Complete plant for the treatment of exhausted pickling
A closed loop for a more sustainable galvanic industry.
Complete plant for the treatment of a spent chloride-based pickling
Customer
The client is a major galvanic company located on the island of Réunion, in the Indian Ocean.
Objectives
Reduce the costs of disposal of spent acid, Reduce the environmental impact of the production process, Reuse the distillate produced as part of the treatment process.
01.
Opportunity
The need to treat the spent hydrochloric acid produced by the galvanic line to avoid the high transportation costs for sending it to the mainland.
02.
Project
Problem analysis with the vacuum evaporation test of spent acid conducted at the C&G laboratory.
Design of a treatment plant including the necessary pre-treatment, a filter press and the application of the vacuum evaporator model ES – DRY 250.
03.
Solution
To solve the problem of disposal of used acid and reduce transportation costs, a treatment plant based on a vacuum evaporator model ES – DRY 250 was designed and installed, combined with a liquid pre-treatment, including a filter press.
Total volume of wastewater:
80,000 liters/year
The total volume of liquid after the Treatment
64,000 liters/year
The total volume of concentrate produced
21,500 kg/year
Analysis of the results
The installation of the vacuum evaporator model ES – DRY 250 has led to a more efficient and sustainable management of pickling wastewater. The plant has allowed to treat 80,000 liters/year of wastewater, reducing the volume to be disposed of and optimizing the entire process. The liquid was separated by filter press, obtaining 64,000 liters/year of treated liquid ready for evaporation.
The production of 64,000 litres/year of distillate allowed its reuse in the production cycle, with a consequent reduction in water consumption.
The plant also produced 21,500 kg/year of concentrate, mainly composed of sodium chloride and sodium sulphate, with traces of zinc and calcium, potentially reusable materials. An additional benefit was the complete elimination of the need to transport the spent acid on land, reducing costs and environmental impact. Finally, the by-products obtained from the process, such as iron hydroxide and sodium salts, can be recovered and reused in other industrial processes.
Thanks to these results, the company has obtained a more sustainable and economically advantageous process, transforming a disposal problem into an opportunity for recovery and reuse.
Savings
Reduction of management costs
Circularity
Reuse of Raw Materials
Sustainability
Reducing environmental impact