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Clarifier Underflow Heavy Metals Removal

This plant was faced with a land ban of their main clarifier metal hydroxide underfiow sludge (2-3% solids) because it did not pass the EPA “Paint Filter Test”.  This clarifier treated the entire plant effluent and removed primarily lead, zinc, and copper. To satisfy the RCRA land ban restrictions, the plant hired mobile dewaterer who used a manual, recessed-chamber filter press that produced sloppy cakes. These cakes had to be shovelled into dumpsters for off-site disposal. The Oberlin Filter technology was installed replacing the mobile dewaterer. As the below table shows excellent effluent quality at very high, 10,000 gpd capacity and 900 gfd flux. The cakes were sufficiently dry (50% solids vs. 40% requirement) to pass the “Paint Filter Test” and were acceptable to the hauler/landfill operator at a significant cost saving to the plant. The Oberlin Filter system operates automatically at significant labor savings compared to the manual press. 

Heavy Metals Removal from Chemical Plant Wastewater

This plant was faced with severe heavy metal discharge restrictions based on recent EPA chronic toxicity regulations (ie, 15 ppb Cu, 60 ppb Pb, 130 ppb Ni, 150 ppb Cr, and 300 ppb Zn). In addition, this mixed heavy metals waste had to be stabilized to meet the “third-third” EPA BDAT (Best Demonstrated Available Technology) regulations for land disposal. Ion exchange was first evaluated, but it could not meet the low ppb limits for all the metals and its regenerant required off-site stabilization at high cost. As a result, the Oberlin Filter technology was next evaluated since it could produce dry, stabilized cakes.  An extensive pilot testing program was conducted and finally, it was demonstrated that these limits could be achieved quite routinely. In addition, these low metals limits were obtained at a very high 3600 gfd flux; and the resultant “dry” cakes passed the TCLP test for all eight toxic metals (per EPA “thirdthird” regulations issued. As a consequence, the Oberlin Filter technology was selected and operating successfully.

Wastewater Mixed Metals Removal

This plant required stringent heavy metals removal to meet chronic aquatic toxicity criteria. A variety of technologies were evaluated, but the Oberlin Microfiltration technology provided the best overall metals removal of this waste as most removed to below detection limits. The resultant cakes passed the TCLP, which was also a big factor since other technologies required additional post-treatment to produce stabilized solids.


Explosives Plant Lead Removal from Wastewater 

This plant had sent their lead wastewater off-site for treatment and stabilization at considerable expense. They contacted Oberlin Filter for evaluations and the below table demonstrated complete feasibility as lead was removed to well below the proposed discharge limits and cakes passed TCLP at a reasonably high 2000 gfd flux. As a consequence, the Oberlin Filter was installed.

Chelated Copper Removal from Wastewater

This plant had two wastewater streams which required Cu removal to meet the 50 ppb toxic discharge limit as well as to protect the on-site biological waste treatment system. One stream contained chelated Cu (Case 1) while the other was chelated as well as heavily contaminated with organics (Case 2). Ion exchange and oxidation with iron were tried on Case I stream with little success while hot sodium sulfide precipitation was successfully demonstrated for Case 2 after the organics were removed. However, it was later found that complete organics removal could not be assured so the Oberlin Filter technology was evaluated on both streams. The below table shows that Cu removal to 10 ppb was obtained at high 4200 gfd flux (Case 1) and <200 ppb Cu at 300 gfd flux for Case 2. The higher — 200 ppb Cu in Case 2 was due to the copious — 50% organics present, but combined waste discharge was below 50 ppb. In addition both cakes passed TCLP and even organics were stabilized when an organic stabilizer (FOl) was used. Economics showed that Case 1 treatment costs amounted to low $ 1.60/1000 gallons while Case 2 about $130/1000 gallons, but Case 2 disposal cost savings amounted to about $1350/1000 gallons due to the high level of organics present that could be recovered and recycled. As a consequence, the Oberlin Filter was installed for the treatment process.

Wastewater Cleanup - Barium, Titanium, Neodymium, Bismuth and Lead

Sun Valley, California - This facility's manufacturing process produced two liquid waste streams containing a complex array of metal oxides and titanates. Elements with the highest concentration are barium, titanium, neodymium, bismuth and lead. The compositions of the two waste steams had lead and total suspended solids level typically range from 0.5 to 5.0 percent. The treatment objective was to reduce concentration of metals to meet to satisfy the Los Angeles sewer effluent limits of 5.0 ppm for soluble lead and 26.0 ppm total suspended solids. The effluent characteristics from the Oberlin microfiltration system were 0.2 to 0.4 ppm soluble lead and 5ppm total suspended solids. Well below the requirements of the Los Angeles sewer effluent limits with very low maintenance costs.

