Wastewater processing is a global problem with enlarged expansion projects for petroleum, real estate, automobile, battery, electrical, garments, leather, health care, dairy, food processing industries, etc. Increased water pollution reduces available drinking water for the global population and puts the entire living organism ecosystem at risk as they hold the potential to pollute more water bodies.
The human race made sufficient achievements in water purification technology and the latest methods can deliver a huge volume of clean water. Several private corporations and international government agencies are joining hands to find better solutions to treat polluted water. PTFE membrane distillation, ammonia remove membrane, and ultrafiltration water treatment is some of the best industrial wastewater treatment processes.
Ultrafiltration Water Treatment— an Ultimate Tool for Purification Plants
- Definition of UF Treatment
Ultrafiltration water treatment is a filtration method using membranes with hole sizes in the series of 0.1 to 0.001 micron. Characteristically, ultrafiltration will eliminate high molecular-weight (MW) particles, colloidal materials, and polymeric chemical elements. Low MW organics and charged particles such as sodium, magnesium chloride, calcium, and sulfate are not filtered away. Because only big elements are removed, the osmotic pressure variance across the membrane surface is negligible.
- Working Principle
Ultrafiltration water treatment employs hollow fibers of membrane material, and the feed wastewater flows either inside the shell or in the fibers’ tubular structure. Liquefied solids and solutes of high MW cut-off are retained by the membrane, while water and low MW solutes pass through the membrane. Ultrafiltration is not different from microfiltration, reverse osmosis, and nanofiltration, excluding the size of the particles it retains. When tactically combined with other refinement technologies in a complete water system, UF is perfect for the removal of the followings:
- Viruses, and
- Macromolecules larger than the cut-off MW
- Benefits of Using UF Treatment
The benefits of ultrafiltration water treatment are:
- Any processing chemicals are not required: flocculates, coagulants, disinfectants, pH adjustments, etc.
- Size-prohibiting filtration as contrasting to media depth filtration
- The decent and constant quality of the effluent in terms of pollutant removal
- Easy process and less plant size
- High level of method automation
- Eco-friendly treatment process
- Design Implementations
Top-quality UFs have an exclusive design that usage hollow fiber membranes.
Thousands of hollow fiber membranes (tubular structure) are coiled together in packages inside a shut housing that is held in place in a packing. The length of the compressed fibers could be as long as 5.5 miles. Pre-treated feed wastewater passes into the ultrafiltration water treatment membrane module and forced into the hollow fiber membrane packages, filtering it and passing out of the tank as clean water. The system flows, backwashes, and cleans membranes by reversing the direction of flow.
- Scope of Application
UF is an efficient tool for removing total submerged solids like tannins, sediments, micro-plastics, bacteria, and viruses. Application scopes are:
- During an emergency or a disaster response situation
- Providing clean drinking water in remote or developing countries
- Used in self-sustaining MBR packaged treatment systems
UF systems comprise extremely fine membrane sieves that require to be properly washed, such as ammonia remove membrane. The cleaning process chosen depends on whether a UF method is being used to eliminate organic or inorganic pollutants or even both. For removal of organic contaminants, the over-all cleaning protocol for the washing of tubular membranes is to use less foam, a medium alkaline cleaner at 0.6% to 1% for a maximum of 40 to 60 minutes. The best action is with citric acid at a maximum concentration of 3.0 % to eliminate inorganic contaminants. The acid should flow for 1 to 3 hours. Hydrochloric acid can also be used to wash membranes, as can oxalic, sulfuric, and nitric acid.
- Water Treatment Steps Involving UF Membrane
Industries that use large volumes of water or release highly toxic effluent are the potential consumers to set up ultrafiltration treatment for water reuse. These include:
- Steel processing and manufacturing
- Plastics & resins processing
- Paper & pulp industry
- Pharmaceutical & chemical factory
- Food & beverage industries
- Oil refineries
- Municipal residential areas
- Hospital and nursing homes
There are three main steps of the wastewater purification process, frequently termed as primary, secondary, and tertiary treatments. More high-tech purification is required for some regulatory purposes known as the quaternary water treatment method. This stage handles the ppm to ppb levels of pollutants and normally involves oxidation or specific filtration processes.
- Primary wastewater treatment
- Secondary wastewater treatment
- Tertiary wastewater treatment
PTFE Membrane Distillation—to Remove Chemical Pollutants in Water
PTFE (polytetrafluoroethylene) distillation membranes retain liquid controlled and, at the same time, allow VOCs to separate. It is made conceivable by the built-in properties of hydrophobic PTFE collectively with pressure.
Latest technology hydrophobic PTFE membranes deliver the perfect combination of high power, high WEP while upholding a very high airflow rate for PTFE membrane distillation processes.
- Features and Benefits
There are numerous benefits of employing PTFE distillation membranes. They are:
- High chemical resistance and hence increased service life
- Substantial durability to get maximum throughput
- Maximum WEP
- Extremely high airflow rate for the best rate of reaction
- Ultraclean effluent with very low shedding
PTFE membrane distillation or ammonia remove membrane finds usage in a wide network of services:
- In high-salinity wastewater treatment process to remove extra salts from feed water
- RO reverse osmosis wastewater processing
- Oilfields with excessively high salinity wastewater treatment plants
- Recycled sewerage water processing
- Epoxy resin related works
- Volatile organic wastewater removal
- Treatment of wastewater containing cyanide as a pollutant
- Processing of wastewater with phenolic properties
- Handling of acrylonitrile organic complex within the feed wastewater
- Low alcohol content wastewater treatment
- Removing ammonia from recycling wastewater
- Performance Characteristics to Prioritize When Purchasing
The correct choice of PTFE membrane distillation or ammonia remove membrane affects the water treatment project’s commercial success. Some of the criteria for product selection are:
- Whether to get PTFE with PP support or PET support or without any support at all
- The requirement of the airflow rate for the PTFE membrane distillation process
- Consider water feed pressure into the processing system
- Pollutants to be handled within wastewater like oleophobic or hydrophobic
- Considering the Membrane Thickness
- Getting an idea about the max operating temperature of the MBR system
Ammonia Remove Membrane
The outer side of porous PTFE hollow fiber membranes is powerfully hydrophobic (water-repelling) and suited for ammonia remove membrane. Membranes with air-filled holes are near water-impervious but highly permeable to some chemical gases, e.g., ammonia. The film wall with the dry pores is an ammonia/liquid edge. The fluid phase is feed wastewater. The ammonium transfer goes from the fluid phase into the absorption medium, which is a liquid. The potential chemical difference across the membranes drive ammonium mass transfer.
This article will guide you through a detailed idea about water treatment plants that involve the latest membrane technology resources, such as ultrafiltration water treatment, PTFE membrane distillation, and ammonia remove membrane. The requirement for wastewater processing facilities is increasing, and new work orders are coming in from various private industries, government agencies, or municipal residential complexes. Oxymembrane is the place to go for all sewage treatment and wastewater treatment-related services, design ideas and execution, spare and consumable parts, replacements, and easy set-ups.