• Document: SBTF systems for decentralized sewage treatment in developing countries
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Technological improvements in compact UASB/SBTF systems for decentralized sewage treatment in developing countries T.B. Ribeiro, E.M.F. Brandt, C.A. Díaz, P.G.S. Almeida, C.A.L. Chernicharo Department of Sanitary and Environmental Engineering Federal University of Minas Gerais - Brazil 13th SWWS – Athens – 2016 Introduction Acceptance of the anaerobic technology for domestic sewage treatment - updated Brazilian data  Brazilian urban population (152.6 M inhabitants)  Sample universe: 1439 STPs (73.7 M inhabitants) UASB reactors Treated Population State sewage flow served (m³.s-1) DF 3,3 1.847.850 MG 11,8 6.532.306 SP 6,8 3.284.438 SC 1,5 780.559 RJ 1,7 447.327 ES 0,6 307.343 PR 12,4 6.894.283 BA 2,9 1.600.659 GO 0,6 306.972 MS 1,4 971.280 ∑ 42,8 22.973.017 13th SWWS – Athens – 2016 Introduction UASB and post-treatment in Brazil  Sample universe: 1439 STPs (9 states + Federal District) 637 STPs 13th SWWS – Athens – 2016 Introduction Developing countries • Enormous sanitation deficit • Shortage of financial resources • Lack of qualified personal for operation • Need of low cost, sustainable and simplified sewage treatment systems Combined anaerobic + simple post-treatment systems fit these criteria and can play a major role towards sustainable sewage treatment plants Some alternatives: • UASB + Polishing Ponds • UASB + Wetlands • UASB + Trickling Filters 13th SWWS – Athens – 2016 Introduction The idea behind the proposal UASB + TF system 3 4 Possibility of energy recovery Lower construction costs Central player Lower O&M costs Simple to operate 1 13th SWWS – Athens – 2016 Introduction The idea behind the proposal UASB + SBTF system Removal Parameter Effluent (mg.L-1) 3 efficiency (%) • Reduced sludge management COD < 100 80 – 85 • Proper effluent quality BOD < 40 85 – 90 • Compactness (< 0,03 m²/inhab.) TSS < 40 75 – 80 2 1 NH4+ < 15 60 – 90 E. coli < 1 E05 MPN.100ml-1 > 4,0 log. units 13th SWWS – Athens – 2016 Introduction Current Limitations and Constraints Gas phase  Waste gas o Can be collected and treated (ex. biofilter) Liquid phase  Residual carbon, ammonia and pathogens o Can be removed in the aerobic post-treatment of the liquid phase Solid phase  Scum management o Can be controlled inside the TPS (ex. hydrostatic removal system) 13th SWWS – Athens – 2016 Objective Main objective Present a compact sewage treatment system that incorporates technological improvements matching current constraints Effluent quality improvements with t

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