MBR. Challenge and a new approach

Size: px

Start display at page:

Download "MBR. Challenge and a new approach"

Spencer Crawford
7 years ago
Views:

1 MBR Wastewater treatment plants Wastewater treatment plants Challenge and a new approach

2 - Sensitive area - Highly developed tourist destination - During summer, population increases even 5 times - Great fluctuations in inflow

3 MBR (Membrane BioReactor) technology of wastewater treatment

4 MBR technology of wastewater treatment Schematic diagram of Almes MBR process

5 Oxidation: C 18 H 19 O 9 N + 17,5 O 2 18 CO H 2 O + NH 4 + organic matter Synthesis (microbial growth): C 18 H 19 O 9 N + 0,74 NH 3 + 8,8 O 2 1,74 C 5 H 7 O 2 N + 9,3 CO 2 + 4,52 H 2 O organic matter cell biomass Endogenous respiration: C 5 H 7 O 2 N + 5 O 2 + H + 5 CO H 2 O + NH 4 + cell biomass

6 Nitrification: Denitrification :

7 MBR technology of wastewater treatment STABLE PROCES high effluent quality regardless of influent fluctuations FLEXIBILITY tolerant to 1-7 x hydraulic and organic overload COMPACT DESIGN active sludge concentracion higher than CAS results in smaller bioreactor tanks HIGH EFFLUENT QUALITY HIGH SRT 25 days or more removes even slowly disintegrating BOD HIGH MLSS 8 12 g/l (CAS = 4 5 g/l) LOW F/M great flexibility of organic load LOW SLUDGE PRODUCTION 0,2 0,5 kgmlss/kgbod STABILIZED EXCESS SLUDGE MEMBRANE FOULING reduced with backwashing; maintenance cleaning with higher chemical concentration or intensive chemical cleaning (once or twice a year)

8 Comparison - MBR plant and classic biological plant Municipal waste water Water for reuse Classic biological plant Mechanical cleaning, coarse screen UV disinfection Primary sedimentary basin, aerated sand catchergrease catcher Sand catcher MBR plant Biological treatment of water with active sludge Sedimentation (secondary sedimentary basins) Layout area: Classic biological plant 100% Municipal wastewater Mechanical screening, coarse and fine screen MBR plant Water for reuse MBR plant 33%

9 Quality of treated wastewater with MBR MBR technology = includes tertiary wastewater treatment Parameter Concentration tolerable for emission in recipient of 2 nd category Value achieved with MBR plant Efficiency of MBR plant 1. BOD, (mg O2/l) < 25 < % 2. COD, (mg O2/l) < 125 < % 3. Suspended solids (mg/l) < 35 < % 4. Total P (mg/l) < 1 < 0, % 5. Total N (mg/l) < 21 < % 6. Turbidity (NTU) - < 1 99,9% 7. Bacteria removal (%) - > 99,999 >99,99%

10 Main characteristics of MBR technology general advantages MBR technology belongs to the group of so called Green Technologies MBR plant enables total wastewater management compactness and small ground plan necessary for the construction of plant relatively small size of the plant enables fast construction possibility of underground or surface type of construction, with architectural design in order to fit to the environment costs of plant control are lower than with classical biological wastewater treatment plants

11 Main characteristics of MBR technology technical advantages flexibility regarding maximal and minimal flows within required parameters effluent quality is constant, regardless the influent wastewater small quantity of excess sludge and therewith connected costs excess sludge is mineralized and stabilized simple management of the plant, as a result of high automation and low dependence on the human factor no risk of biomass loss complete bacteria removal removes even slowly disintegrating BOD there is no emission of odors or noise reduces quantity of chemicals for reduction of phosphorus

12 Main characteristics of MBR technology advantage of reuse possibility of reusing the treated wastewater in irrigation purposes or as technological water classified as Class A of reclaimed water, according to EPA (Environmental Protection Agency) according to that classification treated water can be used for highest range of reuse including urban (non-potable) with uncontrolled public access, in agricultural (human food crops consumed raw), industrial (open systems with worker exposure potential) possibility of reusing the treated sewage sludge classified as Class A (with respect to pathogens) in agriculture, but also containerized or bulk, unrestricted use on lawn and garden and composting

13 Estimated cost of MBR units

14 Cost comparison of classic and MBR plants

15 Trends in the world Number of MBR plants in the world (>500 PE) Time Source: Filtration + separation

16 DEVELOPMENT OF MBR TECHNOLOGY IN COMPANY ALMES-EKO 0. analysis of wastewater treatment in year concept for reuse of treated wastewater - analysis of accessible technologies - MBR technology is chosen as the most suitable 1. Research and analysis of integration possibilities in wastewater treatment systems pilot plant in Rijeka MBR 15 PE, 3 m 3 /day, 2004.

17 2. Construction of middle capacity plants: MUNICIPAL WASTEWATER TREATMENT PLANTS: Park Umag MBR 5000 PE, 1000 m 3 /day, reconstruction of the existing system load up to 7000 PE small changes in operational parameters plant is maintaining quality of treated water inside given parameters Crveni Otok MBR 1500 PE, 300 m 3 / day, great oscillations in inflow (daily and summer/winter)

18 Sv. Lovreč MBR 2 x 200 PE Oprtalj MBR 2 x 200 PE Gračišće MBR 260 PE

19 Viškovići MBR 130 PE Vrhovine MBR 1200 PE

20 Community of Perušić MBR 2 x 600 PE Lovinac MBR 600 PE Prhati MBR 2 x 200 PE Aligned with the architecture of the region

21 LANDFILL WASTEWATER TREATMENT PLANT: Lokva Vidotto MBR PE, 30 m 3 / day, leachate high COD, ammonium and metals INDUSTRIAL WASTEWATER TREATMENT PLANT: Kanfanar MBR 2000 PE, 450 m 3 / day, tobacco industry industrial and municipal waters are treated at the same time Cromaris fish industry

22 TREATMENT OF DRINKING WATER: Sv. Ivan Gradole

23 TREATMENT OF DRINKING WATER: Bužini i Gabrijeli Other plants under designig proces or construction

24 Conclusion MBR plant can always achieve quality of wastewater required by law Number of MBR plants in the world is constantly growing MBR technology is constantly developing, while M&O cost is decreasing MBR technology is the most suitable technology for wastewater treatment

MEMBRANE TECHNOLOGY TREATING OILY WASTEWATER FOR REUSE

MEMBRANE TECHNOLOGY TREATING OILY WASTEWATER FOR REUSE Jeff Peeters, P.Eng. ZENON Environmental Inc. SAWEA 2005 Workshop Al-Khobar Holiday Inn Hotel, Saudi Arabia November 29, 2005 Presentation outline