Device for the separation of oil from wastewater in treatment plants
DE501440C
Device for accelerated sludge consumption
DE555796C
Wastewater treatment plant with mucous membrane supports suspended in the settling room, consisting of individual bars, individually or in small groups
DE512211C
Sewage treatment plant
DE492809C
Device for the decomposition of sewage sludge in septic tanks
DE509915C
Device for direct drainage of rainwater in sewage systems
DE505154C
Device for cleaning waste water with activated sludge and for digesting this sludge in a single container
DE526166C
Device for the clarification of waste water using activated sludge
DE503336C
Treatment plant for waste water
DE494570C
Device for accelerated sludge digestion
DE530549C
Device to accelerate sludge decomposition in septic tanks