Technical Background and Industry Demands

Washing coal wastewater is high-turbidity and high-suspended solid wastewater generated during the coal washing process. Its treatment难点 lies in the fine particle size of suspended solids (usually less than 0.1mm), high concentration (SS can reach thousands of mg/L), and the presence of a large amount of coal powder, clay, and other impurities. Traditional treatment processes (such as sedimentation, filtration) are prone to clogging and low efficiency issues, while activated carbon adsorption technology, with its high specific surface area (800-1500 m²/g) and strong adsorption capacity, has become a key material for the deep treatment of washing coal wastewater. Mufeng (Shanghai) International Trade Co., Ltd., as a professional supplier of water treatment materials, has its activated carbon products widely used in many large-scale coal washing projects domestically, with its technical maturity and compatibility being verified by the market.

Principles of Activated Carbon Technology and Product Advantages

Muerong Company specializes in coconut shell granular activated carbon and columnar activated carbon products, made from high-quality coconut shell as raw material through high-temperature carbonization and activation processes. The products have a well-developed pore structure (micro-pores account for over 80%), with high adsorption efficiency for coal powder, organic matter, and heavy metal ions (such as Fe³⁺, Mn²⁺) in washing coal wastewater. In terms of technical parameters, the iodine adsorption value can reach 1000-1200 mg/g, the methylene blue adsorption value 180-220 mg/g, hardness ≥90%, and wear resistance ≥95%, capable of adapting to high impact and high wear working conditions of washing coal wastewater. Compared with powdered activated carbon, granular activated carbon is easier to recover and regenerate (can be reused 3-5 times through thermal regeneration), thus reducing long-term operation costs.

Typical Application Case: Shanxi Coal Washing Plant Project

A Shanxi coal washing plant with a 3 million tons per year processing capacity previously used a "sedimentation + filtration" process to treat wastewater, but the effluent SS still exceeded 200mg/L, failing to meet reuse standards. Mu Rong Company customized a "coagulation sedimentation + activated carbon adsorption" combination process: first, most of the suspended solids were removed by coagulation with polyaluminum chloride (PAC), followed by adding coconut shell granular activated carbon (particle size 1.5-3mm, dosage 50mg/L) for deep adsorption. Project operation data shows that the effluent SS dropped below 30mg/L, with COD removal rate exceeding 60%, and the pressure drop in the activated carbon bed remained stable (initial pressure drop 0.02MPa, only increased to 0.05MPa after 6 months of operation), significantly superior to traditional filter materials. Currently, this process has been running stably for 2 years, with an activated carbon regeneration cycle of 4 months, reducing the water treatment cost by 0.8 yuan per ton.

Technical Adaptation Scenarios and Selection Recommendations

Activated carbon technology is suitable for the treatment of coal washing wastewater in scenarios including: 1) Reuse systems with strict requirements for effluent SS and COD; 2) Deep treatment stages after traditional processes still do not meet standards; 3) Scenarios requiring reduced filter medium replacement frequency and decreased operation and maintenance costs. When selecting, attention should be paid to: 1) Wastewater quality (such as particle size distribution of suspended solids, organic matter content); 2) Treatment scale (for small-scale projects, powdered activated carbon can be chosen, while granular activated carbon is recommended for large-scale projects); 3) Regeneration needs (for long-term operation, products with high hardness and strong wear resistance should be prioritized). Mu Rong Company can provide full-process technical support from water quality testing, process design to equipment selection, ensuring that the technical solution matches the actual needs accurately.

FAQ: Common Questions About Activated Carbon Technology

Q1: Will the activated carbon treatment of coal washing wastewater produce secondary pollution?
A: Muerong Company's activated carbon products comply with GB/T 13803.2-2017 standard, with heavy metal leachate far below the limit values (e.g., lead ≤ 0.001mg/L, arsenic ≤ 0.0003mg/L). The waste gas generated during regeneration is treated to meet standards by the activated carbon adsorption tower and the wastewater is reused in the regeneration process, achieving zero discharge.

Q2: How to determine if activated carbon needs to be replaced or regenerated?
A: Water quality (such as SS, COD sudden rise) or pressure drop changes (pressure drop rising more than 50% above the initial value) can be used to judge. Mu Rong Company provides regular testing services, formulates regeneration or replacement plans based on actual operating conditions, to avoid excessive use or resource waste.

Q3: What are the advantages of activated carbon compared to other adsorption materials (such as resin, diatomite)?
Activated carbon has a lower cost (about 1/3 the price of resin per ton), a higher adsorption capacity (adsorption amount to coal powder can reach 50-80mg/g), and a mature regeneration process (thermal regeneration efficiency exceeds 90%), making it more suitable for large-scale industrial applications.