Activated sludge process 1 Article 1 Biochemical engineering 1 Biological water treatment 1 Caffeine 1 Chemical industry 1 Chemical pre-treatment 1 Conventional activated sludges 1 Degradation 1 Degradation efficiency 1 Denitrification 1 Denitrifying microorganisms 1 Drug products 1 Efficiency 1 Municipal wastewater treatment plants Nitrification 1 Nitrification and denitrification 1 Nitrogen removal 1 Sewage pumping plants 1 Sewage treatment plants 1 Total nitrogen removal 1 Wastewater treatment 1 Wastewater treatment plants 1 Water recycling 1 Water treatment plants 1 activated sludge 1 caffeine 1 concentration (parameter) 1 controlled study 1 degradation 1