Raw water quality after a forest fire in the watershed is highly impacted and the impacts directly affect the ability of any water treatment plant to produce potable water. Presentation of multiple examples of water quality impacts after fire is followed by a detailed discussion of treatment responses, which apply to all plants regardless of the p...

Membrane facilities are becoming a common and economical form of water treatment. Special design and operational considerations must be made when using in cold climates, as their efficiencies can be affected by changes in water density. Reviewing published literature combined with operational experience from both pilot and full scale membrane syste...

The main focus of this paper is to address several potential design pitfalls as well as other issues during construction and startup that could affect the performance and operatability of a membrane plant. Detail description of how to select an appropriate membrane permeability during the design and how to properly manage membrane fouling will als...

This presentation will summarize findings of a literature search and utility survey on the effects of large wildfires on water quality, especially in regards to membrane microfiltration and pre-treatment systems. The intent is to illuminate potential mitigation measures that can be taken to improve membrane feed water quality after a large-scale fi...

The field of commercially available membrane products is vast and expanding. In the early 2000's the majority of the market share was held by 3 to 4 suppliers each offering a single product. Driven by demand to meet more challenging applications, these suppliers expanded their offerings to new membrane polymers and hydraulic configurations. Today,...

The presentation will use visual aids such as process flow diagrams and three dimensional drawings to describe how the treatment process was designed for ease of operation and the key systems needed for mitigation of risks due to potential wildfires within the watersheds. Pretreatment and temporary systems will be described as they relate to antici...

The City of Bozeman put a 22 MGD microfiltration plant online in March of 2014. Over the course of the last three years of operation, several lessons have been learned. It was a large change from the previous direct filtration multimedia plant that had minimal automation. The presentation will highlight several of the important lessons the City of ...

Ultrafiltration/Microfiltration (UF/MF) plants can operate on feedwater from well water to surface water and even on wastewater sources. The advancement of today?s UF/MF technology has allowed water treatment plants to operate successfully on different water sources, each with a unique set of benefits and challenges. In this talk, numerous case s...

This presentation discusses different cleaning chemicals and techniques. It explains the chemistry of membrane cleaning, and how chemicals interact with different foulants under different conditions....

I would like to spend a few minutes on the history of the Butte Water System. Then I'd talk about the treatment technology selection, piloting process, and finally the selection and installation of the ceramic membranes....

One of the primary operational concerns with any membrane plant is fouling. This becomes even more of a concern at higher recovery and flux rates. A case study at a high recovery municipal installation demonstrates the ill effects of fouling from silica, calcium fluoride, and other foulants, as well as methods to identify and monitor, manage, and r...

Pilot testing was conducted at Sun Prairie Village County Water & Sewer District for a new water treatment plant to treat water from a local aquifer with very high hardness, sulfate, manganese and TDS. Extended testing of pressure filtration with different medias was required to provide adequate manganese removal prior to reverse osmosis. The pilot...

The City of Cottage Grove, Oregon has a 4 mgd Pall membrane plant. Special filtration situations are created by the presence of mine wastes, fluctuating raw water flows, siltation caused by forest fire and logging erosion, and the presence of cyanotoxins coming from blue/green algae blooms....

Raw waters with high TOC content present unique challenges to municipal treatment plant operators. These problems are exacerbated when the raw water is very cold. Plants in the Pacific Northwest are being subjected to raw water with increasing TOC content and regulations requiring lower disinfection byproducts. This presentation will discuss iss...

The Oden Water Association had an existing media filtration plant treating Oden Bay Water, a bay area off Lake Pend Oreille near Sand Point, Idaho. In 1999 they decided to replace the media filtration with ultrafiltration, which worked well for about 10 years. Then, after a membrane replacement in 2008, they experienced unexpectedly high levels o...

This presentation will discuss the operation of a 6 MGD pressurized two-stage Ultrafiltration (UF) plant over a 3 year period at the Oliver-Mercer-North Dunn (OMND) Drinking Water Treatment Facility. The OMND Treatment Facility utilizes Ultrafiltration followed by low pressure Reverse Osmosis Softening to produce a blended Finished Water capacity o...