The recent adoption of regulations in the state of Connecticut governing the
discharge of water treatment wastewater (WTW) challenges operations personnel
and design engineers to develop alternative methods of treatment and/or disposal
of water treatment residuals. The South Central Connecticut Regional Water
Authority (Authority) and the BHC Company, two of the largest water utilities in
Connecticut, are currently facing residuals management issues relative to
maintaining regulatory compliance with the State's WTW General Permit. The
current practice of residuals management at four different water treatment plants
owned by these utilities includes the use of unlined sludge drying beds for
solids consolidation and freeze-thaw dewatering prior to the removal of solids.
The groundwater discharges from the sludge drying beds at each of these
facilities consistently exceed the iron and manganese groundwater discharge
threshold limits, necessitating the need to re-evaluate existing residuals
management practices to ensure General Permit regulatory compliance. This paper
summarizes the current residuals management practices at each facility and the
General Permit compliance issues associated with the respective drying beds.
Residual management considerations that will be addressed in the paper include:
residuals sampling procedures required by the General Permit; correlations
between anoxic conditions and residuals holding times that cause iron and
manganese to resolubilize in the sludge; and identification of various strategies
to bring the water treatment plants into WTW General Permit compliance. The goal
of both water utilities is to develop and implement a cost-effective, long-term
solution for residuals management without compromising compliance with the WTW
General Permit. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 360 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 18 |
| Published : | 01/01/1999 |
