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SDN Environmental Technology Group.is a professional environmental protection high-tech group enterprise in gas purification,liquid treatment,material separation and concentration.Main business includes consulting,planning and design, intelligent equipment manufacturing,engineering construction,etc.Adhering to the mission of Original Innovation as the main driving force to promote industrial technology upgrading, we committed to providing clean production,energy saving and environmental protection technology solutions and engineering application solutions with membrane and membrane separation technology.
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by the Shanghai Industrial pump permanent investment in the construction ,
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SDN adheres to the mission of source innovation as the main driving force, promoting industrial technology upgrading, and strives to build an independent research and development team.
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project consulting, planning and design, intelligent manufacturing, engineering construction, operation and maintenance services, etc., mainly serving the new energy material industry chain
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350 independent intellectual property rights, nearly 200 authorized patents, more than 10 international PCT patents, and many large central enterprises in the industry, leading listed companies, head enterprises to establish a long-term stable cooperative relationship, and get unanimous praise.
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Quality China Scsdn Environment Technology Co., Ltd. factory
Quality China Scsdn Environment Technology Co., Ltd. factory
Quality China Scsdn Environment Technology Co., Ltd. factory
Quality China Scsdn Environment Technology Co., Ltd. factory
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by the Shanghai Industrial pump permanent investment in the construction ,
Brief Introduction to SDN Filtration & Concentration Machine
2026-09-16
Brief Introduction to SDN Filtration & Concentration Machine
    SDN filtration and concentration equipment targets industry-specific filtration pain points. Supported by two high-performance core filter elements, titanium-based metallic membranes and silicon carbide membranes, combined with precision filtration processes and intelligent control systems, the equipment efficiently performs various filtration and concentration, impurity removal & purification, and material recovery tasks. It fully meets the production demands for refined, continuous and eco-friendly industrial manufacturing.     Filter Element – Titanium-based Metallic Membrane  Manufacturing Process Made from high-purity industrial metal powder via high-pressure compaction and high-temperature sintering. Joints are welded under inert gas protection without any binders.    Material Properties The membrane material is fabricated leveraging the Kirkendall effect induced by elemental interdiffusion. The reactive synthesis technology enables precise control of pore structures at micron/submicron scales. The material features uniform pore size distribution, high filtration accuracy, high open porosity, small tortuosity factor and low filtration resistance. Its unique crystal structure with mixed metallic and covalent bonds combines merits of both metals and ceramics, delivering outstanding chemical stability, thermal stability, mechanical and physical properties, machinability, as well as thermal and electrical conductivity. The material production process is environmentally friendly. The material is eco-friendly throughout its full lifecycle, recyclable and cost-effective. Filtration rating: 0.1 μm    Filter Element – Silicon Carbide Membrane Manufacturing Process Fabricated with high-purity silicon carbide (>99.5%) as raw material through high-pressure compaction and recrystallization sintering at 2400 °C without any sintering additives. It scores 9.5 on the Mohs hardness scale, second only to diamond (Mohs 10).    Material Properties Superior chemical stability: barely reactive with any solvent below 1500 °C. It features extreme oxidation resistance (any concentration), chlorine resistance (any concentration) and fluoride resistance (any concentration), with outstanding tolerance to acid/alkali of any concentration and high temperature resistance up to 800 °C. Extremely high hydrophilicity with a water contact angle close to 0°, resulting in very low filtration pressure drop. High mechanical strength with pressure resistance >10 bar and zero risk of filament breakage. High thermal conductivity and low thermal expansion coefficient. Excellent performance recovery after chemical cleaning. Under heavily contaminated conditions, it can be continuously cleaned with high-concentration chemical agents while permeability can still be restored. Service life: over 20 years. Filtration rating: 0.03 μm   Application Scope of SDN Filtration & Concentration Equipment  Primary Applications - Filtration and concentration of ternary precursors - Filtration and concentration of cobalt carbonate and cobalt hydroxyoxide - Filtration and concentration of sodium-ion battery precursors - Washing and filtration of lithium iron phosphate - Filtration for hydrometallurgy - Filtration and concentration of spherical nickel hydroxide - Filtration and concentration of cobalt hydroxide - Filtration and concentration of other slurries   Leveraging the advantages of titanium-based metallic membranes and silicon carbide membranes, SDN filtration equipment addresses many drawbacks of conventional filtration equipment and adapts to diverse harsh and complex working conditions. With a comprehensive portfolio of complete machines, the equipment is widely applied in lithium battery, hydrometallurgy, metal salt refining and other industries.   Adopting purely physical separation technology without altering material properties, the equipment boasts high filtration accuracy, low pressure drop, easy cleaning, long service life and fully automatic continuous operation.   It provides efficient and stable integrated filtration solutions for industrial production, helping enterprises improve quality & efficiency, save energy & cut costs, and achieve stable and eco-friendly production.
