Alexander Szabo and Oscar Engle - Svenskt Vatten

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Table 8.8: Measured BOD 5 and COD on the 5-6 Nov 2009. Relationship BOD 5 /COD is calculated from average values. The ratio BOD 5 /COD at 05:00 is not considered because of an invalid value. Time:   COD (mg/l) BOD 5 (mg/l) Ratio BOD 5 /COD 17:00   120   58 0.48 19:00   77   35 0.45 22:00   62   36 0.58 23:00   79   41 0.52 01:00   72   54 0.75 03:00   48   29 0.60 07:00   46   39 0.85 09:00   126   76 0.60 11:00   222   63 0.28 13:00   148   66 0.45 14:15   195   89 0.46               Average: 102   51         Ratio = 0.5   Total Suspended Solids in influent water   50 
Figure 8.14: Above: TSS concentrations from all three measurements periods from influent waste water to the WSP. Below: Rain data collected from UTMs weather station. It can be observed that the TSS on the 5-6 November and 18-19 November are directly affected by the precipitation. The TSS trend tends to be highly affected by rainfall (see Figure 8.13). The peak at 08:00 on the 9-10 Jan is not related to any rainfall and the cause is unknown. The same sample showed an unusual high COD-value as well the TSS result is considered as valid. Dimensioning values TSS For all 12 waste water samples collected on 5-6 November 2009, 18-19 November 2009 and 9-10 January the maximum and minimum TSS-value has been tabulated in Table 8.9 below. From the flow data collected an average weighted TSS value and total load per day has been calculated. Table 8.9: Measured TSS-values on 5-6 November 2009, 18-19 November 2009 and 9-10 January 2010. * Partly based on designed flow   Maximum Minimum Weighted Total load per 5-6 Nov 18-19 Nov 9-10 Jan Average value (mg/l) 150 210 193 (mg/l) 11 1 2 average (mg/l) 63* 52 47 54 day (kg) 401* 389 261 350 COD For all 12 waste water samples collected on 5-6 November 2009, 18-19 November 2009 and 9-10 January the maximum and minimum COD-value has been tabulated in Table 8.10 below. From   51 
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Page 3 and 4: ___________________________________
Page 5 and 6: List of abbreviations BOD - Biochem
Page 7 and 8: Summary Malaysia is developing fast
Page 9 and 10: Acknowledgements This report is a r
Page 11 and 12: Contents  List of abbreviations..
Page 13 and 14: Waste water production in t
Page 15 and 16: XI   
Page 17 and 18: treatment facilities simple, treatm
Page 19 and 20: 1.3 Objective The objective of this
Page 21 and 22: 2.2 Pretreatment   Screening The
Page 23 and 24: the case of waste water treatment p
Page 25 and 26: 3. Pond Hydraulics 3.1 Retention ti
Page 27 and 28: 5. Previous studies on WSP systems
Page 29 and 30: value of 4:1 in length/width ratio.
Page 31 and 32: 6. Study Area   6.1 Climate Johor
Page 33 and 34: Figure 6.3: The receiving river. Up
Page 35 and 36: accuracy (the accuracy of a single
Page 37 and 38: BOD analyzes were carried out using
Page 39 and 40:   35 
Page 41 and 42: 8. Water flow and quality Sampling
Page 43 and 44: stirred up. The algae population ma
Page 45 and 46: Table 8.2: Influent (weighted COD a
Page 47 and 48: Figure 8.8: Above: The water veloci
Page 49 and 50: Figure 8.10: The water velocity in
Page 51 and 52: Method 1: Estimation of domestic wa
Page 53: atio between BOD 5 and COD for the
Page 57 and 58: Table 8.11: Measured BOD 5 on 5-6 N
Page 59 and 60:   55 
Page 61:   Screening device  The task
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Alexander Szabo and Oscar Engle - Svenskt Vatten

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