Cleaning Wastewater Slurry of Lead and Suspended Solids

Manati, Puerto Rico - Operations at the facility produce a wastewater slurry that contains 1,000-5,000 parts per million(ppm) of suspended calcinated or partly fused, high-lead content glass material and 2,000 to 10,000 ppm of total suspended solids. The objective of the facility was to have a filtration system that removed suspended particulates from the wastewater slurry ranging from .5 to 30 microns in size. The Oberlin microfiltration system removed nearly all particles from .5 to 30 microns in size.

Low Level Radioactive Water

Zinc, Lead, Aluminum, Copper and Uranium particles.  Levels of metals reduced to <0.1 ppm. Uranium levels reduced to <0.01 ppm.  Limits are 0.5 ppm.


Copper, Lead & Zinc Removal

Battery manufacturer wastewater removal of copper, lead and zinc. OFC reduce levels from as low as 400 ppm to as high >1000ppm to < 1ppm.  Lead <0.01 ppm.


Cadmium Sulfide

Solydra, California: Toxic metal removal –Sludge dewatering


Lead Removal

Explosives manufacturer lead containing wastewater treated and filtered removing lead from 110 ppm in feed to 0.3 ppm in clean discharge. Discharge limits were 5 ppm.


Cadmium and Tellurium

First Solar- Global: Remove glass fines from toxic metals recovery (cadmium and tellurium).  Feed water solids concentration was >300,000 mg/l.  Clean water quality discharged <26 mg/l



Industrial Wastewater Process Treatment

Oberlin Filter has extensive experience treating industrial wastewater and removing heavy metals. The filtered water will meet the wastewater discharge limits so that it can be disposed into the municipal sewers.  The filtered water is so clean that it can be recycled and reused within the plant.  The filtered heavy metals and solids will be dry and automatically discharge from the filter.  Uranium, aluminum, nickel, lead, zinc, copper, chromium, barium, titanium, neodymium, bismuth are some of the heavy metals we remove from water.


The Oberlin Filter technology allows industries to treat their wastewater on site. Our filtration systems provide low cost metals removal/stabilization in one simple operation. The Oberlin Filter technology is a highly effective way to treat wastewater at its source to reclaim the water and prevent pollution.  Please see below examples of the Oberlin Filter's ability to clean wastewater.


Chemical Plant Hazardous Wastewater Treatment

This application involved treatment of a high solids wastewater (WW) stream that was shipped off-site at considerable cost (i.e., >$2MM annually). The stream contained a fairly large amount of surfactant as well, which complicated the treatment and subsequent solids removal prior to discharge through a carbon bed-polishing step to the local river. Lab tests showed that by combining high charge cationic polymer along with powdered activated treatment, the WW could be effectively filtered and also reduce the load to the activated carbon beds prior to discharge to the local river. As a consequence, this treatment protocol was adopted along with an Oberlin Filter, and startup commenced in early 2004. Tests of filtrate showed that both Surfactant and Haz levels were well below 0.1 ppm.  The Oberlin Filter process for this very difficult wastewater has been operating successfully for almost 10 years.


Heavy Metal Wastewater Treatment

Electronics Manufacturing Plant Wastewater

This plant’s effluent exceeded the local sewer authority’s lead discharge limit. As a consequence, the plant was mandated to cease discharge and dispose of their wastewater in an off-site hazardous waste landfill at a $0.55/gallon cost. Two Oberlin Filters were installed and the dry cake feature significantly reduced waste volume. These units repaid their cost after three months of operation based on disposal cost savings alone. 


The below table details actual plant operation data and compares the Oberlin Filter's effluent with the plant’s discharge limits. As shown, these units reduced the effluent Total Suspended Solids (TSS) and lead levels to well below the plant’s required discharge limits at high 800 gfd flux rates. In addition, these units routinely achieved >50% solids dry cakes that could be disposed of in a RCRA-approved landfill (at significant cost savings compared to the concentrate from the crossflow microfilters). Subsequent evaluation of the aid/stabilization agent per the SITE technology actually improved flux and resulted in stabilized cakes (passed TCLP).

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