达到2 951 mg/L、VFA的质量浓度最大达到485.3 mg/L;25 d厌氧消化后,污泥经过耦合工艺处理后VSS去除率为42.13%,而全程厌氧工艺处理后VSS去除率只达到33.23%。因此,可以说明电化学预处理可以改善后续厌氧消化工艺。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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塔设备改造选型的分析 总被引:2,自引:0,他引:2
就当前扩产增容中塔设备设计和改造时板式塔和填料塔的选型问题加以分析。在评述目前国内常用的几种塔板和新型填料之后,着重介绍一种新型塔板(导向梯形浮阀塔板)和一种新型填料(波环填料——乾隆帕克)。 相似文献