Objective To investigate the influencing factors of the microbial contamination in the household sewage drainpipe.
Methods A total of 120 apartments were investigated in September 2008. The survey involved total bacterial count, fungus, saccharomycete, coliform, and staphylococcus aureus; and questionaire on the dwell period, the order of floor layer and the cleaning status. The sum rank test and χ2 test were used to analyze the data.
Results There were 57.5% and 48.3% of investigated apartments had happened blockage of draining and with offensive odor emitted from the drainpipe. On statistics of the rate of microbial detection, there was no difference among the apartments with different dwell period(P>0.05), except for the contamination at the outlet of the floor drain in toiletroom. There were significant differences among the microbial contamination level among certain household drainpipe(P<0.05). The average level of microbial contamination in household drainpipe for the apartment with 2-5 years dwell period was lower than that of the apartments with over 6 years dwell period. In addition, there was no difference for the microbial contamination level in the household drainpipes among different floor layer(P>0.05); furthermore, the daily cleaning process did not affact the microbial contamination level(P>0.05).
Conclusion Microbial contamination in the household drainpipe is generally existed in the apartments, relative lower contamination is happened in the apartment with shorter dwell period. The order of floor layer and daily water cleaning did not related to the microbial contamination.
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