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Landfill Leachate treatment system

Landfill leachate treatment system for a hazardous waste landfill incorporates heavy metals pretreatment followed by a tubular MBR system.

The MBR reduces:

ammonia
phenol
Polychlorinated Biphenyl (PCB)
chemical oxygen demand (COD)
volatiles and semi-volatiles
and other contaminants adequately for discharge

The system reduces PFAS 30-60% and carbon is utilized to reduce PFAS to low ppt concentrations.

Landfill leachate treatment systems with Membrane Bioreactors (MBR)s have developed many unique process improvements for industrial wastewater applications. Dynatec successfully uses Ultrafiltration (UF), MBR and Reverse Osmosis (RO) for landfill leachate applications.

Landfill leachate treatment system requirements

Treatment can vary, depending on the discharge requirements, and the contaminants present

Landfill leachate is characterized by:

High Total Dissolved Solids (TDS)
Heavy metals
High BOD
Color
High COD
High ammonia

Landfill leachate treatment systems options

The MBR option: an aerated biological mixed liquor process operating at very high solids concentrations.

The advantages are:

Long sludge age produces a well acclimated biomass. High concentration (typically 12,000 to 20,000 mg/l) provides very high rates of reaction
Excellent nitrification and de-nitrification
Smaller footprint then conventional aerated systems
High-quality effluent as a result of using membranes for final clarification
Lower sludge production than conventional systems

Typical MBR results in landfills:

Parameter	BOD	COD	TSS	Ammonia
Influent	500	4000	150	1000
Effluent	<5	800	<5	<1
% Removal	>99%	80%	>96%	>99%

The system produces bio-sludge, which can either be dewatered for disposal, or disposed of as a liquid sludge.

Alternative landfill leachate treatment options:

Chemical precipitation of metals before MBR treatment
RO after MBR treatment removes organic and inorganic contaminants, and color
UF followed by RO

The two effluent streams from a RO system are:

Permeate
Concentrate (or reject)

This can be re-injected into the landfill. Its long-term effects on leachate concentrations should be considered.

Conclusion

The MBR process provides the highest possible levels of organic removal with essentially zero suspended solids in the effluent. This is the ideal feed system for RO treatment.

RO permeate can be used for other non-potable purposes:

Irrigation
Truck washing
Dust control

Dynatec membrane treatment systems have successfully provided outstanding performance in many landfill leachate applications. Considerations for this technology include:

Membrane treatment offers reliable, consistent landfill leachate
Systems are highly cost effective, and require low levels of operator interface
The best membrane system configuration for each application should be individually evaluated
Membrane treatment is broadly applied in the US and abroad

Contact Dynatec Systems today to discuss your landfill leachate treatment solution.

https://www.dynatecsystems.com/industries/landfill-leachate-treatment/

SBR to MBR Conversion

Dynatec provided tubular ultrafiltration systems as part of an SBR to MBR conversion. The upgraded treatment system allowed the facility to meet all discharge requirements and increased the capacity of the plant. The SBR could treat 4,000 barrels per day and the upgraded plant utilizing an out-of-basin MBR treats up to 10,000 barrels of wastewater per day.

To meet direct discharge limits, the oil refinery needed to upgrade their treatment system. The existing SBR could not handle the volume of wastewater and was not consistently meeting the discharge quality limits.

The MBR reduced the COD to below 50ppm and phenols are reduced from over 750ppm to non-detect.

The solution for this plant was an oil water separator followed by out-of-basin membrane bioreactor (MBR). The permeate from the MBR met all requirements for discharging to sea water. COD in the permeate was less than 300ppm. Phenols in the permeate were consistently less than 1ppm.

Dynatec provided containerized systems for easy and fast installation at site.

Significant Savings

Simple process
Fewer chemicals needed
Low maintenance

Technology Benefits

Consistent high-quality water
Low operating costs
Minimal operator intervention required
Reduced sludge disposal costs

Contaminants Removed

Oil and grease
Heavy metals
COD
BOD
Suspended solids
Phenols

Flexible Retrofits

Since the membranes were installed outside the reactor, the membranes allowed for easy retrofit to any bioreactor configuration (circular, rectangular, above or below ground), . Frequently, the existing infrastructure and building space can be reused with little or no changes.

Expandability

The membrane system is easy to expand, since the out of basin configuration allows for simple addition of more membranes, or membrane skids.

Better Performance

The MBR System eliminates many of the unit processes associated with conventional treatment systems. The bioreactor tanks degrade constituents normally considered recalcitrant and they eliminate solids carry-over from occurring, allowing long sludge retention times.

