You are given a task to design a water treatment plant for treating 30 000 m³/d water from screening up to the flocculation stage. This design cannot be resolved without in-depth engineering knowledge, particularly knowledge that supports engineering design in a practice area. Information needed for each stage as tabulated in Table 1 Table 1: Information for each stage Stage Information one steel bar coarse screen Screening Aeration cascade aerator, moderately polluted, stepped weir, ratio of oxygen deficit 2.26 Coagulation two square basins, depth is 3/4 the width, 30 seconds detention time, temperature 10 °C L:W:D is 1:4:2, temperature 15 °C Flocculation

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A contaminant is present in an industrial wastewater at a concentration of 268 mg/L and can be degraded according to a first-order reaction. Previous research has identified that K contaminant is regulated at 2.5 mg/L and must be removed prior to discharge to the sewer. 1. 5.2/hr. The a. Identify the required reaction time (in hours) to degrade the contaminant to the target effluent concentration of 2.5 mg/L in an ideal continuously-stirred tank reactor (CSTR). b. Identify the required reaction time (in hours) to degrade the contaminant to the target effluent concentration of 2.5 mg/L in an ideal plug flow reactor (PFR). If the wastewater flowrate is 7,000 gallons/day (gpd), identify the volume required (in gallons and ft') for ideal CSTR and PFR treatment system to achieve the target effluent concentration of 2.5 mg/L. d. Management would like to use two 500 gallon tanks operated as two-CSTRS in series to treat the wastewater at a flowrate of 7,000 (gpd). Will this be satisfactory for…

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This is for a water and wastewater review. It's not for a grade I just need to understand the problem, please include equations and  choose one of the answer choices.