QILEE's Customized Membrane Element

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Project Info


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● Year: 2024
● Sector: Industrial Park Water Reuse & Resource Recovery
● Key Objects: Replace imported reverse osmosis membranes with high-performance domestic alternatives while maintaining strict output quality and capacity standards, achieving significant cost savings and operational efficiency improvements.





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In 2024, our team successfully executed a critical reverse osmosis membrane replacement project for a concentrated water treatment system serving an industrial reclaimed water reuse facility. This initiative represented a significant advancement in sustainable water management for industrial park operations, where efficient water reuse is paramount to both economic and environmental objectives.





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连云港浓水RO装置2024 -1 (2)










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Solution Design


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We implemented a new generation of high-performance, fouling-resistant RO membrane elements, specifically engineered to address the unique challenges of concentrated water treatment in industrial wastewater reuse applications.


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Critical Issues Resolved


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Critical Issues ResolvedSuccessfully resolved severe membrane fouling and excessively high operating pressure observed in previous imported membrane systems.
The domestic membrane solution not only maintained consistent water quality standards but also significantly improved overall system stability and reliability.


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Sustainability & Efficiency Outcomes


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Enhanced concentrated water reuse rate while minimizing discharge volume.
Achieved substantial water conservation and operational cost reduction.
Fully aligned with client's dual objectives of economic efficiency and environmental responsibility.





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a01 (2)










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Project Outcomes


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This project demonstrates our technical capabilities in membrane system optimization and domestic membrane replacement for industrial applications. By implementing customized membrane solutions, we achieved stable system operation with reduced maintenance requirements and improved cost efficiency. The successful completion confirms that domestic membrane technology can serve as a reliable alternative in demanding water treatment scenarios, providing clients with a sustainable option that balances performance and operational economy.


The experience gained through this project has further strengthened our expertise in addressing challenging water treatment applications, particularly in the field of water reuse and resource recovery.





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1-连云港浓水回用项目

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Project Overview


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● Industry: Waste Incineration
● Client Need: Reduce landfill disposal, achieve resource utilization of waste salt derived from fly ash, and prevent environmental pollution - transforming waste into valuable resources.



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Industry Pain Points & Client Challenges


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Waste incineration facilities face mounting pressures from rising landfill costs for hazardous fly ash and increasingly stringent regulations on heavy metals and halogens. Our client, a waste management company in China, sought to convert high-chloride, heavy metal-laden waste salt - a byproduct of fly ash treatment - from an environmental liability into a compliant, reusable asset.





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温州飞灰废盐资源化项目 封面图










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Our Solution: Integrated Ceramic Membrane System


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We designed and delivered a customized ceramic membrane system to address the complex purification requirements of refractory waste salt:
Material Superiority: Utilizing ceramic membranes' exceptional corrosion resistance and anti-fouling properties, the system operates reliably in highly corrosive, high-chloride environments where conventional polymer membranes would rapidly degrade.
Process Synergy: The system effectively removes suspended solids, colloids, and heavy metal ions from waste salt solutions, enabling subsequent nanofiltration and crystallization stages to produce industrial-grade recycled salt that meets stringent purity and safety standards.
Modular & Scalable Design: The skid-mounted ceramic membrane unit - featuring stainless-steel piping, automated control panels, and robust membrane housings - integrates smoothly into existing treatment infrastructure, allowing flexible capacity scaling as operational needs evolve.





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温州飞灰废盐资源化项目NF装置2023

















温州飞灰废盐资源化项目高压NF装置2023










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Outcomes & Industry Impact


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Waste-to-Resource Transformation: Successfully converted waste salt into a high-purity industrial product, establishing a new benchmark for circular economy practices in solid waste management.
Environmental Compliance: Eliminated risks of heavy metal and chloride contamination, ensuring full adherence to rigorous environmental regulations and protecting soil and water quality.





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温州飞灰废盐资源化项目陶瓷膜装置2023 (2)







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Conclusion


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This project highlights our expertise in applying advanced ceramic membrane technology to hazardous waste treatment. It demonstrates how innovative filtration solutions can simultaneously advance environmental stewardship and resource recovery in the solid waste sector.

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MBR Filtration Principles


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MBR (Membrane Bioreactor) is a novel water treatment technology that integrates ‌biological degradation‌ (via activated sludge) with ‌membrane separation‌ to achieve efficient solid-liquid separation, replacing traditional sedimentation tanks. Its filtration principles can be understood from the following aspects.





