THE EFFECT OF MAGNETIC FIELD ON WATER HARDNESS

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Thirteenth International Water Technology Conference, IWTC 13 2009, Hurghada, Egypt
117
THE EFFECT OF MAGNETIC FIELD ON WATER HARDNESS
REDUCING
H. Banejad 1 and E. Abdosalehi 2
1
Ph. D., Assistant Professor
Irrigation Dept. Agriculture Faculty, Bu_Ali Sina University, Hamedan, Iran
E-mail: [email protected]
2
M. Sc. Irrigation Dept. Agriculture Faculty,
Bu_Ali Sina University, Hamedan, Iran
E-mail: [email protected]
ABSTRACT
In this study magnetic field intensities of zero Tesla (as a witness), 0.05 Tesla,
0.075Tesla, and 0.1 Tesla, were examined. Also, it has chose amounts of water
influent 4lit/h and 30lit/h. With doing examination by 3 times and analyze the results
with SAS software, have shown that changing magnetic field intensity, amounts of
water influent, and also together influence there factors, have significant effects at
level of 99 percent on reducing of water hardness. In the other way, for finding their
mechanisms, analyzes done by X ray. Calcium carbonate exists in two forms, calcite
and aragonite. But the main form of sediment is calcite. Results showed that amount of
aragonite in compare with calcite, by attention to situation, increased 70 percent to
99.99 percent and ratio between calcite/aragonite had a main reducing.
Keywords: magnetic field, water hardness, calcite, aragonite.
1. INTRODUCTION
The water hardness is one of the most important of propounded cases on water
treatment, specially consumed water on industrial. In principle, the water that is
flowing in surface land or saving in subsurface land, for the reason that passing from
various levels, that have contain the cations and anions of Calcium and Magnesium,
informing of carbonate, hydrogen carbonate or sulfate, is comprising the various salts,
that the part of pertain to Ca2+ and Mg2+, is call water hardness (Habibi [12]).
Determinate of water hardness is necessary experiment for assess the water quality on
industrial and domestic parts. In industrial part, is important accomplishing this
experiment, for the reason that hard water, while heating make, sediment the calcium
carbonate, and consequently to closed the tubes (Tavasoli & Khalili [28]). The most
current matter that has made sediment on carbonate water and non-carbonate water in
dry zone and half-dry zone is sediment of calcium carbonate. The most important
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Thirteenth International Water Technology Conference, IWTC 13 2009, Hurghada, Egypt
factors on emitter obstruction is carbonate (Alizadeh [2]) and sulfate of calcium and
magnesium (Alizadeh & Khiabani [3]). To take care of magnetic science, has started
by observation some of mineral stones, that to be able attracting iron particles. Origin
of magnetic word is Magnesia zone that is situated in Asia, and knew mentioned above
mineral stone on there, that named Magnetic. Magnetic field is importing deviated
force on portable electrical charge (Alghabi et al [1]). Indicated results of some
research that, magnetic field, changing the process of sedimentation calcium carbonate
(Fathi et al [7]). Magnetic treatment has been employed for more than a half century.
The first commercial device was patented in Belgium in 1945 (Vemeiren [29]).
Powerful electromagnets were used in hot water systems since the 1960s in the Soviet
Union (Grutsch [10]). The application of magnetic treatment was reported in the
United States since 1975 (Grutsch & McClintock [11]). The phenomenon of water
treatment with an applied magnetic field has been known for many years and has been
reported as being effective in numerous instances (Kobe et al [15]). Despite its
ubiquity this science, there is relatively little scientific literature on magnetic water
treatment. It is not clear how or even if, it works (Coey & Cass [6]). In many industrial
processes, that use natural water supplies scale formation is a common and costly
problem. Magnetic water treatment (MWT) plays an increasing important role among
chemical water conditioning methods regarding scale control and amelioration of
dispersion separations (Lipus et al [18]). The laboratory-based study tested the effect
of treating solutions and particulates of CaCO3 and showed that a repeatable magnetic
effect on precipitation is observed (Kney & Parsons [14]).
In many cases, the field is delivered by permanent magnets in various geometrical
configurations. Several devices are based on AC or pulsed fields (Oshitani et al [24]).
Ferreux assumed that the free enthalpy of calcium carbonate formation would be
modified by the magnetic field (Ferreux [8]). The scaling power of the treated water
was estimated through an electrochemical scaling test (Gabrielli et al [9]).
Lundager Madsen has concluded that the field accelerates the crystallization of
sparingly soluble diamagnetic salts of weak acids such as carbonates and phosphates.
