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ASTEWATER

Plant Number

Date

5

Thennotolerant Colifonns

ÂŁ,coli

Salmo11el/a

C.pe1:fri11gens

Phage

/IOOmL 480000 1080000 24000000 119000 153000

/JOOmL 220000 150000 6000000 119000 99000

+/- in IOOmL

/IOOmL

14/05/96 31/07/96 21/08/96 9/10/96 29/01/97

+

700

+

1000 6500 380

/JOOmL 189 115 6370 1515 25

26/06/96 7/08/96 25/09/96 27/11/96 4/03/97

26000 I 65 200 7

5000

10000 490 180000 2070000

5000 90

8 8

9/05/96 24/07/96 3/09/96 26/11/96

II II II II II

14/05/96 23/07/96 28/08/96 26/11/96 5103/97

13 13 13 13 13

2/07/96 27/08/96 8/10/96 20/11/96 12/03/97

15 15 15 15 15

5 5

5 5 7 7 7 7

7 8

8

a

b

2

+ +

2

900 4200 2400 940 710

0

54 200 0

NT 2070000

+

300 970 880 15000

0 2

2 0 2

150 61000

150 27000

1300 550

600 5 60

0

0

9900

2700

2100 1000 570 210 630

8/05/96 16/07/96 21/08/96 1/10/96 4/02/97

95 4800 1200000 540000 148000

65 2400 350000 60000 92000

80 2000 2900 220 1140

19 19 19 19 19

14/05/96 23/07/96 27/08/96 8/10/96 29/01/97

43

43

2

0

640

530

6 0

3 0

20 20 20 20 20 20

16/04/96 2/07/96 3/09/96 1/10/96 27/11/96 I 1/02/97

260 16000 380 870 27000 150

50 8300 60 80 27000

24 24 24 24 24

13/05/96 30/07/96 3/09/96 1/10/96 5/02/97

65

26 26/06/96 26 6/08/96 26 9/09/96 26 15/10/96 26 12/02/97 Limit of detection varies with NT: not tested

9

0

I 21 4

1600 46 960 1000 8

+

+

+

200 1500 420 I 0

0 0 0 0

0

421 0

218 940 0

0 0 0 0

5 0 0 0

0 0 0

591 I 1067 0 2

0 0 0

94 140 5

0

110 2800 1000 1040 200 300

0 0 0

120 150 240

0

21 0

0

530000 40000 2700 0 10600 10600 3300 0 73000 45000 turbidity of sample

+

162

96

130 0

0

5 0 0

700 70 36 I

29

0

3

0

I 0

Cl),ptosporidium /L 10 20 <301 <20 <20

Giardia /L 40 110 390 120 460

<10 <20 <20 40 <10

1390 2580 4840 2260 1120

<20 <30 <20

2850 600

NT"

720

NT

<20 240 <10 <20 <20

480 220 10 380 320

<10 <10 <20 <20 <20

JO 70 560 100 360

<20 10 <JO <20 80

200 20 220 340

10 <20 <JO <10 <10

160 520 80 <10 10

<JO 20 <20 <JO 20 <10

140 320 520 270 1060 <JO

<JO 60 <10 <20 <20

30 80 140 280 60

60 <10 <20 <10 <10

180 80 100 <10 <10

260

Table 3. Multiple sample analysis of 10 sewage treatment plants

detectable limits were taken to be zero, while samples not tested were regarded as missing values. Simple linear correlation coefficients were calculated among assays after transformation to the logarithm 10 (concentration + 1) scale. For the binary valued Sal111011ella assay, mean thermotolerant coliforms m samples positive for Sal111011ella were compared with negatives by t-test after transforma-

tion to logarithm 1u(concentration + 1). Results Microbiological assay results for the single sample survey of 33 STPs are presented in Table 2. The results for the multiple analysis survey in which 10 of the STPs were sampled at regular intervals for 8 to 10 months are presented in Table 3. Results for ponded effiuents

from 3 STPs sampled once, and one STP sampled 6 times are presented in Table 4. A high variability was seen between and within the STPs with respect to the numbers of the assayed microorganisms m the secondary-treated effluents. Ranges for all 92 samples (with geometric means in brackets) were: thermotolerant coliforms, 0 to 24,000,000 (388)/!00mL; C. perfri//ge//s, 0 to 15,000 WATER MARCH/APRIL 2000

41

Profile for australianwater

Water Journal March - April 2000  

Water Journal March - April 2000