New Techniques of wastewater Management

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  1. 1. By Ravish Kumar 1EW09CV053 Under the Guidance of Mr. Nagraj Gupta MS Associate Professor Dept. of Civil Engineering East West Institute of Technology Bangalore-560091 New Techniques of wastewater Management
  2. 2. What is wastewater management?  Wastewater management is the process by which all waste water (waste from showers, toilets, sinks, both residential and most commercial) is treated and returned back to a receiving stream for reuse.
  3. 3. Source of wastewater Home agricultural Industrial
  4. 4. Methodlogy Ion Exchange Reverse osmosis Distillation Electro Coagulation
  5. 5. Ion exchange  Ion exchange is an exchange of ions between two electrolytes or between an electrolyte solution and a complex.  It is used to denote the processes of purification, separation, and decontamination of aqueous and other ion-containing solutions with solid polymeric or mineralic 'ion exchangers'.
  6. 6. Electrocoagulation: New method in wastewater treatment  Electrocoagulation is an advanced and economical water treatment technology. It effectively removes suspended solids to sub-micrometre levels  Electrocoagulation is the process of destabilizing suspended, emulsified, or dissolved contaminants in an aqueous medium by introducing an electrical current into the medium.
  7. 7. Requirements of EC  EC reactor is made up of an electrolytic cell with one anode and one cathode. EC system essentially consists of pairs of conductive metal plates in parallel, which act as monopolar electrodes. It also required sacrificial anodes. The requirements to operate EC are a. Direct current power source b. Resistance Box c. Multimeter
  8. 8. Schematic Diagram
  9. 9. EC setup
  10. 10. Working
  11. 11. Advantages  Removes suspended and colloidal solids  Breaks oil emulsions in water  Removes fats, oil, and grease  Removes complex organics  Destroys and removes bacteria, viruses and cysts  Color removal up to 95%  BOD removal > 60%  COD removal > 70%
  12. 12. Benefits  Supplied as a skid mounted unit, fully assembled for inlet/outlet and backwash connections  Low operating costs  Low power requirements  Minimal chemical additions  Low maintenance
  13. 13. Disadvantages  The ‘sacrificial electrodes’ are dissolved into wastewater streams as a result of oxidation, and need to be regularly replaced.  The use of electricity may be expensive in many places.  High conductivity of the wastewater suspension is required.
  14. 14. Applications  Ground Water Cleanup  Surface Water Cleanup  Sewage Treatment
  15. 15. Reclamation and Reuse of treated water  Irrigation  Industrial use  Recreational uses  Groundwater recharge  Potable reuse
  16. 16. Reverse osmosis  Reverse osmosis (RO) is a water purification technology that uses a semipermeable membrane to remove larger particles from drinking water.  Reverse osmosis can remove many types of molecules and ions from solutions, including bacteria, and is used in both industrial processes and the production of potable water.
  17. 17. Schematic Diagram RO
  18. 18. Distillation  Distillation is a chemical process where a mixture made of two or more liquids (called "components") with different boiling points can be separated from each other.  Distillation is a unit operation of practically universal importance, but it is a physical separation process and not a chemical reaction.
  19. 19. Schematic Diagram Distillation
  20. 20. Reference  Metcalf; Eddy (1972). Wastewater Engineering. New York: McGraw-Hill Book Company.  Kemmer, Frank N. (1979). The Nalco Water Handbook. New York: McGraw-Hill Book Company.  Hammer, Mark J. (1975). Water and Waste-Water Technology. New York: John Wiley & Sons.