New Jersey Drinking Water Treatment Plant Study
Fate of Organic Wastewater Contaminants in a Drinking-Water Treatment
Paul E. Stackelberg, U.S. Geological Survey,
Phil Roosa, Passaic Valley Water Commission, Alden Henderson and Nicole
Smith Centers for Disease Control and Prevention (staff support from
Lee Lippincott, NJDEP)
A public community drinking water treatment plant using
surface water as its water source and having
significant upstream wastewater discharge was selected for this component
of the study. It was of interest to the researchers to determine the efficiency
of removal for the chemicals that were detected in the raw source water.
The drinking water facility uses “conventional treatment”
which consists of pre-disinfection with chlorine, flocculation/sedimentation,
filtration, and post-disinfection with chlorine. Raw water, settled water,
filtered water and delivered (finished) drinking water was sampled at
this one facility to examine the water treatment process and measure removal
efficiencies for these trace organic contaminants.
Part of the preliminary assessment of water treatment
efficiency is presented in the Figure. The Figure shows the concentrations
of 11 contaminants as they move thorough the treatment process. Tetrachloroethylene
is a New Jersey regulated contaminant with a maximum contaminant level
(MCL) of 1 part-per-billion (ppb). The level detected in this research
project was well below the MCL at approximately 0.05 ppb.