Contact Dynatec to discuss your application.

https://www.dynatecsystems.com/technologies/membrane-bioreactors/mbr-conversion-r…pgrade-solutions/ ‎

Silver Recovery at Microcircuit Plant

The Problem

A microcircuit materials production facility produces high purity silver in their process. The process produces a wastewater stream containing valuable dissolved silver compounds. The plant had an existing membrane treatment system to recover the silver from the wastewater, but the system had performance problems, required excessive maintenance and chemical cleaning costs were high.

The Solution

When the plant expanded its operations, they performed an evaluation. The choice was between expanding the existing membrane system or installing a Dynatec membrane system designed for simple automatic operation with low operating costs. Dynatec was ultimately selected to provide a complete system because the Dynatec design offered a more reliable, easier to operate process. The installation includes transfer pumps, two reaction tanks, three ultrafiltration skids designed for 25 gpm each with room for expansion, a sludge conditioning system, and a filter press. Silver recovery at microcircuit plant

The Process

Wastewater from the process is stored in an equalization tank. Transfer pumps deliver the equalized wastewater to the first reaction tank where DTC (dithiocarbamate) is added to react with the aqueous silver compounds to form insoluble metal salts. The water then enters another reaction tank where the pH is adjusted to optimize precipitation of the silver compounds.

The precipitated silver compounds are then filtered in one of the three ultrafiltration skids. The ultrafiltration system, using tubular PVDF membranes are designed for automatic operation. When the membranes become fouled, the operator initiates an automatic cleaning, and the system performs a chemical membrane cleaning and the ultrafiltration skid is brought back into service.

The permeate from the ultrafilter is discharged and the concentrated silver is sent to a sludge conditioning tank where a high molecular weight cationic polymer is added to aid in filterability of the sludge. The sludge is then sent to a filter press and the cake is sent to a silver reclamation facility.

Conclusion

The installation of the new system was successful. The system has been operating for several years. Current operation at the plant consists of operating two filtration skids at a time with one as a standby. The system is designed to add capacity by simply adding membranes to the existing UF skids. Operators are happy with the system’s operation and the lower amount of maintenance and chemicals required.

Contact Dynatec to discuss your wastewater application.

https://www.dynatecsystems.com/industries/heavy-metals-removal/

Ultrafilter for Metals Removal

A metallurgy facility needed to remove metals from their wastewater. Bench scale treatability work performed by Dynatec proved the effectiveness of the ultrafilter (UF) system. The UF system removed chromium, copper, zinc, nickel, and other metals to low parts per billion levels needed for surface water discharge.

The company produces ferrous metals (atomized steel and sponge iron) for use by auto parts makers and other manufacturers. The steel and iron powders are used to make structural parts, filters, and bearings, as well as, in friction applications such as brake pads and linings.

Dynatec has hundreds of installations in similar applications.

Ultrafilter for metals removal

Ultrafilter for metals removal can be achieved by chemical precipitation simply using hydroxide or sulfide precipitation. However, complexed metals have other chemistries available to cause precipitation to occur, typically in a simple one-step operation. There is no need to enlarge or flocculate the precipitated crystals, as is typical in conventional chemical systems since the pore structure of the membrane will retain the small precipitated crystals.

When oils are or may be present in the waste stream, the positive filtration provided by ultrafiltration prevents upsets that can occur with settlement or flotation devices. The membrane prevents passage of both oils and solids, including the precipitated heavy metals from passing, creating a concentrate of the metals.

If the waste stream consists principally of oils, a concentrate of the oils that will also contain the heavy metals is created that can be disposed of to oil recyclers. When the same type of waste is treated using DAF or clarifier technology, a sludge is created that can only be disposed to a landfill, and the benefit of reuse is lost and disposal is more expensive.

When the waste stream consists mostly of metals and suspended solids, the addition of a precipitant allows the waste to be simply ultrafiltered. The amount of sludge created is much less than the amount created using other technologies.

Dynatec’s design of ultrafiltration systems for heavy metals separation utilizes tubular membranes operated at high flow velocities. This design allows for high concentrations of metals and/or oils, and/or suspended solids in solution while minimizing cleaning maintenance of the membrane system.

Dynatec has provided systems for:

Heavy metals removal
Precious metals removal and recovery
Complex wastewater streams

Ultrafilter for Metals Removal Solutions

Ultrafiltration (UF) for metals removal
- Heavy Metals
- Metals in wastewater with oils and grease
- Precious Metals
- Metals in wastewater with chelating agents
Ultrafiltration (UF) for reuse
Reverse Osmosis (RO) for high purity water reuse
Complete turnkey system solutions
Filtration for sewer discharge of direct discharge to environment

Dynatec has designed and provided systems for reuse for:

Wash water
Rinse water
Plant processes
Cooling tower
Boiler feed

Contaminants Removed

Oil and Grease
Heavy Metals
Precious Metals
Lubricants
Surfactants
Acids
Biochemical Oxygen Demand (BOD)
Chemical Oxygen Demand (COD)
Suspended Solids
Dissolved Solids

