We have already addressed on other occasions the importance of access to safe drinking water around the world. Not only is it essential for human life and health, but it also plays a crucial role in the social and economic development of communities. Among the most promising solutions, water purification by electrolysis is gaining ground as an innovative approach to ensure access to clean and safe water.
Traditionally, various chemical and physical methods have been used to remove contaminants and microorganisms from water. However, in recent years, electrolysis has emerged as a more efficient, cost-effective, and even sustainable alternative in certain contexts for generating by-products used in water disinfection and purification for human consumption.
But how is electrolysis applied to water purification? Brine electrolysis is an electrochemical process in which a solution of sodium chloride (NaCl) and water is broken down into chlorine (Cl₂), hydrogen (H₂), and sodium hydroxide (NaOH). The chlorine is then absorbed by the caustic soda, producing sodium hypochlorite—a compound widely used for making water safe to drink due to its powerful fungicidal and bactericidal properties.
How Does Water Purification by Electrolysis Work in Practice?
Water purification by electrolysis is a cutting-edge method that uses electrical energy to disinfect water, breaking down contaminants and generating powerful oxidizing agents like active chlorine directly from water containing dissolved salts. This process is not only effective but also eliminates the need for external chemical additives.
At its core, electrolysis involves passing an electric current through water that contains ions (typically from sodium chloride). This current initiates electrochemical reactions at the electrodes, producing disinfectants like sodium hypochlorite (NaOCl), which neutralize pathogens including bacteria, viruses, and protozoa.
This technology is particularly relevant for decentralized and off-grid applications. Unlike traditional methods that rely on the transport and storage of hazardous chemicals, electrolysis enables on-site production of disinfectants, offering a reliable, scalable, and safe approach to ensuring access to clean water.
Advantages of electrolysis applied to water purification
One of the main advantages of water purification by electrolysis is that the necessary disinfectant—sodium hypochlorite—can be generated locally. A common drawback of traditional chemicals lies in their transportation and handling risks. Although sodium hypochlorite is also classified as a hazardous substance, modular electrolysis plants allow for its on-site production. This enables reliable supply to rural or hard-to-reach areas while significantly reducing transportation needs and the associated carbon footprint.
These electrolysis plants can adjust their production capacity based on current and future needs, ranging from 2–4 tons of chlorine per day to 10–20 tons. This flexibility makes them suitable for diverse scenarios, whether it’s supplying drinking water to small rural communities or meeting the higher demands of urban or industrial areas.
Another major benefit of chlorine generation through electrolysis is its compatibility with renewable energy sources such as solar or wind power. This makes water purification by electrolysis not only energy-efficient but also a sustainable solution, contributing to the reduction of greenhouse gas emissions.
Electrolysis enables a local, flexible, and reliable supply of sodium hypochlorite. It’s no surprise that more and more countries are investing in this technology by installing electrolysis plants in areas with a pressing need for safe drinking water.
Conventional water disinfection techniques—such as chlorination, UV treatment, and ozonation—each have their limitations:
- Chlorination requires handling and transporting hazardous chemicals, posing safety and logistical challenges.
- UV light is effective only in clear water and offers no residual protection.
- Ozone systems are complex, expensive, and energy-intensive.
Electrolysis overcomes these barriers by generating disinfectants like sodium hypochlorite on-site, from water and salt. This makes it especially valuable in remote or underserved areas where chemical supply chains are unreliable or unsafe.
The Science Behind Electrochemical Disinfection: How Active Chlorine Is Generated
Thanks to the comprehensive research conducted by Riga Technical University, we now have a scientific baseline that confirms the efficacy of electrolysis in water disinfection. Their study shows that using 0.5 A for 15 minutes is sufficient to eliminate E. coli in tap water with low chloride concentration, producing enough active chlorine to ensure microbiological safety.
One of the critical findings was the importance of recirculation in the system. This process helps distribute the generated disinfectant uniformly and increases its concentration, enhancing effectiveness.
