How often should a wastewater treatment plant be serviced and what does maintenance include?

Domestic wastewater treatment plants are a critically important part of every modern building that is not connected to a centralised sewer network. They perform the vital function of treating wastewater before it is returned to the environment or reused. To operate efficiently, reliably and safely, these systems require regular maintenance. In this article, ERMAX BG will look at how often a wastewater treatment plant should be serviced and what exactly this process involves.

How often should a wastewater treatment plant be serviced?

The frequency of servicing depends on a number of factors, including:

1. the capacity of the system;
2. the load on the facility;
3. the type of technology used (flow-through, MBBR, etc.);
4. the characteristics of the incoming wastewater (pollution level, chemical composition);
5. the age and condition of the equipment.

In general, it is advisable to carry out a full technical maintenance check every 12 to 24 months. For treatment plants operating under a heavier load, or for older installations, more frequent maintenance is recommended: quarterly or even monthly. In certain cases, sensors and SCADA systems can be used to signal the need for maintenance on the basis of real operating parameters.

What does maintenance of a wastewater treatment plant include?

Servicing is not limited to cleaning. It includes a full technical inspection, control of the operating processes, cleaning, replacement of parts, measurements and tests. Let us look at the most important aspects.

1. Checking and cleaning the compressor air filter

The treatment facility operates with compressed air. This air is supplied by a piston (diaphragm) compressor, which is installed in the control panel. At the top of the compressor there is a cover that is fixed to the compressor with a screw. Unscrew the screw and remove the cover. Under the cover there is an air filter. This filter must be checked and cleaned every 3 to 4 months. Cleaning is done with a vacuum cleaner, sucking up the dust and debris that has stuck to it. The filter can also be washed with lukewarm water. After washing, the filter must be dried thoroughly before it is put back into the compressor. If the filter is very dirty, contact the service company so that it can be replaced with a new one. After you have cleaned or replaced the filter, put the cover back and tighten the screw. Make sure it is properly tightened.

2. Inspection and maintenance of aeration systems

Aeration systems are essential in aerobic treatment technologies. By supplying air, the activated sludge is stimulated to break down organic pollutants. Maintenance includes:

1. checking the condition of the diffuser membranes;
2. measuring the air pressure and flow rate;
3. cleaning the air pipes;
4. replacing worn parts, such as filters, membranes and compressors, when necessary.

Impaired aeration leads to a drop in efficiency and a risk of poorer quality of the treated water. Good aeration is also directly linked to odour control: a poorly functioning system can lead to unpleasant odours, especially in the warm months.

3. Checking and removing sludge (when necessary)

It is advisable to check for the build-up of excess activated sludge every 6 months (done by visual inspection of the facility).

4. Quality control and electronics

Modern treatment plants rely on sensors and automated control systems. They monitor the parameters of the water being treated. During servicing, the following are carried out:

1. calibration of sensors;
2. checking of connectivity, power supply and alarm signals;
3. software updates (if available);
4. tests of the system's response under different conditions.

Keeping these components in working order is especially important in more complex biological processes, where even a minimal deviation in the parameters can lead to failure in the treatment of the water.

5. Repair work and diagnostics

It is inevitable that certain parts of the system will require repair. Regular maintenance helps to catch signs of damage at an early stage:

1. unusual vibrations and noises;
2. a drop in pressure or flow rate;
3. changes in the colour or smell of the outgoing water.

When a defect is diagnosed, it is located, spare parts are ordered and the repair is carried out. After every intervention, a test of efficiency and tightness is carried out. A well-executed repair allows traceability and ensures compliance with environmental regulations.

Conclusion

If you own or manage a wastewater treatment plant and need professional servicing, trust the specialists. Our team offers periodic inspections, emergency repairs, staff training and personalised maintenance schedules. We serve clients in Plovdiv, Sofia, Varna, Pazardzhik and throughout the country. Contact us for an individual quotation or consultation. However advanced the technology, a lack of control and preventive maintenance leads to costly repairs, environmental risk and possible penalties. Well-planned maintenance not only extends the life of the facility but also guarantees its high efficiency, low costs and safe operation.