The distribution system exerts an influence on treated water quality. This paper
focuses on the behavior of C, N, P, Si and S. These parameters are major nutrients
for microbiological growth. Some of them are monitored as a check on the amounts
of chemical addition in water treatment. The paper also compares the
results before and after ozone is used for primary disinfection. The Massachusetts Water Resources Authority (MWRA) has
investigated previously the effect of ozone in the absence of biofiltration. Weekly
monitoring of TOC and TIC show that BDOC increased due to ozone. But there was
no negative impact on water quality in terms of microbiological growth. This could
be due to the increase in chloramine target. Weekly monitoring of ammonia, nitrite
and nitrate show that there is increased conversion of ammonia to nitrate. But there
were no negative impacts from nitrification. TOC is negatively correlated with
combined nitrite and nitrate levels. The increase in nitrite and nitrate is also
negatively correlated with the level of ozone byproducts (aldehydes), as well as
chlorine byproducts (haloacetic acids). There were changes in the silica and sulfur
levels between finished water and distribution samples. This can be explained by
changes in pH and surface adsorption due to pipe materials (cement lining). And it
was observed that prior treatment with zinc orthophosphate at a community has
lingering impacts on zinc and phosphorus levels even though the treatment ceased for
about 10 years. Includes 4 references, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.1 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 17 |
| Published : | 11/01/2008 |
