Composting is a suitable solution to reduce the high quantity of sewage sludge produced every year. Microbiological quality of compost should be evaluated before its use. In this circumstance, researching the faecal bacteria indicators becomes more interesting to confirm the compost safety in terms of pathogenic microorganisms, which can cause health risk for the soil–plant–human​ system.

This work monitored the evolution of pathogenic bacteria (faecal coliforms, faecal streptococci, Shigella spp and Salmonella spp.) during windrows co-composting of three mixtures with different proportion of lagooning sludge and green waste under semi-arid climate. It also investigated the evolution of two bacteriophages (Coliphages and Salmonella-phages) as an indicator of long-term compost hygienization.

The final composts showed a high reduction that reached 99% for faecal coliforms, faecal streptococci; and 100% for Shigella spp. and Salmonella spp. These reductions revealed the efficiency of composting on bacteria inactivation. Comparison between the survivals of the two bacteriophages showed that Salmonella-phages have less tolerance to inactivation than coliphages, it was totally eliminated after 45 days of composting, while coliphages were completely inactivated after 200 days. The complete destruction of the bacteriophages showed the safety and the good microbial quality of the three co-composting trials. These findings revealed that in the case of composting on windrows, a maximum temperature about 50 °C and time which, exceeds 5 months are essential to decrease pathogenic bacteria and virus to a safe level.

We conclude that co-composting conditions of mixtures containing half and one-third of the sludge were more adequate for a rapid destruction of pathogens, compared to mixture containing two-third of the sludge. Based on this study, we anticipate that the proposed analysis will yield a rapid indicator of co-composting hygienization design with less dependency simple and fast technique.

堆肥是减少每年产生的大量污水污泥的合适解决方案。堆肥的微生物质量应在使用前进行评估。在这种情况下，研究粪便细菌指标变得更加有趣，以从致病微生物方面确认堆肥的安全性，这可能会给土壤植物-人类系统带来健康风险。

这项工作监测了半干旱气候下三种不同比例泻湖污泥和绿色废物混合物的堆肥堆放过程中病原细菌（粪大肠菌，粪链球菌，志贺氏菌和沙门氏菌）的演变。它还研究了两种噬菌体（噬菌体和沙门氏菌噬菌体）的演变，以此作为长期堆肥卫生化的指标。

最终的堆肥显示粪便大肠菌，粪便链球菌的减少率高达99％。和100％的志贺氏菌属。和沙门氏菌属..这些削减透露堆肥对细菌灭活的效率。两种噬菌体存活率的比较表明沙门氏菌-噬菌体对灭活的耐受性比大肠杆菌噬菌体小，堆肥45天后它被完全消除，而大肠杆菌噬菌体在200天后被完全灭活。噬菌体的完全破坏表明这三个共同堆肥试验的安全性和良好的微生物质量。这些发现表明，在堆肥堆肥的情况下，约50℃的最高温度和超过5个月的时间对于将致病细菌和病毒减少到安全水平至关重要。

我们得出的结论是，与含有三分之二的污泥的混合物相比，含有一半和三分之一的污泥的混合物的共同堆肥条件更适合快速消灭病原体。基于这项研究，我们预计，所提出的分析将以较少依赖的简单快速的技术，提供一种协同堆肥卫生设计的快速指标。