AWWA ACE62956

The Southeast Morris County Municipal Utilities Authority's (Authority) Clyde Potts Reservoir has beenserving the residents of Morristown, New Jersey for over 70 years. Over that time, the treatment facilitieshave evolved in response to new water quality regulations. The original treatment, constructed in 1935was limited to chloramination and pH adjustment with lime. In 1998, the Authority constructed a 0.5MGD demonstration membrane treatment plant to evaluate this technology to comply with therequirements of the Surface Water Treatment Rule. The demonstration facility enabled the Authority toassess the effectiveness of this relatively new technology and gain valuable experience and operatingdata. The membranes provided for the demonstration facility were a pressurized type.Based on the operation of the demonstration plant, in 2000 the Authority commenced with the design of afull-scale 2.5 MGD membrane plant. The new plant, which uses immersed membranes, was placed intosuccessful operation in November 2004. The residuals handling systems result in less than 1% of the feedwater being discharged to waste.Each specific membrane system generates unique waste streams. The selection of the membrane systemfor this project was based in part on the additional systems that would be required to treat and dispose ofthe residuals generated by the specific membrane system. The project site is approximately 2 miles from the nearest sewer. A cost analysis was performed forconstruction of an express forcemain and the cost was prohibitive. Therefore all residuals needed to beeither recycled, disposed of to a nearby stream, or hauled off site.Studies were performed to assess the water quality of the membrane (waste washwater) reject and itspotential impact if it were recycled to the reservoir. State regulators agreed to allow the recycle of themembrane waste washwater with monitoring provisions. A chlorinated maintenance clean of themembranes is performed on a weekly basis. This waste stream is neutralized and discharged to an on-sitestream under the provisions of a NJPDES permit.Recovery cleans are performed approximately once per quarter and this waste, although neutralized,contains high concentrations of TDS and DBPs. This waste is stored on-site and hauled off-site fordisposal to a wastewater treatment plant.The plant has been in full-scale operation since November 2004. Plant staff routinely monitors thequantity and quality associated with the reject and cleaning wastes, as well as the reservoir supply. Thispaper focuses on the evaluation, selection, and implementation of the residuals handling system. Includes tables, figures.

Product Details

Edition:

Vol. - No.

Published:

06/01/2006

Number of Pages:

19

File Size:

1 file , 450 KB