He suggested that MF is able to change the orientation of the proton spin and to disturb
dehydration phenomena by hindering the transfer of the proton to a water molecule
(Madsen [19] & Madsen [20]). The magnetic field (MF) would be able to disturb the
double ionic layer surrounding the colloidal particles and their zeta potential (Parsons
et al [26]). Recently, it has been shown that the profile of the flow of a conducting
solution in a pipe is perturbed when a magnetic field is applied (Martemianov &
Sviridov [21]). The magnetic treatment has a significant effect on water quality of
irrigation (Bogatin [4]). Enhancement of coagulation by particle alignment has been
considered and demonstrated an increased rate of aggregation, as determined by
sediment weight, from treating a static solution with magnetic field (Wang et al [31]).
Results show that the compressive strength of mortar samples mixed will magnetic
water of 0.8 – 1.35 T increased 9-19 % more than those mixed with tap water (Nan Su
et al [23]). However, if magnetic water is used instead, water molecules can easily
penetrate into the cement particles, allowing a more complete hydration process to
occur and enhancing the mechanical strength of concrete (Wang [30]).
Thirteenth International Water Technology Conference, IWTC 13 2009, Hurghada, Egypt
119
The following are the most recognized benefits of magnetic water treatment for
various water-using equipments:
Prevents pollution
Reduces energy
Conserves water
Saves time and money
Lengthens service life of existing fluid movement equipment
Eliminates existing chemical cost to inhibit scale
Reduce the need for periodic acid cleaning
Increasing protection against corrosion within the system
Eliminates continual operating cost as compared to chemical system (Brower
[5]).
Using magnetic water treatment, industrial and agriculture processing will change, and
foods, cosmetics and sanitation, etc. might be improved (Otsuka & Ozeki [25]). As the
solubility of CO2 gas decreases with increasing temperature or decreasing pressure, the
solution tends to restore the equilibrium (1) by the shift toward CaCO3 precipitation
(Lipus & Dobersek [17]).
Ca(HCO3)2(aq)
(1)
CaCO3(s) + CO2(g) + H2O
Precipitated CaCO3 may be a mixture of various phases: crystalline phases, amorphous
and hydrated phases. The crystalline phases are:
Calcite (with trigonal structure, usually in form of rhombohedral crystals),
Aragonite (with orthorhombic structure, often in form of needle-like crystals)
and
Vaterite (with hexagonal structure, often in form of spherical crystals)
(Lippmann [16]).
Among these phases calcite is thermodynamically the most stable at ambient
temperature and atmospheric pressure (Rudert & Müler [27]).
The most abundant cation to formed calcium carbonate soils crystal, is calcite and
aragonite, that aragonite is permanent half in compare of calcite [Table 1] (Karimian
[13]).
Table 1: Equilibrate Constant of aragonite and calcite (temperature of 25° and pressure
of 1 atmosphere)
Log K˚s
-8.22
Reaction
CaCO3 ( s ) ⇔ Ca 2 + + CO3
2−
-8.35
CaCO3 ( s ) ⇔ Ca 2 + + CO3
2−
Material
Aragonite
Calcite
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Thirteenth International Water Technology Conference, IWTC 13 2009, Hurghada, Egypt
Aragonite has a orthorhombic system and organized of pure calcium carbonate. Calcite
has crystallized in orthorhombic class and hexagonal system. Chemical stability of
calcite is more than aragonite (Musavi Herami [22]).
Target of this research is survey of magnetic field effects on changing of water
hardness. This research has considered effect of changing of magnetic field intensity,
and amount of water influent on water hardness reducing.
2. MATERIALS AND METHODS
In order to survey of magnetic field effect on hardness water reducing, has done water
treatment experiment in present of magnetic field, in Water Quality Laboratory
(Agriculture Faculty).
2.1. The method of preparing magnetic field
This device is containing of seven U shape magnet, with north pole and south pole
(Figure 1), That have consoled in form of same axis and is create length equal 25 cm
on the magnetic field.
Figure 1: Sample of magnet with north pole and south pole
This magnet is formed from central nucleus that has twisted of copper suggested
armature with determining round number on that. It has used from 300 gram copper
wire, for each magnet, in such a manner copper wire has twisted as handmade round of
central nucleus.
For being the work, calculated magnetic field intensities on Electronic Laboratory in
Bu-Ali-Sina University. For measuring magnetic field intensity of each magnet, we
used the magnetic balance. The magnetic field intensity of magnets is calculated by
reading the magnetic balance force (equation 2).
