SU0003122 - Laserfiche WebLink

Home Browse Search

i After a three week start up period, the plant is subjected to the'following loading sequence: I Design loading - 16 weeks y Stress loading - 7 weeks _... Design loading - 3 weeks During the design loading periods, 24-hour composite samples are collected of-the influent and _�effluent_fiv_e_times per.week.'The samples are analyzed for BODS, suspended solids and volatile suspended solids. On-site determinations of the effluent temperature, pH and dissolved`oxygen are also made five times per week. In plant measurements of.aeration chamber temperature, pH, dissolved oxygen and aeration chamber suspended .solids are also made five times per weak. i Stress testing is designed to evaluate* how the -plant"performs under non-ideal"conditions, including high and.low hydraulic loadings and electrical orIsystem failure... The test sequence j includes (1) Wash Day stress, (2) Working=Parent stress, (3) Power Failure stress, and (4) Vacation stress. Detailed descriptions of the stress sequences are shown.in Appendix B. During the stress test sequence; 24 hour composite samples are.'collected'before and for seven days after each stress dosing pattern. The analyses and on-site determinations completed on the samples are the same as described for the design load testing. Additional samples are collected during the Wash Day and Working Parent stresses for informational purposes only and are not i included in the pass/fail calculations: These-samples include two samples collected during the Wash Day stress, two during the Working Parent stress, one samples collected immediately after. the power.is renewed to the plant during the Power Failure stress and}one collected with the start of dosing in the Vacation stress. j k , In order for the plant to achieve Class I effluent; it is required to produce an effluent which meets i the EPA.guidelines for secondary effluent discharge2: . BODS and Suspended Solids: (a),the arithmetic mean of all effluent samples collected in a period of 30 consecutive sample days must be 30 mg/L, with>_ ' 85 percent removal; and (b) the arithmetic mean of all effluent samples collected, in a 7 consecutive sample day period must be <_ 45.mg/L; pH: Effluent values remain between 6.0 and 9.0. Requirements are also specified for effluent color, odor,oily film and foam,:as well as maximum noise levels allowed from the plant. In determining if the plant meets the effluent requirements, ten percent of the samples during the testing, not to exceed one sample during stress testing,'may be excluded from the pass/fail determination. A minimum of 118 sample days, 23 during the stress test sequence, must be collected and analyzed for the test to"be valid. 3 Draft Report