Hello,
we moved into our house last year and had the same issue. (I also found help here in the forum). Our house is built into a slope. The street is at least 5 meters below the sewer.
For us, this was also solved with a pumping station. The wastewater flows out of the house with a gradient into the pump shaft.
The pump shaft is a large plastic container in which a dual pump system is installed. When the water level reaches a certain point, the pumps start alternately and pump the water under high pressure to the inspection shaft at the street and then into the sewer.
Right at the house we installed a small control cabinet with the technology. Furthermore, there is a vent pipe in the garden.
We set the shaft deeper than the lowest water outlet in the house (for us, the floor outlet of the shower).
If there is ever a technical problem, in the worst case water would run into the garden.
However, a lot would have to happen for that to occur. I would only consider this during planning.
There is also the possibility to install a backflow flap in front of the pump shaft. We were advised against this.
If the flap ever sticks, water definitely runs into the house.
Our rainwater / surface water seeps away in the garden.
We have the model from Jung pumps. After one year there are no problems.
I’ve heard too many bad stories about lifting stations. If something goes wrong here, you have the problem inside the house and not outside.
We couldn't notice any odor. The lid hardly disturbs. According to the meter, the pump runs 1-2 times a day. We probably heard it about 10 times in that one year. It pumps for a few seconds and that’s it. Our pump manages 18 sqm per hour. You also asked about the amount.
Best regards
Mark