Tag: Membrane

—

by

The Affordable Desalination Collaboration (ADC) has completed a major milestone in its test program that profiles the state-of-the-art performance for seawater reverse-osmosis (SWRO) technology. This testing ran over two years and involved operating seven sets of standard 8-in diameter membranes in seven-element pressure-vessels. The ADC demonstration plant was designed to produce between 48,100 to 75,600…

Advantages of Polyethersulfone (PESU) membranes for pretreatment for SWRO applications

—

by

Membrane pretreatment for large-scale seawater desalination has grown rapidly in the last few years. Existing examples seem to show that the additional cost can be more than recouped in reduced chemical costs alone, but there are also environmental advantages. This article is the first of two discussing the advantages of polyethersulfone (PESU) membranes for filtration…

Leveraging nanotechnology for next generation seawater desalination

—

by

in Desalination, Water reuse

NanoH2O advanced membranes for reverse osmosis (RO) desalination represent a new material that enhances current polymer-based membranes with the benefits of nanotechnology. These nanocomposite RO membranes represent a step-change in productivity through improved permeability while maintaining requisite salt and contaminant rejection. Since the original publication of this concept, further development and optimization of this membrane…

Bureau pilot tests show MBR reclamation potential

—

by

Membrane bioreactor (MBR) is a proven technology for wastewater reclamation that combines biological treatment with membrane filtration to achieve high quality effluent. Montgomery Watson Harza (MWH) and the city of San Diego have been conducting research on the MBR process since 1997 through various research projects. This article is derived from the report entitled Evaluation…

The coming of membrane distillation technology

—

by

Membrane distillation (MD) is a unit operation that uses hydrophobic membranes as a barrier for contaminated water from which mass transport of vapor is driven by differences in vapor pressure. MD does not require a mechanical pressure pump, and temperature levels are such that low-grade heat sources may be used to supply the required energy…

Antiscalant removes need for acid in wastewater RO

—

by

Field trials of a new scale-inhibiting chemical for use with reverse-osmosis membranes in wastewater reuse plants show that, at a low dose rate, it can increase the solubility of calcium phosphate by over one hundred times, obviating the need for using dangerous and costly acid. Current design practices for large effluent reuse projects are focused…

Combining Forward Osmosis with Reverse Osmosis

—

by

A combination of forward osmosis with reverse osmosis could facilitate the treatment of some high fouling wastewaters. The system uses brine to draw water from the wastewater without high pressure or turbulence. Key element is the membrane’s ability to allow rapid passage of water without much internal concentration polarization. The diluted draw solution can then…

MBR upgrades mean less maintenance and longer life

—

by

In recent years, MBR membranes have evolved to the point where they require less maintenance and at the same time have a longer useful life. An added benefit comes from the more advanced designs that consume significantly less energy and lower operating costs. The new Puron module from Koch Membrane Systems Inc (KMS) is a…

High-flow cartridges provide safety filter solution for RO

—

by

In recent years, considerable progress has been achieved in membrane technology in China. It has been widely used in many fields, including seawater desalination, power plants, metallurgic, petrochemical, and municipal and wastewater reuse. This article looks at the use of safety filters for RO systems and how a high-flow filter can avoid build-up of microorganisms…

UF solution to rural water supplies?

—

by