Relationship between combined chlorine (inactive chlorine)‎ and thermotolerant (Faecal)‎ coliforms bacteria in drinking water among some neighborhoods of Al-Najaf City

الملخص EN

Drinking water must not have a special taste or odor, be pure, constant at chemical compound, and not contain pathogenic bacteria, parasites and toxic substances.

In this cross-sectional study was carried out for tested some of Iraqi drinking water parameters for detect if a present correlation between of combined chlorine (in active chlorine) and thermotolerant (faecal) coliforms the indicator bacteria in drinking water of some neighbourhoods in Al-Najaf city, according to recommendations by the World Health Organization (WHO) and Iraqi water parameters in assessment of drinking water quality.

The study was lasted from (1/8/2016 to 1/11/2016).

Samples was collected from fifteen neighborhoods of Al-Najaf city, some important chemical drinking water quality parameters, of ((total chlorine, free chlorine, and combined chlorine)), were examined at the field of the sample locations, through use of portable digitize devise and Bacteria of thermotolerant (faecal) coliforms was tested in the laboratory.

The study shows that an increasing of total chlorine mean of (1.95 ppm) more than of free chlorine mean of (1.44 ppm) in all fifteen samples locations of Al-Najaf city.

The present study shows a fifteen neighborhoods of Al-Najaf city under studied that was giving a combined chlorine value of more than (1 ppm) and mean of (1.5 ppm).

The study find out a highly growth of indicator bacteria (thermotolerant coliforms) with a mean of (36.6) in all studied sample locations of the fifteen neighborhoods of AL-Najaf city.

There was no any effect of disinfectant action by present free chlorine residual in all fifteen neighborhoods of al-Najaf city although of mean reach at (1.44 ppm).

The study discovered a relationship between a combined chlorine and thermotolerant (faecal) coliforms through direct strongly correlated at (r = 0.967) in all studied sample locations of the fifteen neighborhoods of AL-Najaf city.

The study recommends for an effective measures must be taken to improve diagnostic procedures when monitoring of drinking water in all neighborhoods of Al-Najaf city, and Increasing the efficiency of chlorine as disinfectant and its residual through readjustment of Iraqi chlorine parameters to accommodate with water nature of all governorate