The modular electrocoagulation plant Celdar is a patented system used for the treatment of industrial wastewaters, process flow streams, and water purification. This modular system can be adapted for electrocoagulation, electrooxidation, electrofenton, electrothickening, or a hybrid version combining several of the functions. Different electrodes, including alloy electrodes, can be used in the system, and it is compatible with existing treatment systems like RO and requires a small installation footprint. This system is applicable in electronic and semiconductor industries, lithium-ion battery production and recycling, galvanizing and painting industries, textile and dyeing industries, soil remediation process, petrochemical industries, food and healthcare products industries among many others.