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<p>Currently, there is no effective, reliable, and independent natural method for complete sanitization of sludge. Hence, the objective of this study was to evaluate the effect of alkaline treatments on the sanitization of biosolids. The principle was based on increasing pH using quicklime, wood ash, and urea. To achieve this, the relationship between the quantities of adjuvant and the pH of the biosolids was first defined. Several concentrations of adjuvant were tested to achieve a pH ≥ 12 on 1&#xa0;kg of 40% dehydrated biosolids. Subsequently, treatments that reached the desired pH were subjected to further large-scale experiments (20&#xa0;kg of biosolids). Selected parameters to monitor sanitization were as follow: pH, EC, temperature, FC, FS, TC, presence of <i>E. coli</i> and helminth eggs, these were collected daily. Microbial indicators were monitored on a weekly basis. Lime treatments (2.5%, 5%, and 8%) and wood ash treatments (80% and 100%) increased the pH of the biosolids to 12, whereas urea treatments (1.5%, 2.5%, and 5%) had a maximum pH of 10. Although pH values in the biosolids of mixed treatments were above 12, they were not statistically different from single treatments from quicklime and wood ash (p ≤ 0.05). The average temperature remained stable in all treatments and similar to ambient temperature (25&#xa0;°C) throughout the study period (30&#xa0;days). However, electrical conductivity varied significantly (166.33 ± 8.08–555 ± 335&#xa0;ms/cm). During this experiment, all treatments allowed complete removal of Fecal Coliforms, Fecal Streptococci, Total Coliforms, and <i>E. coli</i>. However, only the 5% lime treatment allowed for total elimination of helminth eggs.</p>

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Assessment of the effect of alkaline additives for hygienization and inactivation of bacteria indicator and helminth eggs in faecal sludge

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月8日

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  • Joel Arnold Wafo Kamdem,
  • Guy Valérie Wafo Djumyom,
  • Paul Agendia Atabong,
  • Melanie Bawou A. Rim,
  • Tchianzeu Tekamdjo Stéphane Lauris,
  • Emmanuel Noumsi Foamouwe,
  • Emmanuel Youmbi

摘要

Currently, there is no effective, reliable, and independent natural method for complete sanitization of sludge. Hence, the objective of this study was to evaluate the effect of alkaline treatments on the sanitization of biosolids. The principle was based on increasing pH using quicklime, wood ash, and urea. To achieve this, the relationship between the quantities of adjuvant and the pH of the biosolids was first defined. Several concentrations of adjuvant were tested to achieve a pH ≥ 12 on 1 kg of 40% dehydrated biosolids. Subsequently, treatments that reached the desired pH were subjected to further large-scale experiments (20 kg of biosolids). Selected parameters to monitor sanitization were as follow: pH, EC, temperature, FC, FS, TC, presence of E. coli and helminth eggs, these were collected daily. Microbial indicators were monitored on a weekly basis. Lime treatments (2.5%, 5%, and 8%) and wood ash treatments (80% and 100%) increased the pH of the biosolids to 12, whereas urea treatments (1.5%, 2.5%, and 5%) had a maximum pH of 10. Although pH values in the biosolids of mixed treatments were above 12, they were not statistically different from single treatments from quicklime and wood ash (p ≤ 0.05). The average temperature remained stable in all treatments and similar to ambient temperature (25 °C) throughout the study period (30 days). However, electrical conductivity varied significantly (166.33 ± 8.08–555 ± 335 ms/cm). During this experiment, all treatments allowed complete removal of Fecal Coliforms, Fecal Streptococci, Total Coliforms, and E. coli. However, only the 5% lime treatment allowed for total elimination of helminth eggs.