The maintenance of a biogas plant is an essential step in its operation. For the project developer, this is a major investment that he must include in the operational costs of the biogas plant. However, paying special attention to certain aspects such as technical equipment, anaerobic digestion biological process and safety has several advantages. How can the project developer optimize the maintenance of these aspects of the biogas plant? What technologies can be used to reduce maintenance costs? Here is an overview.
Please note: This article is writen for general information only using publicly available sources mentionned below. If you are planning a biogas project, please make sure to connect with a professional company to discuss applicable standards in your country.
Maintaining a biogas plant means doing minor repairs to the equipment, changing its oil as needed, removing debris from organic matter that falls to the bottom of the tank, solving problems in the process and many other actions.
Of course, staying on the lookout for such situations and resolving them quickly requires time and money for the project developer. Maintenance accounts for about one third of the annual costs of operating a biogas plant.
Source: BioEnergy Farm
This share may vary depending on the type of project. Because it is such an investment for the project developer, it must be taken into account during feasibility studies of the biogas project to evaluate the profitability of anaerobic digestion.
The Guide about Biogas [PDF, French, 7416 kb], written by the German Society for International Cooperation (GIZ), further clarifies these issues.
Despite some obstacles, regular maintenance of the biogas plant is advantageous for the project developer.
Among other things, the advantages include:
How can the developer of biogas projects optimize the maintenance of his biogas plant? Here are our tips.
The developer must keep a close eye on the operation of the technical equipment of the biogas plant to ensure its availability. Indeed, the stability of the biogas production process depends on the proper operation of the equipment.
In general, it is advisable to:
In addition, parts of the technical equipment require other maintenance actions. The EnergyPedia page about the maintenance of a biogas plant offers some more details.
If the developer identifies a technical malfunction of the equipment, he must first consult the instructions for using the plant. They contain recommendations on what to do if there is a problem with a particular part.
In general, the project developer must detect and repair the technical problem as quickly as possible to limit its impact on the biogas plant. It can also be equipped with an automated alert system that alerts a manager when a technical failure occurs.
Regular monitoring and control of the biological process of biogas is an essential part of the maintenance of a biogas plant. Indeed, problems in the biological process is the fifth most frequent cause of malfunctions of the plant, according to the Bioenergy Farm Website.
Source: Bioenergy Farm
This is why the project developer must equip himself with technologies to monitor the biological process, detect deviations from the desired characteristics and those obtained, and solve them. They must be adapted to the conditions of the biogas plant.
These technologies can be automated, which gives the plant independence from specialized personnel, but it is expensive. Here are some variables of the biological process to monitor and control:
In order to ensure the safety of the biogas plant, the operator must regularly assess and mitigate the potential risks.
The project developer must therefore establish security rules, some of which are specific to maintenance, and monitor them regularly. Risks include, for example:
To prevent possible accidents, the project developer can, among other things:
For more information, take a look at our article on the risks associated with a biogas plant.
Biogas plant maintenance comes at a high cost, especially when talking about the digester tank. The project developer must, among other things, acquire the relevant technological tools and call in specialized personnel.
The need to shut down the plant for a long period during maintenance has consequences:
Faced with these complex challenges of maintaining a biogas plant, the project developer can turn to using certain technologies. Here is an example.
The self-cleaning digester system by Fitec is composed of a sediment separator and a floor grit cleaner. This system reduces costly digester shutdowns for cleanouts and to remove non-digestible residues that accumulate at the bottom of the digester.
Tom Ferencevic from Fitec explains how this technology works:
” The floor cleaning system is made up of three main components, a double arm floor sweeper, a floor drain with integrated pump and a sediment trap. Each component of the floor cleaning system works in a coordinated and fully automated manner (24/7) to continuously remove any settled material from the bottom of a digester or vessel. The floor sweeper and floor drain are installed in all tanks but the sediment trap can be shared between two tanks to reduce costs.”
Among the advantages of this technology are:
The self-cleaning digester system can be installed on existing tanks and on any new tank with a minimum internal diameter of 18 m. Most of Fitec’s customers have chosen to integrate the system with concrete fermenters with concrete roof.
See the self-cleaning digester system page for more information.
Fitec is the manufacturing arm of Finsterwalder Umwelttechnik, an environmental engineering firm specializing in design of anaerobic digestion systems. They are particularly dedicated to the treatment of urban organic materials.
Fitec is in charge of the equipment for the treatment of organics and for anaerobic digestion. Currently, Fitec manages projects with a combined capacity of 4 MW of biogas and the equivalent of 100,000 tonnes of organic matter per year.
Currently, the company is working on 2 major projects that will use its self-cleaning digester system :
In addition to the costs, the maintenance of a biogas plant presents other challenges for the project developer. Other companies, among our members, could lend you a hand! Here are some examples.
This German company specializes in agitators, mixing systems and design. It offers a design service, help you choose the right technology and support for the maintenance of biogas projects, among others.
Balmoral Tanks is the European leader in anaerobic digestion and biogas tanks. The company also provides technical services for the installation, inspection, repair and maintenance of biogas plants.
Schumann Tanks designs, manufactures and installs custom bolted storage tanks, including bolted stainless-steel tanks, and epoxy coated steel tanks. The company offers impeccable after-sales service.
Boerger specializes in the development, production and marketing of pumps and grinding and booster systems for the delivery of abrasive liquids. The company also offers support for the maintenance of biogas plants, among others.
Moreover, do not hesitate to consult our catalog of suppliers to find a company that will meet your needs!