{"id":5014,"date":"2024-11-08T11:27:48","date_gmt":"2024-11-08T10:27:48","guid":{"rendered":"https:\/\/www.bluewatertech.it\/?page_id=5014"},"modified":"2025-09-17T11:01:30","modified_gmt":"2025-09-17T09:01:30","slug":"purification-and-recovery-plants","status":"publish","type":"page","link":"https:\/\/www.bluewatertech.it\/en\/plants\/purification-and-recovery-plants\/","title":{"rendered":"Purification and recovery plants"},"content":{"rendered":"\t\t
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Technologies for water recovery and chemical recovery and purification<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Blue Water Technology<\/b> realizes<\/b> demineralization plants for the recovery of industrial waters.<\/b> This equipment is widely used in the recycling of\u00a0 working water in the surface treatment industry such as electroplating, painting and phosphating.<\/span><\/p>\n

Another area of great interest today is the recovery of raw materials, in this case understood as chemical products. The recovery of these products offers a cost advantage by reducing the cost of their purchase, and it also prioritises the <\/span>reduction of pollutants discharged into washing water<\/b>.<\/span><\/p>\n

Ion-exchange resin filtration plants<\/b> are also of great interest in the purification of galvanic deposition baths from traces of pollutants. In addition to improving production, these filtration systems offer the advantage of reducing the frequency of other chemical-physical treatments of electroplating solutions, and in some cases even avoid their periodic disposal.<\/span><\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Ion exchange resin plants<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Another area in which <\/span>Blue Water Technology<\/b> strongly believes is the <\/span>recovery of raw materials<\/b>, not only in terms of economic savings for client companies but also from a sustainability perspective, i.e., reducing the amount of pollutants discharged.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Recovery of chemical<\/div>\n
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Another area in which <\/span>Blue Water<\/b> Technology <\/span>believes<\/b> a lot is the recovery<\/b> of raw materials,<\/b> not only in terms of <\/span>economic savings<\/b> for customer companies but also from a perspective of sustainability, that is to reduce the amount of pollutants discharged.<\/span><\/h3>\n<\/div>\n
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Recovery of hexavalent chromium from decorative chrome plating processes<\/div>\n
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In <\/span>decorative chromium plating<\/b> processes, as in most non-thick galvanic processes, the largest amount of chromic acid is discharged into the wash water: the chromium deposited on the workpiece is only 5-6% of the chromic acid used. In addition to the waste of raw material, this results in the consumption of chemical reagents and increased sludge production in the water treatment plant.<\/span><\/p>\n

Through an appropriate number of static washes and the installation of <\/span>resin plants<\/b> for the purification of the recovered chromium bath, using a vacuum evaporator it is possible to obtain a concentrate that can be used to replenish the bath. This technology allows a recovery of at least 90% of the chromium acid\u00a0 currently consumed.<\/span><\/p>\n<\/div>\n

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Recovery of nickel solutions from nickel plating processes<\/div>\n
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The <\/span>recovery of the washing solutions after nickel plating<\/b> takes place through selective membrane filtration plants. If properly dimensioned, these plants reduce by more than 90% the consumption of nickel sulphate and nickel chloride salts added periodically to the electrolytic deposition baths. Due to the nature of the deposit, this technique is most widely used in high drag productions such as barrel.<\/span><\/p>\n<\/div>\n

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Purification galvanic baths<\/div>\n
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The <\/span>purifying filters<\/b> most used are listed below.<\/span><\/p>\n

Nickel-plated baths purification plant <\/strong><\/h3>\n

Nickel baths<\/b> are subject to pollution by foreign metals, mainly iron, copper and zinc (the latter present when galvanizing pieces in zama). This pollution of the nickel-plating bath causes defects in deposit deposition, especially in surface areas subjected to lower stresses.<\/span><\/p>\n

Our <\/span>water purification plants <\/b>retain foreign heavy metals by continuously purifying the nickel-plating bath: once the exchange capacity has been exhausted, the resin must be regenerated to regain its exchange capacity.<\/span><\/p>\n

Plant purification baths of chromium trivalent (CR III)\u00a0<\/strong><\/h3>\n

Trivalent chromium-based deposition baths<\/b> are now increasingly used due to environmental restrictions, due to market needs due to the increasingly pressing demand to reduce the use of hexavalent chromium (Cr VI), and for greater resistance of the deposits obtained with these electrochemical baths to certain salt corrosion tests.<\/span><\/p>\n

However, one of the major difficulties in managing these deposition baths is their sensitivity to small traces of metallic pollutants, mainly iron and copper. Blue Water Technology designs and produces specific filtration systems capable of retaining the foreign heavy metals of trivalent chromate baths.<\/span><\/p>\n

Purification plant for passivation baths with chromium III <\/strong><\/h3>\n

Trivalent <\/span>chromium-based passivation <\/b>is one of the most common post-galvanizing treatments aimed at improving the resistance of the galvanized material. However, due to the pollution caused by a partial melting of zinc or by washing water with a low exchange rate, the amount of metallic zinc tends to increase until it decreases the resistance of the galvanized parts to salt spray tests. In these cases the only solution is to replace partially or totally the passivation bath.\u00a0<\/span><\/p>\n

In addition to an investment for the reformulation of the bath, this procedure creates an <\/span>environmental problem<\/b> for the disposal of the waste solution. Through special resins, it is possible to selectively and continuously remove the zinc inside the bathroom: in this way an optimal quality of the bathroom will always be guaranteed.<\/span><\/p>\n<\/div>\n

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Recirculation demineralisation plants<\/div>\n
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One of the areas of greatest use of <\/span>demineralization plants to recirculation<\/b>\u00a0 is the galvanic industry and surface treatment, in which large volumes of water are normally used for the washing of the parts to be treated. These waters contain <\/span>concentrations of pollutants<\/b>\u00a0 <\/span>which require<\/b> water purification before they can be discharged.<\/span><\/p>\n

In order to reduce water consumption and limit the use of chemicals and the production of waste sludge, <\/span>recirculating water demineralisation plants are used.<\/b><\/p>\n

The recirculating demineralisation plant<\/b>\u00a0 consists <\/span>of a<\/b> pressurisation pump, a mechanical and\/or adsorbent filter and an ion exchange resin <\/span>demineralizer<\/b>. The ion<\/span>-exchange resins<\/b>\u00a0 will treat the ions by returning demineralized water and must be regenerated with acid and soda once saturated, that is to say at an exhausted duty cycle. The regeneration process produces\u00a0 a concentrated liquid rich in pollutants that must be disposed of at external Alternatively, it can be combined with the other unrecirculated washing waters after batch precipitationtreatment and sent to the chemical-physical purification plant.<\/span><\/p>\n<\/div>\n

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Recirculating demineralization plants<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Are often used for the construction of water treatment plants with zero liquid discharge (ZLD): in this case the demineralizers will be used to recover the water from all the washes present.<\/span><\/p>

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In industrial contexts where production is high, the economic effort to create a “<\/span>zero-discharge\u201d plant<\/b> makes its implementation unfavorable. However, it is always possible to recover the washing water by installing recirculating demineralisation plants on those washing sites where a larger volume of water is normally required, for example after chromium plating, nickel plating, copper plating, anodic oxidation or phosphating.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Application sectors<\/div>\n\n