Hamid Mohammad Al-Gabra,

Tianling Zhengb,Xin Yua,Science of the Total Environment,

2013. 463–464:525– 529

The disinfection process for inactivating

microorganisms at drinking water treatment plants is aimed for safety

ofdrinking water for humans from a microorganism, such as bacteria, viruses,

algae, fungi by using chlorination,ozonation, UV irradiation, etc. In the

present study, a combination of two disinfectants, UV irradiation followedby

chlorination, was evaluated for inactivating Aspergillus flavus under low contact

time and low dosage of UVirradiation. The results indicated an inverse

correlation between the inactivation of A. flavus by using UV irradiation only

or chlorination alone. By using UV radiation, the 2 log 10 control of A. flavus

was achieved after 30 s ofirradiation, while chlorination was observed to be

more effective than UV, where the 2 log was achieved at chlorine concentration

of 0.5, 1, 2 and 3 mg/l, in contact time of 60, 5, 1 and 1 min, respectively.

However, combineduse (UV irradiation followed by chlorination) was more

effective than using either UV or chlorination alone; 5 sUV irradiation

followed by chlorination produced 4 log 10 reduction of A. flavus at chlorine

concentrations of 2 and3 mg/l under a contact time of 15 min. The results

indicated that efficiency of UV irradiation improves whenfollowed by

chlorination at low concentrations.

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