|
|
|
October,
2001
|
|
Volume
1, No. 3
|
Inside
this Newsletter
1.
Zebra mussels
2. Plastic piping & rubber gaskets
3. How do biofims form and how
do we fight them?
4. On line
5. Thought of the month
6. Anyone know the answers?
7. The ice man cometh
8. Desal and RO
9. Overview of Phosphate
Technology
10. Phosphate Performance vs. New Drinking
Water Regulations
|
|
|
 |
Zebra
Mussels
Zebra
mussels that plague power plants and drinking water systems
have a new enemy, SeaQuest manufactured in Atlanta, Georgia
by Aqua Smart, Inc.. This is the same safe product used for
years by numerous public and private water systems around
the world to control corrosion, scale, lead & copper,
distribution piping deposits, discolored water, and THM problems.
SeaQuest joins with liquid sodium hypochlorite treatment used
to control zebra mussel infestations.
The zebra mussel, and its imported relative, the quagga, represent
one of the most economically staggering problems to face power
and drinking water supply plants this century. By attaching
themselves to water pipes or anything they can get a hold
of, these damaging clams pollute drinking water, cut off flow
through cooling water, and clog intake valves. Most important,
they are life threatening when clogging safety system fire
fighting pipelines. Potential damage estimates to the Great
Lakes alone have exceeded $5 billion.
|
|
|
In attempts
to wipe out this problem, scientists have studied and learned
more about the zebra mussels life cycle. It is now known
that zebra mussel spawning periods start earlier and end
later in the year than previously thought. Also, the average
female has the ability to produce over one million eggs
yearly compared to previous thought 40,000. Today scientists
know that infestations have spread much quicker than first
predicted from Northeastern Canada to Florida and from New
York to Denver. In addition, because spawning can occur
in water temperatures down to 44¾F, the infestations in
the southern part of the US could last year-round.
Extensive research is seeking new treatments because current
methods have problems:
1. Thermal shock this is limited to only a few power
facilities having the design ability to use this approach,
2. Scraping this includes physical removal of mussels
from the pipelines using divers, cleaning with compressible
polyethylene plugs (known as pigs), or manually pressure
cleaning. All are time-consuming and costly.
3. Chlorine or bromine gas this requires that a potable
water supply be available to maintain and operate the treatment
system and that air scrubbers filter polluting exhaust.
Because of possible dangerous leaks and other handling hazards
associated with chlorine and bromine gas, many power plants,
manufacturing plants and municipalities are required by
their insurance underwriters to switch to liquid sodium
hypochlorite.
4. Potassium permanganate this is considerably more
expensive than chlorine treatment. Also, residual manganese
can cause piping tuberculation or pinkish discoloration
in finished water.
5. Non-oxidizing cationic surfactant biocides use
as a molluscide is currently approved in only a few states,
and there is great concern as to its long term effect on
the environment.
6. Liquid sodium hypochlorite this treatment is most widely
used because it is extremely effective & costs less
than all other options.
However, there
are three operating problems:
a. corrosion deposits build up within the liquid sodium
hypochlorite feed lines and water intake lines,
b. stalagtite hard water deposits build up within the liquid
sodium hypochlorite feed lines and water intakes.
c. gassing within the intake lines causes cavitation
of the liqiuid sodium hypochlorite feed pumps.
The first two problems impede the treatment, while the third
problem stops the treatment altogether. When SeaQuest is
added directly to the liquid sodium hypochlorite tanks (or
drums), all three operating problems disappear and effective
continuous control is reestablished.
One example of
this success occurred at a major northeastern system, heavily
infested with zebra mussels. First they used liquid sodium
hypochlorite to prevent clogging their intake lines. When
they discovered hard water/corrosion deposits severely restricting
the flow of treatment, they were forced to hire divers to
manually scrape these deposits at a cost of $20,000 per
dive. But after only 2 weeks, the problem returned. To get
rid of the problem permanently without spending more money
on divers, they decided on SeaQuest. After several SeaQuest
applications, the deposits were removed and full design
flow capacity returned.
