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Ashland, OR, United States

Harfst W.F.,Harfst And Associates
Ultrapure Water | Year: 2011

The role of impurities in the selection and application of water treatment programs is discussed. With regard to dissolved gases, oxygen is the most objectionable from the standpoint of boiler feedwater supply, since this gas is the principle cause of internal pitting-type corrosion. The boiler operating pressure influences the selection and application of an internal treatment method. Boilers operated at low pressure tolerate more sludge than is the case at higher pressures because of the higher rates of heat transfer and ratings associated with higher pressures. Deposits that form on the heat transfer surfaces cause an increase in metal temperature, and eventually lead to failure. Excess sodium phosphate can concentrate is these films, giving rise to a condition known as phosphate hide out. Source


Harfst W.F.,Harfst And Associates
Ultrapure Water | Year: 2011

Achieving maximum utility and life expectancy from a water distribution system requires an understanding of the problems water can cause and the various materi als of construction that are available to minimize or eliminate these problems. Working together, corrosion and design engineers can create a water distribution system for any application that will last for 50 to 100 years. Source


Harfst W.F.,Harfst And Associates
Ultrapure Water | Year: 2011

In general, most softeners are operated at a high regeneration level for three practical reasons: 1. a softener requires fewer regenerations: 2. effluent has less hardness leakage; and 3. salt is cheap. This condition, however, results in poor regeneration efficiency and maximum salt discharge into the environment. The softener regeneration efficiency can be improved by modifications to the brine system. This includes the following strategies: 1. Reduce the salt dosage to achieve at least 3,350 gr/lb of salt and regenerate tite softener more frequently. 2. Reclaim a portion of the used saltbrine for recycle back to the softener during the next regeneration. This is only applicable to softeners that must be operated in the high salt dosage mode. 3. Capture and purify the used salt brine by chemical precipitation, settling, filtration and neutralization to achieve zero discharge. Alternatively, contract with a service provider for portable exchange softener units. In all cases, because of the inherent low-cost of salt, adopting these conservation strategies will not necessarily lower the overall cost for producing soft water. But you will be doing your part to reduce salt discharge into the environment and thereby enhance and maintain the quality of our freshwater reservoirs. Source


Hatfst W.F.,Harfst And Associates
Ultrapure Water | Year: 2011

The choice between purchasing a stan dard design versus custom-design RO system is one worth considering. Many standard-design RO systems are cur rently in service, producing a reliable, continuous supply of RO permeate for a variety of applications. Standard-design ROs are generally less costly to manu facture, and therefore offer some savings over custom design systems. That said, adopting the engineering approach of design/bid/build allows the enduser to specify the details of the RO system. This includes pretreat-ment requirements, scale and fouling control, physical configuration, and control instrumentation and software. This approach offers the advantage of guaranteeing that the final RO design will meet or exceed the specific needs of the enduser. Source


Harfst W.F.,Harfst And Associates
Ultrapure Water | Year: 2011

The use of soft water makeup for cooling lower operation offers several advantages over hard water makeup. Here is a list of some advantages: • Soft water eliminates mineral scale deposits for "bare metal" clean heat transfer surfaces. • The natural carbonate/bicarbonate buffer produccsa pH in the 9.2 to 9,6 range, which renders steel and other metals more passive and less prone to corrosion. • Soft water makeup reduces fresh water withdrawals, resulting in a significant savings in water and wastewater. • Operating the tower on soft water helps control the growth o f pathogenic organisms by maintaining the pH above the amplification range (pH > 9.2). • The purchase, storage, handling and feeding of chemical scale inhibitors and/or mineral acid is eliminated since soft water is non-scaling. Overall, the use of soft water for cooling tower makeup helps protect the natural environment, saves energy, reduces operating costs and extends the useful life of plant equipment. Source

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