Technical Advisory Group Meeting Florida Atlantic University Funded - PDF document

Technical Advisory Group Meeting Florida Atlantic University Funded by the Hinkley Center for Solid and Hazardous Waste Management (HCSHWM) DATE: Friday, January 30, 2015 TIME: 12:00 noon to 1:50 pm WHERE: CM Building (22), Room 130 (Studio 1) 777 Glades Road, Boca Raton, FL 33431 MEETING AGENDA 12:00 – 12:10 pm Opening Address and Introduction of Participants D. Meeroff 12:10 – 12:40 pm Leachate Collection System Clogging J. Dacey A. Harris D. Purdy 12:40 –1:10 pm Safe Discharge of Landfill Leachate to the Environment J. Lakner 1:10 –1:40 pm Groundwater Circulation Well Experiments A. Albasri 1:40 –1:50 pm Open Forum Participants 1:50 pm Adjourn, Thank You D. Meeroff Attendance: Denys Purdy, Justin Dacey, Alyssa Harris , Tim Vinson, Ahmed Albasri, Joseph Lakner, Dan Meeroff, Megan Matson, Bishow Nath Shaha, Lisandre Meyer, Jeff Roccapriore, Craig Ash, Richard Meyers, Ravi Kadambala, Ron Schultz, Owrang Kashef 1. Opening address by D. Meeroff followed by introduction of the group members and participants (12:05 pm) 2. J. Dacey gave a presentation on the Flowmark antiscaling system. Essentially, the device doubled the particulate calcium compared to upstream levels. Then he described the dilution system for scaling control and showed data to support the hypothesis that the compost industrial supply well’s groundwater improved the calcium carbonate precipitation potential of leachate as measured by the Langelier Saturation Index and the Ryznar Index. Then he described the upcoming flowmark side ‐ by ‐ side experiment. The first question was about the impact of the dilution and leachate flows vs. rainfall. Dr. Meeroff responded that this work is currently ongoing. Dr. Kadambala asked for details how the Flowmark system works, what pipe size, what other strategies did you test, what are the flows? J. Roccapriore asked about the pipe lengths, and revealed that Monarch Hill has experienced some calcium carbonate scaling in its leachate collection system, which has essentially no gravity lines because it is pumped to a force main directly from the hill. 3. A. Harris gave a presentation on her leachate aeration tests, crystal formation, and vibration table experiments. Then she showed her black sludge formation data. The stationary samples had much finer particles compared to the rotated and aerated samples that had larger agglomerated flocs. She showed micrographs of two different organisms growing in the sludge and then mentioned new experiments which contrast the effect of HDPE v. PP to see if there are surface charge interactions with the pipe material itself that promote rock formation. In addition, she plans to heat the leachate to see the effect of