At another northeastern system, a gassing problem
developed just where the sodium hypochlorite feed entered
into the intake line. This gassing built up
so much pressure that the liquid sodium hypochlorite feed
pumps stopped pumping. After several SeaQuest applications,
the problem disappeared totally and never returned upon
continued use of SeaQuest.
Zebra
mussels that plague power plants and drinking water systems
have a new enemy, SeaQuest manufactured in Atlanta, Georgia
by Aqua Smart, Inc.. This is the same safe product used
for years by numerous public and private water systems around
the world to control corrosion, scale, lead & copper,
distribution piping deposits, discolored water, and THM
problems. SeaQuest joins with liquid sodium hypochlorite
treatment used to control zebra mussel infestations.
The zebra mussel, and its imported relative, the quagga,
represent one of the most economically staggering problems
to face power and drinking water supply plants this century.
By attaching themselves to water pipes or anything they
can get a hold of, these damaging clams pollute drinking
water, cut off flow through cooling water, and clog intake
valves. Most important, they are life threatening when clogging
safety system fire fighting pipelines. Potential damage
estimates to the Great Lakes alone have exceeded $5 billion.
In attempts to wipe out this problem, scientists have studied
and learned more about the zebra mussels life cycle. It
is now known that zebra mussel spawning periods start earlier
and end later in the year than previously thought. Also,
the average female has the ability to produce over one million
eggs yearly compared to previous thought 40,000. Today scientists
know that infestations have spread much quicker than first
predicted from Northeastern Canada to Florida and from New
York to Denver. In addition, because spawning can occur
in water temperatures down to 44¾F, the infestations in
the southern part of the US could last year-round.
Extensive research is seeking new treatments because current
methods have problems:
1. Thermal shock this is limited to only a few power facilities
having the design ability to use this approach,
2. Scraping this includes physical removal of mussels from
the pipelines using divers, cleaning with compressible polyethylene
plugs (known as pigs), or manually pressure cleaning. All
are time-consuming and costly.
3. Chlorine or bromine gas this requires that a potable
water supply be available to maintain and operate the treatment
system and that air scrubbers filter polluting exhaust.
Because of possible dangerous leaks and other handling hazards
associated with chlorine and bromine gas, many power plants,
manufacturing plants and municipalities are required by
their insurance underwriters to switch to liquid sodium
hypochlorite.
4. Potassium permanganate this is considerably more expensive
than chlorine treatment. Also, residual manganese can cause
piping tuberculation or pinkish discoloration in finished
water.
5. Non-oxidizing cationic surfactant biocides use as a molluscide
is currently approved in only a few states, and there is
great concern as to its long term effect on the environment.
6. Liquid sodium hypochlorite this treatment is most widely
used because it is extremely effective & costs less
than all other options.
However, there are three operating problems:
a. corrosion deposits build up within the liquid sodium
hypochlorite feed lines and water intake lines,
b. stalagtite hard water deposits build up within the liquid
sodium hypochlorite feed lines and water intakes.
c. gassing within the intake lines causes cavitation
of the liqiuid sodium hypochlorite feed pumps.
The first two problems impede the treatment, while the third
problem stops the treatment altogether. When SeaQuest is
added directly to the liquid sodium hypochlorite tanks (or
drums), all three operating problems disappear and effective
continuous control is reestablished.
One example of this success occurred at a major northeastern
system, heavily infested with zebra mussels. First they
used liquid sodium hypochlorite to prevent clogging their
intake lines. When they discovered hard water/corrosion
deposits severely restricting the flow of treatment, they
were forced to hire divers to manually scrape these deposits
at a cost of $20,000 per dive. But after only 2 weeks, the
problem returned. To get rid of the problem permanently
without spending more money on divers, they decided on SeaQuest.
After several SeaQuest applications, the deposits were removed
and full design flow capacity returned.
At another northeastern system, a gassing problem
developed just where the sodium hypochlorite feed entered
into the intake line. This gassing built up
so much pressure that the liquid sodium hypochlorite feed
pumps stopped pumping. After several SeaQuest applications,
the problem disappeared totally and never returned upon
continued use of SeaQuest.
|
|
Aqua
Smart Inc. 4445
Commerce Drive SW, Suite A4, Atlanta, Georgia 30336 USA
1-800-AQUASMART |
|
|
|