Study On The Removal Performance Of Modified Zirconium Hydroxide For Low Concentration Phosphate In Water

Phosphorus is one of the limiting factors that cause eutrophication of water bodies.Excessive phosphorus causes damage to the balance of lakes,reservoirs and other ecosystems.The traditional water treatment technology is always difficult to achieve excellent removal effect when treating low-concentration phosphorus-containing wastewater and surface water bodies,and the adsorption method can not only stabilize low-concentration phosphorus,but also recycle phosphorus in water.However,the adsorption and dephosphorization materials developed and prepared in the laboratory are generally difficult for industrial mass production and cannot be used in large-scale practical engineering applications.Therefore,the search for adsorption materials that can be industrially mass-produced and have high efficiency and stability can be applied to actual water treatment projects by optimizing operating parameters,which has become the research focus and difficulty of adsorption and dephosphorization.In this paper,by modifying the zirconium hydroxide adsorption dephosphorization material,a zirconium hydroxide particle that can be used for industrial mass production,recycling and recycling is developed.By optimizing the material adsorption and dephosphorization process parameters,the material is used in actual water.The treatment engineering application has excellent continuous phosphorus removal capacity and recovery utilization rate,which provides theoretical support for the engineering application of adsorption phosphorus removal materials.The main research contents of this article include: using analytical grade and industrial grade zirconium hydroxide powder adsorbent material to carry out the sequential batch type low concentration phosphorus-containing wastewater treatment experiment to obtain the basic parameters of the phosphorus removal performance of the adsorbent material;After modification,zirconium hydroxide particles that can be mass-produced in industry are prepared,and sequential batch and continuous flow experiments are carried out to obtain the performance parameters of adsorption and dephosphorization of the material.The main research results of this article are as follows:(1)In the sequential batch experiment of analytical pure and industrial grade zirconium hydroxide powder and self-made zirconium hydroxide particles,the performance parameters of the material for adsorption and dephosphorization of 0.5mg /L low-concentration phosphorus-containing wastewater are basically the same.Phosphorus removal rate increases as the amount of adsorbent added increases;when the p H is between 6-9 and the water temperature is between 25℃-55℃,the material’s phosphorus removal effect is less affected by the solution p H and temperature,and the water is low The concentration of coexisting anions basically has no effect on the adsorption performance of the material.Comprehensive consideration of adsorption removal rate,desorption rate and economic benefits,the optimal adsorption time of powder and granular zirconium hydroxide is 5 ～ 20 min and 20 ～ 50 min,respectively,and the optimal concentration of desorption lye is 1.0mol / L ～ 2.0 mol / L,the optimal desorption time is 10 ～ 30 min and 30 min respectively.(2)In the experiment of continuous flow adsorption column of zirconium hydroxide particles,the influent concentration is 0.5mg / L,and the effluent concentration is controlled below 0.3mg / L.The greater the hydraulic retention time,the longer the running time;when the effluent exceeds the standard,the adsorption The material is regenerated by desorption.The greater the concentration of the selected desorption liquid,the higher the desorption rate.Considering the operation time,water treatment capacity,phosphorus accumulation,desorption rate and economic benefits of the adsorption column comprehensively,for 0.5mg / L phosphorus-containing wastewater,the optimal hydraulic retention time of the continuous flow adsorption column of zirconium hydroxide particles is 10 min,the most The alkali concentration of the good desorption solution is 2.0mol / L.(3)In the experiment of continuous flow adsorption column of zirconium hydroxide particles,the influent concentration is 0.5mg / L and the effluent concentration is controlled below 0.3mg / L.After continuous adsorption-desorption for 6 times,the cumulative running time is 701 h,and the material processing capacity is only Decreased by 4.96%;under the condition of low concentration of coexisting anions,after 6consecutive adsorption-desorption cycles,the cumulative operating time was 694.5h,and the processing capacity of the material was only reduced by 4.23%;Lake)The actual phosphorus-containing surface water of the lake water in the reservoir area,after continuous adsorption-desorption for 6 times,the cumulative running time is 569 h,and the processing capacity of the material is only reduced by 5.48%.The zirconium hydroxide particulate adsorbent has good chemical stability and recycling performance for the treatment of low-concentration phosphorus-containing water bodies.(4)When treating zirconium hydroxide particulate adsorbent with 0.5mg / L of phosphorus-containing water,the cost per ton of water treatment agent for the continuous flow adsorption column experiment is 0.79 yuan / m3;the investment per ton of water for the adsorbent in practical engineering applications is 354.5 yuan / m3 The cost per ton of water treatment chemicals is 0.483 yuan / m3.Zirconium hydroxide particulate adsorbent has excellent economic benefits in the process of deep phosphorus removal.