Thermal hygienization of excess anaerobic sludge: a possible self-sustained application of biogas produced in UASB reactors
Thermal hygienization of excess anaerobic sludge: a possible self-sustained application of biogas produced in UASB reactors
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DOI：
10.2166/wst.2005.0698
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发表时间：
2005-01-01
影响因子：
2.7
通讯作者：
Chernicharo, CAL
中科院分区：
文献类型：
--
作者：
Borges, ESM;Godinho, VM;Chernicharo, CAL
当前污水处理厂（WTP）污泥最终处置的主要趋势包括：农业中营养物和有机物的安全利用、污泥消毒和垃圾填埋场的限制使用。对于污泥卫生化，蠕虫卵已被用作确定该过程有效性的主要参数，其灭活可以通过在不同温度和其他条件下的热处理来实现。在这种背景下，本研究的目的是确定UASB反应器中产生的沼气如何有效地用作多余厌氧污泥热卫生的热能来源，并以蛔虫卵作为指示微生物，以及该系统是否可以在自我维持的基础上运行。实验在一个中试规模的工厂中进行，该工厂包括一个 UASB 反应器、两个沼气柜和一个热反应器。事实证明，这项调查对发展中国家极为重要，因为它为污泥卫生提供了一种简化且完全自我可持续的解决方案，同时使此类材料能够再用于农业目的。还应该指出的是，当用于处理生活污水时，使用UASB反应器产生的沼气足以完成该系统产生的所有剩余污泥的热卫生。
The main current trends in final disposal of sludge from Wastewater Treatment Plants (WTP) include: safe use of nutrients and organic matter in agriculture, sludge disinfection and restricted use in landfill. As to sludge hygienization, helminth eggs have been used as a major parameter to determine the effectiveness of such process, and its inactivation can be reached by means of thermal treatment, under varying temperature and other conditions. In such context, the objective of this research was to determine how effectively biogas produced in UASB reactors could be used as a source of calorific energy for the thermal hygienization of excess anaerobic sludge, with Ascaris lumbricoides eggs being used as indicator microorganisms, and whether the system can operate on a self-sustained basis. The experiments were conducted in a pilot-scale plant comprising one UASB reactor, two biogas holders and one thermal reactor. The investigation proved to be of extreme importance to developing countries, since it leads to a simplified and fully self-sustainable solution for sludge hygienization, while making it possible to reuse such material for agricultural purposes. It should be also noted that using biogas from UASB reactors is more than sufficient to accomplish the thermal hygienization of all excess sludge produced by this system, when used for treating domestic sewage.