B=
F × 10−5
i×L
In this equation:
(2)
Thirteenth International Water Technology Conference, IWTC 13 2009, Hurghada, Egypt
121
B is a magnetic field intensity according to Tesla, F is a read force amount by
magnetic balance (that calculated according to Newton by to multiply on 10-5), i is a
flow intensity on magnetic balance according to Amperes, L (according to cm) is
length of part of balance that magnet is consoled on this part. In this balance L
equivalent is 2 cm and I is equivalent 1 Amperes that worked with voltage of 5 V.
Also, hinder this system in order to prevent of warmth interchange with environment.
2.2. Samples
Because has accomplished experiments on 4 level of magnetic field intensity, 2 level
of water influent; it has take action of factorial plan 4×2. Then we analyzed data by
drawing of connected tables. Statistical accounts have done in this research by SAS
software and also analyzed by X-ray. Then drew connected graphs, careful of results.
It is necessary to say that we do not publishing all graphs, for the reason that has a
limited on number of article pages.
2.2.1. Magnetic field intensity
In order to study effect of magnetic field intensity in experiment, selected 4 level of
magnetic field intensity, with zero Tesla (as a witness), 0.05 Tesla, 0.075 Tesla and
0.1 Tesla, or, in other word, in order to compare, has done experiment without
magnetic field as a witness.
2.2.2. Amount of water influent
In order to survey effect the amount of water influent on results, has done experiments
on 2 level of water influent (with amount of 4 and 30 lit/h).
2.3. Experiment
In order to reduce error and increase carefulness coefficient on experiment, all the
experiment has been repeated 3 times.
Indicated to accomplish states of experiment in presence, various intensity of magnetic
field, amount of water influent, (Table 2).
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Thirteenth International Water Technology Conference, IWTC 13 2009, Hurghada, Egypt
Table 2: Process of experiment
Number the
repeat
3
3
3
3
3
3
3
3
Water influent
(Lit/h)
4
30
4
30
4
30
4
30
Intensity of magnetic
field (Tesla)
Zero( as a witness)
Zero( as a witness)
0.05
0.05
0.075
0.075
0.1
0.1
Process of
experiment
1
2
3
4
5
6
7
8
Calculated treatment efficiency after done experiments by equation (3), that [H]i is
hardness of water sample before magnetic treatment and [H]f is hardness of water
sample after magnetic treatment.
Em =
[H ]
i
− [H ]
[H ]
f
× 100
(3)
i
2.4. Water chemical analyze by X-ray
Studied form of crystals and sediment of calcium carbonate in presence of magnetic
field in order to consider of process of sediment on water flow systems. This
measuring has done on Geology laboratory of Bu-Ali-Sina University.
Target of this work, was study of particles size and particles number of calcium
carbonate that existed on water sample and also kind of particles that were available in
water in forming of aragonite and calcite. Device X-ray used in this experiment was
Cu k , Ital structure and worked by copper lamp. The vertical axis on drawn graphs in
article is intensity and horizontal axis is twice as much of angle that is called
background, usually. Analyze have done in limited of 2 angle, from 5 angle until 60
angle in steps of 0.1. In total, 5501 repeats and drawing graphs by Excel software have
been done.
2.5. Consideration of crystals by using of electronic microscope
In order to study of calcium carbonate crystals before and after magnetic treatment
considered pictures by electronic microscope.
Thirteenth International Water Technology Conference, IWTC 13 2009, Hurghada, Egypt
123
3. RESULTS
It has been organized factorial plan in order to analyze of water hardness reducing in
presence of magnetic field, and consideration any factors of magnetic field intensity,
water influent, and also reciprocal effect this factors, and inserted results in table 3.
According the results of Table 3, inference that the effect of magnetic field intensity
factor and amount of water influent, on magnetic field, on water hardness reducing,
had a meaning in level 99%. Also reciprocal affect this factor together has been mean
in level 99%. It mean that, when the other factors is constant, to be different water
hardness reducing amount, in comparison different levels any remainder factor, and it
will show manifest different. It has used from Dankan test in order to recognition
different samples. Inserted on Table 4 resulted of Dankan test for water hardness
reducing in level 99%. In this table has not manifest different together, samples that
have a common letter at least.
Table 3: Variance analyze for factorial plan of water hardness reducing
SV
(changing source)
Intensity of magnetic
field
water influent
Intensity of magnetic
field water influent
Error
Total
df
SS
(sum of
squares)
MS
(average of
squares)
3
13052.04
4350.68
1
65.30
65.30
3
40.71
13.57
16
23
0.057
13158.12
0.0035
Pr > F
In Table 3, F is an intensity of magnetic field and R is a amount of water influent.
According to Table 4, it showed Dankan test results, the least of efficiency in case
witness sample (without magnetic field)with zero Tesla, is zero percent and greater of
efficiency in sample with intensity of magnetic field 0.1 T and amount of water
influent 30 Lit/h.
