The objectives of this study were to optimize and increase the overall feed water recovery of the desalination process and thereby reduce concentrate volume....

A detailed pilot study has been conducted to evaluate the upper San Francisco Bay/lower Sacramento River Delta as a potential location for a new 71 mgd desalination treatment facility. Various membrane elements and pilot configurations were tested during a six month study, through periods of highly varying salinity and water quality. Results of the...

Use of Reverse Osmosis and Nanofiltration for Meeting Regulations and Addressing Potential Contaminants of Concern....

This paper will present results from the final phase of an on-going study exploring organic carbon removal from membrane concentrate by chemical treatment (coprecipitation with iron salts or lime softening) followed by solid-liquid separation....

Pilot testing pre-treatment alternatives on a difficult to treat (i.e., high organics and taste & older) surface water was conducted. Testing trains included: 1. MIEX with coagulation and sedimentation; 2. Enhanced coagulation; 3. Enhanced softening and; 4. MIEX alone. Pilot testing included MF/UF treatment after the pretreatment. MIEX with coagula...

In order to reduce potable water demands a 1.1 mgd wastewater reclamation facility was proposed in Queensland AU. RO concentrate disposal was an issue due to concentrated chloramines in the brine. Two options were investigated. The option chosen included a storage tank and dechlorination with sodium bi-sulfite before river discharge. This facility ...

This paper will describe this delivery approach for a membrane bioreactor system and tools for managing associated risks. In addition, construction activities and lessons learned (to date) will so be provided. Clackamas County Water Environment Services (WES) initiated design for Phase I of the Tri-City Water Pollution Control Plant (WPCP) Expan...

In an attempt to restore estuarine ecosystems the Miami-Dade Water and Sewer Department is evaluating the potential to use reclaimed water. Three treatment trains are being investigated nitrification-denitrification-MF/UF-UV/AOP-Ozone/AOP and two alternate trains including RO and RO and MF/UF. The selected design includes full advanced treatment in...

This paper focuses on the assessment of RO and NF performance, and specifically addresses the full-scale desalination design to accommodate water quality fluctuations as well as evaluating the performance of the desalination membranes during feedwater conditions that varied from their ideal design conditions The pilot plant was located at CCWD's Ma...

The Gibson Island Advanced Water treatment plant is a 25 MGD facility that treats wastewater effluent to potable water standards. The treatment system includes Actiflo pretreatment, MF-RO-and UV/AOP with hydrogen peroxide. The treated water is used as industrial re-use and indirect potable re-use via storage reservoirs. The plant has operated for o...

Design, construction and startup of Membrane Bioreactor (MBR) at the Tri-City Water Pollution control Plant (WPCP) Oregon facility....

This presentation provides a comparison between Microfiltration and Ultrafiltration membrane systems and provides an overview of manufacturers, relevant definitions and guidelines for major design issues. Considerations about pilot testing and advantages to Owner/Engineer in selecting membrane system prior to plant design is included in the prese...

This presentation provides a detailed time line and step by step pictorial presentation of a membrane plant upgrade process for City of West Carrollton....

The paper described work to investigate the removal of selected PPCPS by magnetic ion exchange, ultrafiltration and reverse osmosis in synthetic and natural water....

This paper presents the results of Miami?Dade's ambitious pilot program and evaluate treatment technologies, providing utility managers with:? The development of this pilot program, including water quality and scientific goals, and the stakeholders input process;? The performance and effectiveness of the individual advanced treatment technologies (...

This presentation discusses the implementation of a new surface water treatment plant, with wide annual temperature range. The paper describes piloting, and discusses pilot plasnt results. Also discussed is the performance of the plant during demonstartion testing....

This PowerPoint discusses costs for membrane systems built and operated in the Midwest USA....

This presentation provides information on data collection and management for microfiltration (MF) and ultrafiltration (UF) membrane processes. The discussion includes data collection recommendations for membrane warranties, plant startup, process monitoring, and membrane cleaning. Data trending examples are provided along with troubleshooting tips....

Discusses alternatives for advanced treatment in mining operations, background on RO, and options for brine recovery. Gives order of magnitude costs for brine recovery alteranatives, including FO, evaporators, EDR, and secondary RO....

Reverse osmosis (RO) is a proven technology for the removal of high concentrations of total dissolved solids. One of the major challenges of any RO system is the disposal of the brine, or concentrate, which is produced during normal operations. The treatment of brine is typically undertaken to minimize the cost of disposal or to maximize the reco...

Energy is often the most significant factor in the affordability and sustainability of treating various different source waters by desalination. More than 33% of the cost to produce water using reverse osmosis technology is attributed to electrical demands. As a result, there is considerable interest in optimizing energy and employing renewable ene...

SECONDARY MEMBRANES FOR BACKWASH RECOVERY: ESTABLISHING DESIGN CRITERIA, DEMONSTRATING PERFORMANCE EXPECTATIONS, AND IMPLEMENTATION. The proposed SFWTP will incorporate a submerged ultrafiltration membrane system and will be operated using a siphon (without feed or filtrate pumps), enabling the new facility to utilize available topography for red...

Presentation provides an account of the many beneficial ways in which treated wastewater is now being used. The report describes how reuse water quality regulations are established by regulatory agencies based upon the application for use. To address, membrane processes can provide for effective treatment while minimizing the risk for public health...

Summary of renewable energy sources (wind, solar, biogas, geothermal) and energy reduction strategies for the minimization of greenhouse gasses (GHG). Technologies include distillation, microbial desalination cells, ion concentration polarization, and forward osmosis....

Reducing energy consumption is critical for lowering the cost of desalination and addressing environmental concerns about greenhouse gas (GHG) emissions from the continued use of conventional fossil fuels as the primary energy source for seawater desalination plants.In this study, a comprehensive literature review was conducted to gather informatio...

This presentation from a preconference workshop in 2014 for Back to Basics on membrane technology discusses water reuse and membrane bioreactors. A description of the various aspects of water reuse and how to address them is given. Advantages and disadvantages of different methods are reviewed....

This presentation discusses the practical application of electrodialysis metathesis (EDM), as experienced while operating two pilots in Colorado, including information on how the EDM system differs from traditional electrodialysis (ED) and the various options for coupling the EDM system with reverse osmosis (RO) / nanofiltration (NF). Data on wate...

This paper and presentation address the permitting issues and cost evaluation for an inland brackish water treatment plant. The solution to these challenges created a successful model for the region to follow....

Presents a case study on the operational aspects of the City of Cape Coral's RO experince. Includes discussion on aquifer quality degredation the City experinced and what design modifications can be made to address feed quality degredation....

This paper provides insights into methodologies for improved process monitoring and control and increased system reliability using predicative analytics. One such ?smart water utility?, North South Interconnection Project, making use of analytics is highlighted in its applications to potable reuse. Combining stable and reliable online instrumentati...

This paper discusses the pathogen removal by several different MBR systems with varying membrane materials, pore sizes and membrane geometries. Impact of membrane breach on passage of pathogens in MBR is also discussed in detail along with the operational performance of the MBR-RO train observed in few different studies across the country. The pa...

In potable reuse, reverse osmosis (RO) is important for system-level salinity management and as a pathogen barrier in the treatment train. Scaling is a key driver of cost for RO systems because it increases energy use and leads to more frequent cleaning and replacement of membrane elements. Phosphate-induced scaling in particular has been identifie...