Читать книгу Statistics and Probability with Applications for Engineers and Scientists Using MINITAB, R and JMP - Bhisham C. Gupta, Irwin Guttman - Страница 18

What are good operating conditions? Initially, it was believed they were those resulting in the highest possible removal of solids. Referring to Figures 1.1.1b and 1.1.2a, settleable solids in the influent are denoted by and the settleable solids in the effluent by . The percent solids removed by the screen is therefore . Thus, initially, it was believed that good operation meant achieving a high value for y. However, it became evident after the first set of experiments were made, that the percentage of the flow retreated (flow returned to treatment plant), which we denote by z, also had to be taken into account. Referring to Figures 1.1.1b and 1.1.2a, influent flow to the screens is denoted by and effluent flow from the screens to the river by . Thus,

Figure 1.1.2 Original version of the screening unit (a) detailed diagram and (b) simplified diagram.