06-I Water Production Study - Laserfiche WebLink

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combinations of polymers/coagulants. The coagulant type and dosage rated were changed bazed on the chemical testing program. 'Ihe plant developed an operating procedure which adjusted the variable speed flocculators based on water chazacteristics and the developed "operating matrix". Every operating shift had the responsibility and authority to ma}:e the necessary operational adjustments. The filters were evaluated on an individual filter basis and a unique dovm ramping rime for each filtec was developed. Figure 16 gives a typical filter post-bac},-wazh turbidity profile. To sumrnarize the operational modifications for the optimization program chey consisted of: (1) Chemical additives evaluarion program. N (2) Development of an "operating mahix" for chemical addition and changing water quality. (3) Development of individual filter profiles and operating procedures for each unique individual filter. (4) Empowering all operating shifts with the responsibility and authority to make the necessary operarional adjustments. . M. FINDINGS A. Sedimentation Basin Performance The Texas Optimizarion Program's performance goals for sedimentarion basin performance is that all of the turbidiry readings from each basin be less than or equal to 2.0 NTUs. This is not a recognirion criteria for the pro,am> but is a reportin, reqwremenG Plantr must collect turbidity samples at least once each day from the efiluent of each sedimentation basin. These samples must be collected with the basin in operation. The plant may collect settled water hubidiry data more frequently than once each day, i.e., once each'shift or once every four hours. However, the sampling should occur at the same rate throughout the month and at regular intervals when the basin is operating. The program monthly operating report allows counting the number of turbidity readings above 2.0 NTU and the number above 5.0 NTU rounded to ihe nearest 0.1 NTUs, and allows for rounding of the percentage above 2.0 NTU to the neazest 0.1 percent The monthly operating repoR also requires reporting ofmaximumNNs and miniinum NNs for settled water. (4) Figure 12 presents a graphical plot of the settled water turbidity during the recogution period and Figure 13 depicts the percent frequency of occurrence of NTU values. As depicted from the graphs, the plant maintained about 80 percent of the performance goal limit of 2.0 NT[Js.