【作者】 伏苓；

【导师】 方晞；

【作者基本信息】 长安大学 ， 环境工程， 2005， 硕士

【摘要】 随着我国经济建设的飞速发展,各地都在加强城市排水和污水处理设施的建设,而更多城市污水处理厂建成投产后必然产生大量含水量很高的污泥。这些未经处理的污泥任意堆放和排放对环境造成了新的污染,其处理处置费用通常与污水处理费用相当。因而,如何将产量巨大,成分复杂的污泥,经过科学处理后,使其无害化、资源化,已成为我国乃至全世界环境界深为关注的课题之一。 本文针对西安市污水处理厂污泥的泥质特点,对其采用两相厌氧消化处理,将其稳定运行的数据与单相厌氧消化处理结果进行对比,并作理论分析。 两相厌氧反应系统处理后的结果表明:污泥可以在较短的停留时间（12.35d,其中产酸相1.25d,产甲烷相11.1d）,较高的有机负荷（约2.65kgVS/m³·d）下稳定运行,系统VS去除率38.87%,COD去除率43.45%,pH7.5,产气速率6.33L/L·d,单位VS产气率3.00L/g。 经对比发现,两相厌氧消化系统的停留时间是普通单相厌氧处理系统一半,而污泥有机负荷提高到普通厌氧反应池的2倍（普通厌氧反应池停留时间为15.07～25d,有机负荷为0.6～1.5kgVS/m³·d）。在相同水力停留时间下,两相系统的有机物的去除率大,处理效果好;出泥的VFA含量低,稳定性高,抗冲击负荷能力强;产气性良好,仅产甲烷相的气体产量是单相的1.17倍,所产气体的甲烷含量高达72.18%。 进行热能分析后可知,除了年极端温度,平时两相厌氧消化系统在满足自身消化处理热耗外还有盈余。同时论文在试验基础上,对两相厌氧消化法进行Eckenfelder动力学分析,得出产酸相系数:K₂=0.0178 g^-1·d^-1,S_n=22.2022g/L,Y=4.6425gVSS/gCOD,K_d=0.902d^-1;产甲烷相系数:K₂=0.0058g^-1·d^-1,S_n=17.5345g/L,Y=4.0096gVSS/COD,K_d=0.2181d^-1。更多还原

【Abstract】 With the economical development, the work of strengthening the municipal drainage and constructing the waste water buildings had been making in all places, and more wastewater treatment plant would produce a great deal of sludge with high water containing rate. Casually disposing these untreated sludge will cause the new pollution, and this charge is almost same as that of sewage disposal. So it becomes a more attention-getting discussion in the world’s environmental circles that how to make the volume-vast and composition-complicated sludge inoffensive and energy-producing by scientific process.According to the characteristics of the sludge of Xi’an city’s wastewater treatment plants, the paper adopted two-phase anaerobic digestion to treat sludge, and compared its results with the signal-phase anaerobic digestion data, then made a theoretical analysis.Some conclusions were inferred from the tests include: Volatile solids (VS) reductions of 38.87%, and chemical oxygen demand (COD) reductions of 43.45%, and pH is about 7.5 , and gas yield and gas production rate of 3.00 L/gVS·d and 6.33 volume per culture volume per day, respectively, at an high hydraulic retention time 12.35 days (acid-phase:1.25d, methane-phase: 11. 1d) and a low loading rate of 2.65kg VS/m~3·d.Overall, a two-phase WAS digestion process could be operated at one-half the HRT and double the loading rate of a conventional high-rate digester (the conventional high-rate digest’s HRT wasl5.07~25d, and the loading rate was 0.6～1.5 kgVS/m~3·d). At the same HRT, the two-phase system’s performance was considerably a little better ,the organic substances reductions were higher, and the volatile fatty acids (VFA) concentration fewer, so the process ran more stably, Especially when loading shock happened, it could resisted strongly. And the two-phase system had a high-gas yield, the gas-production rate of the methane-phase of the two-phase system can be 1.17 times that of signal-phase ones, and methane content was high to 72.18%.After making the heat energy analysis, We found while in common days but the extremely coldest winter days, the two-phase system could produced enough methane totransform into heat that completely satisfied all the reactor’s heat cost, even there was some heat remained. We also educed the kinetics model for two-phase anaerobic digestion of sludge on the basis of conclusion of tests. Acid-phase:K2=0.0178g"1?d"1, Sn=22.2022 g/L, Y=4.6425gVSS/gCOD, Kd=0.902d1; Methane-phase: K2=0.0058g"1?d1, Sn=17.5345g/L> Y=4.0096 gVSS/gCOD, K<,=0.2181 d1.更多还原