SDI


Related content

EDS adds SDI Workshop to Barcelona events

The European Desalination Society has added a workshop on the Silt Density Index to the satellite events around its upcoming Barcelona conference, the society confirmed in an announcement on 12 March 2012.

Figure 1: Fabric in hollow fine fibre permeator of Du Pont Permasep

Why MFI is edging SDI as a fouling index

PARTICULATE FOULING has plagued reverse osmosis (RO) systems since their first use in desalination and remains a persistent issue today for RO and other pressure-driven systems such as microfiltration (MF), ultrafiltration (UF) and nanofiltration (NF). In the early 1960s, the Du Pont company/Permasep Product successfully launched the hollow-fine-fibre (HFF) permeator onto the desalination market, where it dominated for several decades. A well-known weakness of this permeator was its vulnerability to fouling. Initially, this vulnerability was attributed to suspended and colloidal matter in the feed water, ie, particulate fouling. Therefore, Du Pont developed, the Silt Density Index (SDI), initially named the Fouling Index, as a parameter to characterize the fouling potential of the feedwater for permeators. The fouling mechanism turned out to be more complicated than just fouling of the membrane surface as initially assumed. Gradually it became clear that the fouling was initiated by local clogging of the woven or non-woven fabric between the fibres, which is needed to ensure equal flow distribution of the feed water (see Figure 1). This article first appeared in the issue of Desalination & Water Reuse magazine.

Two direct potable reuse projects are currently in operation worldwide, in Texas, US, and Windhoek, Namibia

The Long Read: Do we have the technology for potable water reuse?

Water reuse for drinking purposes is racing up the agenda in the US and elsewhere. Work to draw up new rules for potable reuse is advancing in states including California and Arizona, as well as in Canada and the European Union. Technologies are being piloted, and plants permitted.

The ultrafiltration system in Abu Dhabi supplied by inge watertechnologies AG will treat 80,000 m³/d.

UF modules ordered for UAE steelworks' RO pretreatment

Ultrafiltration modules from Germany's inge watertechnologies AG have been ordered for a 80,000 m³/d seawater reverse-osmosis desalination plant at the Emirates Steel Industries steelworks in Mussafah, UAE.

Siemens membranes to pretreat Perth II plant

Siemens is to provide a 95 MGD (360,000 m³/d) pressurized membrane treatment system for Water Corporation's Southern Seawater desalination plant in Binningup, south of Perth, Australia.


Suggested keywords