Automatic Sanitary Sewer Lift Station

A sanitary sewage lift station, also known as a wastewater lifting station or wastewater pumping station, collects and pumps wastewater from drainage points located below the main sewer line or backflow level. The Mislier system provides an automatic drainage solution for basement bathrooms, residential properties and commercial buildings where gravity drainage is not possible.

When we make an initial selection for a customer, we do not look at tank capacity alone. Design flow, total dynamic head, wastewater composition, solids size, standby requirements, installation space, control method and alarm configuration all affect operating stability and service life.

Villa and residential basement bathrooms

Hotels, schools, hospitals and office buildings

Shopping centres, gyms, public restrooms and laundry rooms

Commercial or industrial auxiliary facilities requiring wastewater lifting

For restaurants and commercial kitchens, we first confirm the grease content of the wastewater. Food-service wastewater normally requires a grease interceptor in accordance with local regulations. Large amounts of grease should not be discharged directly into a standard sanitary sewage lift station because this can increase sediment buildup, blockage and odour risks.

Space-Saving Tank Design: Basement plant rooms and renovation projects often have limited space, so we designed a compact tank that is easier to position in confined installation areas.

Dual Heavy-Duty Pump Configuration: Two large-passage pumps with oil-cooled mechanical seals provide a more reliable solution for duty rotation, assisted pumping and standby protection.

Efficient Discharge System: The system uses a DN80 pressure discharge pipe with a built-in flap-type check valve. We verify the backflow prevention requirements for each project to help reduce wastewater return after the pump stops.

Flexible Inlet Design: Inlet direction and pipe position vary from one project to another. Multi-directional DN100 and DN50 inlet options, together with a DN50 vent connection, allow installers to adapt the piping to actual site conditions.

Easy Installation: The unit supports vertical or horizontal pipe connections, giving installers more flexibility and helping reduce rework caused by mismatched pipe positions.

Smart Monitoring and Alarm System: The full range is equipped with air-pressure detection, a forced-start float-switch alarm and Wi-Fi remote monitoring. After commissioning, customers can check equipment status remotely, while alarm information helps us support initial fault diagnosis.

Dual Liquid-Level Control: Air-pressure control and a float switch work together to add a second layer of protection beyond normal level control, improving operational safety.

High Start Frequency: The pump can operate at up to 60 starts per hour. For applications with fluctuating inflow or frequent drainage cycles, we check the expected inflow and start/stop levels before confirming the operating frequency.

Extended Warranty Option: A five-year warranty option is available for projects requiring longer-term operating and after-sales support. Please confirm the applicable coverage with us before order approval.

We normally begin with the following six points. The more complete the project information, the more accurately we can match the pump model, tank and control system to actual site requirements.

Confirm the wastewater sources: List toilets, washbasins, showers, floor drains, washing machines and other connected fixtures. State whether the wastewater contains grease, fibres or corrosive substances.

Determine the peak flow: Consider fixtures that may discharge at the same time instead of relying only on average daily water consumption.

Calculate total dynamic head (TDH): Include vertical lift, friction losses in horizontal piping, bends, valves and discharge pressure.

Select the pump and tank: Base the selection on solids passage, required flow at the actual duty point, start/stop levels and allowable start frequency.

Choose a single- or dual-pump system: A single pump may be suitable for light residential loads. Dual pumps should be prioritised for commercial buildings and applications where downtime is unacceptable.

Check installation and electrical requirements: Confirm inlet height, maintenance clearance, venting, pipe diameter, voltage, alarms and remote-monitoring requirements.

Based on our project-selection experience, a larger tank is not always better. An undersized tank can cause frequent starts or overflow during peak inflow, while an oversized tank may increase wastewater retention time, sediment buildup and odours. Tank capacity should be selected according to the design inflow, pump flow at the actual head, the difference between start and stop levels, and the allowable starting frequency.

Maximum flow and maximum head are not achieved at the same operating point. For engineering selection, the required flow and total dynamic head must be checked against the pump performance curve to confirm that the duty point lies within the recommended operating range.

Selecting the correct equipment is only the first step. We also review piping, ventilation, electrical requirements and maintenance access with the customer because many operating problems are related to site installation conditions.

Confirm tank dimensions, inlet height and sufficient clearance for opening the cover and removing the pump.

Check pressure-pipe diameter, vertical lift, horizontal pipe length, bends and valves.

Connect the vent pipe in accordance with local drainage regulations. Never block the vent.

Install the control cabinet in a dry location that is easy to inspect and maintain.

During commissioning, test the level-based start/stop function, alarms, check valve and dual-pump changeover.

Regularly test the alarm and standby pump, and inspect the check valve, seals, level controls and control cabinet.

We specifically remind customers that wet wipes, sanitary products, textiles, hard objects, construction debris and large amounts of grease must not enter the system. Even when a macerator pump is installed, the unit is not designed to handle every type of solid waste.

Frequently Asked Questions

1. When Is a Sewage Lift Station Required?

A sewage lift station should be considered when sanitary fixtures are below the main sewer line, gravity drainage is not possible, or there is a risk of wastewater backflow.

2. How Do I Choose Between a Single-Pump and Dual-Pump System?

A single-pump system is suitable for lower loads where brief downtime is acceptable. A dual-pump system provides alternating operation and standby capacity, making it more suitable for commercial buildings and applications that cannot tolerate shutdowns.

3. How Is the Required Pump Head Calculated?

Use total dynamic head, including vertical lift, friction losses in horizontal piping, and losses caused by bends, valves and discharge conditions.

4. Can the System Handle Greasy Restaurant Wastewater Directly?

Generally, no. Food-service wastewater normally requires grease separation or oil-water separation in accordance with local regulations before entering the lifting station. This helps reduce blockage, sediment buildup and odour risks.

5. How Often Does a Sewage Lift Station Require Maintenance?

The maintenance interval depends on operating frequency and wastewater composition. Follow a project-specific maintenance plan, regularly test the alarm and standby pump, and inspect the check valve, level controls, seals and control cabinet.

Request a Project Selection Recommendation

Please provide the application, number of sanitary fixtures, wastewater type, peak flow, vertical lift, horizontal pipe length, pipe diameter, voltage, single- or dual-pump requirement, and order quantity. MISLIER will recommend a suitable tank capacity, pump model and control solution based on the actual operating conditions.

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