SU0003122 - Laserfiche WebLink

Home Browse Search

i Y 2.3 Test Chronology The plant was installed under the direction of the manufacturer on October 1, 1992 and dosing, at the rate of 450 gpd, was started on October 2, 1992. After three weeks of start-up, sampling was started on October 26, 1992. The stress test sequence was started on February 15, 1993 and ended on April 7, 1993. The evaluation was completed on May 6, 1993. Freezing of the diverter valve, requiring application of heat tape for a one week period (March 15 - 22, 1993), was the only maintenance required during the test. " 3.0 ANALYTICAL RESULTS 3.1 Summary Chemical analysis of samples collected during the evaluation were completed using the procedures in Standard Methods for: the Examination of Water and Wastewater3, or U.S. Environmental Protection Agency procedures4. Copies,': of the data generated during the evaluation are included in Appendix C. The results of the chemical analyses and on-site observations and measurements made during the evaluation are summarized in Table I. Guidelines for evaluating the analytical results from the testing are described in Section 5.1 and Section H of Appendix A in NSF Standard 40. In completing the pass/fail determination on the data generated from the testing, ten percent (a total of twelve) of"the samples collected during testing (not to exceed one sample during stress testing) can be excluded from the pass/fail calculations. During testing of the Clearwater Model CWW450, no sample days were excluded 'from the pass/fail determinations. Section 2.9 and Section E of Appendix A of the Standard define influent wastewater characteristics as it applies to testing under the Standard. Typical domestic wastewater is defined as having a BOD, concentration between 100 and 300 mg/L and a suspended solids concentration between 100 and 350 mg/L. By the Program Specific Policies for Wastewater Treatment Devices and Related Products and Components (dated January 1, 1991): When the influent Biochemical Oxygen Demand and/or Suspended Solids fall outside the ranges specified in Section 2.9 of Standard 40, the effluent samples for the two calendar days immediately following the occurrence may be excluded in the 7 and 30 sample averages. The Policy does not require exclusion of data following a day with influent concentrations outside the defined ranges, but allows for discard should the influent strength have an apparent impact on plant performance. There were four sample days when the influent strength fell outside the specified range, but none were determined to Nave an,impact on plant performance. '1 4 " Draft Report