Laserfiche WebLink
collected and stored prior to testing. Samples were collected when the leachate <br />feed rate was 25 gpm and the UV transmittance was recorded at its low valve of <br />44%. Samples were stored in 5 -gallon containers. <br />A 1000 mg/L of stock solution was prepared using commercially available <br />liquid bleach as a chlorine source. All the glassware was cleaned prior to use. <br />The initial UV transmittance was recorded using the spectrophotometer. A <br />known volume of stock chlorine solution for each desired chlorine dose was <br />pipetted into a 1 -liter (L) sample of the wastewater. The solution was mixed for <br />30 seconds before being filtered through a glass fiber filter. The UV <br />transmittance was evaluated on the filtered effluent sample. Results of the <br />chlorination testing are discussed in section 3. <br />B. Pilot Study Procedure and Schedule <br />The pilot study was started by slowly introducing the leachate to the WWTF. In the <br />beginning, the leachate was fed at 6.7 gpm for two days to acclimate the existing <br />microorganisms in the aeration basins. After no adverse effects were observed the <br />leachate feed rate was doubled. The leachate feed rate was incrementally increased to <br />25 gpm over the period of first month of running the pilot study. <br />Over the period of next twenty -plus days of pilot study, the leachate feed rate was <br />decreased to 15 gpm and increased back to 25 gpm. The leachate feed rate had to be <br />decreased due to unavailability of the leachate. The pumps were continuously <br />monitored and adjusted during the duration of the pilot study. <br />A temporary chemical seed system, for chlorination and dechlorination, was provided <br />as a standby disinfection system. This system was needed to meet effluent <br />disinfection requirements in the event of UV disinfection system was not working <br />properly due to leachate color in the wastewater. <br />The primary pump began feeding leachate into the WWTF on September 26, 2016 <br />and the study continued till November 18, 2016. <br />Prepared by: Bolton & Menk, Inc. Experimental Set -Up <br />Waste Management/Elk River Leachate Pilot Study I T21.109643 Page 7 <br />