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1 (24)










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Membrane Structure and Separation Mechanism


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MBR membranes come in two main types:

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● Flat Membranes‌: Plate-shaped, suitable for small-scale applications.
● Hollow Fiber Membranes‌: Hollow, fibrous structures with large specific surface areas per unit volume, widely used in household water purifiers.





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Hollow Fiber Membranes 拷贝

















Mem









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The separation process relies on the ‌micro-porous structure‌ of the membrane:

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● Water molecules and small solutes pass through the membrane's pores, while larger particles (e.g., activated sludge, suspended solids) are retained.
● The pore size of MBR membranes is typically around ‌0.1 μm‌ (some can be smaller), enabling effective removal of microorganisms and suspended impurities.





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Filtration Modes and System Operation


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MBR operates in two primary modes:

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● Hydraulic Head Pressure (HHP)‌: Utilizes the pressure difference between the feed water and permeate sides to drive filtration.
● Pump Suction‌: Uses a pump to draw water through the membrane, suitable for low-pressure systems.

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During operation, aeration is often employed:
Aeration causes the membrane fibers to vibrate, preventing fouling (deposition of sludge on the membrane surface) and ensuring stable filtration.





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3 (19)








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Integration with Biological Reactors


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MBR combines biological degradation (in the reactor) with membrane separation:
In the biological reactor, microorganisms break down organic pollutants. The membrane then filters out the microorganisms and suspended solids, producing high-quality effluent.
In summary, MBR leverages the micro-porous membrane's ability to separate by size, integrates biological treatment with physical separation, and uses aeration to maintain membrane performance, ultimately achieving efficient wastewater purification.

Picking the wrong Custom Water Treatment Equipment costs more than money. It is time-consuming, rework, and at times, compliance fines nobody plans to spend.

Therefore, before starting any project, engineers and plant managers often face the same critical question: should they implement membrane-based treatment or rely on chemical treatment?

Both methods have been in use for decades and are proven to work effectively. However, each is designed to address different challenges, and choosing the wrong approach can quickly impact operational costs and water quality.

This guide breaks down the functionality of each technology used in water treatment systems and explains which applications are best suited for each. If you are evaluating custom water treatment equipment for a new project, this comparison will provide clear insights to help you make an informed decision.



How Membrane Treatment Works
Membrane treatment is a physical process at its core. A pressure of water is exerted through a semipermeable barrier. Large contaminants cannot go through the membrane pores and are left behind. Depending on the type of membrane chosen, bacteria, viruses, small particles, dissolved salts, and organic matter can be blocked.

The filtration step in membrane systems is entirely chemical-free. Separation occurs through pressure and pore size rather than chemical reactions. This makes membrane systems the preferred choice in applications where chemical-free processing is essential, such as drinking water production or pharmaceutical-grade process water.

There are several types of integrated membrane systems, each specifically designed to achieve a particular water treatment objective.



Ultrafiltration (UF)
UF uses hollow fiber membranes with pores measuring 0.01 microns. At that scale, bacteria, colloids, and viruses are blocked consistently. Raw water enters a storage tank, gets pre-filtered to remove large particles, and then passes through the hollow fiber membranes. The backwash and air scour systems are automated to maintain the cleanliness of the membranes through continuous operation.

Membrane Bioreactor (MBR)
MBR systems combine biological treatment with membrane filtration. These are used in flat membrane and hollow fiber formats, both operating at 0.05 micron precision. They are popular in municipal wastewater treatment as well as the reuse of industrial effluent.

Reverse Osmosis (RO)
RO handles desalination and high-purity water production. QILEE's containerized RO skid systems are designed for brackish water with high hardness, elevated sulfates, or specific contaminants like fluoride and arsenic. The output is consistently high-quality pure water.

Nanofiltration (NF)
NF removes color, certain ions, and organic compounds. It sits between ultrafiltration and reverse osmosis in terms of selectivity and is useful for specialty process water and selective purification applications.

TMBR Modules
TMBR represents more advanced membrane bioreactor technology. These modules are built for wastewater streams that carry heavier or more complex contamination loads.



How Chemical Treatment Works
Chemical treatment takes a different approach. Rather than physically filtering water, chemical reagents are added to alter the behavior of contaminants. Suspended particles are aggregated through coagulation and flocculation, while fats, oils, and greases rise to the surface for easy removal. Heavy metals are precipitated out of the solution. Once these contaminants are separated, they can be removed efficiently through settling, flotation, or filtration processes.

This approach handles things that membrane systems struggle with. High-load industrial wastewater, effluent with heavy suspended solids, and streams carrying significant oil and grease content are all better served by chemical treatment.

