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When treating oily wastewater by floatation, dosing clay particles will increase the flotation efficiency.

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Suppose a certain kind of natural river is treated by coagulation and flocculation process in a reciprocating baffled flocculation tank. The water flow rate is 600 m3/h. Volume of the flocculation tank is 200 m3. There are 3 baffles in the flocculation tank. Assume that: the local headloss caused by all corners in the tank is 90% of the total headloss, and the local resistance coefficient of each corner is ζ=2.8. The average flow velocity in the corners is 0.2 m/s. Water temperature is 20 C. Water kinematic viscosity is ν=1.005×10-6 m2/s.Then, the average G is ___ s-1 (fill in an integer); The number of G is _ (choose in/out of) the reasonable range.

Suppose the removal efficiency of TOC in water by a certain active carbon (AC) obeys Freundlich adsorption isotherm. The equation is qe=k Ce^(1/n), where k=0.006, n=1.1. The unit of qe is mg/mg-AC, and that of Ce is mg/L. Now, pump solution with 20 mg/L TOC into an adsorption column filled with such AC continuously.(1) When the adsorption column is completely saturated, the maximum adsorption capacity of AC is _ mg/mg-AC. (2 decimal places shall be reserved for the result.)(2) After that, solution with TOC concentration increased to 40 mg/L is pump into the AC adsorption column, then, the column _ (choose can/cannot) still adsorb the TOC in water.

Suppose a RH-RNa ion-exchange softening system is applied to treat raw water with salt contents shown below.Ca2+：120 mg/L Mg2+：42 mg/L Na+：69 mg/L K+：19.5 mg/LHCO3-：427 mg/L SO42-：120 mg/L Cl-：124.25 mg/LIf the effluent basicity demand is 0.5 mmol/L, the proportion of water flowing into RH exchanger should be ______ _% of the total water flow.Please fill in an integer.

Suppose raw water is treated in a siphon filter. The water flow rate is Q=25000 m3/d. If the filtration velocity should be 10 m/h, the number of filter cells should be more than _ ;(Washing intensity is 15 L/(m2·s))and the corresponding area of each cell should be _ m2. Please fill in integers into the blanks.