Please reach out if you have any metals removal projects that we can help with.

https://www.dynatecsystems.com/technologies/membrane-technologies/ultrafiltration-systems/

Turnkey Solutions

Turnkey solutions provided by Dynatec include equalization tank, oil water separator, ultrafiltration (UF) process tank, UF system, and permeate and concentrate tanks. The customer, an industrial research facility, had a wastewater treatment facility that also treats the waste from several other manufacturers that occupy buildings nearby, recently purchased an UF system from Dynatec. The UF system replaced a DAF system that was not effectively handling the contaminant load from these facilities, including oily waste, heavy metals, and suspended solids due to the frequent changes in the wastewater characteristics. The customer also chose to have Dynatec install the system. The UF system has allowed them to meet their discharge requirements with less operator attention and effort.

Dynatec’s team of mechanical, chemical and electrical engineers have decades of experience to provide everything you need, from start to finish. This includes evaluation, system design, installation, system startup and training. Our focus has always been to produce the most cost-effective long-term answer for our customer. All turnkey systems are custom designed and installed for your specific needs.

Two different sets of disciplines are employed for this stage of the process. First, years of process experience produce effective process design. Our ownership and operation of treatment systems produces invaluable field experience that is translated into operator-friendly equipment. Next, the process design is translated into a complete integrated treatment systems by our experienced engineering staff.

Single source of responsibility
Problem evaluation
Process and system design
Equipment
Installation service
System startup
System startup consists of a three-step process:
- The equipment is commissioned by proving each of the field instruments
- The equipment is wet-tested
- Equipment is operated on process fluid to prove operation under normal conditions
Training by Dynatec engineers

Dynatec obtains membranes from a wide variety of suppliers, always aware of the need to produce lowest lifetime cost. Our suppliers produce membranes in a variety of materials, as well as a number of configurations for most effective solutions. In addition, Dynatec procures other equipment required to complete the project.

Dynatec manufactures modular equipment so that installation costs are kept to a minimum. Supervised by experienced competent engineers. Our usual method of operation is to hire local contractors approved by our customer.

Proven Installed Turnkey Solutions

At Dynatec, we are not just experts in providing reliable equipment for industrial applications, we also provide the proven solutions that our global clients need.

For more information on our design-build turnkey solutions for your install, please contact us today.

https://www.dynatecsystems.com/engineered-installed-wastewater-treatment-and-recovery-plants/design-build-turnkey-solutions/

RO Concentrate Evaporation

Waste Management’s Atlantic Landfill RO Concentrate Evaporation Project Short Listed for 2022 GWI Industrial Project of the Year

This project utilizes Dynatec’s MBR and RO. The reject from the RO is evaporated using waste heat from the on-site power generation. It is a great project overall and this is a cost effective and sustainable approach to handling RO reject.

WAVERLY, VA – WM’s 120,000GPD leachate evaporation project, developed in partnership with Heartland Water Technology, was shortlisted for the Global Water Intelligence’s 2022 Industrial Project of the year. A 120,000GPD (450m3/d) evaporation solution for reverse osmosis (RO) concentrate at the Waverly landfill site in Virginia, US., this project addresses the challenges of RO concentrate waste stream treatment and disposal.

Dynatec specializes in extensive industrial reverse osmosis (RO) membrane systems and nanofiltration (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

This process is commonly used to purify water and remove salts and other impurities. It 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.

Industrial Reverse Osmosis/Nanofiltration 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 th

e operator’s time.

Contact Dynatec to discuss your wastewater application.

https://www.dynatecsystems.com/industries/landfill-leachate-treatment/

Decentralized Wastewater Treatment Facility

Dynatec provided the membrane system for a demonstration plant situated directly adjacent to the Anaheim, CA City Hall. The system is designed to pump wastewater from a local sewer line, treat the wastewater for reuse, and return the waste activated sludge and screenings to the sewer line.

The DynaLift™ out-of-basin membrane system was selected because:

The high flux rates achieved by the DynaLift™ system allowed for a small footprint
High MLSS concentrations allows for smaller reactor tanks
The positive filtration achieved with MBR provides consistent high-quality discharge
The out-of-basin design allows for better demonstration of the technology
The membrane construction allows for high removal of bacteria and virus – demonstrated 5-log removal of bacteria and 4-log removal of virus.

The plant design is for two trains with the first train presently installed. The design flow of this plant is 75,000 gallons per day, and due to internal water uses, such as screen flushing, the net output of the final plant when fully installed will be 104,350 gallons per day. The recycled water is used for irrigation and toilet flushing within the requirements of California’s Title 22 Regulations.

Plant automation design allows for periodic operator attention only when equipment maintenance or chemical refilling is required.

