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首页> 外文期刊>Environmental Science & Technology >Particulate Organic Carbon Solubilization in an Acid-Phase Upflow Anaerobic Sludge Blanket System
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Particulate Organic Carbon Solubilization in an Acid-Phase Upflow Anaerobic Sludge Blanket System

机译：酸相上流厌氧污泥覆盖系统中的颗粒有机碳增溶

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摘要

The effects of operational and environmental parameters on particulate organic carbon solubilization during the acid-phase digestion of primary municipal sludge were studied using a bench-scale, upflow anaerobic sludge blanket (UASB), continuous-flow reactor. Short-chain volatile fatty acids (VFAs),the main products of the process, are preferred substrates for the bacteria involved in the biological removal of phosphorus. Both particulate organic matter solubilization [measured by filtered total organic carbon (TOC) increase or volatile suspended solids (VSS) reduction] and product formation (mainly VFAs) were affected by the changes in hydraulic retention time (HRT) from 6 to 15 h. Variation in solids retention time (SRT) from 5 to 20 days (at a constant HRT of 12 h) had a small effect on specific TOC solubilization rate and percent VSS reduction. In contrast, VFA production decreased sharply at the shortest SRT investigated. At an HRT of 12 h and a SRT of 20 days, a decrease in pH from 5.1 to 4.5 did not significantly influence system behavior. However, an increase in pH from 5.1 to 6.1 produced a higher specific TOC solubilization rate and a lower net VFA production. The settling properties of the UASB sludge blanket were excellent. Gas generation from the system was small. The amount of VFAs generated, in most runs, was large enough to support subsequent biological phosphorus removal processes.
机译：使用台式规模，上流厌氧污泥层（UASB）连续流反应器研究了运行和环境参数对城市市政一级污泥酸相消化过程中颗粒有机碳增溶的影响。该方法的主要产物短链挥发性脂肪酸（VFA）是参与生物除磷的细菌的首选底物。水力停留时间（HRT）从6到15 h的变化都影响了颗粒状有机物的溶解（通过过滤总有机碳（TOC）的增加或挥发性悬浮固体（VSS）的减少来衡量）和产品形成（主要是VFA）。固体保留时间（SRT）从5天变化到20天（恒定的HRT为12小时）对特定的TOC增溶速率和VSS降低百分比影响很小。相反，在调查的最短SRT上VFA产量急剧下降。在HRT为12 h和SRT为20天时，pH从5.1降低到4.5不会显着影响系统行为。但是，pH值从5.1增加到6.1会产生更高的比TOC增溶速率和更低的净VFA产生。 UASB污泥层的沉降性能非常好。系统产生的气体很小。在大多数运行中，生成的VFA数量足以支持后续的生物除磷过程。

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