effluent treatment plant

waterway river canal bridge water pond stream reservoir walkway watercourse tree garden wetland trail channel fishpond track transport concrete treatment plant wastewater treatment bridge sewage canal sedimentation decantation tanks safety maintenance building equipment pumps control natural environment vegetation trees rural infrastructure public health pollution purification effluent recycling sustainability conservation reuse filtration disinfection sludge composting resources quality water monitoring efficiency technology process engineering management sanitation environmental impact regulation landscape countryside tree recycle