Following treatment in the MBR, the effluent is further treated using ozone followed by UV for ozone destruction and chlorine addition at 1 mg/L to ensure no re-growth in the final effluent.

Due to the proximity of City Hall and the fact that the plant is in a highly populated area, a state-of-the-art odor control system was installed. With the standard Dynatec design odor control is not typically required.

This is the first facility in California to use external MBR membranes, ozone and chlorination for water recycling. The use of decentralized wastewater treatment facilities is increasing and the City of Anaheim is in the forefront of this.

Contact Dynatec Systems today to discuss your wastewater reuse project.

https://www.dynatecsystems.com/industries/sanitary-wastewater/

PFAS Removal from wastewater

Per- and polyfluoroalkyl substances, or PFAS, is a group of thousands of synthetic chemicals that were used for decades in the manufacturing of many consumer goods like waterproof clothing, non-stick pans, stain resistant fabrics, food packaging, and in industries like paper and cardboard manufacturing, metal plating, wire manufacturing, plastic manufacturing, and many other applications.

While providing desired characteristics to the many products in which they were used, PFAS chemicals have been tied to various negative health effects. Also of concern is the fact that they are very stable and break down very slowly in nature. PFAS chemicals are found in the environment and in the bloodstreams of people all over the world.

Dynatec has provided systems to remove PFAS from industrial wastewater to customers across the country and has dozens of systems in operation. While there are other technologies in various stages of development, there are two proven technologies for removing PFAS from industrial wastewater: carbon and reverse osmosis (RO). Dynatec has used both granular activated carbon (GAC) and RO for PFAS removal and we can help with the selection of treatment technology for a given application.

Landfills are a major accumulation location for PFAS as most of the PFAS laden products ultimately end up there. As the leader in landfill leachate treatment, Dynatec Systems has vast experience in treating complex, high strength wastewater and removing PFAS from these wastewater streams. With discharge limits shrinking across the country to single digit parts per trillion (ppt) for some of the most common PFAS compounds like PFOS and PFOA, most of our customers have non-detect levels of nearly all of the tested PFAS chemicals, even where the raw wastewater or leachate has individual PFAS compound concentrations of 3,000 to 5,000ppt or more.

We can design a system to meet any discharge requirement.

Please contact us today to discuss your PFAS removal needs.

https://www.dynatecsystems.com/technologies/pfas-removal/

Tubular UF MBR system for dairy wastewater

Tubular UF MBR system was a conversion of an existing extended air system. An existing bioreactor is also being utilized. The capacity of the existing bioreactor was doubled with an increase in the mixed liquor solids concentration and an upgrade of the fine bubble aeration to slot injector aeration.

Membrane Bioreactors

Membrane bioreactors offer a unique and effective solution for the treatment and reuse of industrial wastewater in industries such as landfills, automotive, aerostructures, distilleries and dairies. Our industry-leading designs and innovation also deliver superior performance for sanitary wastewater and biological nutrient removal applications.

The MBR configuration has proven to be optimal for treatment of many industrial wastewaters when treatment efficiency is an important consideration.

The MBR is the ideal bioreactor configuration for treatment of organic or inorganic contaminants present in industrial wastewaters. MBRs operate at a higher efficiency while achieving consistent design performance objectives. This makes MBR a more cost effective method of treatment when performance and tank requirements are considered.

Bioreactor systems such as the conventional activated sludge system, sequencing batch reactor system and trickling filters are typically designed for operation at a lower volumetric removal rate, requiring larger tanks and more space. These conventional systems often experience upsets that inhibit settling and therefore require much more operator attention than a membrane bioreactor.

The MBR has proven to be optimal for treatment of many industrial wastewaters because it is less susceptible to upsets. The MBR’s performance is not affected by changes in sludge settleability like the conventional systems, making MBR a wise choice for industrial systems that have more difficult to treat waste streams. Dynatec has over 42 years experience in dealing with difficult to treat industrial wastewaters using membrane filtration.

Tubular UF MBR system

For more information on tubular UF MBR system, please contact us today.

https://www.dynatecsystems.com/technologies/membrane-bioreactors/mbr-conversion-r…pgrade-solutions/ ‎

Chemical Manufacturer

Chemical manufacturer needed a wastewater treatment plant capable of producing high-quality permeate from raw wastewater. They had high concentrations of oil and grease, Total Suspended Solids (TSS), Biochemical Oxygen Demand (BOD), and Chemical Oxygen Demand (COD). Dynatec designed and manufactured a system including an Ultrafilter (UF) to removed Oil & Grease (O&G) and TSS. An MBR to further treat BOD and COD. The permeate is free of O&G, TSS, and BOD, while COD is greatly reduced. The system was designed so future expansion is easily achieved.

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.