EQUILWIN features

This software is a calculation program, according to known and tested method in water treatment speciality : HALLOPEAU & DUBIN method, to modify, supplement and implement by the author (Software Protection : Act 92-597 of 1 July 1992 on the Intellectual Property Code).
(contact the author for a price quot - not downloadable software).
See : J. Hallopeau - " Les équilibres carboniques dans les eaux " - Terres et Eaux, 1960/1961.

All formulations are explainable : thermodynamic laws, equilibrium equations, acido-basic reactions, etc.
Proposed option are according as study and treatment of natural waters.
And also, it test by many usage : laboratory studies or "in the field" (treatment station for drinking water and industrial waters), including automatic tryouts.
For calculations with iteration procedure, it use dichotomic method, which to allow more fastness to good accuracy : mathematic feedback value = from 0.01 to 0.1 according to events.

- EQUILWIN is a software coded to run under Windows. No problem using interfaces WINDOWS 7 to 10 (32/ 64 bits).

Please Note - Equil v5/v6, old version was developed with Quick Basic V4.5, and thus, is a software running under DOS command prompt (Windows <Vista).
Mouse is not usable : most actions are controlled by the keyboard key presses (numbers or letters).
So, majority of actions are ordered with keyboard, by presses on keys (figures or letters).
Very often it should be noted that the required answer Y(es), and key "Enter", are equivalent.

Program bounds.

The pressure is close to atmospheric pressure.
With regard to calculation of pH, program account of an acidity which holds can be noncarbonic (sulphuric, hydrochloric, etc) and in this case, uses formulas of pKa.
In principle, EQUILWIN program announces all excessive introduced or calculated values, and, in majority of cases, continuation of calculations is allowed.

The majority of water treatments are available and allows to simulate the chemical action in ionic equilibrium such as calcium/carbonates/CO2 balance.

Only five parameters are needful for current calculations :
Temperature, pH, alcalinity, calcium and dry residue (else conductivity or resistivity).

Initial reference is requested, but this is optional.

At program startup, before the introduction of the main parameters needed for the calculations.
(for printers networks, see your manager).

NB. Equilwin for : registration of each water or session (persistent or not).

Main calculations.
Next first data input (5 parameters), values are found as follows (Equilwin picture of aggressive water example) :

Note : CCPP (calcium carbonate precipitation/dissolution potential) : defines the mass of CaCO3 to be (theorically) precipited from, or dissolved into, a water to attain saturation with respect to CaCO3.
In this last case (dissolved), CCPP has a negative value.

On the other hand, tendancy direction of water is indicated : aggressive, scaling or in equilibrium (balance) ; and also proposition of correction (stabilization / recarbonation).

Equilwin example (agressive water) :

Next these results, potential choices :

Some choices according as water treatments, but are used, only to simulate action on calcium-carbonic equilibrium.
Note : for the majority of proposed chemicals, demand input of purity input (pure product amount) in %.

Correction of aggressivity (stabilization) :
Allows to decrease acididy of water.
(should the occasion, until equilibrium pH [pHeq]

Example (Equilwin picture) :

In addition, for all reagents the purity (% of pure product) can be introduced (optional).

Flocculation (coagulation) :
Allows to simulate coagulation (process of agglomeration and precipitation of particles).

Can test itself by action to introduce of coagulant reagent (6 products).

Note : proposed menus allow,

Please, note that values of increase in some elements (not introduce at beginning) are announced: sulphates and/or chlorides.

Adjustment of pH value :
Allows to simulate acid or basic action.
Example - Equilwin picture :

Remark : this option will be present in other menus (Equil 6), to change pH of water, before or next treatment.

The pH decreasing (acidification), if that's possible, (control by program), can be carried out by 6 reagents :

Also, 4 basic reagents are proposed :

And, for all reagents, purity (pure product %) can be introduced (optional).
It should be noted that values of increase in some elements (not introduce at beginning) are announced: sulphate, chloride or sodium.

Equilwin example (wanted pH : 7.5, lime as 80% of purety) :

Recarbonation :
Allows to increase bicarbonated-calcic mineralization.
(should the occasion, until equilibrium pH [pHeq]
EquilWin test recarbonation by action of :

Note : calculation stop is with wanted alkalinity, and/or with alkalinity AND pH value if lime used).

(Equilwin picture)

Allows to reduce bicarbonated-calcic species or calcium.
(three options, after introduction of desired calcium value)

Is therefore :
- Use of alkaline reagent :

- Ions exchange resins (input of Total Hardness or magnesium), sodium.

Remark : this program is not a dimensioning software for device and ion exchange product, it's just one approach of resin volumes to use (cationic resin), and water to be treated (calculation of by-pass).

Adding reactive.
Dosage of reagents (addition) :
Allows feed of chemicals (the metered addition of a reactant).

(Equilwin picture)

Is therefore : 4 tasks,

Water Blending :
Allows to mix waters to watch balance variations.

(Equilwin picture)

. we can test the mixture of initial water in memory (or registered Equilwin water), with a second water, which we introduce the five essential parameters.
Also, a graph is drawn, also we can determine the final condition of a water after blending several waters for variant fractions.

Larson Ratio
(corrosion index or Larson Ratio [LR] ) :
Allows the calculation of corrosion index for metals, according to Larson Ratio.
Calculation callback : sum [sulphate x 2] + chloride, opposed to alkalinity :

(2SO4 + Cl) / Alk

Values expressed in mol/liter.

This calculation is carried out on the water in characterization (currently).

(Equilwin picture, example)

Special menus in EQUILWIN.
View >>> on these web pages (software interface)

Note: security.
Checks are carried out during or at the end of the various calculations to report impossibilities, not to exceed the limits or inconsistent results.
Depending on the type of calculation and the possible consequences, EQUILWIN can stop the calculations and explain why. Calculations can then continue or not (choices given).

Pierre Ravarini - August 2015.