In aerobic sludge fermentation projects, practitioners often face a dilemma regarding equipment selection: can a double screws compost turning machine replace conventional sludge compost fermentation machines? The answer is yes. Double screws compost turning machines are well-suited for sludge fermentation conditions and offer distinct advantages in small-to-medium-scale sludge resource recovery projects and channel-type fermentation processes; however, their application is not universal and requires careful consideration of sludge material properties and process conditions.
Double screws compost turning machines are particularly well-suited to the characteristics of sludge—specifically its high moisture content, high viscosity, and tendency to form hard crusts. Municipal sludge has high water content and a dense texture; when piled, it easily compacts, leading to internal oxygen deprivation, heat accumulation, and uneven fermentation. The twin-screw structure utilizes counter-rotating screws to provide powerful shearing, breaking, and deep-turning capabilities. This effectively breaks up crusted sludge layers, thoroughly turns over deep-seated material, and eliminates “dead zones” in the fermentation process. Additionally, the equipment features a self-cleaning function that minimizes the wrapping and accumulation of sticky sludge, ensuring continuous pile aeration and perfectly meeting the critical requirements for oxygen supply and moisture dissipation in aerobic sludge fermentation.
Furthermore, this equipment offers superior space utilization, making it ideal for centralized channel-type sludge fermentation. With its deep turning capability and uniform operational coverage, it enables stable fermentation of thick material layers and maximizes site utilization. It meets the scale requirements of small-to-medium sludge treatment projects, offering shorter fermentation cycles and more uniform maturation compared to traditional equipment.
However, there are limitations to using double screws compost turning machines for sludge. Raw, untreated sludge often contains numerous impurities and mixed fibers; prolonged operation can accelerate blade wear and increase maintenance costs. Therefore, practical application requires pre-treatment steps—such as mixing with bulking agents, screening to remove impurities, and adjusting moisture content. With proper material preparation and regular equipment maintenance, the double screws compost turner can reliably handle sludge fermentation and turning tasks, serving as a highly efficient choice for sludge resource recovery.
