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Coal Engineering ›› 2026, Vol. 58 ›› Issue (5): 35-41.doi: 10.11799/ce202605005

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Application of micro-media precipitation coupled with ceramic membranes in the recycling system of high-turbidity micro-polluted wastewater #br#

  

  • Received:2025-10-15 Revised:2025-12-02 Online:2026-05-15 Published:2026-05-27

Abstract:

Under the "Dual Carbon" goals, the thermal power and coal storage/distribution industries face stringent policy requirements and technical challenges in achieving near-zero discharge and recycling of high-turbidity micro-polluted wastewater. Focusing on an integrated coal storage and power generation project in Jiangxi, this study addresses the limitations of existing systems—such as inadequate treatment efficiency, insufficient non-point source pollution control, and limited capability for graded water reuse—by proposing and implementing an innovative treatment train combining micro-media precipitation with ceramic membrane filtration. The process leverages the "flocculation nucleus enhancement" effect of micro-media to accelerate colloidal destabilization and floc growth, coupled with cross-flow ceramic membrane filtration for precise removal of micro-pollutants. This establishes a synergistic system capable of "rapid coarse-particle separation and precise micro-pollutant control". Operational results demonstrate that the effluent quality consistently surpasses the standards specified in The Reuse of Urban Recycling Water—Water Quality Standards for Industrial Uses(GB/T 19923-2024): suspended solids (SS) remain below 6 mg/L, turbidity under 3 NTU, and chemical oxygen demand (COD) below 15 mg/L. The system achieves SS and turbidity removal rates exceeding 99% and 100% compliance, respectively, along with 79% COD removal. Ammonia nitrogen and total phosphorus are reduced by approximately 30% and 96%, respectively. With a daily treatment capacity reaching 91% of the design value, the ceramic membranes maintain an average flux of 72 LMH, and the backwash interval is extended to 5–6 hours. This integrated process realizes near-zero liquid discharge and high-efficiency recycling of high-turbidity wastewater, reducing freshwater consumption by approximately 600 m3/day. The direct operating cost is estimated at ¥1.04 per cubic meter of water treated, and projected annual savings in water costs amount to approximately ¥736,000 after full-capacity operation. The study provides a technically robust and economically feasible paradigm for wastewater resource recovery in the coal industry, demonstrating significant environmental and economic benefits.

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