Technical calculations for the biological treatment plant


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presentation on the technology transfer of waste water treatment from Germany to Asia (case study Chennai, India) at the University of applied sciences Berlin in 2010

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Technical calculations for the biological treatment plant

  1. 1. Presented by: Alex Tagbo Shashank Giridhar Sunil Kumar 1
  2. 2. Type of wastewater treatment plant This plant is a decentralized one since chennai is a very large city. The plant is designed to serve 55000 people. It is a pilot project and its main purpose is research and development. The water from the plant is sent to the river or could later be processed to drinking water. 2
  3. 3. Principles of biological elimination of pollution Elimination of organic matter org. C + O2 →Biomass + CO2 +H2O Nitrification NH4 →NO3 / NO2 Denitrification NO3 / NO2→N2 3
  4. 4. Technical realization of the principle In the first process we eliminate carbon. The second step is the nitrificaton process where ammonia is converted into nitrogen di- oxide and nitrogen tri-oxide. The next stage is the denitrification process, where nitrogen di-oxide and tri-oxide are converted into nitrogen gas. 4
  5. 5. ATV 131 ATV means Abwassertechnische Vereinigung that is wastewater technical association in English. Using ATV 131, we can meet the achievable minimum effluent requirement which correspond with the requirements of the of the German waste water ordinance. 5
  6. 6. Main objective of ATV 131 Technical regulations for the selection of the most practical procedure for carbon, nitrogen and phosphorous removal and for the dimensioning of the essential components and facilities of the plant. 6
  7. 7. Allgemeine Abwasser Verwaltungvorschrift uber die Mindestanforderungen an das Einleiten von Abwasser in Gewasser . English translation of the above sentence is “Administrative rules concerning the discharge of waste water into water bodies based on minimum requirements”. 7
  8. 8. Procedure for planning and dimensioning using ATV Design criteria : flow rates and loads for different design cases,effluent requirements Other design constraints : area,subsoil,hyraulics etc Selection of the process,required sludge age,assumption of sludge volume index Design of the secondary settling tank Design of the biological reactor Optimum matching of reactor and settling tank Optimised solution End of dimensioning 8
  9. 9. Reactor constructions for biological nitrogen removal Post denitrification process Post aeration Organic carbon → Nitrification → D → →•The process is employed if the waste water has a low C/N ratio.•The denitrification tank is downstream from the nitrification tank. 9
  10. 10. Pre-anoxic zone denitrification process →→ → → Denl. Nitrification Internal recirculation Secondary settling Return sludge tank•Waste water, return sludge and internal recirculation flow are mixed in the denitrification tank. 10
  11. 11. Phosphorous Elimination → →→ →→Anaerobic mixing tank secondary settling tankAdenosine tri phosphate is broken down into adenosine di phosphate and adenosine mono phosphate. 11
  12. 12. Specification table CSB BSB Inorganic P NitrogenRaw water dirt 120 60 11 2.5Concentration 400-1000 200-500 40-90 10-20 mg/l Required quality <1000 EW 150 401000-5000 EW 110 25 5000-20000 90 20 1820000-100000 90 20 18 2 >100000 75 15 18 1 12
  13. 13. Differences between German and Indian standards 13
  14. 14. 14
  15. 15. Summary of calculation for A-131 Documentation of the project. Size class and treatment objectives. Specification of the process concerning the technical realization. Overview and selection of loads. Dimensioning loads, flow rates, concentrations, peak factors. 15
  16. 16.  Loading with the lowest temperature. Loading with the highest temperature. Selecting the type of sludge thickening, return sludge and inflow secondary settling. Dimensioning of the tank. Details of the rotating blade scraper. Specifications related to nitrogen balance. 16
  17. 17.  Details regarding phosphorous removal. Dimensions of activated sludge tank. Operation specifications with lowest temperature. Operation specifications with highest temperature. Oxygen demand specifications. Alkalinity 17
  18. 18. Important technical aspects of technology transfer Influence of the volume of basin depending on the size of inhabitants. Dependence of volume of basin on produced waste water per inhabitant per day. Influence of temperature on the volume of the basin 18
  19. 19. Influence of the volume of basindepending on the size of inhabitants Graph of Number of inhabitants Vs Loading 19
  20. 20. Graph of Total volume of the basin Vs Number ofinhabitants 20
  21. 21. Dependance of volume of basin on produced waste water per inhabitant per day 21
  22. 22. 22
  23. 23. Influence of temperature on the volume of the basin 23
  24. 24. Membrane technology Membrane technology utilizes a semipermeable membrane for the separation of suspended and dissolved solids from water. There are two basic types of membrane separation processes; pressure-driven and electrically-driven.
  25. 25.  Pressure-driven processes use hydraulic pressure to force water molecules through the membranes. In the electrically-driven membrane process, electric current is used to move ions across the membrane.
  26. 26. Types of pressure driven membranes
  27. 27.  Settlement tanks are not required if membrane technology is used, hence the space required will be less. Settlement Tanks are a limiting factor for the concentration for biomass in the aeration basin. The used basin volume for 100000 inhabitants without membrane technology is 36653m3 , whereas with membrane technology it is 18462m3 .
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