Resin plants


The softening is the process of partial removal of dissolved solids, to the aim to reduce the hardness of the solution. The great part of the incrustations of the superficial that are in contact with water having dissolved salts, is caused from the salts of bivalent metal ions and in particular calcium and magnesium, that with this type of resins is possible to replace it with sodium

Regeneration, totally automatic, is made nearly always with NaCl, in saturated solution said brine. Softening therefore, unlike the demineralization, does not remove the dissolved solid, but it chemically modifies them. The capacities of the plants can vary according to the plan requirement, plants also up to 100 mc/h are available.

Selective separation (Biodiesel By-products Valorization)

The use of catalysts in homogenous phase and of water for the separation of Biodiesel from the by-product glycerin induces products purification problem and problem about the treatment of the produced waste water. Regenerable resin technologies consent the purification of raw biodiesel without using water during the biofuel production process. The resin regeneration using methanol consents to recycle to the system by-products separated from the purified biodiesel. Resin technologies are also used for the neutralization of homogeneous catalyst, for the catalysis in heterogeneous phase and for glycerin purification to the aim to maximize the economic rent from the combined sale of biodiesel and glycerin.


Tecam realizes for demineralized water supplying for the several production section, demineralization plants with several dimensions and capacities. For this purpose Tecam uses ion exchange resins, just the hydrogen ions bound to the cationic resin are exchange with the cations present in the water, while the hydroxyl ions bond to the anionic resin are exchange with the anions present in the water. The ulterior refining of the water that come out from the anionic resin filter is feasible with a mixed bed filter, arriving therefore to a conductivity < 0.5 microS/cm.

Our systems are regenerable automatically.

The eluates are then sent to the existing treatment or can be treated in an evaporation section.

The dimensions of the plant vary regards to the characteristics of the input water, to the yields to catch up and the frequency of regeneration. Tecam realizes plants up to 120 mc/h.

Alimentary liquid valorization

Systems with ionic exchange resins processes, adsorbing, chromatographic to the aim to demineralize, to decolorate, to separate juices of alimentary nature: fruits (grape, apple, date), molasses and serum. The systems concur the separation and a recovery of by-products constituent the juices (organic acids, coloring substances, proteins, salts) to the aim to allow their economic valorization on the market.

Process water recycle

The applied principle is the same one described in the demineralization plants. The waters of rinse of the final washing tanks of the working lines, come continuously recycle on these systems of demineralization, in order to remove constantly the pollutants derived from the dragging defined from the job cycle. In this way production washings with levels of defined components and compatible with the production cycle are obtained.

Generally the configuration of the system is following:

– Filtration on carbon – when necessary – for the removal of organic substances

– Passage on strong cationic resin for the removal of the cations

– Passage on weak anionic resin for the removal of strong anions

– Passage on strong anionic resin – when necessary – for the removal of weak anions.

All the systems are equipped of appropriate automatism and visualizations for regeneration of the plant. The systems have several combinations and capacities based on the specific plan demands, Tecam has realized systems until 120 mc/h.

Metals and nitrates selective resins

With a simple chemical-physic treatment, it can turn out that the concentrations of metals for example copper, zinc, nickel etc, in the effluent from the system are above to the limits concurred from the norms. Therefore is opportune to install a section of final filtration (chemical-physical connection). Selective resins are used, that differently from those employees for the demineralization, have of the functional groups that they are tied to the metal in solution. Also in this case regeneration is completely automatic. Particular systems with continuous in counter-courent regeneration come used for the removal of nitrates.

Removal of Boron

In order to remove Boron from the final effluent of the chemical-physical treatment it is possible to apply a filtration section on detailed resins. Such resins are regenerable automatically and the eluates can be treat by evaporation or discharged outside. The capacities and amounts of resin are defined based on the Boron concentrations to remove, to the aim to bring back the effluent with concentrations inferior to the limits set up from the enforced norms, in particular for effluents discharged in superficial waters must be inferior to 2 mg/l.

Removal of Arsenic

The new drinkable waters normative D.L. 31/2003 and the norm on contaminated groundwater sites 471/99 obligate to reduce the arsenic concentrations present in the deep stratums destined to drinkable use and the reclamation of contantaminated sites under values of 10 /liter micrograms. A new technology by means of regenerable resin with FeOOH groups concurs to guarantee optimal removal performances to low costs of treatment (< 5 cent/mc) thanks to the periodical regeneration of the adsorbent media. The large-capacity to adsorption of the resin (2-4 g/l) concurs long operating cycles, with resin regeneration necessity 1 or 2 times year.