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Filtronics System Solves Water Quality Issues at Bridge City Texas

Cutline 1: Mike Lund of the City of Bridge City water department monitors a control panel for the Filtronics, Inc., water filter system at the city’s Rachal Street well.

Cutline 2: A 3,000-gallon tank of filter media was installed at each of Bridge City’s three water wells as part of a $1.4 million system installed by Filtronics, Inc.

Cutline 3: Bridge City has implemented a new $1.4 million water filtration system designed to eliminate iron and manganese deposits that have resulted in cloudy tap water for many of the city’s residents.

By Dave Rogers

For The Record

Jerry Jones played it cool Tuesday when asked if he felt a sense of relief to finally have Bridge City’s $1.4 million water filtration system up and running.

“This is just another project,” the longtime city manager said.

Technically, turning on the sand filters at the city’s two operating wells last weekend only kicked off a 120-day pilot project, after which the city will need another OK from the Texas Commission on Environmental Quality to be 100 percent in the clear.

But Jones leaves little doubt he believes the iron and manganese buildups that have caused the cloudy and brown water for some Bridge City water customers for several years will soon be a thing of the past.

“This will be the end,” he said.

The system, bought from the California-based Filtronics, Inc., is going through break-in cycles, which mean the filters at the two wells are being backwashed more than normal for the next few days.

A 3,000-gallon tank of filter media was installed at each of Bridge City’s three water wells as part of a $1.4 million system installed by Filtronics, Inc.

“We’re testing them daily, and the state will come in and test it every week,” said Mike Lund, water department foreman for Bridge City.

“The state does not require that [daily testing] but with them being in the break-in period, we want to keep an eye on all that,” Jones said.

Lund said the tests for the new wells show that iron and manganese levels “are non-detectable coming out.”

“That tells us the filters are doing what they were designed to do,” Jones said. “They’re removing all the iron and manganese.”

The city has been serving its 3,800 water customers with just two of its three wells since last July, when the state

determined the city violated the maximum contaminant level for total trihalomethanes, a byproduct of the chlorine used to disinfect water.

Jones said it was discovered that the problem was caused by leaky casing in a single well that was immediately taken off line.

Repair work is complete on the repair of the “Romero” well, Jones said.

“When we got permission to start up those wells, the third well was not included because we were re-lining the well,” he said.

Bridge City has implemented a new $1.4 million water filtration system designed to eliminate iron and manganese deposits that have resulted in cloudy tap water for many of the city’s residents.

“But that’s all been done. It’s where we can put it back on-line, but we have to call TCEQ back out here and get them to OK that site.”

Jones cautioned that the city must flush its lines of all iron and manganese buildups before sounding the “all clear” on its water.

“It’s certainly good to get them on-line and get the iron and manganese removed. But we’re only at the starting point,” the city manager said.

“Now comes the task of removing all the iron and manganese from the lines that have accumulated over the last 25 to 30 years.”

The job of flushing the lines will cause cloudy water, but the city is enlisting the help of the fire department and plans to work at night to lessen the impact.

“When we do the flush process, we’ll do it a section of town at a time, and we’ll do it at night within the next couple of weeks,” he said.

“We’ll do it until we get it [iron and manganese] all out.”

The city manager is optimistic – and realistic.

“Hopefully, it’ll all go pretty quickly,” he said. “But if we say that, it’ll take four months.”

Original article:



Filtronics, Inc. Approved by TCEQ for Treatment Technology for Arsenic, Iron and

Filtronics, Inc. of Anaheim, California is pleased to announce they are one of the
first companies to receive approval from the Texas Commission on
Environmental Quality (TCEQ) for their treatment technology for the removal of
arsenic, iron and manganese at the filtration rate of 10 gallons per minute per
square foot.
This high filtration rate is significant for several reasons. Conventional systems
must operate at a much lower rate to achieve comparable results, often 3 to 5
gallons per minute. The benefit is substantial savings in the initial capital investment
for smaller, compact equipment and a very small footprint. Significant
cost savings are realized by the construction and use of smaller facilities and the
increased water production from the high filtration rate with less waste and
handling. The smaller filter size also translates into lower wash water
requirements and further enhances the backwash-to-filtration ratio for a more
efficient system.
The leading environmental agency for the state of Texas issued their approval
early last year. Filtronics has two filtration systems operating very successfully,
continually exceeding the effluent requirements imposed by the Environmental
Protection Agency (EPA) and the TCEQ.
About Filtronics, Inc.
Filtronics, Inc. is a leading manufacturer of municipal and industrial water
treatment systems. Founded in 1974, the internationally acclaimed company with
headquarters in Anaheim, California has been in the forefront of water
purification technology for nearly 40 years. An authorized dealer of NXT-2Ò
media, along with their full product line of ElectromediaÒ products, the company
is well known as successful arsenic, iron and manganese removal specialists
producing the highest quality environmentally friendly systems using the best
available technology.
Contact: Filtronics, Inc.

Filtronics System Doubles Water Output

 We love our customer feedback and the Eastsound Water Users Association where we have a Filtronics Model FV-05, Electromedia® I Skid Mounted Automatic filtering station designed for iron and manganese removal has seen remarkable improvement.
“Thought you might like to see how EWUA has been benefiting from our recent filtronics installation.

Our operators are gaining confidence and continuing to expand useage.

We remain very pleased with water quality.   Prior to filtronics installation we could not use Well 12 and Well 5 due to water quality and treatment limitations.
 EWUA = happy campers.”

Water production for iron and manganese removal system.

Coagulants in Water and Wastewater Treatment

The commonly used metal coagulants fall into two general categories: those based on aluminum and those based on iron. The aluminum coagulants include aluminum sulfate, aluminum chloride and sodium aluminate. The iron coagulants include ferric sulfate, ferrous sulfate, ferric chloride and ferric chloride sulfate. Other chemicals used as coagulants include hydrated lime and magnesium carbonate.

