Small wastewater treatment plants: prices and costs

Of course, prices play an important role in the construction of a small sewage treatment plant. But also the costs for the current operation should be considered.

construction costs

For the construction costs of the small wastewater treatment plant various factors play a role. They are therefore very different in individual cases. The prices start at around 3,000 EUR, but can also be up to 20,000 EUR for medium-sized facilities.

plant size

The most important factor is of course the size of the system. Minimum size for most plant types is 4 pe - ie 4 population equivalents. Up to a size of 50 PE is technically still spoken by small wastewater treatment plants.

type of plant

The type of plant also plays an important role for the price. Technical plants such as SBR plants are generally much more expensive than near-natural processes - such as the plant water treatment plant or the sewage pond.

cleaning class

However, the required cleaning class also plays a role in the selection of the system type. It is prescribed by the authority and must be adhered to.

Higher cleaning classes or additionally required cleaning services can exclude certain system types from the outset. You can also increase the cost of a small wastewater treatment plant very quickly.

Local conditions

The local conditions also play a price-determining role. Depending on the existing terrain structure, existing receiving water and the condition of the wastewater, these factors also have a decisive effect on the price of the wastewater treatment plant.

Costs during operation

On the owner of a small sewage treatment plant come energy costs and costs for sludge disposal and
Maintenance and testing too.

energy costs

Some small wastewater treatment plants work completely without electricity. In other systems, a corresponding amount of external energy for the operation of pumps or ventilation is required. The amount of electricity depends on the plant type and size.

sludge disposal

The resulting sewage sludge must be disposed of at regular intervals. For most plants this is once or twice a year. The costs are here with smaller plants at around 200 euros per disposal.

Maintenance and testing

According to the legal regulations, small wastewater treatment plants have to be serviced twice to three times a year. For this purpose, certain tests of the process quality must be carried out.

The costs for the inspectors and the maintenance depend on the type of plant, the size of the installation and the legal regulations. A maintenance contract offers a cost reduction in many cases.

Tips & Tricks

The construction of a small sewage treatment plant can be supported by state funds. However, the owner has to pay for the costs during operation.

Video Board: Small On-Site Wastewater Treatment Systems