An evaluation of hygienic barriers at Oset water treatment plant at different operational modes
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- Master's theses (RealTek) 
An Evaluation of Hygienic Barriers at Oset Water Treatment Plant at Different Operational Modes The aim of this thesis is to determine the raw water quality level of Oset drinking water treatment plant, the hygienic barrier level required in the treatment plant based on the raw water quality level and number of consumers, and the final hygienic barrier levels in the different operational situations. The risk and vulnerability analysis done for the treatment plant states that the backup drinking water treatment operation does not meet the requirements and the water must be cocked before use. But there is no analysis done in situations of combining chemically treated and UV disinfected water is mixed with UV disinfected raw water and chlorine disinfection after the two types of water are mixed. Types of data used in this thesis are secondary data collected and analyzed by ALS laboratory group Norway AS. Data of microbial and chemical raw water quality were extracted from the plant's data base for five years to determine the raw water quality. The hygienic barrier level required in the treatment plant was determined depending on the raw water quality level and the number of people using the drink inking water produced in the plant. The Norwegian water report 170_2009 was used as a standard tool to determine the hygienic level of the different operations in the plant. This thesis shows that the chemically treated and UV disinfected water has enough hygienic barrier. But if UV disinfection is replaced by chlorine disinfection, level of barriers against parasites and viruses is not enough. The backup operation has not enough hygienic barriers. Both planned and high demand driven combination of operations have enough hygienic barrier level. The results show that combining chemically treated water and UV disinfected raw water with final chlorine disinfection has enough hygienic barriers. The chemical treatment followed by chlorine disinfection has no enough hygienic barrier against parasites and the chlorine concentration is not enough for virus inactivation.
Evaluerer Oset drikkevanns behandligsannleggs hygieniske barrierer i ulike driftssituasjon ved å bruke Norsk vann rapport 170_2009 som en standard verktøy.