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首页> 外文期刊>Journal of King Saud University >Application of solarization for sanitization of sewage sludge compost
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Application of solarization for sanitization of sewage sludge compost

机译：太阳能在污水污泥堆肥消毒中的应用

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Performance of the solarization process on inactivation of pathogenic bacteria was explored to provide the sanitization standards set for the sewage sludge compost. For evaluation of the microbiological quality of sludge compost and the sanitation efficiency of solar application,Escherichia coli, thermotolerant coliforms, Clostridium, and Enterococci were selected as the indicator microorganisms. Unsolarized (control) treatment was conducted at room temperature (25?±?2?°C) in laboratory conditions. Solarization treatment was performed under heating conditions, where the sufficient ultraviolet radiation was directly provided by sun. The results indicated that solarization remarkably increased the temperature of sludge compost to maximum 65?°C at 5?cm of compost depth. The inactivation rates of indicator microorganisms exposed to the solarization treatment were recorded significantly higher than the unsolarized treatment. Among the indicator microbial agents,E. coliwas found as the most susceptible microorganism and lowered from 4?log?CFU?g?1to undetectable levels after 6?days of solarization process. However, the reduction rate of the unsolarized group of this bacteria was determined to be less than the 1-log within 15?days of the entire experimental period. For the solarized compost, the viability of Enterococci ranged from 2.31?log?CFU?g?1to 1.80?log?CFU?g?1within 6?days and reduced to below the detection limit (2?×?101?cells as CFU) after 12?days of solar application. The reduction rates of thermotolerant coliforms and Enterococci were slow (kmax?=?3.22 and 3.27?day?1, respectively), but they were reduced to below the detection limit within 12–15?days. The inactivation curves demonstrated that Clostridium showed more resistance to heat provided by solarization compared with other indicator microorganism species. The Clostridium reduction in solarized treatment was determined as 3-log, while the unsolarization treatment provided 0.7-log reduction. Findings of this study clearly corroborated that the temperature profile generated by the solarization process was adequate for elimination and/or inactivation of various microbial pathogens to achieve the desired standards within two weeks.
机译：探索了日光化过程对致病菌灭活的性能，从而为污水污泥堆肥提供了卫生标准。为了评估污泥堆肥的微生物质量和太阳能应用的卫生效率，选择了大肠杆菌，耐热大肠菌，梭菌和肠球菌作为指示微生物。在实验室条件下于室温（25？±？2？°C）下进行未经日晒（对照）的处理。在加热条件下进行日光化处理，其中直接由太阳提供足够的紫外线辐射。结果表明，在堆肥深度为5？cm时，日光化作用使污泥堆肥的温度显着提高到最高65？C。记录到暴露于日晒处理的指示微生物的灭活率显着高于未日晒处理。在指示微生物剂中，E。大肠杆菌被认为是最易感染的微生物，经过6天的日晒过程后，它从4？log？CFU？g？1降至无法检测的水平。但是，在整个实验期间的15天之内，该细菌的未分解基团的还原率被确定为小于1-log。对于日晒堆肥，肠球菌的生存力在6天之内范围从2.31？log？CFU？g？1到1.80？log？CFU？g？1不等，并降至检测极限以下（2？×？101？细胞作为CFU）。太阳能应用12天后。耐热大肠菌群和肠球菌的降低速度较慢（分别为kmax？= 3.22和3.27？day？1），但它们在12-15天之内降至检测限以下。灭活曲线表明，梭状芽胞杆菌显示出比其他指示微生物种类更多的耐日光加热的能力。在日晒处理中梭菌减少量被确定为3-log，而未日化处理提供的梭菌减少量为0.7-log。这项研究的发现明确证实了日晒过程产生的温度曲线足以消除和/或灭活各种微生物病原体，从而在两周内达到所需标准。

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