This paper discuss' wellfield sand issues and how they impacted a RO system operation. This paper also gives an overview of the progression of the wellfield solutions, starting with the addition of basket strainers, to well redevelopment, and eventually to the installation of automatic backwashing sand strainers. The overview includes a summary of ...

This paper discusses the study, design and permitting of the Marco Island surface water membrane filtration system and describes how the project met the City's needs while meeting several logistical and permitting challenges....

This presentation provides an overview of some of the challenges associate with RO Concentrate Management. It elaborates on the relationship between recovery and brine concentration and elaborates on how non-RO options have been selected only because of lack of adequate concentrate management strategies. A list of management options as well as an ...

This paper will discuss the challenges and lessons learned during the permitting, construction and commissioning of the Marco Island surface water membrane filtration system. This paper will also discuss the master planning of the upgrades to the existing conventional and brackish water RO facilities and how the new membrane filtration system provi...

Presentation offers a detailed account of microfiltration and ultrafiltration membrane system facility and process design. Pressurized and immersed designs are reviewed along with the unique design issues of each. Mechanical and ancillary systems are discussed including with facility design recommendations that will reduce maintenance and improve o...

The paper compared several energy recovery devices (ERD) for Bonita Springs Utilities membrane element, and membrane train expansion combinations. The analysis resulted in a membrane element specification that considered not only purchase cost, but also life-cycle cost when operating with the new ERD at current and potential future feed water qual...

Presents an overview of the system design considerations around membrane plants. The perspective presetned is a full system view of a membrane plant....

This presentation from a preconference workshop in 2014 for Back to Basics on membrane technology discusses low pressure system design concepts. Comparisons within the MF and UF technology are made with respect to design, performance and applications....

This case study of the upgrades to the Bonita Springs Brackish water membrane plant was given at a Preconference Workshop on optimizing membrane plant performance in 2014. Energy recovery options, plant redesign and membrane upgrade choices are all described as well as final results of the effort....

This paper summarizes the decision process utilities may use to look at replacing the lime softening system with nanofiltration (NF) or even low-pressure reverse osmosis (LPRO). The factors that go into this analysis are presented and a real-life example at Marco Island Florida of the analysis is given....

The City of Marco Island is in the process of converting from lime softening to low-pressure reverse osmosis to reduce significant annual operating cost, while significantly improving finished water quality, reliability and operability. The new RO system will treat MF filtered high-TOC surface water from the existing North Water Treatment Plant. ...

NSID commissioned a new RO system in 2016 to replace their LS WTP. During the commissioning process, the source water quality at the facility was found to be unsuitable for the membranes start-up, despite previous performance tests demonstrating that the water quality as sufficient for membranes. This paper will discuss the challenges and solutions...

The evaluation and lessons learned during the membrane replacement process are applicable to other utilities looking at membrane replacement and how to consider upgrades of their existing RO systems with a focus on reducing life cycle costs. This paper will summarize the results of the initial facility evaluation and the membrane replacement bid re...

This paper provides a summary of the membrane evaluation, condition assessment, evaluation results, design considerations for the system upgrade and a discussion of several items found during commissioning....

Lee County Utilities owns and operates the Green Meadows lime softening facility that treats a blend of surficial aquifer groundwater and intermediate Sandstone aquifer groundwater, both hard, freshwater sources, producing up to 9 mgd. The facility?s aging treatment infrastructure was nearing the end of its useful life and needed to be replaced to ...

This paper will describe Marco Island's membrane filtration fouling troubleshooting, alternative membrane manufacturer module replacement and facility expansion experience. Other utilities and consultants will benefit from the knowledge generated during the process of understanding/mitigating of MF fouling within the Marco system. Utilities will al...