CAPE PENINSULA UNIVERSITY OF TECHNOLOGY by ScOPFtE2

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									SUPPLEMENTARY EFFLUENTS NOTES

    A hypothetical wastewater treatment works final effluent summary report is
    attached. 6 out of 31 parameters are included in the table, and the reason for
    choosing these six parameters is due to the fact that they are controllable by the
    operators at the facility. The ones not included are beyond the control of the
    operator, and may result due to upstream pollution and discharge contraventions.
    The figures in brackets are the discharge limits per parameter.

Plant        Date      Flow   TSS       COD      NH3       Nitrate    Ortho P     E.Coli
                       Ml/d   mg/l      mg/l     mgN/l     mgN/l      mgP/l       Per
                              (25)      (75)     (10)                 (1)         100ml
                                                                                  (1000 per
                                                                                  100ml)
Athlone      27/2/07   84.5   24        94       1.4       5.3        5.1         210 000
Bellville    28/2/07   56.9   11        48       12.0      1.7        1.0         50 000
Cape Flats   27/2/07   33.0   67        148      6.5       0.5        8.5         1 750
Klipheuwel   26/2/07   -      5         76       18.7      15.5       15.8        100
Mitchells    26/2/07   30.0   32        90       1.4       7.3        8.4         48 000
Plain
Parow        27/2/07   1.1    2         45       20        0.0        1.0         5
Llandudno    26/2/07   0.4    4         66       6.0       15.5       12.0        7 500
Potsdam      27/2/07   38.2   14        90       14.0      0.6        7.0         390 000


         The high E.coli at Athlone, which does not have an applied disinfection
          facility, could be as a result of high flow rates and too little retention times.
          The maturation ponds are supposed to utilise the ultra violet rays from the
          sun to reduce the amount of E.coli. This situation can be rectified by
          applying formalised disinfection.

         The high E.coli at Llandudno, which has a chlorination facility, could be
          due to excess demand, or the fact that the plant may be depleted of its
          chlorine stocks.

         The Mitchells Plain non-compliance in terms of the E.coli is similar to that
          of Athlone, except that the maturation ponds are working as it should, but
          that there could be sludge or raw wastewater overflow in the ponds.

         Ortho-Phosphate does not have a general standard, but a special standard
          for highly sensitive areas, eg Potsdam and Rietvlei.

         TSS, COD and NH3 are harmful to the environment, mainly aquatic life if
          the general standards are exceeded.

         E.coli non-compliances have negative effects if in direct human contact.

         Nitrates and Ortho-P excesses result in nutrient pollution and can result in
          the proliferation of weeds in aquatic systems.
 Very high ammonia discharges could be due to aeration capacity or
  process problems, eg mechanical breakdown at the plant, lack of capacity,
  etc.

								
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