Treatment efficiencies of a pilot scale constructed wetland treating greywater
from a staff canteen of the University of Moratuwa was studied to estimate the
temperature dependent reaction rate constants of specific pollutant removal
mechanisms.
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Parameter Estimation of Pollutant Removal for Subsurface Horizontal Flow Constructed Wetlands Treating Greywater
1. PARAMETER ESTIMATION OF THE POLLUTANT REMOVAL MECHANISMS OF SUBSURFACE HORIZONTAL FLOW CONSTRUCTED WETLANDS TREATING GREYWATER Dr. Shiromi Karunarathne MKBS Wijesiri VM Jayasooriya
11. DESIGN OF SHF CW SAMPLING POINT 01 SAMPLING POINT 04 SAMPLING POINT 03 SAMPLING POINT 02
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14. Assuming first order kinetics prevail, ( C e / C i ) = e -K T t C a = C e {(1- e -K T t ) / e -K T t } .………....….. (2) Where; K T – temperature dependent reaction rate constant t – retention time Then differentiate the equation (2) w.r.t. K T and simplify the equation; d(C e )/ d(K T ) = - tC e …...………...….... (3)
15. Effective sizing of the constructed wetland Then differentiate the equation (2) w.r.t. t and simplify the equation; d(C e )/d(t) = -K T C e ………………….... (4) Maximum retention time is taken that would yield satisfactory levels of treatment, Q = V/t max …………….......................... (5) A = Q.t max /d …………......................... (6) Then, resized surface area can be calculated using above equations.