The publisher regrets that due to an error in production, Table 4 in the above paper was printed incorrectly. We wish to apologise to the authors and to the readers for any inconvenience caused by this error.

The correct version of Table 4 is printed below.

Table 4

Frequency of sampling and performed analysis for the three experiments. The pH and temperature was analysed daily

ParameterExperiment 1Experiment 2Experiment 3
DO Twice a week Twice a week Daily 
Turbidity Daily Daily Once a week 
BOD5 Every 3 weeks Every 4 weeks Once a week 
COD total Every 3 weeks Every 2 weeks Once a week 
COD soluble Every 3 weeks Every 2 weeks Once a week 
Faecal coliforms Every 3 weeks Every 2 weeks Once a week 
ParameterExperiment 1Experiment 2Experiment 3

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