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首页> 外文期刊>Energy Conversion & Management >Comparative analysis between a conventional and a temperature-phased anaerobic digestion system: Monitoring of the process, resources transformation and energy balance
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Comparative analysis between a conventional and a temperature-phased anaerobic digestion system: Monitoring of the process, resources transformation and energy balance

机译：常规和温度相位厌氧消化系统的比较分析：监测过程，资源转化和能量平衡

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This study was carried out with the principal aim of obtaining reliable outcomes for the future implementation of a temperature-phased anaerobic digestion (TPAD) process in a large (2 M population equivalent, p.e.) WWTP. With the aid of pilot-scale (10 L) reactors fed by pure primary sludge (PS), a TPAD process, where the first and the second reactor were operated at 50 degrees C and 38 degrees C, respectively, was compared with a conventional mesophilic (38 degrees C) anaerobic digestion (AD) process. The initial hydraulic retention time (HRT) of the first, acidogenic, reactor of the TPAD was reduced from 3 to 2 days in the second part of the test.The results demonstrated that the TPAD system had been stable for all the duration of the test (approx. 100 days), as testified by the steady values of pH and tVFAs/TA ratio, notwithstanding the decrease in the HRT. The TPAD proved to be more efficient in volatile solid (VS) reduction and methane generation, compared to the conventional mesophilic AD process. In fact, the VS reduction increased from 42% to approx. 55% and the specific methane potential (SMP) from 280 to 332 NL/kg VS added. An excellent phase separation was observed between the two acidogenic and methanogenic reactors, as demonstrated by the low SMP (only 3% of the overall production) recorded from the first reactor of the TPAD system.However, the energy analysis demonstrated that the higher SMP obtained in the TPAD was not sufficient to compensate the higher amounts of heat required for sludge heating and heat loss compensation. Only a process of heat recovery could make the TPAD system really profitable, thus increasing the aliquot of energy in the form of methane, available for users external to the WWTP, by 20%. This result represents a step in the evolution of traditional WWTPs towards more energy efficient and sustainable facilities.
机译：本研究进行了本研究，主要目的是获得较大（2米人当量，P.E.）WWTP中未来实施温度相位的厌氧消化（TPAD）过程的可靠结果。借助于纯初级污泥（PS）喂养的先导尺度（10L）反应器，将第一和第二反应器分别在50℃和38℃下操作的TPAD方法，与常规相比嗜苯胺（38℃）厌氧消化（AD）过程。 TPAD的第一，酸性反应器的初始液压保留时间（HRT）在测试的第二部分中减少了3至2天。结果表明TPAD系统对于所有测试持续时间稳定（约100天），通过PH和TVFA / TA比的稳定值作证，尽管HRT减少。与常规的嗜苯胺的AD方法相比，TPAD被证明在挥发性固体（VS）还原和甲烷生成中更有效。事实上，VS减少从42％增加到约。从280至332个NL / kg V​​s增加55％和特定的甲烷电位（SMP）。在两个酸性和甲状腺反应器之间观察到优异的相分离，如从TPAD系统的第一反应器记录的低SMP（总体生产的3％）所示。然而，能量分析表明获得的更高的SMP在TPAD中不足以补偿污泥加热和热损失补偿所需的较高量。只有热量回收的过程可以使TPAD系统真正有利可图，从而增加了甲烷形式的等分试样，可用于WWTP外部的用户，达20％。该结果代表了传统WWTPS向更节能和可持续的设施演变的一步。

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