Activated sludge plant, municipal and industrial, effluent treatment, Environmental services, renewable energies, Energy, Environment, Sedimentation tanks, effluent treatment, Effluent purification systems, biological, textile fixed bed, Sludge compacting equipment, effluent treatment, Filter-beds, screening, for coarse solids, effluent treatment, Pre-screening systems, single or multi-stage, water and effluent treatment, Biogas driers for sewage sludge treatment plant, Degassing equipment, vacuum, for sewage and effluent plant