Tank Truck Wash Water
A tanker truck operator built a new operations terminal part of which contains a wash facility to wash the interiors of trucks and the exterior of the tankers and tractors. The operation is a contract hauler so a wide variety of liquids will end up in the wastewater.
The facility obtained a sewer discharge permit that had restrictive oil and grease and metals limits but also had a daily discharge volume limit of 7,000 gallons.
Among the commodities transported are oil products, sugar, chemicals, acid, and caustic, as well as many other organic products. The system design, therefore, had to accommodate all these potential contaminants in the water.
The system design includes free oil separation, pH control and final treatment using ultrafiltration (UF). This treatment was designed to treat the wastewater to meet the sewer discharge limits despite variations in the waste stream.
Water having had the free oil, suspended solids, and emulsified oils removed and having had the pH controlled is suitable for use as wash and first rinse water in the tank washing operations. This, therefore, became part of the system design to conserve water and to enable the facility to meet the sewer volume discharge limitation. Because this was a new facility, there was not an opportunity to complete treatability studies on the wastewater. Dynatec Systems prior experience in similar/like applications served as the basis of design.
Tank Truck Wash Water Ultrafiltration
The ultrafilter is configured in a crossflow (tangential) flow process, a membrane pore size of 0.07 micron. It is used to reject colloidal and emulsified components in water. A high rate of flow across the membrane is maintained to cause turbulence. This, in turn, prevents fouling of the membranes.
For many waste applications like this one, a tubular membrane is specified to prevent the possibility of plugging of the membrane element and to concentrate the contaminants to a high concentration.
Tank Truck Wash Water Results
The system continues to meet the demanding discharge requirements. About 50% of the water produced is reused for wash and first rinse, both for the interiors of the tankers and for the exteriors of the vehicles.
The system is simple to operate and maintain. Variations in the quality of water being fed to the system caused by different chemicals being cleaned from the tankers does not cause variations in the quality of discharge.
Contact Dynatec Systems today to discuss your wastewater application.
https://www.dynatecsystems.com/technologies/membrane-technologies/ultrafiltration-systems/
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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