The effectiveness of aluminum and iron coagulants arises principally from their ability to form multi-charged polynuclear complexes with enhanced adsorption characteristics. The nature of the complexes formed may be controlled by the pH of the system.

When metal coagulants are added to water the metal ions (Al and Fe) hydrolyze rapidly but in a somewhat uncontrolled manner, forming a series of metal hydrolysis species. The efficiency of rapid mixing, the pH, and the coagulant dosage determine which hydrolysis species is effective for treatment.

There has been considerable development of pre-hydrolyzed inorganic coagulants, based on both aluminum and iron to produce the correct hydrolysis species regardless of the process conditions during treatment. These include aluminum chlorohydrate, polyaluminum chloride, polyaluminum sulfate chloride, polyaluminum silicate chloride and forms of polyaluminum chloride with organic polymers. Iron forms include polyferric sulfate and ferric salts with polymers. There are also polymerized aluminum-iron blends.

The principal advantages of pre-polymerized inorganic coagulants are that they are able to function efficiently over wide ranges of pH and raw water temperatures. They are less sensitive to low water temperatures; lower dosages are required to achieve water treatment goals; less chemical residuals are produced; and lower chloride or sulfate residuals are produced, resulting in lower final water TDS. They also produce lower metal residuals.

Pre-polymerized inorganic coagulants are prepared with varying basicity ratios, base concentrations, base addition rates, initial metal concentrations, ageing time, and ageing temperature. Because of the highly specific nature of these products, the best formulation for a particular water is case specific, and needs to be determined by jar testing. For example, in some applications alum may outperform some of the polyaluminum chloride formulations.

PoIymers are a large range of natural or synthetic, water soluble, macromolecular compounds that have the ability to destabilize or enhance flocculation of the constituents of a body of water.

Natural polymers have long been used as flocculants. For example, Sanskrit literature from around 2000 BC mentions the use of crushed nuts from the Nirmali tree (Strychnos potatorum) for clarifying water – a practice still alive today in parts of Tamil Nadu, where the plant is known as Therran and cultivated also for its medicinal properties. In general, the advantages of natural polymers are that they are virtually free of toxins, biodegradable in the environment and the raw products are often locally available. However, the use of synthetic polymers is more widespread. They are, in general, more effective as flocculants because of the level of control made possible during manufacture. Important mechanisms relating to polymers during treatment include electrostatic and bridging effects.

The figure below shows schematic stages in the bridging mechanism. Polymers are available in various forms including solutions, powders or beads, oil or water-based emulsions, and the Mannich types. The polymer charge density influences the configuration in solution: for a given molecular weight, increasing charge density stretches the polymer chains through increasing electrostatic repulsion between charged units, thereby increasing the viscosity of the polymer solution.


Figure 1. Stages in the bridging mechanism: (i) Dispersion; (ii) Adsorption; (iii) Compression or settling down (see inset); (iv) Collision (Reference 2)

One concern with synthetic polymers relates to potential toxicity issues, generally arising from residual unreacted monomers. However, the proportion of unreacted monomers can be controlled during manufacture, and the quantities present in treated waters are generally low.

The above is an excerpt for the following article:  Coagulation and Flocculation in Water and Wastewater Treatment – Article…

Arsenic Basic Process Assessment Guide

The concentraion of Iron in source water can be one of the main drivers in technology selection, therefore the presnece of iron will play a prominent role in technology selection and the treatability of a given water source.  The most effective arsenic removal processes available are iron-based treatment technologies such as chemical coagulation/filtration with iron salts and adsorptive media with iron-based products.  These methods are particularly effective in removing arsenic because iron has a strong affinity to adsorb arsenic.  Because of the unique role iron plays in facilitating arsenic removal, the level of iron in the source water is a primary consideration in the selection of an optimal treatment approach.

Arsenic to Iron ratio chart

The above chart shows a detailed description of the range of iron concentrations relative to arsenic concentrations and how the Fe:As ration could influence the treatment technology chosen.

  • HIGH iron levels (>0.3 mg/L).  HIGH Fe:As ratio (>20:1)
    Iron removal processes can be used to promote arsenic removal from drinking water via adsorption and co-precipitation.  Source waters with this ratio are potential candidates for arsenic removal by iron removal.  (A)
  • MODERATE iron levels (>0.3 mg/L). LOW Fe:As ratio (<20:1)
    If the iron to arsenic ratio in the source water is less than 20:1, then a modified treatment process such as coagulation/filtration with the addition of iron salts should be considered. (B)
  • LOW iron levels (<0.3 mg/L).
    Technologies such as adsorptive media, coagulation/filtration, and ion exchange are best suited for sites with relatively low iron levels in their source waters at less than 300 ug/L, the secondary MCL for iron. (C)

This process selection is very basic and the removal capacities depicted are meant to be a general rule of thumb.  It is important to run a General Mineral Analysis on your water to determine the best treatment approach.

Filtronics announces new EM-Mini low flow system for the removal of arsenic, iron, manganese and other metals.

Filtronics EM-mini SystemFiltronics EM-mini packaged water treatment systems are factory assembled, fully self-contained and specifically designed for applications 100 gpm or less. Coming in standard configurations, the EM-mini features a smaller footprint at the lowest capital cost in the industry making them perfect for budget minded small communities, schools, commercial or industrial facilites needinga simple, economical solution. To optimize performance, the EM-mini utilizes our NSF certified Electromedia® which allows for higher filtration rates, minimal chemical dosage, and never needs replacement.

Contact your local Filtronics Rep to learn more.

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