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Water Treatment in the Lithium Battery Industry: From Compliant Discharge to Circular Water Sustainability
2026-08-20
Water Treatment in the Lithium Battery Industry: From Compliant Discharge to Circular Water Sustainability
Against the global backdrop of dual carbon goals and tightening industrial environmental regulations, wastewater treatment is no longer a passive compliance task for the new energy sector — it has become a core link that connects production stability, resource recovery and long-term sustainable operations.For lithium battery material manufacturers, building an efficient water treatment system is not only a requirement for meeting discharge standards, but also a key step to unlock the value of industrial water reuse. Unlike general municipal wastewater, the effluent generated in lithium battery material production contains complex components including heavy metal traces, high-concentration salt and organic additives. If not properly treated, it will not only pose a potential threat to the surrounding water environment, but also lead to unnecessary water resource waste under the background of increasing water scarcity. Modern water treatment solutions no longer rely on a single process, but build a full-cycle system through graded filtration, membrane separation technology and resource recovery units: this design can not only stably make the effluent meet strict discharge standards, but also convert part of the treated water into process water that can be reused in production, helping enterprises reduce their dependence on new water intake. Many factory operators still have misunderstandings about water treatment systems, thinking that "stable discharge" is the end point. In fact, a well-designed system can bring additional operational value in daily operation. For example, reasonable sludge treatment and resource recovery links can recover useful components from wastewater and turn them into recyclable resources; the optimized system layout can also reduce the energy consumption of operation and make the water treatment link itself move in a more energy-saving direction, which is highly consistent with the emission reduction goals pursued by the lithium battery industry. For today's industrial production, environmental protection and production efficiency are no longer opposing options. When the water treatment system is deeply integrated into the factory operation, it can not only help enterprises easily cope with the increasingly strict environmental assessment requirements, but also create a more sustainable production model through water recycling. This is not only a necessary measure for enterprises to fulfill their environmental responsibilities, but also a core support for the new energy industry to move towards a greener and more circular future.
