Based On The Study Of Several Factors Affecting The Removal Effect Of Total Phosphorus And Ammonia Nitrogen In Black And Smelly Water

The black and odorous water body not only causes people’s resentment and nausea from the senses,but also endangers the health of human beings and seriously damages people’s living environment.The constructed wetland has a good removal effect on the content of TP and NH₄⁺-N in the sewage,but the content of TP in the black and odorous water is large.When the water is directly used as the artificial wetland,the plants in the wetland cannot survive,which seriously affects the treatment of the constructed wetland.ability.The flocculation and sedimentation process has a good removal effect on TP in black odorous water.Therefore,the removal of TP and NH₄⁺-N in black odorous water can be pretreated by flocculation and sedimentation process,and then treated by artificial wetland.The removal efficiency of TP and NH₄⁺-N in black odor water by two processes is affected by various factors such as temperature,pH and influent concentration.The relationship between the removal effect of pollutants and the main influencing factors is determined,which can be black odorous water.Processing provides a basis for the parameters.In this paper,the flocculation and sedimentation experiments under different conditions of temperature,drug dosage and precipitation time were used to study the relationship between TP removal effect and several factors in flocculation precipitation pretreatment process,through different hydraulic retention time,influent concentration and pH conditions.Under the artificial wetland experiment,the relationship between TP,NH₄⁺-N and various factors in the secondary treatment process of constructed wetland was studied.Experimental results show:（1）In the flocculation sedimentation experiment,PAC has better flocculation effect with ferric chloride,PAM and zeolite powder have coagulation effect,and the coagulation effect of PAM is better than that of zeolite powder.The optimal dosage of PAC is 0.25g/L;when the dosage of PAC is 0.15g/L,the optimal dosage of PAM is2.5mg/L,and the optimal dosage of zeolite powder is 30mg/L.When ferric chloride was separately administered,the optimum dosage of ferric chloride was selected to be0.08 g/L.（2）When PAC is used as flocculant and PAM is used as coagulant,the increase of PAC dosage has an increasing influence on the final removal rate of TP with the increase of temperature.The increase of PAM dosage is the final removal of TP.The impact of the rate is getting smaller and smaller.The mixed use of PAC and PAM is better than the addition of PAC.（3）When PAC is used as flocculant and zeolite powder is used as coagulant,zeolite powder has better coagulation effect under low temperature conditions.With the increase of temperature,the increase of PAC dosage has an increasing influence on the final removal rate of TP.The increase of PAM dosage has less and less influence on the final removal rate of TP.（4）When ferric chloride is used as a flocculant,when PAM is used as a coagulant,the effect of PAM on the precipitation rate is smaller than when PAC is used as a flocculant.Under different temperature conditions,the effect of increasing the dosage of 0.02 g/L ferric chloride is much greater than the effect of increasing the dosage of 0.5 mg/L PAM on the final removal rate of TP.（5）When ferric chloride is used as a flocculant,when the zeolite powder is used as a coagulant,the removal rate of TP in each group increases with the increase of temperature,and the coagulation of zeolite powder under different temperature conditions The effect is not good.The addition of 0.02 g/L ferric chloride is much greater than the effect of increasing the amount of 10 mg/L zeolite powder on the final removal rate of TP.（6）When NH₄⁺-N is removed from the sewage by artificial wetland,the optimal hydraulic retention time is 18 hours,and the NH₄⁺-N removal rate increases with the increase of hydraulic retention time.When the hydraulic retention time is more than18 hours,NH₄⁺-N The removal rate of N can reach more than 70%,and the growth rate of NH₄⁺-N removal rate becomes slower.When the hydraulic retention time is 18hours,the removal rate of NH₄⁺-N decreases with the increase of influent concentration.When the influent NH₄⁺-N concentration is 12 mg/L,the removal effect of NH₄⁺-N by constructed wetland is better.When the pH is increased from 6.0 to 8.0,the NH₄⁺-N removal rate first increased and then decreased.When the influent NH₄⁺-N concentration is 18 mg/L and the hydraulic retention time is 18 hours,when the pH is 6.5,the removal rate of NH₄⁺-N reaches a maximum of 74.26%,and the optimum pH is 6.5.The order of influence of various influencing factors on the removal rate of NH₄⁺-N in wastewater is:hydraulic retention time>influent concentration>pH.（7）When TP was removed from the sewage by artificial wetland,the TP removal rate increased with the increase of hydraulic retention time.The optimal hydraulic retention time was 24 hours.At this time,the TP removal rate is the highest,which was 67.20%.Under the optimal hydraulic retention time,the removal rate of TP increased with the increase of influent TP concentration.When the influent TP concentration was 0.55 mg/L,the TP removal rate is the highest,which is 57.4%.When the influent TP concentration is 0.55 mg/L and the hydraulic retention time is24 hours,when the pH increases from 6.0 to 8.0,the TP removal rate changes first and then decreases.When the pH is 7.0,TP The removal rate reached a maximum of57.17%,so the optimum pH was 7.0.The order of influence of various influencing factors on the removal rate of NH₄⁺-N in wastewater is:hydraulic retention time>influent concentration>pH.