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F _ Secondary treatment is accomplished in two equal volume 250 gallon chambers. The first add`'second aeration chambers are continuously mixed and aerated by compressed air forced through a submerged rubbersleeve-type medium bubble diffuser anchored at the bottom of each tank. Each tank also contains floating plastic media which move with the mixing liquid. A thin biofilm (attached bacteria) forms on the surface of the plastic media, with more biofilm characteristically visible in the first aeration chamber than in the second aeration chamber. A significant suspended growth population was also observed during testing. Liquid and suspended solids pass between the two aeration chambers.through an opening in the bottom of the baffle separating the chambers. Hydraulic retention time in the aerated chambers is 20`116urs sit tf* rated capacity. Liquid from the aerationchambers passes through to the secondary dariffer chamb®r. This chamber is configured as an upflow clarifier.with a submerged weir(i.e.liquid enters'at the bottom of the chamber and flows upward to the weir iodated just below the surface of the chamber);. Effluent flows into the secondary clarifier chamber through an opening in the bottom of the:baffle separating It from the second aeration chamber. An:insert in the clarifier provide minimum sidewalfakope of-60 degrees tt minimize solids buildup on the sides of the chamber. The secondary clarifier has a working capacity of 220 gallons. Approximately 1200 US gallons per day of settled sludge and liquid is pumped back to the primary clarification chamber. The pumping rate is about 75 gpm, and the recirculation pump operates for 40 seconds every hour. This pumped flow.provides secondary sludge:wasting. Following testing, the°pump recirculation cycle was changed to operata in for: .%second pumpout cycles every hour: This deslgr�modification was reviewed and approved by NSF,and is detailed lin Appendix D. Effluent from the secondary clarifier chamber flows from the submersed wait',ftoigh a dissolving type solid tablet chlorinator, and into an effluent storage chamber. This effluent storage chamber serves both as a chlorine contact ,tank and an, effluent pump-.xeservolr. ' The punV contact tank has a opacity df approximately 320 gallons. Art effluent pump,is installed In:. ,chsmbW for disposal field dosing'. Disinfecdon is not apart of Standard 40. No samples wer6 collected tover disinfection on the tested system. Settled primary and secondary.sludge is pumped once a week:from the primary dai'iflt;ation'chamber to a thermal processor which is located in a riser,above the primary clarifier. Thee punVbd sludge is first dewatered by gravity drainage nd the drained-liquid is returned back to the prhory clarification chamber. After draining, the thermal processoremploys a,controlled thermal decomposition process to dehydrate, pyrolyze and gasify the sludge. Combustion air is provided by the compressor.:,Exhaust gasses from the thermal processor are vented to the atmosphere. Ash from the thermal decomposition process is flushed out the next time the thermal processor is filled with sludge. The thermal decomposition process takes approximately 10 hours. Following testing the plant was modified to'Wht-the exhaust from the thermal` processor through the primary clarifier. This design modification was reviewed and approved by NSF and is detailed in Appendix D. 2.2 Test Protocol > Section 9 of ANSI/IVSI*,Standard 40 protocol, "Performance Testing and "Evaluation', ls"induded in 5 Appendix.B. Start up.of the plardwwas accomplished by filling the.plant with 713 waterand1hen 1/3 raw- sewage. The plant,was.#. w.dosed at,":design. loading rate of 600 gpd over throe dosing periods as follows: f; 99/'ttil2015JOBDThis report May not be reproduced in whole or in part Page 8 of 49'J Final Report without theexpre"ed written consent of NSF International:. April 2000