This powerpoint presentation begins by providing a brief overview of a water system and then provides aquifer storage and retrieval (ASR) operations, including:
ASR as a supplement to treatment plant
production during high-use periods and
in winter during high turbidity events;
injection typically from Nov-March
at two of four wells approximately 3.5 mgd;
storage goal of 500 mg,
recovery from 3 of 4 wells approximately 6.7 mgd,
100% recovery with use of groundwater rights. Initial investigations included the following:
monitor THM concentrations over a 30-day storage
period, with
weekly measurements of THM at each of four wells;
collect samples from each well and finished water
from TP; and,
time series analysis after 30-d storage (every 10-
min for 1 h). The analytical methodology included:
U.S. Environmental Protection Agency Method 524.2;
purgeable organic compounds by capillary column
GC/MS;
alternate methods 551.1 and 552.2 (liquid extraction with
ECD);
all provide full speciation;
Hach Procedure 10132;
colorimetric read on spectrophotometer;
all results reported as chloroform (CHCl3); and,
estimated detection limit of 6 ug L-1. Study findings include the following:
THM concentration appears to be related to storage
volume;
formation occurs rapidly during storage period;
rate of dissipation indicates that THMs are not
evenly distributed in stored water;
lack of observation in ASR 1 and 2 suggests a localized
phenomenom;
dissipation of THMs does not appear to be a
function of mixing/dilution (based on geochem
data);
TOC probably the limiting factor in formation; and, (triangle)
SUVA indicates potential source of additional
TOC/DOC. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.3 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 21 |
| Published : | 11/01/2008 |
