System for extracting waste heat from drain water and separating relatively uncontaminated water for reuse in street cleaning firefighting, etc.

摘要

Drain water can be regarded as gray or brown. Gray water, e.g. rainwater and land drainage water may not be fit for drinking purposes, but can be reused for other purposes, e.g. firefighting, street cleaning, without decontamination. Brown water comes from sanitary installations, washing machines, kitchens, etc and has to be processed before discharge or reuse. The present system uses separate drain systems (1, 2) and also transfers waste heat to mains water input channels (3).