Integrated Containerized Sedimentation Tank
With this unit, chemical dosing, flocculation, and high-efficiency lamella sedimentation are combined within one shipping container. It does solid-liquid separation of industrial and municipal wastewater and is designed to be set up on short notice.

QL-DAF Series
The QL-DAF Series is designed for industrial wastewater containing non-soluble contaminants. It combines chemical dosing, micro-bubble dissolved air flotation, and multi-media filtration to effectively remove suspended solids, colloids, and fats, oils, and greases. The system is fully automated and containerized, requiring no operator intervention—even when feed water quality fluctuates—ensuring consistent and reliable treatment performance.

Integrated Sludge Management System
This system combines high-efficiency sludge dewatering with automated polymer flocculant dosing. It reduces sludge volume significantly, and the dewatering process is performed within a single, compact, fully automated unit for maximum efficiency and ease of operation.

Ion Exchange and Electrodeionization (EDI)
These modules are utilized to remove targeted ions and are applied when high-purity water is required in the downstream of the primary treatment step.

Chemical Dosing Systems
Reagent dosing can be handled either as dry powder or liquid. Both systems ensure precise, automated delivery of chemicals throughout the treatment process, allowing consistent and efficient operation. Operators can choose between liquid or dry powder dosing depending on the specific requirements of the water treatment application.



Membrane vs. Chemical Treatment: Side-by-Side Comparison




Parameter



Membrane Treatment



Chemical Treatment





How It Works



Physical filtration through membrane pores



Chemical reactions that alter and separate contaminants





Chemicals Needed



Not required



Yes, including coagulants and flocculants





Output Water Quality



Very high, up to ultra-pure grade



Good to high, depending on the application





System Footprint



Compact and containerized



Compact and containerized





Daily Operation



Low complexity, runs on automated controls



Moderate, requires reagent monitoring





Best Suited For



Pure water, drinking water, high-purity industrial



Industrial wastewater, FOG removal, sludge treatment





QILEE Products



UF, MBR, RO, NF, TMBR modules



DAF, Coagulation, Sedimentation, EDI, Dosing Systems





Sludge Produced



Minimal



Higher volumes from chemical precipitates





Scalability



Modular and easy to expand



Modular and easy to expand






When Chemical Treatment Is the Right Choice
Chemical treatment is ideal when water contamination is severe and physical filtration alone cannot achieve effective results. This approach is preferred for water with high levels of suspended solids, significant oil and grease content, or chemically challenging industrial effluents that require targeted chemical processes to ensure proper treatment.

The food processing plants generate wastewater that has a high level of FOG, which is hard to treat without any pretreatment. Discharge of effluent that contains heavy metals or colloidal particles by industrial facilities usually requires chemical precipitation as an initial step. Primary treatment stages require sludge to be thickened and dewatered before disposing of it in a responsible manner.

Chemical systems are also commonly placed ahead of membrane systems as a pretreatment stage. Running coagulation or DAF first reduces the fouling load on membranes, which extends their service life and lowers the frequency of cleaning cycles.



Running Both Systems Together
Many water treatment installations do not rely on a single technology alone. Using custom water treatment equipment that combines chemical pretreatment with membrane polishing is a well-established approach, delivering the benefits of both systems for optimal performance and efficiency.

The typical setup feeds incoming water through a chemical coagulation or DAF stage first. This drops suspended solids and FOG levels to a point where the membrane system can operate efficiently. The membrane stage then handles the final polishing to deliver high-purity output.

This layout protects the membranes from heavy fouling, spreads the operational load across two systems, and makes it easier to hit tight output quality targets on a consistent basis.



QILEE's Engineering Approach
QILEE has been designing and manufacturing water treatment systems in Shanghai for over 20 years. The company holds more than 34 patents and has delivered systems across more than 5,000 projects in municipal water supply, industrial wastewater, pure water production, and large-scale desalination.

Every system is purpose-built for the client's application. Containerized formats keep delivery and site installation fast. Automated controls reduce the need for hands-on operator management during daily operation. Factory testing before shipment means that when a system arrives on site, it is already ready to run.

QILEE supplies membrane and chemical treatment systems both as standalone units and as fully integrated multi-stage plants, so clients work with a single engineering partner across the entire treatment process.



Visit QILEE for Custom Water Treatment Equipment
Many water treatment installations do not rely on a single technology alone. Using custom water treatment equipment that combines chemical pretreatment with membrane polishing is a well-established approach, delivering the benefits of both systems for optimal performance and efficiency.

The QILEE team is ready to assist—contact us today to submit your project inquiry.