CAILu,CHENJun,FENGHao.Discussion on Key Design Parameter of Municipal Sludge Aerobic Fermentation Project: Fermentation Cycle[J].China Water & Wastewater,2022,38(18):72-77.
城市污泥好氧发酵工程关键设计参数发酵周期探讨
- Title:
- Discussion on Key Design Parameter of Municipal Sludge Aerobic Fermentation Project: Fermentation Cycle
- Keywords:
- sludge; aerobic fermentation; composting; drying; fermentation cycle; maturity
- 摘要:
- 发酵周期是决定城市污泥好氧发酵工程能否达到预期运行效果的关键设计参数，也是影响工程占地面积和工程造价的重要参数。从脱水减量化、高温无害化、稳定腐熟化等角度，结合发酵产物用途、标准要求和工程实践，探讨适宜的好氧发酵周期，为工程设计提供借鉴。研究表明，至少15 d的主发酵周期才能达到脱水减量化和无害化部分指标要求。若产物用于焚烧，主发酵周期可设为15 d；若用于土地改良，主发酵周期至少设为20 d；若进行农林地利用，建议主发酵后接续后腐熟，全周期至少设为30 d。因此，在工程实践中，主发酵周期至少设为15 d，后腐熟时间可根据产物用途设为5~15 d或更长。
- Abstract:
- Fermentation cycle is a key design parameter that determines whether the municipal sludge aerobic fermentation project can achieve the expected performance, and also an important parameter that affects the project footprint area and construction investment. From the aspects of dehydration reduction, microbial inactivation and maturity, the suitable aerobic fermentation cycle was discussed based on the product applications, standard requirements and engineering practices, which aimed to provide reference for engineering design. The main fermentation cycle to meet part of the dehydration reduction and microbial inactivation index requirements should be at least 15 days. If the product was used for incineration, the main fermentation cycle could be set to 15 days, and at least 20 days for soil conditioner. If the product was used as fertilizer in farmland or forestland, it was recommended that the whole cycle of main fermentation and subsequent maturity should be at least 30 days. In engineering practice, the main fermentation cycle should be at least 15 days, and the maturity cycle could be set to 5-15 days or longer depending on the use of the product.
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