logging in or signing up sewage water treatment rajasreekar Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 6109 Category: Science & Tech.. License: All Rights Reserved Like it (16) Dislike it (1) Added: January 16, 2010 This Presentation is Public Favorites: 7 Presentation Description 3 types of sewage water treatment include sludge method,aeration tank,anaerobic digesters etc Comments Posting comment... By: princekrishna (2 month(s) ago) This is excellent & very useful.Pl. send me a copy to my Mail: vestenviro@gmail.com Saving..... Post Reply Close Saving..... Edit Comment Close By: sinha.mayuri8 (2 month(s) ago) The presentation is excellent.i need it by tommorow.can you please mail me at sinha.mayuri8@gmail.com. Thankyou! Saving..... Post Reply Close Saving..... Edit Comment Close By: Leaba (2 month(s) ago) please send me the slide nleaba@gmail.com this is useful to me Saving..... Post Reply Close Saving..... Edit Comment Close By: vat77 (5 month(s) ago) pl send me a copy thampyvj77@gmail.com Saving..... Post Reply Close Saving..... Edit Comment Close By: vigneshjayanth (7 month(s) ago) This is very useful to me, please email me at vigneshjayanth00@gmail.com.Thanks! Saving..... Post Reply Close Saving..... Edit Comment Close loading.... See all Premium member Presentation Transcript SEWAGE WATER TREATMENT : SEWAGE WATER TREATMENT BY Raja sreekar p microbiologist Sewage : Sewage Waste water often contain high levels of organic matter from industrial, agricultural and human wastes. Sewage is a collection of all domestic, industrial and storm-water run-off. The treatment of human waste-impacted waters, with many pathogens that may be present is very important. Wastewater : Wastewater Defined combination of liquid or water carried wastes removed from residences, institutions, and commercial and industrial establishments. If left untreated, can spread diseases. B O D : B O D Efficiency is expressed in terms of reduction of BOD. BOD – biochemical oxygen demand – amounts of dissolved oxygen consumed by microorganisms. The dissolved oxygen content of the sample,with or with out dilution, is measured before n after incubation at 20 o c for 5 days. Sewage treatment : Sewage treatment Use of modern sewage treatment, together with chlorination has led to major reduction in the world wide spread of pathogens. Sewage treatment involves Primary Secondary and Tertiary treatment. Major steps in the treatment of wastes : Major steps in the treatment of wastes Primary Treatment Involves removal of insoluble particulate materials by screening addition of alum addition of other coagulation agents physical procedures Primary Treatment…. : Primary Treatment…. Primary treatment can physically remove 20-30% of the BOD that is present in particulate form. Settleable solid materials are removed by holding the sewage in sedimentation units( tanks n basins) The resulting solid material from the primary treatment is called sludge. Secondary Treatment : Secondary Treatment Involves biological removal of dissolved organic matter. About 90-95% of the remaining BOD and many bacterial pathogens are removed by this process. Various techniques are involved. All involve similar microbial activities. Secondary treatment... : Secondary treatment... Involves Trickling filters Activated sludge method Lagoons Extended aeration systems Anaerobic digesters Trickling filters : Trickling filters The waste effluent is passed over rocks or other solid materials upon which microbial films have developed. Microbial community in these films degrades organic waste. Passage of waste water through the filter causes the development of zoogleal film (bacteria, protozoa etc.) Organisms in Trickling filters : Organisms in Trickling filters Zooflagellates (Mastigophorans) Especially in highly loaded systems Amoebae Different species in different systems Ciliates Nematoda Diatoms Activated sludge method : Activated sludge method Involves horizontal flow of material with a recycle of sludge Sludge is the active biomass formed when organic matter is degraded and oxidized by microorganisms. Activated sludge method : Activated sludge method Two systems Low rate system: Low nutrient input/ unit of microbial biomass. Produce good quality effluent. High rate system: High nutrient input/ unit of microbial biomass. Produce poor quality