| With the rapid development of economy, the pollution of sources water in ourcountry become more and more serious, heavy metals pollution has already be a veryoutstanding problem in water pollution. The concentration of the heavy metals in thenatural water is not high, however, due to human exploitation of heavy metals,smelting, processing and others activity increased, a lot of heavy metals went into theatmosphere,water and soil environment,causing serious environmental pollution.Heavy metal pollution of the water often are not just a single heavy metal in the water,but happened with varieties of others heavy metals.These compounded pollution isfrom wastewater which without untreated or with treatment could not meet thestandard,causing sudden pollution of raw water,brings great hazard to human healthand direct damage to the production. so find an emergency treatment of sudden heavymetals compound pollution in drinking water source has important actually workimportan significance for world.so find an emergency treatment of sudden heavymetals compound pollution in water source has important significance for us.In this thesis,taking the sudden compound pollution of heavy metals copper+cadmium+thallium and antimony+thallium in drinking water source as theresearching object. Meanwhile, the removal efficiency of heavy metals by enhancedconventional water treatment process was studied. The main conelusions and resultwere listed as follows:（1） To research the removal efficiency of sole Cu,Cd, Sb,Tl pollution by byconventional water treatment process was studied. The result shows that: the removalefficiency of Cu,Cd, Sb and Tl are badly just by conventional coagulation processwith PAFC as coagulant,but Sb can be effectively removed through conventionalcoagulation process with PFC as coagulant.Adjusting the pH can increase theremoval rate of heavy metals effevtively, but the removal effect of Tl is still low.（2） The feasibility of removal capability of Cu,Cd,Tl by combined use ofpotassium ferrate and powdered activated carbon was investigated in this study. Theresult shows that:the dosage of potassium ferrated and the pH of raw water are most critical influences on the removal effect of heavy metals; Single factor analysis andorthogonal test determine the optimal dosage of K2FeO4, power activated carbon andpoly aluminum ferric chloride （PAFC） were1.00mg/L,0mg/L and1.5mg/L, theoptimal pH was adjusted to9.00.Under these conditions, the raw water with4.84mg/LCu,14.00ug/L Cd and0.325μg/LTl could be treated up to the national drinkingwater standards, with the residual concentration of Cu, Cd and Tl were lower than1mg/L,0.005mg/L and0.1ug/L.（3） To research the removal efficiency of antimony and thallium by segmentationprocess, The results showed that: Segmentation process could enhance the removalrate of antimony and thallium effectively;When the first paragraph of PFC investmentplus the amount is10.0mg/L, the second paragraph of potassium ferrate dosage is1.0mg/L, the second paragraph of PAFC dosage is2.0mg/L,the residual antimonyconcentration in the sedimentation effluent was2.17μg/L and residual thalliumconcentration in the sedimentation effluent was0.016ug/L and less than the standardsfor drinking water quality. |
