Sewage Treatment System Performance Summary

					                                       Malabar sewage treatment plant (STP)
                                          Summary of STP performance
                           (includes flows from Liverpool, Glenfield and Fairfield STPs)


          Treatment plant performance 2007-08


                                                               Performance summary

            Concentration limits                Toxicity limit             Load limits                          General
            All concentration limits            Toxicity limit met.        All load limits met.                 STP performed well.
            met.


                               Discharge load                                                           Discharge volume

                                    Load limit           Load                       Volume of treated                     185,415 million
                 Analyte
                                     (tonnes)          (tonnes)                     wastewater discharged                 litres
               Total                                                                to receiving water
            suspended              47,632.500         27,508.587
              solids                                                           Note: Volume includes wet and dry weather discharges but
            Biological                                                         does not include treated wastewater used for recycled water
                                   58,217.500         38,204.663               schemes.
          oxygen demand
           Total nitrogen          13,231.250         7,669.426
                                                                                                        Toxicity result
                   Total
                                    2,646.250         1,378.110
                phosphorus
                                                                                                                          Average              Average
           Oil and grease           9,261.875         5,475.372                                            Unit of
                                                                                      Measure
                                                                                                          measure
                                                                                                                                limit          actual
          Note: Loads also include discharges during wet weather
                                                                                Sea urchin - 1hr
                                                                                                 % effluent                     0.19            2.016
                                                                                  fertilization

                                                                               Note: Licence requires actual to be greater than the limit.




                                                               Annual discharge load




10000                     Loads         Load Limit                          60000
 9000                                                                                                           Loads             Load Limit
                                                                            50000
 8000
 7000                                                                       40000
 6000
                                                                            30000
 5000
 4000                                                                       20000
 3000
 2000                                                                       10000
 1000
                                                                               0
    0
                                                                                        03-04           04-05           05-06             06-07          07-08
        03-04          04-05         05-06           06-07        07-08
                                                                                                Total Suspended Solids Load Discharged (tonnes)
                 Total Oil & Grease Load Discharged (tonnes)
                                                    Key to box plots




                                         Annual discharge concentration




                  Suspended solids                                        Oil and grease


Note: Concentrations refer to the primary discharge point




                                             Summary information
  Level of treatment and discharge location: Malabar STP is a primary treatment plant
  discharging treated wastewater to the ocean via a deepwater ocean outfall. The outfall discharges
  3.6 km from the shoreline at 82 m maximum water depth. The Malabar sewage treatment system
  includes flows from Liverpool STP, Glenfield STP and Fairfield storm STP.

  Beneficial reuse and recycling: On site reuse.

  Asset status: Efficiency improvements were made to the operation of cogeneration generators at
  Malabar STP in 2007–08. The installation of a recycled water plant is in progress at the STP to
  reduce drinking water use at this site.

  STP performance:
     Load and concentration levels of suspended solids and oil and grease were within the
      current licence limits.
       There was no evidence of ecotoxic effects from the STP discharges.

				
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