AST Unique Micro Filtration Technology
In view of the growing necessity of water and waste water treatment systems among the developing heavy industry, AST has been established with the aim of pursuing excellence in water filtration technology to enhance the health and quality of life while protecting the limited natural resources in our environment.
Over the years AST has evolved into a comprehensive provider of a wide range of water and wastewater treatment solutions, products and services. This has been achieved through our technologies, technical know-how and strong support from our product principals and the commitment of our highly competent and innovative engineering, project and service teams.
AST is a comprehensive provider of a wide range of water and wastewatertreatments solutions. We developed a unique micro membrane filtration technology that specializes in the following areas:
- Membrane filtration system: micro filtration, ultra filtration, reverse osmosis, Continuous Electrode ionization system (CEDI).
- Domestic water filtration system.
- Potable water treatment system.
- Wastewater treatment and recycling system.
- Physical chemical treatment system.
- De-ionized (ultra pure) water treatment system and water softener system.
- Biological treatment system (COD and BOD removal).
- Oxidation and UV system.
- Water and wastewater treatment chemicals.
Purposes
The micro membrane filtration technology is usually used for removing contaminants from waste water coming out of several types of heavy industries like:
- Petrochemical & Plastic Industry.
- Chemical Industry.
- Food Processing Industry.
- Pharmaceutical Industry.
- Metal and Metal Plating Industry.
- Textile and Dying Industry
Conventional Ultra-Filtration Methods
The Ultra-filtration membranes is in form of hollow fiber, the membrane is made from a polymer composite that has billions of tightly controlled microscopic pores that are 0.01 microns nominal in size. The ultra-filtration hollow fiber membrane is in symmetric configuration which is capable for both direction of filtration (outside-in or inside-out filtration). The ultra-filtration membrane material is a modified polymer with hydrophilic characteristic which exhibits high flux filtration.
Ultra-filtration is a separation process using ultra-filtration membranes with pore sizes in the range of 0.1 to 0.01 micron. Ultra-filtration is a filtration technology that removes suspended or dissolved solids, which have high molecular weight substances, respectively, from water or other liquids. Low molecular weight organic and ions such as sodium, calcium, magnesium chloride and sulfate are not removed by ultra-filtration membrane. This process is easy to realize and, more importantly, without extensive chemical additives and with very low energy usage.
Water naturally flows through the pores from the inside-out through the ultra-filtration membrane wall under very low pressure. The pores physically block particles, turbidity and pathogens such as bacteria, viruses and cysts. Most current water treatment technologies are based on absorption, concentration or intensity, which can be affected by sudden spikes in turbidity or pathogen concentration. The Ultra-filtration membranes provide water filtration using physical size exclusion, resulting in a consistent supply of high quality treated water regardless of the inlet quality. The ultra-filtration membrane not only filters but also disinfects the water in one step.
Most of the Ultra-filtration membrane is operate from the inside to the outside during filtration. This means that process fluid flows through the center of the hollow fiber and permeate passes through the ultra-filtration membrane fiber wall to the outside of the ultra-filtration membrane fiber. Tangential flow can help limit membrane fouling. Other operating techniques that can be employed with hollow fiber ultra-filtration membrane systems include backwashing with permeate at reverse flow.
AST Micro/Ultra-Filtration Improved Technology
AST has developed an improved Micro/Ultra-Filtration technology that combines several types of Micro/Ultra-Filtration membranes in one water treatment system. The combination of several types of Micro/Ultra-Filtration membranes using computerized software to determine and calculate an effective water treatment process help AST to develop a system that fits each customer's specific requirements.
Each water treatment system can combine the following types of micro/ultra-filtration membranes:
Hollow Fiber (HF) Ultra-Filtration Membrane
The uniform pore structure of the membrane builds an impenetrable barrier for all bacteria and other microorganisms. Multi-bore ultra-filtration provides bacteria-free water, without the use of added chemicals.
Spiral (RO & NF) Ultra-Filtration Membrane systems
Spiral wound construction makes use of flat sheet membrane, which is an organic polymeric membrane cast onto a support fabric. The flat sheet membrane is enclosed between layers of feed spacer and permeate carrier materials, forming a leaf. Multiple leaves are rolled into a cylinder, and attached to a permeate tube.
Spiral wound construction allows the membrane to perform filtration duties only, there are no structural component requirements imposed on the membrane. Spiral construction uses the support fabric, feed spacer and permeate carrier to encase the membrane, providing superior integrity. Since the spiral membrane was developed 37 years ago, membrane structural integrity has never been an issue. Conversely, hollow fiber membranes must perform as a filter and provide structural integrity as well, which has resulted in a common fiber breakage and integrity problem.
Tubular Ultra-Filtration Membrane
Tubular membranes are not self-supporting membranes. They are located on the inside of a tube, made of a special kind of material. This material is the supporting layer for the membrane. Because the location of tubular membranes is inside a tube, the flow in a tubular membrane is usually inside out. The main cause for this is that the attachment of the membrane to the supporting layer is very weak.
Tubular membranes have a diameter of about 5 to 15 mm. Because of the size of the membrane surface, plugging of tubular membranes is not likely to occur. A drawback of tubular membranes is that the packing density is low, which results in high prises per module.
AST complete turnkey projects for membrane Filtration Applications
We at AST succeeded to fit the improved membrane technology for the following applications:
- Heavy metal removal in metal finishing fluids
- Pre-reverse osmosis filters for water treatment
- High solids removal in electroplating solution baths
- High solids removal from completion fluids
- Desalination of Saline and high COD applications
- Cutting fluids recycling in silica grinding and slicing
- Heavy metal removal from incinerator scrubber water
- Cooling tower blow-down recycling and/or side stream filtration
- Brine recycling in water treatment systems
- Wastewater processing from the chemical,
- micro-electronics and pulp and paper industries
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