ARCHIVED REPORTS_RPTS - Laserfiche WebLink

Home Browse Search

Section 9.5.1.1 of the Standard provides guidance addressing the impact of unusual testing conditions, including sampling, dosing, or influent characteristics, on operation of a system under test. Specific data ned to have an points may be excluded from 7- and 30 - day avale9the exclons where usion on to be documented ed in the final verse report. impact on performance of the system, with rationale There were no such conditions during this test. Sections 3.6 and 9.2.1 of the Standard defines influent wastewater characteristics as they apply to testing under the Standard. Typical domestic wastewater is defined as having a CBOD5 concentration between 100 and 300 mg/L and a suspended solids concentration between 100 and 350 mg/L. The influent strength remained within the specified range, with the exception of Months 2 and 5. During Month 2, the 30-day average influent total suspended solids was 570 mg/L and during Month 5, the average influent CBODS concentration was 92 mg/L. Following section 9.5.1.1 of the Standard, NSF made an assessment of the impact of the influent strength on the treatment system for months 2 and 5. NSF determined that the dosing strength did not adversely affect the treatment process due to the relatively consistent effluent quality during those periods. Effluent total suspended solids averaged 6 mg/L during month 2 and 5 mg/L for the entire test. Effluent CBOD averaged 3 mg/L during month 5 and 4 mg/L for the entire test. The overall influent strength for the test was 291 mg/L for total suspended solids and 162 mg1L for CBOD. 3.2 Carbonaceous Biochemical Oxygen Demand The carbonaceous five day biochemical oxygen demand (CBOD5) analyses were completed using the EPA Method 405.1. The results of the analyses completed on the samples collected during the testing are shown in Figure 1. Influent CBOD,: The influent CBODS ranged from 40 to 550 mg/L during the evaluation, with an average concentration of 162 mg/L and a median concentration of 130 mg/L. Effluent CBOD5: The effluent CBODS concentrations ranged from <2 to 25 mg/L over the course of the evaluation, with an average concentration of 5 mg/L. The median effluent CBOD5 concentration was 3 mg/L. The Standard requires that the effluent CBOD5 not exceed 40 mg/L on a 7-day average or 25 mg/L on a 30- day average. Table II shows the 7 and 30 day average effluent CBOD concentrations and the 30-day average influent CBOD5 concentrations. The 7-day average effluent CBOD5 ranged from 2 to 14 mg/L. The 30-day average ranged from 3 to 8 mg/L. As shown in Table 11, the AdvanTex AX20N met the requirements of Standard 40 for effluent CBOD, / 01111120151060 This report may not be reproduced in whole or in part Rage 10 of 46 Final Report without the expressed written consent of NSF International. April 2002