Research On Deep Phosphorus Removal Of Wastewater In Phosphate Mining Enterprises In The East Branch Of Huangbai River

Huangbai River is an important source of drinking water in Yichang City.The mineral resources in the basin are rich.It is one of the large-sized phosphate deposits in the country.There are many phosphate mining enterprises in the eastern branch of the basin and are densely distributed.In recent years,due to the excessive discharge of phosphorus from the phosphate rock production in the river basin,it has adversely affected the water quality and ecological environment of the river basin and endanger the health of the surrounding residents.It is urgent to carry out deep phosphorus removal from the source of pollution in the production wastewater of the phosphorite enterprises in the East Branch of Huangbai River Basin.In order to solve the problem of excess phosphorus in the effluent of phosphorite production in Huangbai River east branch basin,Heiliangshan mining area of Hubei Changda Chemical Co.,Ltd.was chosen as the site for the demonstration study.Through the screening of phosphorus removal agents and the related process conditions,Phosphorus mechanism of the study,to build efficient and economical chemical coagulation phosphorus removal system to deal with.The main findings are as follows:?1?The effects of five inorganic polymer coagulants,polyaluminum salts,polyferric salts and polyacrylamide,as well as organic polymer coagulants,on phosphorus removal from wastewater produced by phosphate rock mining enterprises with different concentrations were studied.The organic-inorganic complex coagulant PAM-PAC/PFS which is suitable and high efficiency and economical for the production of phosphorus removal from waste water by phosphate ore enterprises in Huangbai River East Branch Basin has been determined.?2?The optimum coagulation hydraulic conditions of the composite coagulant PAM-PAC/PFS were:fast stirring speed of 400 r·min^-1,time of 1 min;slow stirring speed of 100 r·min^-1,the time is 6 min;The optimum dosage of coagulant PAM is 1mg/L,and the best addition order is behind the inorganic coagulant PAC/PFS.The optimum sedimentation time is 20 min,the optimum pH value and temperature are6.5-13 and 8-50?,respectively.When the mine production effluent reaches the Grade I standard for comprehensive wastewater discharge and surface water level III after being treated by the composite coagulant,the dosage of the inorganic combination coagulant PAC/PFS?y,mg/L?and the initial total phosphorus concentration?x,mg/L?respectively satisfy the relationships of y=2.3753x+22.816?R²=0.9139?and y=3.8363x+36.012?R²=0.9816?respectively;The relationship between different initial total phosphorus concentrations?x,mg/L?and the amount of produced mud?y,g/L?satisfies y=0.0024x+0.0904?R²=0.9548?and y=0.0053x+0.0922?R²=0.9935?,respectively;The reagent cost required is less than 0.2 yuan/t and 0.3 yuan/t respectively.?3?The composite coagulant PAM-PAC/PFS phosphorus removal system has a very good phosphorus removal effect on the production wastewater of phosphate mine in Huangbai River East branch watershed,and it can greatly reduce the turbidity of the effluent.The relationship between the effluent total phosphorus concentration?y,mg/L?and the effluent turbidity?x,NTU?can meet the requirements of y=0.0363x+0.0747?R²=0.9013?.The total nitrogen,ammonia nitrogen,nitrate nitrogen and chemical oxygen demand have certain removal effects.The effluent pH has a certain improvement effect,which has good practical value and environmental benefits.?4?The technology of composite coagulant PAM-PAC/PFS was characterized by SEM,XRD and FT-IR.The mechanism of phosphorus removal was confirmed to include the compressive double layer,electrical neutralization,adsorption bridging and sweep coagulation four ways synergy.