Zero Liquid Discharge (ZLD) Project at the Shi ** Su Coal Mine in Ordos
I. Project Overview
Dedicated to the zero liquid discharge (ZLD) objective of the Shi ** Su Coal Mine in Ordos, this project implements a multi-stage water treatment system for the advanced treatment and reuse of mine water and concentrated brines from various stages. Through precise management of operational parameters in each section, it achieves highly efficient water resource recycling, thereby facilitating the mine's green and low-carbon development. The specific process flow is detailed in the corresponding diagram.
II. Treatment Process
III. Summary
1. Stable and Reliable Salt Rejection Rate
Haina membrane elements demonstrate excellent salt rejection performance across various treatment stages. In the primary reverse osmosis and secondary concentration stages, the salt rejection rate remains consistently around 99%. Even in the tertiary and quaternary concentration stages, the salt rejection rate is maintained at approximately 98.5%. This consistently high performance ensures reliable effluent quality, meeting the stringent water quality requirements for the coal mine’s zero-liquid discharge objectives. It provides a solid foundation for water reuse and compliant discharge.
2. Adaptability to Diverse Operating Conditions
The system handles a wide range of feed water sources, including mine water, primary concentrated brine, secondary concentrated brine, and tertiary concentrated brine. It also accommodates significant variations in daily treatment capacity—from 21,600 m³ (primary reverse osmosis) down to 432 m³ (quaternary concentration). Differences in membrane rack arrangements and membrane element types further contribute to operational complexity. Under such diverse and challenging conditions, Haina membranes continue to operate stably, demonstrating strong compatibility and adaptability. This ensures the continuous and efficient operation of the multi-stage concentration system, enhances the coal mine’s water resource recovery rate, reduces wastewater discharge, minimizes environmental impact, and supports the achievement of closed-loop water management in the zero-liquid discharge project.
