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Sewage Treatment and Recycle

Sewage Treatment and Recycle. What is sewage?. Sewage is the wastewater originating in homes from Kitchen Laundry Wash Basins Bath rooms & Toilets Floor Wash In one word, it is all the wastewater that comes out of homes / human use. When you flush the toilet where does the contents go?.

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Sewage Treatment and Recycle

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  1. Sewage Treatment and Recycle

  2. What is sewage? Sewage is the wastewater originating in homes from • Kitchen • Laundry • Wash Basins • Bath rooms & Toilets • Floor Wash In one word, it is all the wastewater that comes out of homes / human use

  3. When you flush the toilet where does the contents go? Where does it all go! Where does the water from the washer go? By gravity flow, the waste is on its way to your local wastewater treatment plant!

  4. Sewage composition …. • Solids like vegetable peelings, rice, plastic covers etc • Oil & Grease from Kitchen / Laundry • Suspended solids from kitchen • Chemicals from detergents • Mild colors from laundry / food • Pathogenic microbes from fecal matter Physical impurities, dissolved chemical impurities & Microbiological impurities

  5. Wastewater Composition 99.95% Water + 0.05% Impurities

  6. Why treat wastewater? ?

  7. Hazards of wastewater? • 34 Lakh children die every year due to water borne diseases. 99% of this are from developing countries • That is every one child every 21 seconds • Water borne diseases originate from human execrate

  8. Un-treated Sewage is a time bomb that can’t be de-fused !!!

  9. Why treat wastewater? • Causes a demand for dissolved oxygen (lowers DO levels of streams) • Adds nutrients (nitrate and phosphate) that cause excessive growth • Stinks otherwise • Increases suspended solids or sediments in streams (turbidity increase) • To comply with Environmental norms

  10. Less than 10%of the sewage only is treated

  11. How is Sewage treated?

  12. Levels of Treatment Primary • removal by physical separation of grit and large objects (material to landfill for disposal) Secondary • aerobic microbiological process (sludge) organic matter + O2 CO2 + NH3 + H2O NH3 NO3- • lowers suspended solids content (into sludge) Mostly dead microbes aquatic nutrient

  13. Secondary process To tertiary process From primary process Settling collects sludge on bottom air diffuser • Aeration and rapid mixing

  14. Levels of Treatment continued Tertiary (advanced) • anaerobic microbiological process with a different microbe where O2 is toxic (more sludge) NO3-  N2 (escapes to atmosphere) • PO4-3 if not removed in sludge in secondary process PO4-3 + Al+3 AlPO4 (s) (into sludge) - aeration to strip N2 and re-oxygenate (add DO)

  15. Tertiary process From secondary process add methanol as food source Effluent Settling collects sludge on bottom • Slow mixing • to keep suspended and O2 out

  16. When the treatment is done… • Effluent back to stream after • Chlorination / de-chlorination and • a final carbon filtration • For re-use advanced filtration methods Ultra-Filtration • Sludge – very nutrient rich • applied directly to land as fertilizer • incinerated (good fuel after drying) • composted (good manure)

  17. Why Recycle Sewage? ?

  18. Treated Sewage is the most reliable source of water

  19. Packaged Sewage Treatment Plants 5, 10, 15, 20, 25, 30, 40, 50, 75, 100, 125 & 150 KLD

  20. Custom Designed STP 50 KLD & Above

  21. Sewage Recycling Plants (UF)25, 50, 75, 100KLD & Custom Designed

  22. Zero Discharge STP &Effluent Treatment Plants

  23. Contact us… PLOT NO. 201/7 PHASE-II IDA CHERLAPALLY, HYDERABAD- 051 Hyderabad | Bangalore | Bhopal Customer Care: 080-6134 4798 www.modernstp.com sales@modernstp.com Blog: waterblog.in

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