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Key Points of Desilication Technology: Solving 80% of Common Faults in Zero-Liquid-Discharge Water Treatment
2026-07-08
Key Points of Desilication Technology: Solving 80% of Common Faults in Zero-Liquid-Discharge Water Treatment
Silica in water predominantly exists in the form of inorganic silicic acid compounds, and the industry uniformly measures it as silicon dioxide (SiO₂). According to GB/T 12149-2017, Determination of Silicon in Industrial Recirculating Cooling Water and Boiler Water, silica in water exists in four forms: 1. Dissolved Silica (Reactive Silica) Composed mainly of monomeric orthosilicic acid (H₄SiO₄) and metasilicic acid (H₂SiO₃); detectable via the molybdate colorimetric method. Particle size < 1 nm, so it cannot be removed by ordinary filtration; under conditions of pH > 10.5, a small fraction dissociates into silicate ions. 2. Colloidal Silica (Non-Reactive Silica) Formed when silicic acid molecules polymerize into polysilicic acid colloids, with a particle size of 1 nm to 1 μm. Conventional coagulation removes only about 60%, and it can easily pass through ultrafiltration and reverse osmosis membranes. 3. Adsorbed Silica Silica adsorbed onto the surface of sediment, iron hydroxide, or calcium carbonate flocs; most of it can be removed through conventional sedimentation and filtration. 4. Particulate Silica Solid particles such as sand, gravel, and silicate minerals, which can be fully intercepted by bar screens and quartz sand filtration. For zero-liquid-discharge (ZLD) and MVR evaporation systems, dissolved silica and colloidal silica are the most hazardous. As they pass through the membrane system, they are continuously concentrated and their concentrations multiply, making them the core cause of silica scale formation. Core reasons why water treatment must remove silica, and the hazards of silica: 1. Damage to Reverse Osmosis / Nanofiltration Membrane Systems Colloidal silica forms a dense gel layer on the membrane surface, while dissolved silica precipitates as silica scale after continuous concentration. Per HJ 579-2010, Technical Specification for Membrane Separation Wastewater Treatment, the RO feed-water SDI should be ≤ 5. Excessive silica directly keeps the SDI elevated, manifesting as a month-by-month rise in transmembrane pressure, a production capacity decline of over 30%, and premature membrane element failure within 1-2 years. Silica scale cannot be dissolved by conventional acid or alkali cleaning; only hydrofluoric acid can remove it, significantly increasing chemical consumption and on-site safety risks. 2. Fatal Impact on MVR Evaporation-Crystallization Systems Industry standards clearly specify that the silica dioxide in MVR evaporator feed water should not exceed 50 mg/L, while salt-resource-recovery projects must control it within 10 mg/L. Under high-temperature concentration, silicic acid polymerizes to form dense, hard magnesium silicate and calcium silicate scale that firmly adheres to heat-exchanger tube walls. With a thermal conductivity only 1/100 of that of stainless steel, silica scale directly raises evaporation energy consumption by 40%. Being extremely hard, it is difficult to remove by ordinary acid washing and requires shutdown for high-pressure water flushing; each such maintenance stop can take 3-7 days. Once pipelines are blocked by silica scale, system treatment capacity drops sharply, and there is also an environmental risk of non-compliant effluent discharge. 3. Secondary Cascading Economic Losses Silica entering the crystallized salt product turns the salt black and fails quality standards, making it unsellable as industrial salt and forcing disposal as hazardous waste — at up to 10 times the cost. Meanwhile, frequent start-stop cycles and repeated chemical cleaning generate large volumes of hazardous sludge, and combined with chemical consumables, labor hours, and production downtime, overall operation and maintenance costs multiply. Silica scale has three major characteristics — difficulty of cleaning, irreversible damage, and heavy equipment wear — and is a key hidden threat to the stable operation of membrane concentration and evaporation-crystallization systems. All industry design codes make it clear that desilication cannot be remedied or repaired by downstream equipment; it must be a core part of pretreatment, with strict control over key process parameters such as pH, chemical dosage, and reaction retention time. Based on the actual water quality of the project and the resource-recovery objectives, the appropriate processes — such as magnesium-salt precipitation, tubular membrane, and resin polishing for silica removal — should be selected to control feed-water silica dioxide within the standard limits. Only in this way can the comprehensive costs arising from equipment failures, shutdown maintenance, and hazardous-waste disposal be effectively reduced, ensuring long-term stable and compliant operation of the entire water treatment system.
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Tel: 86-189-8175-1540 Tel: 86-189-8175-1540 Fax: 86-28-6174-7978 Fax: 86-28-6174-7978 Mobile Phone: +86 189-8175-1540 Mobile Phone: +86 189-8175-1540 E-mail: sdneptech@gmail.com 301, Building 11, Guoteng Technology Park, No.3 Xixin Avenue, Hi-Tech West District, Chengdu, China 301, Building 11, Guoteng Technology Park, No.3 Xixin Avenue, Hi-Tech West District, Chengdu, China

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