Coal Slurry Water Recycling and Treatment Solution | Energy-Saving and Emission-Reduction Plan

Release time:

2026-04-13

A single skid-mounted system can turn coal slurry water from a waste stream into a valuable resource while achieving near-zero discharge. Key benefits include: energy and resource savings of over 80%, operational and maintenance cost reductions of more than 60%, and space savings of over 50%. Let us help you transform coal slurry water from a cost burden into a green asset that drives water conservation and operational efficiency. Contact us today for a customized technical solution!

“3-Free Direct Filtration” Technology for Coal Slurry Water Recycling and Treatment Solutions in Thermal Power Plants

I. Core Issue: Challenges in Conventional Coal Slurry Water Treatment

The coal slurry water in thermal power plants mainly originates from flushing of the coal-handling system, dust removal, and rainwater, and its characteristics are:

·High suspended solids (SS) concentration, primarily consisting of extremely fine coal dust particles.

·Particulate matter is lightweight and has poor settling characteristics.

·Water quality and quantity fluctuate significantly, influenced by factors such as power generation load and weather.

·The conventional “coagulation–sedimentation” process requires a large footprint, necessitates frequent sludge removal from the sedimentation tanks, involves high chemical dosages, and struggles to consistently produce effluent of sufficient quality for reuse in high-standard applications.

II. Solution: Coagulation + Integrated “3-Free Direct Filtration” System

This scheme will serve as a pretreatment stage, integrated with an innovative “3-Free direct filtration” advanced treatment unit, to form a compact, skid-mounted reuse treatment system that is both highly efficient and energy-saving.

Process flow:

Coal slurry wastewater → Grit chamber/Equalization basin (for homogenization and flow regulation) → Coagulation reaction tank (with a small dose of flocculant added) → Core “3-Free Direct Filtration” unit → Recycled water storage tank

III. Core Advantages of the “3-Free Direct Filtration” Technology in Coal Slurry Water Treatment

1. Power-free water production: significant energy and resource savings

·By leveraging the inherent potential energy of the plant’s coal-water system or the residual pressure in the pipelines, the water flow can pass through the direct filtration unit without the need for an additional booster pump, enabling gravity-fed or low-pressure filtration. For coal slurry with large treatment volumes, this approach can result in substantial energy savings.

2. No consumable replacements: Eliminates solid waste and reduces O&M costs.

·The core filtration medium employs specially designed permanent or semi-permanent filter columns, rather than traditional cloth bags, filter bags, or filter cartridges.

·Efficient air–water combined backwashing technology thoroughly removes trapped coal-powder particles, restoring the filter column’s filtration capacity. The high-concentration coal-slurry water discharged during backwashing can be returned to the front end of the system or directed to the coal yard, enabling the recovery and reuse of coal powder and eliminating the generation of waste consumables.

3. Non-discriminatory influent: strong resistance to shock loads and stable effluent quality.

·This technology is insensitive to fluctuations in influent water quality (such as changes in SS concentration) and does not require frequent process adjustments in response to variations in the incoming water.

·The microflocs formed during the enhanced chemical coagulation process are precisely retained in the direct filtration unit, ensuring that the effluent SS remains below 5 mg/L—even under conditions of fluctuating influent SS—and can even be lower, fully meeting or exceeding the quality standards for reclaimed water.

IV. Core Value Brought to Thermal Power Plants

·Significant economic benefits:

·Energy-saving: No-power water production, resulting in extremely low operating costs.

·Drug savings: Compared with conventional processes, the dosage of flocculant can be reduced by approximately 15–30%.

·Space-saving: The skid-mounted, integrated design occupies only 1/3 to 1/2 the footprint of conventional sedimentation tanks, making it particularly well-suited for plant expansion and renovation projects.

·Resource recovery: The recovered coal powder can be reused, and the backwash water is recirculated in a closed loop, achieving dual recovery of both water and coal resources.

·Environmental and Social Benefits:

·Zero Waste Emissions: By adopting “consumable-free” operations and “coal sludge recycling,” solid waste emissions are minimized to the greatest extent, thereby supporting power plants in achieving “zero emissions” and clean production goals.

·Water conservation and emission reduction: Achieve high-quality reuse of coal slurry water, significantly reducing fresh water intake and wastewater discharge.

· Intelligent O&M: The system operates fully automatically, requiring minimal human intervention, making O&M simple and reliable.

Summary

Applying the “3-Free direct filtration technology” to coal slurry water treatment in thermal power plants represents a revolutionary upgrade over conventional water-treatment practices. Centered on the core principle of “replacing sedimentation with filtration,” this approach employs a highly integrated, energy-efficient, and maintenance-free skid-mounted system to consistently produce high-quality recycled water while minimizing operating costs and environmental impact. As such, it is the ideal solution for thermal power plants seeking to conserve water, reduce energy consumption, enhance quality and efficiency, and achieve green development.

None