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Experimental analysis results showed that Salmonella, Shigella, rotavirus and enterovirus were not detected in lake water (Table 1). In contrast, the average concentrations of E. coli and norovirus were 2.89 CFU/mL and 1.45 CFU/mL, respectively. In Table 1, the numbers 1–5 represent the different sampling points, among which sampling point 1 is located in the lake center, sampling point 2 is beside the lake bank, sampling point 3 is in the plant covering area, sampling point 4 is near to the inflow point, and sampling point 5 is close to the discharging point. All of the five sampling points are marked in Figure 1. Based on the above analysis and results, E. coli and norovirus were finally determined as the major pathogenic factors in the Lake Cui water reuse system. The subsequent analysis and discussion were conducted mainly to focus on these two types of pathogens.
Table 1

Average concentration of E. coli and norovirus detected in reclaimed water (CFU/L)

 Sample label
 
Pathogen12345Average
E. coli 5.72 × 103 9.94 × 101 N/Aa 2.85 × 103 N/Aa 2.89 × 103 
Norovirus N/Aa N/Aa 1.45 × 103 N/Aa N/Aa 1.45 × 103 
 Sample label
 
Pathogen12345Average
E. coli 5.72 × 103 9.94 × 101 N/Aa 2.85 × 103 N/Aa 2.89 × 103 
Norovirus N/Aa N/Aa 1.45 × 103 N/Aa N/Aa 1.45 × 103 

aNot detected.

Figure 1

Sampling points in Lake Cui.

Figure 1

Sampling points in Lake Cui.

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