ANSI AWWA B116-19 pdf free download – Electrodialysis and Ion-Exchange Membrane Systems
History. IEMs are made from a variety of materials, and new membrane materials, structures, and surface treatments are being developed. Measurements of membrane performance, including separation and output, are not universally standardized by regulatory agencies. However, some standards groups have published standardized measurement methods and the industry has developed approaches. This is one of the purposes of the testing requirements outlined in the US Environmental Protection Agency (USEPA) Membrane Filtration Guidance Manual (USEPA 2005) associated with the Long Term 2 Enhanced Surface Water Treatment Rule (USEPA 2006) as well as in NSF/ANSI 419, Public Drinking Water Equipment Performance— Filtration. However, while ED, EDR, EDM, and EDI are generically classified as membrane processes, these treatment technologies do not specifically constitute “membrane filtration” as defined by the LT2ESWTR (40 Code of Federal Regulations [CFR] 141.2). Unlike nanofiltration (NF) and reverse osmosis (RO), which use pressure to force water through membranes while rejecting dissolved solids, the driving force for separation in IEM processes is electric potential, and an applied electrical current is utilized to transport ionic species across selectively permeable IEMs. Because the water is not “filtered” through the membrane in ion-exchange processes, particulate matter is not removed. Thus, ion-exchange (ion-transfer) membranes are specifically applied for the removal of dissolved ionic constituents but are not considered filters. Consequently, ion-exchange (ion-transfer) membrane processes are not addressed in the USEPA Membrane Filtration Guidance Manual. Regulatory concerns may or may not be the primary drivers for the use of membranes by a municipality, but in all cases the regulations must be assessed for applicability. At present, US federal drinking water standards covering membrane treatment deal mainly with how much removal credit can be received from membrane treatment’s use as a microbial barrier. Other issues, such as acceptable water contact materials and meeting the primary and secondary contaminant levels in the finished water, may also apply.
This standard should be considered as a list of minimum requirements for planning, procurement, selection, construction, and commissioning of microfiltration- and ultrafiltration-based treatment systems. However, its proper application requires this standard to be coupled with a thorough professional review of site-specific water treatment conditions. The AWWA Standards Council authorized a new AWWA standard for membrane systems on Sept. 10, 2004, and assigned the task of development to the AWWA Standards Committee on Membranes. The first edition of this standard, ANSI/AWWA B116-15 Electrodialysis and Ion-Exchange Membrane Systems, was approved by the AWWA Board of Directors on Jan. 24, 2015. The standard was approved and promulgated in the course of the activities of the AWWA Standards Committee on Membranes. A previous standard, B110 Membrane Systems, had been divided into three separate standards, each focused on a specific category of membrane technology: (1) microfiltration and ultrafiltration, (2) nanofiltration and reverse osmosis, and (3) electrodialysis/ion-exchange/ion-transfer membrane systems (this standard). A standard on membrane bioreactors, B130, was also approved. Guidance to the applicable AWWA membrane standards is presented in Table 1.