effluent. Slide 16: Aerobic secondary sewage treatment - Activated sludge and Trickling filter. Lagoon Systems : Lagoon Systems Shallow basins which hold wastewater for several months to allow natural degradation of sewage Relies heavily on interaction of sunlight, algae, microorganisms and oxygen AERATION SYSTEM : AERATION SYSTEM Anaerobic digestion of wastes : Anaerobic digestion of wastes To reduce the bulk of sewage sludge or microbial biomass formed in aerobic treatment systems. Sludge from aerobic sewage treatment together with materials settled out in primary treatment are further treated by anaerobic digestion. Anaerobic digesters are large fermentation tanks designated to operate anaerobically with continuous input of untreated sewage and removal of final stabilized sludge product Anaerobic digestion : Anaerobic digestion Involves 3 steps Fermentation of sludge components to form organic acids, including acetate. Production of methanogenic substrates: Acetate CO2 and Hydrogen Methanogenesis by methane producers. The resulting methane is removed by a vent at the top of the tank. Advantages of anaerobic digesters : Advantages of anaerobic digesters Most of the microbial biomass produced in aerobic growth is used for methane production. Sludge occupies less volume and can be dried easily. Disadvantages Accumulation of heavy metals and other environmental contaminants in sludge. Tertiary treatment : Tertiary treatment Most complete method of treating sewage but not widely adopted Expensive Wastewater is nutrients removed completely that it is unable to support growth. Tertiary (Advanced) Treatment : Tertiary (Advanced) Treatment Beginning to become more poular due to water shortages and the need for water reuse. Remove Nutrients Ammonia Stripping (sour water stripping) Denitrification Phosphate Precipitation Remove Dissolved Solids Reverse Osmosis Electrodialysis REFERENCES : REFERENCES BOOK BIO-TEHNOLOGY AUTHOR W.CRUEGER & A.CRUEGER EDITION SECOND YEAR 2005 PAGE NO 317-320 BOOK INDUSTRIAL MICROBIOLOGY AUTHOR A.H. PATEL EDITION SECOND YEAR 2008 PAGE NO 236-249 WWW.poweredtemplates.com www.faculty.ksu.edu.sa www.wikipedia.com You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
sewage water treatment rajasreekar Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 6109 Category: Science & Tech.. License: All Rights Reserved Like it (16) Dislike it (1) Added: January 16, 2010 This Presentation is Public Favorites: 7 Presentation Description 3 types of sewage water treatment include sludge method,aeration tank,anaerobic digesters etc Comments Posting comment... By: princekrishna (2 month(s) ago) This is excellent & very useful.Pl. send me a copy to my Mail: vestenviro@gmail.com Saving..... Post Reply Close Saving..... Edit Comment Close By: sinha.mayuri8 (2 month(s) ago) The presentation is excellent.i need it by tommorow.can you please mail me at sinha.mayuri8@gmail.com. Thankyou! Saving..... Post Reply Close Saving..... Edit Comment Close By: Leaba (2 month(s) ago) please send me the slide nleaba@gmail.com this is useful to me Saving..... Post Reply Close Saving..... Edit Comment Close By: vat77 (5 month(s) ago) pl send me a copy thampyvj77@gmail.com Saving..... Post Reply Close Saving..... Edit Comment Close By: vigneshjayanth (7 month(s) ago) This is very useful to me, please email me at vigneshjayanth00@gmail.com.Thanks! Saving..... Post Reply Close Saving..... Edit Comment Close loading.... See all Premium member Presentation Transcript SEWAGE WATER TREATMENT : SEWAGE WATER TREATMENT BY Raja sreekar p microbiologist Sewage : Sewage Waste water often contain high levels of organic matter from industrial, agricultural and human wastes. Sewage is a collection of all domestic, industrial and storm-water run-off. The treatment of human waste-impacted waters, with many pathogens that may be present is very important. Wastewater : Wastewater Defined combination of liquid or water carried wastes removed from residences, institutions, and commercial and industrial establishments. If left untreated, can spread diseases. B O D : B O D Efficiency is expressed in terms of reduction of BOD. BOD – biochemical oxygen demand – amounts of dissolved oxygen consumed by microorganisms. The dissolved oxygen content of the sample,with or with out dilution, is measured before n after incubation