Chemical plant wastewater treatment
Chemical plant wastewater treatment was failing to meet discharge limits, installed a Dynatec UF system to separate emulsified fats, oils, and grease (FOG) from their permeate. The raw wastewater has more than 2,000ppm of emulsified FOG with peaks much higher at times. The system consists of four UF units and related components. The system currently treats 66gpm, but all 4 units are expandable. The permeate is free of FOG and is acceptable for discharge.
https://www.dynatecsystems.com/technologies/membrane-technologies/ultrafiltration-systems/
Chemical wastewater treatment utilizing membrane systems that range from selective separation of product to wastewater treatment and reuse. Dynatec Systems has provided many different chemical wastewater solutions.
Chemical Wastewater Treatment Solutions
- Ultrafiltration (UF), Nanofiltration (NF) and Reverse Osmosis (RO) for selective separation of product for recovery
- MBR biological treatment
- Wastewater reuse with MBR
- Conversions of existing systems to MBR
- Expand existing bioreactor treatment capacity
- Improve discharge quality
- Produce water for reuse
- Reduce surcharge
- High purity reuse with MBR and RO
Contaminants Removed
- Organics
- Inorganic solids
- Phenol
- Solvents
- Oils
- Acids
Ultrafiltration offers the following advantages over conventional separation:
- No chemical required
- Very little labor required
- Simple mechanical process
- Less sludge
- Ability to concentrate the retentate for beneficial use
- Less space required
- Overall lower operating costs
Dynatec specializes in extensive RO and NF membrane systems to remove soluble components of wastewater that may not have been removed by primary treatment. In most cases, the purified water can be reused.
RO is capable of rejecting soluble constituents of aqueous streams, such as:
- Bacteria
- Salts
- Sugars
- Proteins
- A wide range of organics and colors
- Improves the color, taste and properties of the fluid
RO can be used to purify fluids such as ethanol, which will pass through the reverse osmosis membrane, while rejecting other ions and contaminants from passing.
RO/NF systems
The most common use for reverse osmosis is in purifying water. It is used to produce water that meets the most demanding specifications. This differs significantly from other RO systems that are often only designed to treat potable water. Our system is specifically designed to accommodate:
- Minimize reject volume
- Variable characteristics
- Minimize fouling
RO and NF Technology
RO uses a membrane that is semi-permeable, allowing the fluid that is being purified to pass through it, while rejecting the contaminants that remain. Most NF and RO systems are operated in crossflow to allow the membrane to continually clean itself.
Integrated clean-in-place (CIP)
The membrane skid has an integrated CIP system on the skid. This is especially important for wastewater reuse systems because the cleaning frequency of the skid is often higher than in other RO applications. With an integrated CIP system, cleaning is fast and easy, minimizing the operator’s time.
Tubular Configuration:
- Higher permeate rate
- Lower rates of fouling
- Higher concentration of retentate
- Easier to clean
- Longer membrane life
- Low operating cost
To discuss your wastewater treatment solution, please contact us today.
Complete membrane filtration system
Complete membrane filtration system for a commercial wastewater treatment company provided by Dynatec Systems. The system gives them the ability to meet demanding requirements for discharge with the tubular ultrafiltration (UF) systems followed by two stage reverse osmosis (RO). They can safely meet the requirements for PFAS, 1-4 dioxane, heavy metals, chemical oxygen demand (COD) and total dissolved solids (TDS).
Membrane Technologies
Membrane Technologies have several membrane configurations available for Membrane Bioreactor (MBR) applications. Project requirements should drive the decision for membrane selection.
Technologies available for use in MBRs:
- Tubular
- Hollow Fiber
- Flat Sheet
Tubular Membranes
The original and most proven type of ultrafiltration is tubular membranes:
- Sturdy construction
- Long membrane life
- High flux rates
Of all membrane types, they are more robust and can be subjected to high pressures in demanding applications.
Out-of-Basin MBR is a configuration where mixed liquor is pumped at high velocity through the tubular membrane module. The high velocity continuously scours the membrane surface and prevents solids from building up. This process produces high flux rates and simple operation. No backwash is required. Lowest capital cost option because of the high flux rates and simple operation. Out-of-Basin MBRs by Dynatec are designed so that the energy requirements are equal to other types of MBR systems.
Advantages
- Higher performance due to higher MLSS and long sludge age
- Low Cost
- Simple Operation
- Entire system may be placed indoors
- Membrane tank not required
Hollow Fiber Membranes
They are constructed of a microporous structure having a dense selective layer on the outside surface. Many fibers must be packed into bundles and potted into tubes to form a membrane module. The surface area of even a few square feet require miles of fibers. Modules must contain no defective or broken fibers, therefore production requires strict quality control.
These membranes can withstand very high pressures from the outside, but are limited on pressure exerted from the inside of the fiber, therefore backwash rates are limited to around twice the normal permeate rate. The feed fluid is applied on the outside of the fibers and the permeate is removed down the fiber bore.
Hollow Fiber membranes are applied in clean water applications and are used in MBRs, but are limited to lower concentrations of solids than the other membrane types.
Advantages
- Low Energy
- Membrane Space efficient for large installations >5 MGD (million gallons per day)
- Cost effective for large installations
Disadvantages
- Not Cost Effective for small plants
- Membranes damaged easily
- More complicated system
- Cannot operate with high MLSS
For more information on membrane filtration systems, please contact us today.
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