Closed-Loop Compact Membrane Anode (CMA) System
Main Circular Economy Strategy
Waste Stream
Company
KEYWORDS
Summary
Atotech CZ (Jablonec nad Nisou) developed a closed-loop electroplating system using Compact Membrane Anode (CMA) technology, enabling real-time recycling of chemicals, metals, and rinse water. This modular solution significantly reduces waste and emissions while extending bath life in Zn-Ni plating processes.
Description
Atotech CZ, based in Jablonec nad Nisou (Czech Republic), is part of the global Atotech group—now integrated into MKS Instruments—specializing in advanced surface finishing technologies. The site combines manufacturing and R&D capabilities, focusing on electroplating systems used in automotive, electronics, and heavy industry sectors. With a workforce of over 4,000 worldwide, Atotech is known for pioneering high-performance, resource-efficient coating solutions. Atotech CZ has been instrumental in developing circular systems to reduce the environmental impact of metal plating processes, especially zinc-nickel (Zn-Ni) coating. Atotech CZ developed and implemented a closed-loop chemical recovery and water reuse system for electroplating, centered around Compact Membrane Anode (CMA) technology. This system recycles plating chemicals, metals, and rinse water in real time, virtually eliminating waste and emissions: Membrane Anode Technology: The CMA prevents common by-products (e.g., carbonates, hydroxides) from entering the plating bath, maintaining optimal chemical balance and extending the bath’s lifespan. It achieves this by separating anodic reactions behind a selective membrane, allowing precise control of electrochemical parameters. Vacuum Evaporation and Crystallization Units: The system continuously extracts a small stream of electrolyte, distills pure water via vacuum evaporation (returned to rinse stations), and recovers concentrated chemicals (returned to the plating bath). A freeze unit removes contaminants like carbonates by crystallization, further purifying the bath. Closed-Loop Rinse Water Reuse: Deionized water from the evaporator is reused in rinse cascades, forming a completely circular plating line. Chemical drag-out from rinsing is recovered, closing the water and chemical loop. Modular Integration: Designed to retrofit existing alkaline Zn-Ni plating lines or fit into new systems, the CMA unit is modular and flexible, enabling broad adoption without disruptive overhauls. This circular approach drastically reduces the volume of fresh methanol required, as well as the generation of hazardous solvent waste. The system achieves a solvent recovery rate of approximately 90–95%, enabling the company to continuously reuse methanol with minimal losses. The result is a self-contained solvent loop that reduces the environmental footprint of electronic component production while also cutting operating costs.
Environmental Perspective
Atotech CZ’s closed-loop plating system delivers significant environmental benefits: Wastewater Elimination: The system achieves over 90% reduction in plating wastewater and solid waste (e.g., sludge), approaching zero liquid discharge. Minimal residual waste is highly concentrated and more manageable. Chemical and Metal Circularity: Zinc, nickel, and organic additives are continuously recovered and reused, minimizing virgin material inputs and chemical disposal. Water Conservation: Rinse water is regenerated and reused, dramatically cutting water consumption. Only small losses from evaporation or drag-out require replenishment. Carbon Footprint Reduction: The CMA improves plating efficiency, leading to a 32% reduction in energy use. This, combined with reduced end-of-pipe treatment, significantly lowers the process's carbon emissions. Regulatory Compliance: The system aligns with EU directives on integrated pollution prevention (IPPC) and future circularity goals in industrial chemistry.
Economic Perspective
This circular solution offers Atotech CZ and its customers clear economic advantages: Operational Savings By eliminating frequent bath replacement, reducing chemical replenishment, and slashing water usage, plating operations realize significant cost reductions. Productivity Gains Bath life is extended indefinitely, minimizing production interruptions. Consistent bath chemistry also improves coating quality and reduces scrap. Investment Efficiency Despite requiring advanced equipment, the CMA system was designed for energy and cost efficiency. TÜV Rheinland certification verified improved current efficiency (65–80%) and operational gains. Market Differentiation The CMA system provides Atotech with a competitive advantage, appealing to clients seeking sustainable plating solutions. It enhances Atotech’s value proposition and strengthens customer retention.
