Research On The Disposal Of Tail Water From Sewage Treatment Plants In The Industrial Park By Constructed Rapid Infiltration System

In this paper, the mixed waste water and tail water from a chemical industrypark in Hefei has been employed to conduct the sewage treatment process by meansof constructed rapid infiltration, and it studies the feasibility of decontamination bythe constructed rapid infiltration, the influencing factors on the system stability, thefate mechanism of pollutant degradation as well as the system dynamics modelwhich can reflect the decontamination of CRI, thus the experimental resultsdemonstrate that:When dealing with the industrial sewage with the help of constructed rapidinfiltration biofilter, the inflow of COD has been steady at100mg/L approximately,the experimental CRI system shows a good ability of decontamination in the stageof feasibility study, and the average decontamination rate of COD reaches up to62.87%, the decontamination rate of total nitrogen also comes up to51.78%; whenthe wet to dry weight ratio is1:5, the removal effect for CODCr, ammonia nitrogenand total nitrogen is optimum and economically feasible. The impact of hydraulicloading variation on the removal effect for CODCris not significant, and the effectof decontamination will be better when it is1.5m/d. The experimental research onthe mechanism of decontamination in the system shows that both of biological andabiological mechanism play a major role in the decontamination system, in contrast,the effect of biological mechanism will be more significant, the removal rate ofabiological mechanism for organic matter takes up15.6%of the total removal rate,while the proportion is84.4%for the biological mechanism.The linear and exponential models have been built up with the help ofhypothesis, and the decontamination situation of system can be known by theverification model for experimental data. According to the test data, the linearmodel and the exponential model of COD are respectively obtained as the follows:Ln(Co/C)=0.0018H，C/Co=0.9614e-0.8588x; the model of ammonia nitrogen isLn(Co/C)=0.0104H+2.0784and C/Co=0.9996e-2.7238x; moreover, the linear modelof orthophosphate decontamination is Ln(Co/C)=0.0017H, while its exponentialmodel is C/Co=0.9537e-0.7904x, all of the numerical models successfully show thetrend curve of experimental data except the linear model of ammonia nitrogendecontamination, it is can be known that the exponential model is superior to thelinear model through the comparative study.