Engineering Design Of A Stibium Wastewater Treatment Station In A Mining Enterprise In Gansu

In recent years,the antimony industry in China has developed rapidly,and the pollution of the waste water containing antimony is increasingly serious,but the existing water treatment technology is difficult to meet the needs of the treatment of antimony containing wastewater.Therefore,it is necessary to carry out the deep treatment based on the traditional water treatment technology in order to achieve the effect of the removal of antimony in the wastewater.In this study,the optimum treatment conditions were selected by chemical precipitation method and membrane separation method,and the engineering design of antimony containing wastewater treatment engineering was carried out by taking the antimony containing wastewater in a Gansu coal mine as the object.By analyzing the mechanism of coagulation sedimentation and the principle of removing antimony by SPFS,“Na₂S+SPFS+PAM"and"Ca?OH?₂+SPFS+PAM"were selected as chemical precipitating agents,and the optimal treatment strip was selected with PH,the dosage of merized SPFS and the initial concentration of Sb in water samples as experimental variables.The results show that the chemical precipitation method has better effect on the treatment of antimony containing wastewater with"Ca?OH?₂+SPFS+PAM"as adding agent,and when the amount of PH=9 and SPFS dosage is 1000mg/L.At the same time,it is found that adding certain air agitation in chemical precipitation can improve the removal efficiency of antimony.In order to further improve the removal rate of antimony,membrane separation was used to treat the chemical precipitation overflow water.The membrane separation test uses nanofiltration membrane and reverse osmosis membrane to treat the overflow water.The result shows that the pure use of nanofiltration membrane can not make the water reach the requirement of<0.005mg/L,but only the reverse osmosis membrane is used to intercept most of the non polluting molecules and ions on the surface of the membrane while the antimony ion is intercepted,causing the reverse osmosis.The excessive membrane fouling and the increase of operation cost can make the membrane separation link achieve the best economic and practical results by using the combination membrane of nanofiltration and reverse osmosis.The concentration of antimony containing water in the reverse osmosis membrane is 50%,60%and 80%,the concentration of antimony containing water is0.002mg/L,but the conductivity of the concentrated water increases,indicating the increase of the salt substance in the concentrated water.Therefore,the film separation degree of 50%is finally determined as the design membrane separation degree of the reverse osmosis membrane.The purpose is to improve the removal of antimony.At the same time,the membrane fouling of reverse osmosis membrane can also be reduced.Taking the antimony containing wastewater in a mining enterprise in Gansu as the object,based on the test results,the water treatment design scheme of"first stage coagulation sedimentation+composite membrane separation+two stage coagulation sedimentation?concentrated phase water?"is formulated to improve the removal rate of antimony in wastewater and carry out engineering design research.The test results show that the effluent contains antimony pollution.The measured concentration is 0.003mg/L,which is slightly different from the experimental results?0.002mg/L?,but also less than the0.005mg/L standard,which meets the local environmental requirements.