temperature. Next she presented her results of the rubber ‐ like substance (“blob”). She tested loss on ignition (86%, which revealed a dominant organic content), bleach reaction (which revealed microorganisms growing on the surface), acid reaction (which revealed calcium carbonate effervescence), X ‐ ray diffraction (which revealed chloride salts of ammonium, sodium, and potassium), and X ‐ ray fluorescence (which revealed calcite). Next she presented her work on testing the cationic polymer Clarifloc used by the wastewater treatment plant that delivers biosolids to the landfill. It was hypothesized that the polymer may play a role in the blob formation. She tested the polymer with lime and crushed drywall, and was planning to test with leachate, ash, and biosolids too. J. Roccapriore mentioned that Waste Management does not experience any intensive clogging and operates an 8 ‐ inch forcemain flowing full with very few gravity lines in the system. They have never encountered any rubber ‐ like substance. Also they do not have a true ash monofill but do use ash for daily cover. He mentioned that Broward County operates an ash monofill and recommended to ask them if they experience anything like this. R. Meyers replied that he would be more than happy to supply leachate and ash samples for the experiments. C. Ash mentioned that Waste Management operates an ash monofill in Miami ‐ Dade but to his knowledge they do not experience any similar problems. Dr. Bloetscher asked about the pH acting in the opposite way as he would expect after aeration. Dr. Meeroff said that the observation was verified several times and is the basis of University of Florida doctoral candidate, Kevin Kohn’s dissertation on carbon dioxide stripping for scaling control. 4. J. Lakner presented his work on advanced oxidation of leachate from partially closed landfill leachates for beneficial reuse of this water as a resource. He presented water volumes and water quality data. Then he explained how the processes work, and then he presented pilot testing results. First he verified the reaction mechanism, performed a UV scan to determine the maximum absorbance, then he ran tests to determine the effect of catalyst aids, but none of the metals tested performed better than UV/TiO 2 , and only zinc did not inhibit the reaction. Then he showed results using different lamps and reactor configurations. Comparing the lamp power of the two types of lamps in different wavelength regimes, they were found to have similar output. The flow through reactor configuration has about 20x more power density and reaction detention time compared to the falling film reactor but light penetration is an issue. Next he presented preliminary results from the critical orifice advanced oxidation unit. With diluted leachate, the unit increased alkalinity, decreased pH, removed 70% of COD in just 20 minutes, but increased TDS. It was recommended to test the unit as a pretreatment or polishing step to photocatalytic oxidation. J. Roccapriore asked if the fixed volume tested in 8 hours could be scaled up to help offset the surcharge to a wastewater treatment plant. Safe discharge for onsite use is the goal of this project to be able to use for irrigation for dust control is an option at Monarch Hill. Previous work done by F. Youngman determined 44 hours treatment required for Monarch Hill leachate to meet the COD limit. At 24 hours detention, the process is cost effective, so the goal is to reduce the time required for treatment. C. Ash commented that this is a big concern for 50,000 ‐ 100,000 gallons per day of leachate generated at these large facilities. More disposal options are needed. Dr. Bloetscher mentioned the orifice process increased the pH and alkalinity after superoxide formation in the microbubbles. This needs to be investigated and experiments are being prepared. T. Vinson asked for clarification on the purpose of the absorbance tests, and J. Lakner described that the flow through experiments do not create a thin film, so UV light penetration is important because of the 2 ‐ inch thick bulk solution. So this is why those absorbance tests tried to quantify the light penetration or shadow effect of titanium dioxide dose. Dr. Kadambala mentioned previous research conducted at UF on R/O pretreatment strategies for leachate recirculation. T. Vinson mentioned that Tim Townsend could provide these results. C. Ash mentioned that the Medley Landfill uses a biological pretreatment process primarily for ammonia removal and arsenic, but the facility is now going to deepwell injection. 5. A. Albasri presented his fourth phase of work on iron removal from the subsurface using groundwater circulation well technology. He is now using a 32 ‐ gallon model with 3 monitoring wells to measure the

radius of influence. He loaded the system for several months to create a spiked 10 ‐ 50 mg/L iron groundwater/soil. On 01/19/2015, he turned on the GCW system and as of 01/22/2015, no removal of iron has been found yet. Three days’ worth of results is not enough to show any trend. Albasri is worried about ferric iron plugging the system. Dr. Bloetscher pointed out that bleach will control iron bacteria plugging. T. Vinson recommended that in the real world, you would just drill more wells and then he mentioned some work from UF regarding interceptor trenches with media. Dr. Bloetscher mentioned that wells will clog with iron bacteria and sloughing will create clogging in the subsurface and recommended to periodically use some sort of filtration (sand separator), which is what is used in municipal supply wells. 6. Dr. Meeroff thanked all of the participants, and the meeting was adjourned at 1:50 pm.

Laboratories for Engineered Environmental Solutions Agenda 1. Introductions/Opening Remarks Dr. Meeroff Technical Advisory Group Meeting 2. Evaluation of Leachate Clogging Dacey/Harris 1. “Sustainable Management of Pollutants Underneath 3. Photocatalytic Oxidation Studies Lakner Landfills” 2. “Onsite Treatment of Leachate Using Energized 4. Circulation Well Experiments Processes” Albasri Daniel E. Meeroff, Ph.D. 5. User Input/Open Forum Everyone Department of Civil, Environmental & Geomatics Engineering Technical Advisory Group Meeting Technical Advisory Group Meeting FAU ▪ January 30, 2015 FAU ▪ January 30, 2015 Current Projects • "Critical Examination of Leachate Collection http://labees.civil.fau.edu/leachate Systems Clogging at SWA Disposal Facilities" • "Safe Discharge of Landfill Leachate to the Environment" • "Sustainable Management of Pollutants Underneath Landfills" • "Assessing Options for On-site Leachate and Groundwater Management Strategies at Florida Landfills“ • "Investigation of Effective Odor Control Strategies" Technical Advisory Group Meeting Technical Advisory Group Meeting FAU ▪ January 30, 2015 FAU ▪ January 30, 2015 “Critical Examination of Introductions Leachate Collection System Clogging” Technical Advisory Group Meeting Technical Advisory Group Meeting FAU ▪ January 30, 2015 FAU ▪ January 30, 2015 1