1 / 26

Dr.- Ing. Rainer-Werner Abendt Nuremberg Contact: rainer.abendt@gmx.de

Wastewater Workshop in Nairobi 29-th August till 03-rd September 2011. Sewer Systems. Dr.- Ing. Rainer-Werner Abendt Nuremberg Contact: rainer.abendt@gmx.de. Sewer Systems. A Recap of the previous module indicated that:-

brent
Download Presentation

Dr.- Ing. Rainer-Werner Abendt Nuremberg Contact: rainer.abendt@gmx.de

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Wastewater Workshop in Nairobi 29-th August till 03-rd September 2011 Sewer Systems Dr.- Ing. Rainer-Werner Abendt Nuremberg Contact: rainer.abendt@gmx.de

  2. Sewer Systems A Recap of the previous module indicated that:- Sewage purification systems are necessary for health. Because supply of clean water to the population is indispensable for health provision. (National Water Services) But sewage systems are also important for protection of groundwater or river water. Why? Because we need river or ground water to produce drinking water !

  3. Sewer Systems Sources of raw water in Bavaria

  4. Effluent Standards (emission) Water Quality Standards (imission) Education Standards: labours and academic Health and Safety Standards 1 2 Sewer Systems 1 2 4 3 4 3

  5. Evolution in sewer network:- By-laws -auslässe Legal Orders Urban area Evolution of water crowd: - Sewer construction Evolution of Water quality: - Sewer operation Sewer Systems First step! Without Stormwater Drainage Treatment plant

  6. -auslässe -auslässe Legal Orders Legal Orders Sewer Systems Or First step! With separate Stormwater Drainage Evolution in sewer network:- By-laws Effluent in a river Urban area (What will be Water quality of the effluent that we will dispose into the river?) Treatment plant Evolution of water crowd: - Sewer construction Evolution of Water quality: - Sewer operation

  7. Evolution in sewer network:- By-laws -auslässe -auslässe Legal Orders Legal Orders Urban area Evolution of water crowd: - Sewer construction Stormwater Effluents Evolution of Water quality: - Sewer operation Sewer Systems Or First step! Storm- and Wastwater mixed Are the stormwater drains connected to the trunk sewer? If not, where does the stormwater drain to? Treatment plant

  8. Administration: Finances; Personnel By-laws: Connection approval;Industrial monitoring;Cost covering Wastewater disposal (Discharge and treatment) Sewer construction: General drainage;Sewer network expansion; Sewer operation: Maintenance, repair, operation/control of storage space and outlets (provisions under water law) Sewer Systems

  9. Sewer Systems • Pipe Varieties in Nuremberg, Germany. These are examples of types of pipes needed for various transmission works In selecting a pipe material for sewer service, the design engineer must evaluate standards for materials, products and systems The standards must meet international specifications and must have passed Proficiency Testing Programs for quality assurance.

  10. Product &Testing Standards guarantee quality. • Check the:- • pipe diameter • Pipe Material • Pipe thickness Sewer Systems Technical Standards of Materials

  11. DEN = Technical European Norms First WASPA Annual International Conference 8-9th September 2011, KICC Grounds, Nairobi, Kenya Free trade

  12. Sewer Systems Examples of Standards Quality of on Water Materials: • CEN TC 155 „Plastics piping systems“ “ • CEN TC 163 „Sanitary appliances “ • CEN TC 164 „Water supply “ • CEN TC 165 „Waste Water Engineering“ • CEN TC 203 „Cast iron pipes “ • CEN TC 208 „Elastomeric seals“ • CEN TC 230 „Water analysis “ • CEN TC 308 „Characterization of sludges“

  13. Sewer Systems Example: ‘Visual inspection coding system,

  14. Wastewater types (QWW): 1. Domestic wastewater (QD) such as: shower water swimming pool water flushing water faecal water 2. Commercial and/or industrial wastewater (QInd) such as: production water treatment water cooling water 3. Infiltration water (QIW) 4. Stormwater (rainfall) (QR) 5. Melt water Daily amount of wastewater, normal in Europe: average: 125 - 200 l / (per individuaI per day) frequently: > 300 l / (per individual per day) due to increased amounts of infiltration water (QIW) Sewer Systems

  15. Parameters in Wastewater pollution (raw sewage): Inhabitant-related loads in raw wastewater BOD5: 60 g/(per Individual per day) COD: 120 g/(per Individual perday) filterable solids: 70 g/(per individual per day) Ptot: 1.8 g/(per individual per day) Ntot: 11 g/(per individual per day) Ntotin raw wastewater mainly as TKN TKN (Total Kjeldahl Nitrogen): Norg + (NH4+- N) undissolved matter: 30 % dissolved matter: 70 % Sewer Systems

  16. Wastewater pollution (raw sewage): Concentrations of minimum parameters in domestic raw wastewater: BOD5: 200 - 400 mg/l COD: 400 - 800 mg/l Ptot: 5 - 12 mg/l Ntot: 30 - 75 mg/l Sewer Systems

  17. The wastewater discharged into the sewer system should not possess the following characteristics: 1. Free acids (pH values < 6.5) and strong lyes (pH > 8.5) 2. Salts in high concentrations 3. Strong poisons (toxic substances, e.g. Cu ions) 4. Oils and greases (mineral oils) 5. Hazardous and explosive gases (e.g. methane, petrol fumes) 6. Odorous substances (e.g. sulphides from leather processing) 7. Large quantities of suspended or heavy settleable solids 8. Radioactive substances (e.g. from hospitals) 9. High Temperatures (over 35 °C) 10. Heavy discoloration (e.g. from the textile processing industry) Sewer Systems

  18. Q [ l / s ] % Q 2 0 0 K W 1 9 0 1 8 0 1 7 0 1 6 0 R e s e r v e f ü r 1 5 0 R e g e n w a s s e r , Q 1 4 0 1 3 0 1 2 0 1 1 0 1 0 0 9 0 S c h m u t z w a s s e r 8 0 Q S W 7 0 6 0 5 0 4 0 3 0 2 0 F r e m d w a s s e r 1 0 Q 0 t [ h ] 5 . 0 0 9 . 0 0 1 3 . 0 0 1 7 . 0 0 2 1 . 0 0 1 . 0 0 5 . 0 0 Sewer Systems The daily variation of waste water % Pipe capacity for stormwater R W Wastewater Infiltration Water F W

  19. Cost Reduction: You can reduce your treatment costs, if you ensure non-soiled wastewater does reach the sewer network at all. In a mixed sewer net (rain and wastewater) you can reduce your costs by building a storm water tank at a quarter the distance from the start of the trunk sewer with a drain time of 10 to 15 minutes in the channel. Sewer Systems

  20. Sewer Systems Sewer network of Nuremberg Treatment plants Sewer network Stormwater tank

  21. Sewer Systems Schematic profile

  22. Sewer Systems Diagram

  23. Sewer Systems Water quality of the river

  24. Why Sewage Purification ? Demands on water quality (Europe): COD Ntot Ammonia BOD5 Suspended Solid Ptot

  25. Administration Legal orders Financial management Personnel Documentation Automatic monitoring Product 1 „Clean Water" Treatment plant (Process system) Product 2 "Sludge" Secure disposal Legal orders Demands on the sludge Laboratory operating data Sewer Systems Evolution in sewer network:- By-laws ? Government control Urban area Evolution of water crowd: - Sewer construction Evolution of Water quality: - Sewer operation

  26. How then does a Treatment Plant look like ? Sewer Systems

More Related