Full Description

The recent adoption of regulations in the state of Connecticut governing thedischarge of water treatment wastewater (WTW) challenges operations personneland design engineers to develop alternative methods of treatment and/or disposalof water treatment residuals. The South Central Connecticut Regional WaterAuthority (Authority) and the BHC Company, two of the largest water utilities inConnecticut, are currently facing residuals management issues relative tomaintaining regulatory compliance with the State's WTW General Permit. Thecurrent practice of residuals management at four different water treatment plantsowned by these utilities includes the use of unlined sludge drying beds forsolids consolidation and freeze-thaw dewatering prior to the removal of solids.The groundwater discharges from the sludge drying beds at each of thesefacilities consistently exceed the iron and manganese groundwater dischargethreshold limits, necessitating the need to re-evaluate existing residualsmanagement practices to ensure General Permit regulatory compliance. This papersummarizes the current residuals management practices at each facility and theGeneral 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; correlationsbetween anoxic conditions and residuals holding times that cause iron andmanganese to resolubilize in the sludge; and identification of various strategiesto bring the water treatment plants into WTW General Permit compliance. The goalof both water utilities is to develop and implement a cost-effective, long-termsolution for residuals management without compromising compliance with the WTWGeneral Permit. Includes tables, figures.

Product Details

Edition: Vol. - No. Published: 01/01/1999 Number of Pages: 18File Size: 1 file , 360 KB