Additionally, tests involving up to 24 different electrode configurations revealed that optimized setups could dramatically improve performance, opening the door for modular and adaptable solutions.
Welysis incorporates these principles in its modular electrolyzers, ensuring not only efficiency but also replicability across different environments and water conditions.
Welysis Modular Electrolyzers: Scalable, Efficient, and Ready for Deployment
At Welysis, we specialize in the design, installation, and servicing of modular electrolysis plants. These units are tailored to generate essential chemicals such as sodium hypochlorite, sodium hydroxide, hydrochloric acid, and hydrogen, while also purifying water for safe human use.
Our electrolyzers are:
- Modular and scalable, allowing clients to expand production capacity as needed.
- Energy-efficient, leveraging the latest membrane technologies to minimize electricity consumption.
- Plug-and-play, with rapid installation directly at the client’s site.
Each unit integrates seamlessly with our Welysis International Network (WIN)—a global web of interconnected plants sharing data, best practices, and real-time insights to optimize operations continuously.
Our offering is not limited to hardware. We deliver a full-service package:
- Custom design and engineering
- On-site assembly and commissioning
- Preventive and predictive maintenance
This 360º approach guarantees the highest quality, reliability, and ROI for our partners.
WELYSIS ELECTROLYSIS SOLUTIONS
Who Benefits Most from Local Electrolytic Water Purification?
Electrolysis-based water purification is a game-changer for various stakeholders, including:
- Salt producers: Looking to diversify their business by producing chlorine locally.
- Chemical distributors: Seeking vertical integration to reduce dependency on imports.
- Industrial players (e.g., Oil & Gas): Wanting to self-produce chlorine and caustic soda, cutting procurement costs and adding new revenue streams.
- Public water utilities: Aiming for safer, localized disinfectant production.
- Investors: Attracted by the profitability, ESG alignment, and potential tax benefits of local production.
- Government-backed projects: In regions where safe water access is a public health priority.
In all cases, our clients value Welysis’ commitment to sustainability, technical excellence, and the trusted partnership enabled by our WIN support ecosystem.
Real-World Applications: From Rural Communities to Industrial Giants
Welysis technology is already demonstrating its impact across a wide range of real-world applications:
- Remote communities: Where logistics make chemical delivery costly or impractical, our systems allow for independent water disinfection and chlorine production.
- Islands or off-grid zones: As in the case of Biomca in the Canary Islands, local production ensures security of supply and price stability.
- Industrial sites: Large factories benefit from on-site production, both for internal use and external sales, improving margins and resilience.
- Sustainability-driven projects: Where carbon footprint is scrutinized, eliminating transport emissions and localizing production offers a decisive advantage.
With these solutions, Welysis is not just solving technical problems; we are empowering regions, industries, and communities to take control of their water safety and chemical supply.
Frequently Asked Questions About Electrolysis-Based Water Treatment
Q: Is electrolysis safe for producing drinking water?
Absolutely. The process generates disinfectants in controlled concentrations and eliminates harmful pathogens effectively, as confirmed by peer-reviewed research.
Q: Does it require chemical additives?
Only minimal salt (usually sodium chloride) is needed. No hazardous chemical handling or storage is required.
Q: How much maintenance do these systems need?
Welysis systems are low-maintenance and come with remote monitoring through WIN, plus optional predictive maintenance packages.
Q: What’s the power requirement?
Our plants are optimized for energy efficiency, and can be powered by renewables (solar, wind) for off-grid applications.
Get Started: How to Implement Electrolysis Water Purification in Your Operation
Whether you’re a producer, distributor, industrial player, or public sector operator, Welysis offers a clear pathway to implementing electrolysis water purification:
- Consult with our engineers to assess your needs and infrastructure.
- Design a custom solution with modular electrolyzers scaled to your demand.
- Receive full-service deployment, from shipping and setup to ongoing support.
- Join WIN, and benefit from continuous innovation, support, and optimization.
💬 Contact us today to request a quote, technical consultation, or more information. Let’s make clean water and sustainable chemical production a reality—locally and reliably.
