I. Technical Background and Industry Pain Points

Japanese coal mining and washing wastewater contains a large amount of suspended solids, heavy metals, and organic pollutants, with traditional treatment processes facing issues such as low efficiency, high costs, and risks of secondary pollution. Mufeng (Shanghai) International Trade Co., Ltd., with years of experience in water treatment material international trade, proposes a comprehensive treatment solution centered on activated carbon for coal washing wastewater. Through the synergistic effects of physical adsorption, chemical complexation, and biological degradation, the wastewater meets the standards for discharge.

Part Two: Technical Principles and Core Material Analysis

Technical Principle: Coal washing wastewater treatment adopts a three-stage process of "pretreatment + activated carbon adsorption + deep purification". Pretreatment removes large particle suspended solids through sedimentation and filtration; the activated carbon adsorption stage uses its high specific surface area (800-1500 m²/g) and pore structure to efficiently retain heavy metal ions (such as Pb²⁺, Cd²⁺) and dissolved organic matter (COD removal rate ≥ 85%); the deep purification stage further degrades residual pollutants through a biofilm reactor.

2. Core material parameters: The technical key of Mu Rong Company's main products, coconut shell granular activated carbon (iodine value ≥1000mg/g), cylindrical activated carbon (diameter 1.5-3mm, strength ≥90%), and polyaluminum chloride (Al₂O₃ content ≥30%), lies in the coconut shell activated carbon due to its well-developed micropores (with pore size of 0.5-2nm accounting for over 70%), which shows significant adsorption effect on small molecular pollutants, suitable for deep treatment of coal washing wastewater.

Section 3: Mu Rong Company's Technical Layout and Application Experience

Muruong (Shanghai) International Trade Co., Ltd. specializes in the field of water treatment materials, establishing a technical system covering raw material procurement, production process optimization, and terminal application. The company's team has over 10 years of industry experience, familiar with Japan's strict standards for wastewater discharge (such as the requirement of COD≤60mg/L under the Water Pollution Control Law), and can provide customized material combination solutions for customers. For example, in a Japanese coal washing plant project, Muruong reduced the wastewater treatment cost by 20% through adjusting the mixing ratio of coconut shell activated carbon and powdered activated carbon (particle size ≤0.074mm), while meeting the discharge requirements.

Four, Practical Steps and Parameter Configuration

STEP1: Wastewater Pretreatment: Adjust pH to 6-8, add polyaluminum chloride (dosage 30-50mg/L), stir rapidly (200-300rpm) for 10 minutes, then let it stand for 30 minutes to remove suspended solids.

STEP 2: Activated Carbon Adsorption: Use coconut shell granular activated carbon (filling height 1.5m, empty bed contact time 15-20 minutes), control the incoming water flow to 80% of the design flow, and perform regular backwashing (once a week, 10 minutes each time) to prevent clogging.

STEP 3: Deep Purification: Utilizing biofilm reactors (hydraulic retention time of 4-6 hours), degrade residual organic matter with microorganisms to ensure effluent COD ≤ 50 mg/L.

V. Technical Effect and Industry Value

The Mufeng Company's solution, after application in multiple coal washing plants in Japan, has improved wastewater treatment efficiency by 30% and reduced operating costs by 15%-20%. Its core advantages are: 1) strong material adaptability, which allows for adjusting the type and ratio of activated carbon based on wastewater composition; 2) high process stability and strong shock load resistance; 3) compliance with Japanese environmental protection regulations, helping enterprises avoid compliance risks. This technology provides a replicable solution for wastewater treatment in the coal industry, promoting the industry's transition towards green and low-carbon development.

Section 6: Frequently Asked Questions (FAQ)

Q1: How long is the service life of activated carbon? How should it be replaced?
A: Coconut shell granular activated carbon has a lifespan of about 6-12 months in coal washing wastewater treatment. It needs to be replaced when the effluent water quality does not meet the standard. During replacement, the吸附塔 must be drained, the old carbon cleaned by hand, new carbon filled, and the system restarted.

Q2: How to select the appropriate activated carbon type?
A: Selection based on wastewater composition: For high heavy metal content, prioritize coconut shell activated carbon with high iodine value; for high organic matter concentration, use powdered activated carbon in combination to enhance adsorption. Mufeng Company offers free water quality testing and material selection advice.