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An analysis of the transport of bacteria from biosolids through the unsaturated profiles of three different soils.

機譯：通過三種不同土壤的非飽和剖面分析生物固體中細(xì)菌的遷移。

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Stabilized sewage biosolids are commonly used as a soil amendment, but transport through soil of any microbial pathogens present is poorly understood. Soils differ fundamentally in texture and structure; those containing greater amounts of finer particles tend to form more stable structures that allow water to percolate but bypass the soil matrix. Undisturbed soil monoliths were collected from three representative Ontario soils.{09}Transport of microorganisms through these monoliths was investigated under controlled conditions, using bacteria present in liquid and dewatered stabilized sewage biosolids ( Escherichia coli, Salmonella spp., fecal streptococci and Clostridium perfringens) and two tracers (Geobacillus stearothermophilus and fluorescent polystyrene microspheres). Transport of bacteria was mainly associated with preferential flow. More microorganisms were transported through finer-textured soils than coarser-textured materials, and more were transported following the application of liquid biosolids than after dewatered material. E. coli and fecal streptococci were good indicators for transport of vegetative pathogens and microspheres, but not of spore-forming bacteria.
機譯：穩(wěn)定的污水生物固體通常用作土壤改良劑，但對土壤中存在的任何微生物病原體的運輸知之甚少。土壤在質(zhì)地和結(jié)構(gòu)上根本不同。那些含有大量細(xì)顆粒的顆粒傾向于形成更穩(wěn)定的結(jié)構(gòu)，從而使水滲透但繞過土壤基質(zhì)。從安大略省的三種代表性土壤中收集未受干擾的土壤整料。{09}在受控條件下，使用液體和脫水的穩(wěn)定污水生物固體（大腸桿菌，沙門氏菌，糞便鏈球菌和產(chǎn)氣莢膜梭菌）中存在的細(xì)菌，研究了微生物通過這些整料的運輸。和兩個示蹤劑（嗜熱脂肪芽孢桿菌和熒光聚苯乙烯微球）。細(xì)菌的運輸主要與優(yōu)先流動有關(guān)。與質(zhì)地較粗的物質(zhì)相比，通過質(zhì)地較細(xì)的土壤運送的微生物更多，而在施用液體生物固體后，與脫水物質(zhì)相比，運送的微生物更多。大腸桿菌和糞便鏈球菌是營養(yǎng)性病原體和微球體運輸?shù)牧己弥笜?biāo)，而不是孢子形成細(xì)菌的運輸。

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