Berghof Membranes, with its extensive experience in treating industrial effluent using PVDF tubular membranes, developed a compact AnMBR system for the Wisconsinbased dairy processor.
A biogas plant is a waste-to-energy installation where different waste materials such as livestock manure, organic fraction of municipal waste, or residues from the agrifood industry are converted into biogas. Biogas is an environmentally friendly source of energy in form of heat, electricity, and even biofuels.
the use of biogas instead of the fossil fuels is drawing significant attention as a tool for tackling climate change and reducing the greenhouse gas emissions. Apart from the inherent sustainability, biogas also entails significant advantages such as easy storage and use under demand or the off-grid, localized energy production for on-site use.
The biogas plants are based in the anaerobic digestion process, consisting on a set of biological processes in which microorganisms digest the waste material in air-tight tanks, producing the mentioned biogas. Moreover, the so-called digestate is produced: it consists on the organic material left over after the digestion. Digestate is rich in organic matter and nutrients such as nitrogen, phosphorus and potassium. Therefore, it can be valorized as a high-quality fertilizer.
The use of digestate as a source of fertilizers requires certain treatment. The most conventional approach is to use centrifugation for liquid-solid separation. In this way, a solid residue and a liquid fraction (centrate) are obtained. Traditionally, the centrate has been disposed directly into the land for soil conditioning. This entails some benefits, as long as the organic matter and nutrients contained in the digestate are brought back to the land in form of nutrients, but has been shown to present certain limitations that can hamper the future consolidation of the waste-to-energy approach as an alternative to the conventional sources of energy. In this scenario, more advanced technologies for digestate treatment are required day after day for managing the digestate in a more sustainable way, better than direct land disposal.
As a result, the implementation of membrane technologies for digestate management appears as one of the best available technologies as long as it provides important benefits, not only for the environment but also for the biogas plant operators and farmers, such as:
As previously introduced, the waste-to-energy process for biogas generation produces the digestate stream as a recoverable product that needs to be adequately managed. The digestate presents difficult to biodegrade organic matter, a significant presence of suspended solids, and high concentration of nitrogen. Berghof tubular UF is applied in two different configurations according to the treatment objectives, the project’s particularities and of course, focusing on achieving the most competitive CAPEX/OPEX in each case.
The external tubular MBR allows removing the difficult to biodegrade organic matter and nitrogen and produces high-quality water for discharge or reuse. On the other hand, direct tubular UF preserves and concentrates the nutrients for valorization producing high-value biofertilizers with minimal use of chemicals.
Made in a state-of-the art LEAN-production facility, with highly-trained production personnel and materials of the highest quality.
With 50 years of experience and more than 2.000 projects worldwide, Berghof Membranes is the leading manufacturer of high quality tubular ultrafiltration membranes.
50 years of experience and more than 2.000 project references across the globe.
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