Faculty of Materials, Civil and Environmental Engineering, Departure of Environmental Protection and Engineering, University of Bielsko-Biala, Willowa 2 Str, 43-309, Bielsko-Biala, Poland.
Environ Sci Pollut Res Int. 2023 Jan;30(5):13801-13810. doi: 10.1007/s11356-022-23164-9. Epub 2022 Sep 23.
The aim of the research work was to explain the possibilities of application of waste activated sludge (WAS) pretreatment processes prior to anaerobic digestion (mesophilic fermentation). Hydrodynamic disintegration and freezing/thawing disintegration methods were used. Based on the microbiological and parasitological analyses, a significant decrease in pathogenic bacteria, coliphages, and parasite eggs was observed. The number of bacteria analyzed (Salmonella sp., Escherichia coli, Clostridium perfringens) and coliphages were reduced from 19.3to 42.3% after hydrodynamic cavitation. A similar effect was achieved for destruction by freezing/thawing with dry ice between 7.8 and 14.9%. The effectiveness of parasite eggs reduction (Ascaris sp., Trichuris sp., Toxocara sp.) for these disintegration methods ranged from 10.7 to 29.3%. The highest results were observed for the hybrid disintegration method (hydrodynamic cavitation + dry ice disintegration) caused by a synergistic effect. Salmonella sp. in 1 g decrease about 69.7%, E. coli by 70.0%, Clostridium perfringens by 38.4%, and coliphages by 48.2%. Disruption of WAS by a hybrid method led to a reduction in the number of helminth eggs Ascaris sp. (63.8%), Trichuris sp. (64.3%), and Toxocara sp. (66.4%). After anaerobic digestion under mesophilic conditions, an additional reduction of analyzed bacterial pathogens and helminth eggs were observed. The introduction of hybrid disintegrated WAS to the fermentation chamber resulted in higher efficiency in decrease (from 1 to 23%) in comparison to the control sample (70%WAS + 30%DS (inoculum-digested sludge)).
本研究工作的目的是解释在厌氧消化（中温发酵）之前应用废活性污泥（WAS）预处理工艺的可能性。使用了水力空化和冷冻/解冻两种分解方法。基于微生物学和寄生虫学分析，观察到致病菌、噬菌体和寄生虫卵的数量显著减少。经过水力空化，分析的细菌（沙门氏菌、大肠杆菌、产气荚膜梭菌）和噬菌体数量减少了 19.3%至 42.3%。使用干冰进行冷冻/解冻也达到了类似的效果，破坏率为 7.8%至 14.9%。这些分解方法对寄生虫卵（蛔虫、鞭虫、旋毛虫）的减少效果为 10.7%至 29.3%。对于这些分解方法，混合分解方法（水力空化+干冰分解）的效果最高，这是协同作用的结果。在 1 克中，沙门氏菌减少约 69.7%，大肠杆菌减少 70.0%，产气荚膜梭菌减少 38.4%，噬菌体减少 48.2%。通过混合方法对 WAS 的破坏导致蛔虫卵（63.8%）、鞭虫卵（64.3%）和旋虫卵（66.4%）数量减少。在中温条件下进行厌氧消化后，分析的细菌病原体和寄生虫卵数量进一步减少。与对照样品（70%WAS+30%DS（接种消化污泥）相比，将混合分解的 WAS 引入发酵室可使效率提高 1%至 23%。
