| With the unprecedented development and improvement of the quality of our country's economy and people's lives,the scale of urbanization is also expanding,and the number of domestic sewage is increasing.Too much of untreated wastewater were discharged into the nature water,which brought huge pollution loads to the urban river,resulting in deterioration of the river water quality,appearing seasonal or year-round black odor phenomenon.To eliminate the black and Odorous River and improve the urban river environment has become one of the most important concerns at present.It is of great importance to promote the development of social economy and improve the quality of life and health of urban residents.Phosphorus is not only the main influencing factor of water black and odor,but also the main nutrient element of the secondary disaster of eutrophication in the city.So,this paper studies the effect of phosphorus and calcium phosphorus product of calcium peroxide in different conditions were studied,on the basis of this,by taking Anhui Polytechnic University Campus River as the research object,the research of calcium peroxide in closed condition,the effect on water purification of the black odor river.The results of the study are as follows:1)had effect on phosphorus removal of calcium oxide,with the increase of calcium peroxide dosage,increased first and then gradually stabilized;by controlling the reaction time can be found,the phosphate removal efficiency and is positively correlated with reaction time,reaction 480 min,the removal efficiency of phosphate removal temperature gradually stabilized;the calcium peroxide associated with phosphate concentration,the temperature of 25 ?,orthophosphate removal effect is positively related to the initial concentration of phosphorus and water,low concentration,the higher the temperature the better removal effect;the effect of p H on phosphorus removal effect is very large,when the initial p H is neutral,and had the best effect on phosphorus removal the lower or higher p H were not the best;by controlling the reaction process of p H,the higher the better removal effect of alkaline calcium peroxide.It is found that the final product of calcium peroxide and orthophosphate is tricalcium phosphate by the characterization of the reaction products.2)the test shows that calcium peroxide has a strong removal effect on the phosphorus in the black and smelly water body.The influence of each factor is the same as that in the previous experiment.The dosage of calcium peroxide is over 2g/L,and the reaction time is more than 24 hours.The phosphorus removal efficiency of water sample is no longer increasing.The effect of temperature on the removal of phosphorus from calcium peroxide is affected by dosage.When the initial p H is 12,the removal efficiency of phosphate and total phosphorus is the highest,which is 96.25% and 83.5%,respectively.3)validation test also showed that the concentration of dissolved oxygen(DO)in black odor water sample was proportional to the dosage of calcium peroxide,and the removal efficiency of total nitrogen and ammonia nitrogen increased first and then stabilized with the increase of calcium peroxide dosage.When the dosage is 2g/L,total nitrogen and ammonia nitrogen removal efficiency reached the maximum,but the increase of DO concentration was relatively slow.By the static reaction time control,found the static 1h,black smelly water DO was the highest,then small changes;total nitrogen and ammonia nitrogen removal efficiency and incubation time was positively related to the static 2D,ammonia removal efficiency reached the highest removal efficiency of the static 3D of total nitrogen;by adjusting the p H found that DO was negatively correlated with p H black odor in water;increasing the initial p H can enhance the removal efficiency on total nitrogen and ammonia black odor in water,when the initial p H was 12,the removal efficiency of total nitrogen and ammonia nitrogen reached 27.14% and 25.00% respectively. |
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