Videur Technologies Pvt. Ltd.

Experience in the field as follows

1st Chromic Acid plant supplied by GOEMA with me in 2008 to LMW Coimbatore for Chromic Acid recovery working satisfactory till today.

Visited in 1998 USA / Europe and brought Diffusion Dialysis and Micro Filtration systems. However the cost was high unaffordable by the industries.

Ion exchange Resin base Acid retardation system is also available however it leaves same amount of acid untreated which is once again the problem for disposal. It also requires same amount of Pure DM or RO Water.

We provide special Microporus HDPE units for filtration of solids and the quality is same as Acid retardation process and no waste.

Treatment of acidic rinse water is still remains where we provide proper solution.

The acid in pickling baths and that in electroplating picking baths can be recovered.

Degreasing baths in electroplating are also recovered and subsequent baths will be also clean.

Rinse criteria and rinse technologies are very important based on same water consumption and discharged is minimized.

Metal recovery is offered in electroplating and zinc plating galvanizing

Zero liquid discharge and zero solid waste is the concept.

RESOURCE RECOVERY Videur Technologies Pvt. Ltd.

Applications VD Dialysis features
RECOVERY of ACIDS from Pickling Bath
RECOVERY of ACIDS from metal finishing Bath
RECOVERY of ACIDS from Electroplating solutions
RECOVERY of ACIDS from Uranium processing
RECOVERY of ACIDS from Carbonization processing Low operating costs * requires virtually no energy * Attains high recoveries (60-100%) * significantly reduces waste disposal Costs Simple control * easily automated
Minimal operator attention * Low capital cost Modular easy expansion

Recovery of acids and simultaneous separation of dissolved metals

The waste acid and the water are supplied in countercurrent along anion – exchange membranes. Due to the osmotic pressure the acid anion diffuse through the membrane to the water side whereas the cat ions are retained on the waste acid side. It is not required to use electric energy for the diffusion dialysis process.
The regenerated acid (diffusate) is returned to the process. The metal salt solution (dialyzate) depleted of free acid is supplied to a neutralization or to a further second regeneration stage.

In comparison with the retardation process:
When separating the same quantity of metal from a solution, virtually double the amount of waste acid has to be fed to the regeneration system, due to the metal separation rate of appr.55% for the retardation process. Therefor the efficiencies for the free acid indicated for the retardation process are reduced by half, and larger acid quantities are drained to the neutralization compared with the VD dialysis.

VD dialysis is a concentration gradient-driven separation process. The dialysis system uses an ion exchange membrane which is permeable to negatively charged ions and hydrogen ions, but not other positively charged species. The dialysis technique is primarily used to separate and purify acids from their respective salt solutions. This is done by selectively allowing the hydrogen ion and anion of the salt to permeate through the anion perm selective membrane. The process is driven by the concentration difference between the solutions. In this way hydrochloric, sulphuric, nitric and other acids can be recovered from acid waste streams.

When using the VD dialysis, it is possible to treat the following mineral acids obtaining high recovery rates:

Nitric acid: up to 95%
Hydrochloric acid up to 85%
Sulphuric acid: up to 85%
Hydrofluoric acid: up to 80%

Moreover , the VD dialysis has a high selectivity with regard to the separation of metal ions:
Mixed acid (HNO3/HF): >95%
Hydrochloric acid: >90%
Sulphuric acid : >90%



Metal surface treatment in pickling lines use:
– Hydrofluoric acid (HF)
– Sulfuric acid (H2SO4)
– Nitric acid (HNO3)
– Hydrochloric

These chemicals are only partially spent. The spent acids, free acids, dissolved metals and pickling sludge exit the process bath.

Before the solution can be disposed of, a pretreatment must take place.

During this process the total liquid quantity is neutralized with lime. The precipitated metal hydroxides are filtrated and the filtrate is then discharged, including its high salt content (e.g. nitrates), as normal waste water. The sludge has to be disposed appropriately.

This process is costly and is harmful to the environment, but there are other alternatives:



VT-Regeneration- Processes set new standards

90% or more Regeneration of Free Acids.

97% or more Regeneration of Bound Acids.

99% or more Regeneration of Metals.

Approximately 100% Recycling of Process Water

Approximately 100% Recycling of Neutralization Agent (KOH)

VT-Regeneration- Processes are economical

Reduce costs of:
– environmental risks
– acids
– neutralization agent
– sludge disposal

VT-Regeneration- Processes are environmentally beneficial

Reduction of salt content in waste water (throughout the process)
No spent waste water

VD Dialysis
Is a simple ion exchange membrane process that separates ionic, non- ionic or colloidal species from an aqueous acid, base, or salt solution based on differences in diffusion rates, using the concentration difference across the membrane as the driving force. Since no outside energy is required, the equipment is simple and safe to operate, and the process is virtually energy and maintenance free.

VT adjusts the component system to the requested performance data, not to the pickling line demand. Components can be easily added to each other at all stage. The system components allow for adjusting to current and future requirements.

TECHNOLGY 261, Bhagirath Society, Ghodasar, Ahmedabad-380 050 INDIA
Tele: + 8306799945/9377778300, E-mail:

Are you ignoring a profit center?
Are you squandering your long term future?
Are you throwing resources away?
Stop the waste!
Your liability is an asset!

Reduce Operating Costs
Recycling Waste Effluent
Recover Valuable Resources
Transform Costly Liabilities into Assets
Create a New Profit Center
Process Chemicals Efficiently.

RECOVER : Salts Acids Bases

INDUSTRIES SERVED: Chemicals, Stainless Steel, Pulp & Paper, Food & Pharmaceutical

Many industrial fields are now using full scale similar system for specialty process separations in both resource recovery and waste minimization applications such as acid and base purification. These industries include the steel industry for metal pickling, the metal cleaning industry, aluminum milling and anodizing, electroplating and the petroleum industry for caustic cleaning. Over 100 commercial similar systems are operating worldwide.




Cross flow Microfiltration with Periodic Backwashing

Process for Continuous Separation of all Solids (> 0.5 m) from Liquids

In the field of surface technology solid containing waste solutions are produced. Both for ecological and economical reasons these solutions should be treated and be reutilized as service or process water.

Complete Separation of Solids from Liquids in one Process Step

The waste solution (suspension) passes through a tubular,, micro porous membrane. At lowest resistance only a partial stream (filtrate) and the substances dissolved therein can pass through the membrane whereas the solids are retained and drained continuously with the main stream.

Periodic Backwashing

To prevent those solids deposits on the suspension side of the membrane, the filtrate is squeezed periodically for a few seconds. This pressure impact rinses the membrane while the filtration capacity is kept constant.

The membrane material, filtering surface, frequency and duration of the backwashing as well as the arrangement of the filtering elements are decisive to achieve an optimum design of the filtration process. Our own labs enable us to perform a lot of pre-tests. A mobile pilot plant that can be adapted to the production process is available at jobsite as well.


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