Table 4: Results of Dankan test for water hardness reducing
Without
MF
4
F
Intensity of magnetic field (Tesla)
Without 0.05
0.05
0.075 0.075
MF
Water influent (Lit/h)
30
4
30
4
30
F
E
D
D
B
0.1
0.1
4
C
30
A
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Thirteenth International Water Technology Conference, IWTC 13 2009, Hurghada, Egypt
In this table has not manifest different together, samples that have a common letter at
least.
3.1. Role of magnetic field intensity in efficiency of magnetic treatment
Results from all graphs show that the efficiency of magnetic treatment is zero, when
there is no magnetic field. It has changed the efficiency of magnetic treatment when to
consoled water in magnetic field. Also, in the same manner, it will increase the
efficiency of magnetic treatment, when magnetic field intensity is increasing.
3.2. Role of amount of water influent on magnetic treatment efficiency
Efficiency of the treatment increased with increasing of amount of entrance of water
flow from 4 until 30 lit/h (Figure 2). We can say that increasing the amount of enter
water flow is occasion the water flow is turbulence and is a whirlpool situation that
due to reduced sediment of CaCO3.
Efficiency of magnetic
treatment(percent)
35
30
25
20
15
4lit/h
10
30lit/h
5
0
0
0.025
0.05
0.075
0.1
Intensity of magnetic field(Tesla)
Figure 2: The comparison of water hardness reducing in presence of MF and without
MF in states of various water influent
3.3. Results of chemical analyze by X-ray
Result of chemical analyzes by X-ray shows that in presence of magnetic field,
produced aragonite more than calcite. The experiments show that the amount of
aragonite in sediment of CaCO3 has increased to 70 percent and this increased is to
99.99 percent according to magnetic field intensity and other factors and situation. The
Thirteenth International Water Technology Conference, IWTC 13 2009, Hurghada, Egypt
125
results of X-ray show that CaCO3 in form of calcite and aragonite usually is available.
In non-magnetic water is available CaCO3 in stable situation, instate of calcite crystal,
after magnetic treatment it had reduced the size and greater particle number. Down
drainage to ensue of X-ray have analyze in Figure 3.
1200
3800
Aragonite
Calcite
1000
3300
2800
800
Intensity
2300
600
1800
1300
400
800
200
300
0
-200
0
10
20
30
40
50
60
70
Background(2Teta)
Figure 3: Results of X-ray before and after of magnetic treatment (above graph is before
MT and blew graph is after MT)
The peck has consoled on background of 29-30 in case calcite, and the peck in case of
aragonite, has consoled on other background (other than 29-30). In the same manner
that seen the chief of sediment it was calcite before magnetic treatment and it changed
to aragonite after magnetic treatment. The reason of non-sediment and increasing of
water hardness is transformation of CaCO3.
3.4. Results of electronic microscope
It has seen the accruing picture of electronic microscope in Figure 4. This picture
shows the crystals of CaCO3 that was found in form of calcite on hard water. in the
picture of right side shown the smoother and clarifier, that is aragonite in left side
picture, that productive after crossing of magnetic field. This crystals do not stick
together and do not stick itself on walls of tube and device, and crossing from among
them simplicity and non-determinate.
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Thirteenth International Water Technology Conference, IWTC 13 2009, Hurghada, Egypt
Figure 4: Crystals of calcium carbonate (before and after MT)
4. CONCLUSION
Experiments have shown that the magnetic field affected on water quality and that
production of magnetic water has an ability on water hardness reducing until
51 percent .The factors of magnetic field intensity, situation of magnets setup, amount
of enter water flow and enter water hardness has a significant effects on water
hardness reducing and increasing of treatment efficiency in level 99 %. Increasing on
amount of enter water flow and increasing on magnetic field intensity, has culminated
in increasing efficiency of treatment, and in results, reduced of water hardness. Setup
of magnets inform of inversion, shown increasing the efficiency rather than state of
non-inversion. The results of water chemical analyze shown that after magnetic
treatment, has reduced size and greater particles number.
The magnetic treatment has increased amount of aragonite in sediment of CaCO3 to
70 percent. This increase is being to 99.99% according to the magnetic field intensity
and other factors.
Advantage of this treatment is avoiding the using of dangerous chemical materials and
expensive for human and environment. With magnetic water (without adding any acid,
chemical materials and poisonous materials to water) sediments of available on surface
in touching with water (that they built-up since before), removal, and also avoid of
making the new sediments.
Acknowledgments
We are most appreciation of honorable professors of Agriculture Faculty, Chemistry
Faculty, Engineering Faculty and Department of Physics for a teamwork and
collaboration.
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