Industrial water treatment in steel manufacturing demands precision, reliability, and compliance with increasingly strict environmental regulations. This case study details how Wuxi Yaotong Environmental Protection Equipment Co., Ltd. designed and delivered a turnkey cold rolling circulating water and sewage treatment solution for one of Indonesia’s largest steel enterprises.
Project Background
Cold rolling processes in steel mills generate large volumes of wastewater containing suspended solids, oils, and heavy metals. Left untreated, this effluent poses serious risks to local waterways and violates Indonesian environmental discharge regulations. The client required a robust, low-maintenance system capable of treating high-volume flows continuously without interrupting production.
Solution Design
After a thorough site survey and water quality analysis, Yaotong’s engineering team proposed a multi-stage treatment process:
- Self-Cleaning Filter (Automatic Backwash): Removes large suspended particles continuously without manual intervention, protecting downstream equipment and reducing maintenance costs.
- Dissolved Air Flotation (DAF) Unit: Efficiently removes oils, emulsified grease, and fine suspended solids through micro-bubble flotation technology.
- Chemical Dosing System: Automated coagulation, flocculation, and pH adjustment ensure treated water consistently meets discharge standards.
- Sludge Dewatering Unit: Reduces waste volume and facilitates compliant sludge disposal on-site.
- Recirculation Loop: Treated water is returned to the cooling circuit, cutting fresh water consumption by over 60%.
On-Site Construction & Commissioning
Yaotong’s experienced installation team was deployed to the Indonesian facility for on-site construction. Working alongside local contractors, the team completed civil works, equipment installation, piping, electrical integration, and PLC control system commissioning within the contracted schedule. Special attention was paid to tropical climate conditions, selecting corrosion-resistant materials throughout.
Results Achieved
- Effluent quality meets Indonesian MENLH Regulation No. 5/2014 discharge limits
- Circulating water reuse rate increased to over 95%
- System operates 24/7 with automated controls requiring minimal operator intervention
- Chemical consumption reduced through real-time dosing optimization
Why Yaotong for Industrial Water Treatment?
Founded in 2007, Wuxi Yaotong Environmental Protection Equipment Co., Ltd. has delivered water treatment systems across Southeast Asia, Africa, and the Middle East. Our in-house engineering team handles everything from process design to manufacturing, installation, and after-sales support — ensuring consistent quality and accountability throughout every project.
Whether you need a complete turnkey water treatment plant or individual components such as self-cleaning filters, FRP cooling towers, or DAF units, Yaotong has the expertise to deliver. Contact us to discuss your project requirements.
