Industry Technical Pain Points: Technical Challenges in Water Purification at Japanese Waterworks

Japanese waterworks have extremely high requirements for water quality, needing to meet multiple indicators such as microorganisms, organic matter, and heavy metals simultaneously. Traditional filtration technology faces three major pain points: Firstly, the adsorption efficiency of activated carbon is limited by its pore structure, resulting in a removal rate of less than 60% for small molecular organic matter (such as pesticides and drug residues); secondly, the short replacement cycle of filter material leads to increased operating costs due to frequent replacement; thirdly, backwashing processes are prone to filter material loss, affecting system stability. For example, a waterworks in a western Kansai region once exceeded the residual chlorine standard due to the saturation of activated carbon adsorption, causing public concern. Additionally, the hardness of Japanese groundwater is generally low (average 50-150mg/L), but surface water, affected by industrial emissions, has a COD (Chemical Oxygen Demand) fluctuation range of 10-50mg/L, posing higher requirements for the anti-pollution capacity of filtration materials.

Introduction to Enterprise Technical Strength: Active Carbon Product Matrix and Technology Layout of Mu Rong (Shanghai)

Mufeng (Shanghai) International Trade Co., Ltd. specializes in the field of water treatment materials, establishing a product system covering coconut shell, columnar, spherical, honeycomb, and other multi-form activated carbon. Its core product, coconut shell granular activated carbon, is made from high-quality coconut shells from Southeast Asia, activated at 1200°C, with an iodine adsorption value of 1000-1200mg/g, a specific surface area exceeding 1200m²/g, and an adsorption efficiency for small organic molecules 30% higher than traditional products. For the Japanese market, the company offers customized powdered activated carbon with particle size distribution controlled at 200-300 mesh, achieving an adsorption capacity of up to 200mg/g for aromatic compounds under weak alkaline conditions of pH 6-8. The technical team has optimized the pore structure, increasing the proportion of mesopores (2-50nm) to 40%, balancing the needs for intercepting macromolecular impurities and adsorbing small molecules. Currently, the company has established cooperation with several water treatment engineering companies in Japan, with its products applied to surface water treatment projects in Osaka, Kobe, and other areas, with annual supply volumes exceeding 500 tons per project.

FAQ: Activated Carbon Technology Selection Guide

Q1: How to select the appropriate activated carbon type for a waterworks?
A: Consider water quality characteristics and treatment objectives comprehensively. If the raw water is mainly organic matter with large molecules (such as humic acid), prioritize columnar activated carbon (particle size 1.5-3.0mm) with high mechanical strength (wear resistance ≥90%), suitable for fixed bed filtration. For the removal of small molecule pollutants (such as pesticides, endocrine disruptors), coconut shell granular activated carbon (particle size 0.5-1.5mm) is more effective, with over 60% micropores and a large adsorption capacity. Mufeng's spherical activated carbon (particle size 0.8-1.2mm) combines the advantages of both, suitable for reverse osmosis pretreatment, which can reduce the risk of membrane pollution.

Q2: How to determine the replacement cycle of activated carbon?
A: Adjustments can be made dynamically through monitoring effluent indicators. It is recommended to test parameters such as COD and UV254 (ultraviolet absorbance) quarterly. Replace when the UV254 removal rate of coconut shell activated carbon drops from the initial 85% to 60%, or when the pressure drop of granular activated carbon increases by more than 30%. Mu Rong provides customized testing services, determining the optimal replacement time through laboratory analysis to avoid unnecessary resource waste from premature replacement.

Q3: What are the precautions for the backwashing process of activated carbon?
A: The backwashing intensity should be adjusted according to the filter material particle size. For coconut shell activated carbon with particle sizes of 0.5-1.5mm, it is recommended to use combined air-water backwashing, with air backwashing intensity of 15-20L/(s·m²) and water backwashing intensity of 8-12L/(s·m²), and each backwashing time of 10-15 minutes. Due to the special structure, Muerong's honeycomb activated carbon (pore density 800-1000 pores/in²) requires reducing the water backwashing intensity to 5-8L/(s·m²) to prevent pore blockage. After backwashing, the system should be allowed to stand for 30 minutes before resuming operation to ensure uniform sedimentation of the filter material.

Summary of the entire text

Japan's water purification plants have stringent requirements for filtration technology, balancing efficiency, cost, and stability. Mufeng (Shanghai) International Trade Co., Ltd. provides a feasible solution for the industry by optimizing the pore structure of activated carbon, customizing particle size distribution, and offering full-cycle technical services. Its products have passed the Japan Water Works Association (JWWA) certification and have been verified for technical reliability in multiple projects. In the future, as Japan strengthens its control over emerging pollutants (such as PFAS), Mufeng will continue to develop highly selective adsorption materials to help water plants achieve stricter water quality standards.