Nutrient Removal
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Nutrient Removal

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    Nutrient Removal Nutrient Removal Presentation Transcript

    • Nutrient R emoval from S laughterhouse W astewater in an I ntermittently A erated S equencing Ba tch R eactor
    • Outline
      • Introduction
      • Method
      • 1. Laboratory-Scale Sequencing Batch Reactors (SBR) System
      • 2. Slaughterhouse Wastewater
      • 3. Operation of the System
      • 4. Analytical Methods
      • Results and Discussions
      • 1. Overall Performance of the SBR Reactor
      • 2. Cycle Performance
      • Conclusions
      • Reference
    • Introduction
      • Slaughterhouses produce high-strength wastewater.
      • The amount of wastewater generated per cow is approximately 2 m 3 per day .
      • In pig slaughterhouses, 1.6 – 8.3 m 3 of water per tonne .
      • S laughterhouse w astewater can be variable .
      • - S uspended S olids (SS)
      • - Chemical Oxygen Demand ( COD )
      • - Total Nitrogen ( TN )
      • - Total Phosphorus ( TP )
    • Introduction
      • O n-site biological treatment by European Commission
      • - R emove O rganic C arbon (C)
      • - R emove N utrients
      • The European Commission also recommends that Sequencing Batch Reactors (SBRs) be amongst the Best Available Techniques (BATs) for Slaughterhouse wastewater treatment.
    • Introduction
      • SBRs are capable o f:
      • - R emoving organic C
      • - R emoving nutrients
      • - R emoving SS
      • - H ave low capital
      • - Low operational costs
      • SBRs are not able to remove nitrogen (N) as efficiently as COD.
      • 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 )
    • Introduction
      • P accumulating organisms (PAOs) will compete with denitrifiers for rbCOD for anaerobic P release.
      • 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.
      • 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.
      • the performance of a laboratory-scale, intermittently aerated SBR for simultaneous N and P removal from slaughterhouse water was investigated.
    • Method
      • Laboratory- S cale Sequencing Batch Reactors (SBR) System
      • Slaughterhouse W astewater
      • Operation of the S ystem
      • Analytical M ethods
    • Method Laboratory- S cale Sequencing Batch Reactors (SBR) System
    • Method
      • Collected from the conditioning tank in the wastewater treatment plant (WTP)
      • Reduce COD and N
      • Tertiary treatment (chemical coagulation)
      • Reduce P
      • The WTP comprises:
      • - Preliminary treatment (screening and dissolved air flotation)
      • - A conditioning tank
      • - Primary treatment (sedimentation)
      • - Secondary treatment (conventional activated sludge pre-denitrification process)
      Slaughterhouse W astewater
    • Method Operation of the S ystem
    • Method
      • COD, BOD5 and SS were measured in accordance with the standard APHA methods
      • Where:
        • TN i is the amount of N (mg) contained in the influent wastewater fed into the reactor tank during the fill phase
        • TN o is the amount of N (mg) contained in the effluent wastewater leaving the reactor tank during the draw phase
        • TN M is the amount of N (mg) utilized by microorganisms for biomass synthesis
        • (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)
      Analytical M ethods
    • Results and D iscussions
      • Overall P erformance of the SBR R eactor
      • Cycle P erformance
    • Results and D iscussions Overall P erformance of the SBR R eactor
    • Results and D iscussions Cycle P erformance
    • Conclusions
      • 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.
      • 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.
      • 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.
    • Reference
      • Nutrient Removal from Slaughterhouse Wastewater in an Intermittently Aerated Sequencing Batch Reactor
      • - Bioresource Technology, Volume 99, Issue 16, November 2008, Pages 7644-7650
      • J . P . Li, M . G . Healy, X . M . Zhan, M . Rodgers