Arja Hirvonen

TL;DR: The formation of biofilm was slower in copper pipes than in the PE pipes, but after 200 days there was no difference in microbial numbers between the pipe materials, and thereafter there were no differences between the two pipe materials.

TL;DR: The formation of biofilms increased with the flow velocity of water and the increase in microbial numbers and contents of ATP was clearer in the PE pipes than in the copper pipes, indicating that the mass transfer of nutrients is in major role in the growth of bioFilms.

TL;DR: It is found that copper pipes may require a higher chlorine dosage than plastic pipes to achieve effective disinfection of the pipes.

TL;DR: The performance of the O3, O3/UV and UV/H2O2 processes for degradation of six chlorophenols (4-chlorophenol, 2- chlorophenol 2, 4-dichlorophenol and pentachlorophenols) were studied in laboratory reactors.

TL;DR: Results indicated that chlorophenols can be treated efficiently by the methods studied, but the dechlorination of the compounds was insufficient, and the presence of a complicated mixture of intermediates suggests the need for toxicity testing to confirm the detoxifying effect of the chemical oxidation of chlorophenol.