at 20 o c for 5 days. Sewage treatment : Sewage treatment Use of modern sewage treatment, together with chlorination has led to major reduction in the world wide spread of pathogens. Sewage treatment involves Primary Secondary and Tertiary treatment. Major steps in the treatment of wastes : Major steps in the treatment of wastes Primary Treatment Involves removal of insoluble particulate materials by screening addition of alum addition of other coagulation agents physical procedures Primary Treatment…. : Primary Treatment…. Primary treatment can physically remove 20-30% of the BOD that is present in particulate form. Settleable solid materials are removed by holding the sewage in sedimentation units( tanks n basins) The resulting solid material from the primary treatment is called sludge. Secondary Treatment : Secondary Treatment Involves biological removal of dissolved organic matter. About 90-95% of the remaining BOD and many bacterial pathogens are removed by this process. Various techniques are involved. All involve similar microbial activities. Secondary treatment... : Secondary treatment... Involves Trickling filters Activated sludge method Lagoons Extended aeration systems Anaerobic digesters Trickling filters : Trickling filters The waste effluent is passed over rocks or other solid materials upon which microbial films have developed. Microbial community in these films degrades organic waste. Passage of waste water through the filter causes the development of zoogleal film (bacteria, protozoa etc.) Organisms in Trickling filters : Organisms in Trickling filters Zooflagellates (Mastigophorans) Especially in highly loaded systems Amoebae Different species in different systems Ciliates Nematoda Diatoms Activated sludge method : Activated sludge method Involves horizontal flow of material with a recycle of sludge Sludge is the active biomass formed when organic matter is degraded and oxidized by microorganisms. Activated sludge method : Activated sludge method Two systems Low rate system: Low nutrient input/ unit of microbial biomass. Produce good quality effluent. High rate system: High nutrient input/ unit of microbial biomass. Produce poor quality effluent. Slide 16: Aerobic secondary sewage treatment - Activated sludge and Trickling filter. Lagoon Systems : Lagoon Systems Shallow basins which hold wastewater for several months to allow natural degradation of sewage Relies heavily on interaction of sunlight, algae, microorganisms and oxygen AERATION SYSTEM : AERATION SYSTEM Anaerobic digestion of wastes : Anaerobic digestion of wastes To reduce the bulk of sewage sludge or microbial biomass formed in aerobic treatment systems. Sludge from aerobic sewage treatment together with materials settled out in primary treatment are further treated by anaerobic digestion. Anaerobic digesters are large fermentation tanks designated to operate anaerobically with continuous input of untreated sewage and removal of final stabilized sludge product Anaerobic digestion : Anaerobic digestion Involves 3 steps Fermentation of sludge components to form organic acids, including acetate. Production of methanogenic substrates: Acetate CO2 and Hydrogen Methanogenesis by methane producers. The resulting methane is removed by a vent at the top of the tank. Advantages of anaerobic digesters : Advantages of anaerobic digesters Most of the microbial biomass produced in aerobic growth is used for methane production. Sludge occupies less volume and can be dried easily. Disadvantages Accumulation of heavy metals and other environmental contaminants in sludge. Tertiary treatment : Tertiary treatment Most complete method of treating sewage but not widely adopted Expensive Wastewater is nutrients removed completely that it is unable to support growth. Tertiary (Advanced) Treatment : Tertiary (Advanced) Treatment Beginning to become more poular due to water shortages and the need for water reuse. Remove Nutrients Ammonia Stripping (sour water stripping) Denitrification Phosphate Precipitation Remove Dissolved Solids Reverse Osmosis Electrodialysis REFERENCES : REFERENCES BOOK BIO-TEHNOLOGY AUTHOR W.CRUEGER & A.CRUEGER EDITION SECOND YEAR 2005 PAGE NO 317-320 BOOK INDUSTRIAL MICROBIOLOGY AUTHOR A.H. PATEL EDITION SECOND YEAR 2008 PAGE NO 236-249 WWW.poweredtemplates.com www.faculty.ksu.edu.sa www.wikipedia.com