If the sewage sludge is not treated appropriately, it is considered waste requiring disposal. At present, it is mainly transported to mono-incineration plants, where it is burnt, at high transport and disposal costs. The resulting ash is still contaminated with pollutants and must be disposed of in landfills.
The RSR process, on the other hand, utilises sludge from sewage treatment plants of all kinds with dry matter contents of about 0.1 % to about 30 %. It is therefore possible to feed already dewatered sludge or thin sludge. The RSR plant is planned modularly according to the customer's requirements and is permanently installed on site or delivered mobile in several containers in ISO format.
Depending on the desired subsequent product path, additional modules may have to be connected. For example, for the energy-positive production of CO2-neutral biofuel, the dryer and/or pelleting or firing modules are required. However, this also means that no additional thermal energy sources are needed.
Whether the sewage sludge is taken over fully continuously directly from the press or from the thin sludge with an additional upstream centrifuge depends on the jointly developed concept.
The core process runs with 20 - 30 % dry sewage sludge as it comes off the press or the centrifuge.
In the first step, the sewage sludge is cleaned with a small addition of our activator and the organic matter is separated from the inorganic matter in a centrifuge.
In the following step, the sewage sludge, which at this point is no longer sewage sludge by definition, is washed and also centrifuged again so that it can be further used as fertiliser.
The water requirement as well as the washing water concentration are also adapted to the sewage treatment plant in such a way that no additional pollution occurs.
In order to make this process as simple as possible, cooperation with the sewage plant attendants has led us to automate everything so that only the handling of consumables and products remains.
The system is designed so intuitively that every sewage plant attendant can read off the required values and act accordingly without any training.
The sludge is transported to the RSR plant container by wheel loader, excavator or conveyor belt. Alternatively, it can also be transported directly from the stock by pipe.
The entire RSR process for sludge treatment takes place in the plant container. With the help of a special activator (PecuLEACH), up to 80 % of the inorganic components are dissolved out of the dry material. These are filled for further utilisation as NPK fertiliser (nitrogen-phosphorus-potassium fertiliser = PecuPHOS) for the chemical industry. At the same time, the remaining substance can be used as high-quality compost (PecuGROW) in gardens and fields.
OPTIONAL PRODUCT WAY - DRYING: If the refined sludge is not used as humus but dried further, a CO2-neutral biofuel (PecuPOWER) is produced, comparable to pellets, which can be used thermally through combustion and releases heat back into the system.