Abstract: | According to tracer tests, six kinds of horizontal subsurface flow constructed wetlands with different inflow configuration(i.e. common push flow, more direction inflow, part circumfluence, wave flow, diagonal flow, more point inflow) have different hydraulic residence time distribution density curve. Among four kinds of probability distribution functions(i.e. normal distribution, logarithm normal distribution, chi-square distribution, rayleigh distribution), the logarithm normal distribution function has better fit results. According to simulation results on tracer concentration of six kinds of horizontal subsurface flow constructed wetlands with different inflow configuration, the completely stirred tank reactor model(CSTRM) is better to fit part circumfluence inflow configuration, the dispersion and plug flow model(DPFM) is better to fit other five kinds of inflow configuration. Considering tracer concentration folding of more direction inflow and more point inflow constructed wetlands, this study discovers that the dual DPFM is better to simulate their tracer movement in horizontal subsurface flow constructed wetlands. |