DEVICE AND METHOD FOR ESTABLISHING INFLOWS IN GROUND-BASED WASTEWATER TREATMENT PLANTS

摘要

The inflow control means comprise either a contact buffer or a buffer reservoir and pump means or both in combination with the inlet of a soil-based filter bed like a root space installation. The contact buffer is in direct flow communicating contact with an upper section of the filter bed on the infiltration side and dimensioned in adaptation to the throughput capacity of the soil-based filter bed such that variations in the waste water inflow are evened out. The same effect is achieved by the buffer reservoir and pump means wherein the pump delivers waste water from the buffer reservoir to the inlet and excess waste water is returned from the inlet to the buffer reservoir through a return line having a receiving end at a level which is preferably adjustable relative to the top surface of the filter bed. For evening out large differences in the waste water inflow, the contact buffer and the buffer reservoir including the pump means are preferably combined such that the buffer reservoir flow communicates with the contact buffer. The pump means, then, are adapted to be operated in the event that the variation in the waste water inflow exceeds the predetermined waste water inflow variations buffered by means of the contact buffer.