Nutrient Removal


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Nutrient Removal

  1. 1. Nutrient R emoval from S laughterhouse W astewater in an I ntermittently A erated S equencing Ba tch R eactor
  2. 2. Outline <ul><li>Introduction </li></ul><ul><li>Method </li></ul><ul><li>1. Laboratory-Scale Sequencing Batch Reactors (SBR) System </li></ul><ul><li>2. Slaughterhouse Wastewater </li></ul><ul><li>3. Operation of the System </li></ul><ul><li>4. Analytical Methods </li></ul><ul><li>Results and Discussions </li></ul><ul><li>1. Overall Performance of the SBR Reactor </li></ul><ul><li>2. Cycle Performance </li></ul><ul><li>Conclusions </li></ul><ul><li>Reference </li></ul>
  3. 3. Introduction <ul><li>Slaughterhouses produce high-strength wastewater. </li></ul><ul><li>The amount of wastewater generated per cow is approximately 2 m 3 per day . </li></ul><ul><li>In pig slaughterhouses, 1.6 – 8.3 m 3 of water per tonne . </li></ul><ul><li>S laughterhouse w astewater can be variable . </li></ul><ul><li>- S uspended S olids (SS) </li></ul><ul><li>- Chemical Oxygen Demand ( COD ) </li></ul><ul><li>- Total Nitrogen ( TN ) </li></ul><ul><li>- Total Phosphorus ( TP ) </li></ul>
  4. 4. Introduction <ul><li>O n-site biological treatment by European Commission </li></ul><ul><li>- R emove O rganic C arbon (C) </li></ul><ul><li>- R emove N utrients </li></ul><ul><li>The European Commission also recommends that Sequencing Batch Reactors (SBRs) be amongst the Best Available Techniques (BATs) for Slaughterhouse wastewater treatment. </li></ul>
  5. 5. Introduction <ul><li>SBRs are capable o f: </li></ul><ul><li>- R emoving organic C </li></ul><ul><li>- R emoving nutrients </li></ul><ul><li>- R emoving SS </li></ul><ul><li>- H ave low capital </li></ul><ul><li>- Low operational costs </li></ul><ul><li>SBRs are not able to remove nitrogen (N) as efficiently as COD. </li></ul><ul><li>Anoxic heterotrophic denitrifiers reduce nitrate-N (NO 3 -N)/nitrite-N (NO 2 -N), which is produced in the preceding operational cycle and remains in the reactor after the draw phase, to nitrogen gas (N 2 ) </li></ul>
  6. 6. Introduction <ul><li>P accumulating organisms (PAOs) will compete with denitrifiers for rbCOD for anaerobic P release. </li></ul><ul><li>A conventionally operated SBR can be changed to an intermittently aerated SBR, where one complete operational cycle comprises four phases – fill, react, settle and draw. </li></ul><ul><li>If the DO in the reactor tank is controlled properly by means of intermittent aeration, NH 4 -N will be partially oxidized to NO 2 -N and then in the mixing period, NO 2 -N will be reduced to N 2 gas. </li></ul><ul><li>the performance of a laboratory-scale, intermittently aerated SBR for simultaneous N and P removal from slaughterhouse water was investigated. </li></ul>
  7. 7. Method <ul><li>Laboratory- S cale Sequencing Batch Reactors (SBR) System </li></ul><ul><li>Slaughterhouse W astewater </li></ul><ul><li>Operation of the S ystem </li></ul><ul><li>Analytical M ethods </li></ul>
  8. 8. Method Laboratory- S cale Sequencing Batch Reactors (SBR) System
  9. 9. Method <ul><li>Collected from the conditioning tank in the wastewater treatment plant (WTP) </li></ul><ul><li>Reduce COD and N </li></ul><ul><li>Tertiary treatment (chemical coagulation) </li></ul><ul><li>Reduce P </li></ul><ul><li>The WTP comprises: </li></ul><ul><li>- Preliminary treatment (screening and dissolved air flotation) </li></ul><ul><li>- A conditioning tank </li></ul><ul><li>- Primary treatment (sedimentation) </li></ul><ul><li>- Secondary treatment (conventional activated sludge pre-denitrification process) </li></ul>Slaughterhouse W astewater
  10. 10. Method Operation of the S ystem
  11. 11. Method <ul><li>COD, BOD5 and SS were measured in accordance with the standard APHA methods </li></ul><ul><li>Where: </li></ul><ul><ul><li>TN i is the amount of N (mg) contained in the influent wastewater fed into the reactor tank during the fill phase </li></ul></ul><ul><ul><li>TN o is the amount of N (mg) contained in the effluent wastewater leaving the reactor tank during the draw phase </li></ul></ul><ul><ul><li>TN M is the amount of N (mg) utilized by microorganisms for biomass synthesis </li></ul></ul><ul><ul><li>(TND) i is the amount of N (mg)removed from the reactor tank by means of denitrification in the i th non-aeration stage (i = 1, 2, 3, 4) </li></ul></ul>Analytical M ethods
  12. 12. Results and D iscussions <ul><li>Overall P erformance of the SBR R eactor </li></ul><ul><li>Cycle P erformance </li></ul>
  13. 13. Results and D iscussions Overall P erformance of the SBR R eactor
  14. 14. Results and D iscussions Cycle P erformance
  15. 15. Conclusions <ul><li>At an influent OLR of 1.2 g COD/(L d), average effluent concentrations of COD, TN and TP were 150 mg/L, 15 mg/L and 0.8 mg/L, respectively. This represented COD, TN and TP removals of 96%, 96% and 99%, respectively. </li></ul><ul><li>A nitrogen balance was carried out and showed that 66% of N removed was due to denitrification and 34% was consumed by microorganisms for biomass synthesis. </li></ul><ul><li>Partial nitrification occurred in the system, possibly due to the intermittent aeration pattern employed in the SBR system. 95% of N removal by means of denitrification was via NO2-N. </li></ul>
  16. 16. Reference <ul><li>Nutrient Removal from Slaughterhouse Wastewater in an Intermittently Aerated Sequencing Batch Reactor </li></ul><ul><li>- Bioresource Technology, Volume 99, Issue 16, November 2008, Pages 7644-7650 </li></ul><ul><li>J . P . Li, M . G . Healy, X . M . Zhan, M . Rodgers </li></ul>